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64d329ee | 1 | /* sun4c.c: Doing in software what should be done in hardware. |
1da177e4 | 2 | * |
64d329ee | 3 | * Copyright (C) 1996 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) |
5 | * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au) | |
6 | * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org) | |
7 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | */ | |
9 | ||
10 | #define NR_TASK_BUCKETS 512 | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/bootmem.h> | |
16 | #include <linux/highmem.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/seq_file.h> | |
0912a5db | 19 | #include <linux/scatterlist.h> |
1da177e4 | 20 | |
1da177e4 LT |
21 | #include <asm/page.h> |
22 | #include <asm/pgalloc.h> | |
23 | #include <asm/pgtable.h> | |
24 | #include <asm/vaddrs.h> | |
25 | #include <asm/idprom.h> | |
26 | #include <asm/machines.h> | |
27 | #include <asm/memreg.h> | |
28 | #include <asm/processor.h> | |
29 | #include <asm/auxio.h> | |
30 | #include <asm/io.h> | |
31 | #include <asm/oplib.h> | |
32 | #include <asm/openprom.h> | |
33 | #include <asm/mmu_context.h> | |
1da177e4 LT |
34 | #include <asm/highmem.h> |
35 | #include <asm/btfixup.h> | |
36 | #include <asm/cacheflush.h> | |
37 | #include <asm/tlbflush.h> | |
38 | ||
39 | /* Because of our dynamic kernel TLB miss strategy, and how | |
40 | * our DVMA mapping allocation works, you _MUST_: | |
41 | * | |
42 | * 1) Disable interrupts _and_ not touch any dynamic kernel | |
43 | * memory while messing with kernel MMU state. By | |
44 | * dynamic memory I mean any object which is not in | |
45 | * the kernel image itself or a thread_union (both of | |
46 | * which are locked into the MMU). | |
47 | * 2) Disable interrupts while messing with user MMU state. | |
48 | */ | |
49 | ||
50 | extern int num_segmaps, num_contexts; | |
51 | ||
52 | extern unsigned long page_kernel; | |
53 | ||
1da177e4 LT |
54 | /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. |
55 | * So let's save some cycles and just use that everywhere except for that bootup | |
56 | * sanity check. | |
57 | */ | |
58 | #define SUN4C_VAC_SIZE 65536 | |
1da177e4 LT |
59 | |
60 | #define SUN4C_KERNEL_BUCKETS 32 | |
61 | ||
62 | /* Flushing the cache. */ | |
63 | struct sun4c_vac_props sun4c_vacinfo; | |
64 | unsigned long sun4c_kernel_faults; | |
65 | ||
66 | /* Invalidate every sun4c cache line tag. */ | |
67 | static void __init sun4c_flush_all(void) | |
68 | { | |
69 | unsigned long begin, end; | |
70 | ||
71 | if (sun4c_vacinfo.on) | |
72 | panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); | |
73 | ||
74 | /* Clear 'valid' bit in all cache line tags */ | |
75 | begin = AC_CACHETAGS; | |
76 | end = (AC_CACHETAGS + SUN4C_VAC_SIZE); | |
77 | while (begin < end) { | |
78 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
79 | "r" (begin), "i" (ASI_CONTROL)); | |
80 | begin += sun4c_vacinfo.linesize; | |
81 | } | |
82 | } | |
83 | ||
84 | static void sun4c_flush_context_hw(void) | |
85 | { | |
86 | unsigned long end = SUN4C_VAC_SIZE; | |
87 | ||
88 | __asm__ __volatile__( | |
89 | "1: addcc %0, -4096, %0\n\t" | |
90 | " bne 1b\n\t" | |
91 | " sta %%g0, [%0] %2" | |
92 | : "=&r" (end) | |
93 | : "0" (end), "i" (ASI_HWFLUSHCONTEXT) | |
94 | : "cc"); | |
95 | } | |
96 | ||
97 | /* Must be called minimally with IRQs disabled. */ | |
98 | static void sun4c_flush_segment_hw(unsigned long addr) | |
99 | { | |
100 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
101 | unsigned long vac_size = SUN4C_VAC_SIZE; | |
102 | ||
103 | __asm__ __volatile__( | |
104 | "1: addcc %0, -4096, %0\n\t" | |
105 | " bne 1b\n\t" | |
106 | " sta %%g0, [%2 + %0] %3" | |
107 | : "=&r" (vac_size) | |
108 | : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) | |
109 | : "cc"); | |
110 | } | |
111 | } | |
112 | ||
113 | /* File local boot time fixups. */ | |
114 | BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) | |
115 | BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) | |
116 | BTFIXUPDEF_CALL(void, sun4c_flush_context, void) | |
117 | ||
118 | #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) | |
119 | #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) | |
120 | #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() | |
121 | ||
122 | /* Must be called minimally with interrupts disabled. */ | |
123 | static void sun4c_flush_page_hw(unsigned long addr) | |
124 | { | |
125 | addr &= PAGE_MASK; | |
126 | if ((int)sun4c_get_pte(addr) < 0) | |
127 | __asm__ __volatile__("sta %%g0, [%0] %1" | |
128 | : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); | |
129 | } | |
130 | ||
131 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
132 | static void sun4c_flush_context_sw(void) | |
133 | { | |
134 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
135 | unsigned long lsize = sun4c_vacinfo.linesize; | |
136 | ||
137 | __asm__ __volatile__( | |
138 | "add %2, %2, %%g1\n\t" | |
139 | "add %2, %%g1, %%g2\n\t" | |
140 | "add %2, %%g2, %%g3\n\t" | |
141 | "add %2, %%g3, %%g4\n\t" | |
142 | "add %2, %%g4, %%g5\n\t" | |
143 | "add %2, %%g5, %%o4\n\t" | |
144 | "add %2, %%o4, %%o5\n" | |
145 | "1:\n\t" | |
146 | "subcc %0, %%o5, %0\n\t" | |
147 | "sta %%g0, [%0] %3\n\t" | |
148 | "sta %%g0, [%0 + %2] %3\n\t" | |
149 | "sta %%g0, [%0 + %%g1] %3\n\t" | |
150 | "sta %%g0, [%0 + %%g2] %3\n\t" | |
151 | "sta %%g0, [%0 + %%g3] %3\n\t" | |
152 | "sta %%g0, [%0 + %%g4] %3\n\t" | |
153 | "sta %%g0, [%0 + %%g5] %3\n\t" | |
154 | "bg 1b\n\t" | |
155 | " sta %%g0, [%1 + %%o4] %3\n" | |
156 | : "=&r" (nbytes) | |
157 | : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) | |
158 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
159 | } | |
160 | ||
161 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
162 | static void sun4c_flush_segment_sw(unsigned long addr) | |
163 | { | |
164 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
165 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
166 | unsigned long lsize = sun4c_vacinfo.linesize; | |
167 | ||
168 | __asm__ __volatile__( | |
169 | "add %2, %2, %%g1\n\t" | |
170 | "add %2, %%g1, %%g2\n\t" | |
171 | "add %2, %%g2, %%g3\n\t" | |
172 | "add %2, %%g3, %%g4\n\t" | |
173 | "add %2, %%g4, %%g5\n\t" | |
174 | "add %2, %%g5, %%o4\n\t" | |
175 | "add %2, %%o4, %%o5\n" | |
176 | "1:\n\t" | |
177 | "subcc %1, %%o5, %1\n\t" | |
178 | "sta %%g0, [%0] %6\n\t" | |
179 | "sta %%g0, [%0 + %2] %6\n\t" | |
180 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
181 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
182 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
183 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
184 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
185 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
186 | "bg 1b\n\t" | |
187 | " add %0, %%o5, %0\n" | |
188 | : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) | |
189 | : "0" (addr), "1" (nbytes), "2" (lsize), | |
190 | "i" (ASI_FLUSHSEG) | |
191 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
192 | } | |
193 | } | |
194 | ||
195 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
196 | static void sun4c_flush_page_sw(unsigned long addr) | |
197 | { | |
198 | addr &= PAGE_MASK; | |
199 | if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == | |
200 | _SUN4C_PAGE_VALID) { | |
201 | unsigned long left = PAGE_SIZE; | |
202 | unsigned long lsize = sun4c_vacinfo.linesize; | |
203 | ||
204 | __asm__ __volatile__( | |
205 | "add %2, %2, %%g1\n\t" | |
206 | "add %2, %%g1, %%g2\n\t" | |
207 | "add %2, %%g2, %%g3\n\t" | |
208 | "add %2, %%g3, %%g4\n\t" | |
209 | "add %2, %%g4, %%g5\n\t" | |
210 | "add %2, %%g5, %%o4\n\t" | |
211 | "add %2, %%o4, %%o5\n" | |
212 | "1:\n\t" | |
213 | "subcc %1, %%o5, %1\n\t" | |
214 | "sta %%g0, [%0] %6\n\t" | |
215 | "sta %%g0, [%0 + %2] %6\n\t" | |
216 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
217 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
218 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
219 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
220 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
221 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
222 | "bg 1b\n\t" | |
223 | " add %0, %%o5, %0\n" | |
224 | : "=&r" (addr), "=&r" (left), "=&r" (lsize) | |
225 | : "0" (addr), "1" (left), "2" (lsize), | |
226 | "i" (ASI_FLUSHPG) | |
227 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
228 | } | |
229 | } | |
230 | ||
231 | /* The sun4c's do have an on chip store buffer. And the way you | |
232 | * clear them out isn't so obvious. The only way I can think of | |
233 | * to accomplish this is to read the current context register, | |
234 | * store the same value there, then read an external hardware | |
235 | * register. | |
236 | */ | |
237 | void sun4c_complete_all_stores(void) | |
238 | { | |
239 | volatile int _unused; | |
240 | ||
241 | _unused = sun4c_get_context(); | |
242 | sun4c_set_context(_unused); | |
243 | #ifdef CONFIG_SUN_AUXIO | |
244 | _unused = get_auxio(); | |
245 | #endif | |
246 | } | |
247 | ||
248 | /* Bootup utility functions. */ | |
249 | static inline void sun4c_init_clean_segmap(unsigned char pseg) | |
250 | { | |
251 | unsigned long vaddr; | |
252 | ||
253 | sun4c_put_segmap(0, pseg); | |
254 | for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) | |
255 | sun4c_put_pte(vaddr, 0); | |
256 | sun4c_put_segmap(0, invalid_segment); | |
257 | } | |
258 | ||
259 | static inline void sun4c_init_clean_mmu(unsigned long kernel_end) | |
260 | { | |
261 | unsigned long vaddr; | |
262 | unsigned char savectx, ctx; | |
263 | ||
264 | savectx = sun4c_get_context(); | |
1da177e4 LT |
265 | for (ctx = 0; ctx < num_contexts; ctx++) { |
266 | sun4c_set_context(ctx); | |
267 | for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
268 | sun4c_put_segmap(vaddr, invalid_segment); | |
269 | for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
270 | sun4c_put_segmap(vaddr, invalid_segment); | |
271 | for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
272 | sun4c_put_segmap(vaddr, invalid_segment); | |
273 | for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
274 | sun4c_put_segmap(vaddr, invalid_segment); | |
275 | } | |
276 | sun4c_set_context(savectx); | |
277 | } | |
278 | ||
279 | void __init sun4c_probe_vac(void) | |
280 | { | |
281 | sun4c_disable_vac(); | |
282 | ||
5110bd21 AB |
283 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
284 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
285 | /* PROM on SS1 lacks this info, to be super safe we | |
286 | * hard code it here since this arch is cast in stone. | |
287 | */ | |
288 | sun4c_vacinfo.num_bytes = 65536; | |
289 | sun4c_vacinfo.linesize = 16; | |
1da177e4 | 290 | } else { |
5110bd21 AB |
291 | sun4c_vacinfo.num_bytes = |
292 | prom_getintdefault(prom_root_node, "vac-size", 65536); | |
293 | sun4c_vacinfo.linesize = | |
294 | prom_getintdefault(prom_root_node, "vac-linesize", 16); | |
295 | } | |
296 | sun4c_vacinfo.do_hwflushes = | |
297 | prom_getintdefault(prom_root_node, "vac-hwflush", 0); | |
1da177e4 | 298 | |
5110bd21 AB |
299 | if (sun4c_vacinfo.do_hwflushes == 0) |
300 | sun4c_vacinfo.do_hwflushes = | |
301 | prom_getintdefault(prom_root_node, "vac_hwflush", 0); | |
1da177e4 | 302 | |
5110bd21 AB |
303 | if (sun4c_vacinfo.num_bytes != 65536) { |
304 | prom_printf("WEIRD Sun4C VAC cache size, " | |
305 | "tell sparclinux@vger.kernel.org"); | |
306 | prom_halt(); | |
1da177e4 LT |
307 | } |
308 | ||
1da177e4 LT |
309 | switch (sun4c_vacinfo.linesize) { |
310 | case 16: | |
311 | sun4c_vacinfo.log2lsize = 4; | |
312 | break; | |
313 | case 32: | |
314 | sun4c_vacinfo.log2lsize = 5; | |
315 | break; | |
316 | default: | |
317 | prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", | |
318 | sun4c_vacinfo.linesize); | |
319 | prom_halt(); | |
320 | }; | |
321 | ||
322 | sun4c_flush_all(); | |
323 | sun4c_enable_vac(); | |
324 | } | |
325 | ||
326 | /* Patch instructions for the low level kernel fault handler. */ | |
327 | extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; | |
328 | extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; | |
329 | extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; | |
330 | extern unsigned long num_context_patch1, num_context_patch1_16; | |
331 | extern unsigned long num_context_patch2_16; | |
332 | extern unsigned long vac_linesize_patch, vac_linesize_patch_32; | |
333 | extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; | |
334 | extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; | |
335 | ||
336 | #define PATCH_INSN(src, dst) do { \ | |
337 | daddr = &(dst); \ | |
338 | iaddr = &(src); \ | |
339 | *daddr = *iaddr; \ | |
340 | } while (0) | |
341 | ||
342 | static void __init patch_kernel_fault_handler(void) | |
343 | { | |
344 | unsigned long *iaddr, *daddr; | |
345 | ||
346 | switch (num_segmaps) { | |
347 | case 128: | |
348 | /* Default, nothing to do. */ | |
349 | break; | |
350 | case 256: | |
351 | PATCH_INSN(invalid_segment_patch1_ff, | |
352 | invalid_segment_patch1); | |
353 | PATCH_INSN(invalid_segment_patch2_ff, | |
354 | invalid_segment_patch2); | |
355 | break; | |
356 | case 512: | |
357 | PATCH_INSN(invalid_segment_patch1_1ff, | |
358 | invalid_segment_patch1); | |
359 | PATCH_INSN(invalid_segment_patch2_1ff, | |
360 | invalid_segment_patch2); | |
361 | break; | |
362 | default: | |
363 | prom_printf("Unhandled number of segmaps: %d\n", | |
364 | num_segmaps); | |
365 | prom_halt(); | |
366 | }; | |
367 | switch (num_contexts) { | |
368 | case 8: | |
369 | /* Default, nothing to do. */ | |
370 | break; | |
371 | case 16: | |
372 | PATCH_INSN(num_context_patch1_16, | |
373 | num_context_patch1); | |
374 | break; | |
375 | default: | |
376 | prom_printf("Unhandled number of contexts: %d\n", | |
377 | num_contexts); | |
378 | prom_halt(); | |
379 | }; | |
380 | ||
381 | if (sun4c_vacinfo.do_hwflushes != 0) { | |
382 | PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); | |
383 | PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); | |
384 | } else { | |
385 | switch (sun4c_vacinfo.linesize) { | |
386 | case 16: | |
387 | /* Default, nothing to do. */ | |
388 | break; | |
389 | case 32: | |
390 | PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); | |
391 | break; | |
392 | default: | |
393 | prom_printf("Impossible VAC linesize %d, halting...\n", | |
394 | sun4c_vacinfo.linesize); | |
395 | prom_halt(); | |
396 | }; | |
397 | } | |
398 | } | |
399 | ||
400 | static void __init sun4c_probe_mmu(void) | |
401 | { | |
5110bd21 AB |
402 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
403 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
404 | /* Hardcode these just to be safe, PROM on SS1 does | |
405 | * not have this info available in the root node. | |
406 | */ | |
407 | num_segmaps = 128; | |
408 | num_contexts = 8; | |
1da177e4 | 409 | } else { |
5110bd21 AB |
410 | num_segmaps = |
411 | prom_getintdefault(prom_root_node, "mmu-npmg", 128); | |
412 | num_contexts = | |
413 | prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); | |
1da177e4 LT |
414 | } |
415 | patch_kernel_fault_handler(); | |
416 | } | |
417 | ||
a3297296 | 418 | volatile unsigned long __iomem *sun4c_memerr_reg = NULL; |
1da177e4 LT |
419 | |
420 | void __init sun4c_probe_memerr_reg(void) | |
421 | { | |
422 | int node; | |
423 | struct linux_prom_registers regs[1]; | |
424 | ||
5110bd21 AB |
425 | node = prom_getchild(prom_root_node); |
426 | node = prom_searchsiblings(prom_root_node, "memory-error"); | |
427 | if (!node) | |
428 | return; | |
429 | if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) | |
430 | return; | |
431 | /* hmm I think regs[0].which_io is zero here anyways */ | |
432 | sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); | |
1da177e4 LT |
433 | } |
434 | ||
435 | static inline void sun4c_init_ss2_cache_bug(void) | |
436 | { | |
437 | extern unsigned long start; | |
438 | ||
439 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || | |
440 | (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || | |
1da177e4 LT |
441 | (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { |
442 | /* Whee.. */ | |
443 | printk("SS2 cache bug detected, uncaching trap table page\n"); | |
444 | sun4c_flush_page((unsigned int) &start); | |
445 | sun4c_put_pte(((unsigned long) &start), | |
446 | (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE)); | |
447 | } | |
448 | } | |
449 | ||
450 | /* Addr is always aligned on a page boundary for us already. */ | |
4b1c5df2 DM |
451 | static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, |
452 | unsigned long addr, int len) | |
1da177e4 LT |
453 | { |
454 | unsigned long page, end; | |
455 | ||
456 | *pba = addr; | |
457 | ||
458 | end = PAGE_ALIGN((addr + len)); | |
459 | while (addr < end) { | |
460 | page = va; | |
461 | sun4c_flush_page(page); | |
462 | page -= PAGE_OFFSET; | |
463 | page >>= PAGE_SHIFT; | |
464 | page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | | |
465 | _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); | |
466 | sun4c_put_pte(addr, page); | |
467 | addr += PAGE_SIZE; | |
468 | va += PAGE_SIZE; | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
4b1c5df2 | 474 | static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len) |
1da177e4 LT |
475 | { |
476 | /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ | |
477 | /* XXX Implement this */ | |
478 | } | |
479 | ||
480 | /* TLB management. */ | |
481 | ||
482 | /* Don't change this struct without changing entry.S. This is used | |
483 | * in the in-window kernel fault handler, and you don't want to mess | |
484 | * with that. (See sun4c_fault in entry.S). | |
485 | */ | |
486 | struct sun4c_mmu_entry { | |
487 | struct sun4c_mmu_entry *next; | |
488 | struct sun4c_mmu_entry *prev; | |
489 | unsigned long vaddr; | |
490 | unsigned char pseg; | |
491 | unsigned char locked; | |
492 | ||
493 | /* For user mappings only, and completely hidden from kernel | |
494 | * TLB miss code. | |
495 | */ | |
496 | unsigned char ctx; | |
497 | struct sun4c_mmu_entry *lru_next; | |
498 | struct sun4c_mmu_entry *lru_prev; | |
499 | }; | |
500 | ||
501 | static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; | |
502 | ||
503 | static void __init sun4c_init_mmu_entry_pool(void) | |
504 | { | |
505 | int i; | |
506 | ||
507 | for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { | |
508 | mmu_entry_pool[i].pseg = i; | |
509 | mmu_entry_pool[i].next = NULL; | |
510 | mmu_entry_pool[i].prev = NULL; | |
511 | mmu_entry_pool[i].vaddr = 0; | |
512 | mmu_entry_pool[i].locked = 0; | |
513 | mmu_entry_pool[i].ctx = 0; | |
514 | mmu_entry_pool[i].lru_next = NULL; | |
515 | mmu_entry_pool[i].lru_prev = NULL; | |
516 | } | |
517 | mmu_entry_pool[invalid_segment].locked = 1; | |
518 | } | |
519 | ||
520 | static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, | |
521 | unsigned long bits_off) | |
522 | { | |
523 | unsigned long start, end; | |
524 | ||
525 | end = vaddr + SUN4C_REAL_PGDIR_SIZE; | |
526 | for (start = vaddr; start < end; start += PAGE_SIZE) | |
527 | if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) | |
528 | sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & | |
529 | ~bits_off); | |
530 | } | |
531 | ||
532 | static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) | |
533 | { | |
534 | unsigned long vaddr; | |
535 | unsigned char pseg, ctx; | |
5110bd21 | 536 | |
1da177e4 LT |
537 | for (vaddr = KADB_DEBUGGER_BEGVM; |
538 | vaddr < LINUX_OPPROM_ENDVM; | |
539 | vaddr += SUN4C_REAL_PGDIR_SIZE) { | |
540 | pseg = sun4c_get_segmap(vaddr); | |
541 | if (pseg != invalid_segment) { | |
542 | mmu_entry_pool[pseg].locked = 1; | |
543 | for (ctx = 0; ctx < num_contexts; ctx++) | |
544 | prom_putsegment(ctx, vaddr, pseg); | |
545 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); | |
546 | } | |
547 | } | |
5110bd21 | 548 | |
1da177e4 LT |
549 | for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { |
550 | pseg = sun4c_get_segmap(vaddr); | |
551 | mmu_entry_pool[pseg].locked = 1; | |
552 | for (ctx = 0; ctx < num_contexts; ctx++) | |
553 | prom_putsegment(ctx, vaddr, pseg); | |
554 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); | |
555 | } | |
556 | } | |
557 | ||
558 | static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) | |
559 | { | |
560 | int i, ctx; | |
561 | ||
562 | while (start < end) { | |
563 | for (i = 0; i < invalid_segment; i++) | |
564 | if (!mmu_entry_pool[i].locked) | |
565 | break; | |
566 | mmu_entry_pool[i].locked = 1; | |
567 | sun4c_init_clean_segmap(i); | |
568 | for (ctx = 0; ctx < num_contexts; ctx++) | |
569 | prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); | |
570 | start += SUN4C_REAL_PGDIR_SIZE; | |
571 | } | |
572 | } | |
573 | ||
574 | /* Don't change this struct without changing entry.S. This is used | |
575 | * in the in-window kernel fault handler, and you don't want to mess | |
576 | * with that. (See sun4c_fault in entry.S). | |
577 | */ | |
578 | struct sun4c_mmu_ring { | |
579 | struct sun4c_mmu_entry ringhd; | |
580 | int num_entries; | |
581 | }; | |
582 | ||
583 | static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ | |
584 | static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ | |
585 | static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ | |
586 | struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ | |
587 | struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ | |
588 | ||
589 | static inline void sun4c_init_rings(void) | |
590 | { | |
591 | int i; | |
592 | ||
593 | for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { | |
594 | sun4c_context_ring[i].ringhd.next = | |
595 | sun4c_context_ring[i].ringhd.prev = | |
596 | &sun4c_context_ring[i].ringhd; | |
597 | sun4c_context_ring[i].num_entries = 0; | |
598 | } | |
599 | sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = | |
600 | &sun4c_ufree_ring.ringhd; | |
601 | sun4c_ufree_ring.num_entries = 0; | |
602 | sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = | |
603 | &sun4c_ulru_ring.ringhd; | |
604 | sun4c_ulru_ring.num_entries = 0; | |
605 | sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = | |
606 | &sun4c_kernel_ring.ringhd; | |
607 | sun4c_kernel_ring.num_entries = 0; | |
608 | sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = | |
609 | &sun4c_kfree_ring.ringhd; | |
610 | sun4c_kfree_ring.num_entries = 0; | |
611 | } | |
612 | ||
613 | static void add_ring(struct sun4c_mmu_ring *ring, | |
614 | struct sun4c_mmu_entry *entry) | |
615 | { | |
616 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
617 | ||
618 | entry->prev = head; | |
619 | (entry->next = head->next)->prev = entry; | |
620 | head->next = entry; | |
621 | ring->num_entries++; | |
622 | } | |
623 | ||
64d329ee | 624 | static inline void add_lru(struct sun4c_mmu_entry *entry) |
1da177e4 LT |
625 | { |
626 | struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; | |
627 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
628 | ||
629 | entry->lru_next = head; | |
630 | (entry->lru_prev = head->lru_prev)->lru_next = entry; | |
631 | head->lru_prev = entry; | |
632 | } | |
633 | ||
634 | static void add_ring_ordered(struct sun4c_mmu_ring *ring, | |
635 | struct sun4c_mmu_entry *entry) | |
636 | { | |
637 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
638 | unsigned long addr = entry->vaddr; | |
639 | ||
640 | while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) | |
641 | head = head->next; | |
642 | ||
643 | entry->prev = head; | |
644 | (entry->next = head->next)->prev = entry; | |
645 | head->next = entry; | |
646 | ring->num_entries++; | |
647 | ||
648 | add_lru(entry); | |
649 | } | |
650 | ||
64d329ee | 651 | static inline void remove_ring(struct sun4c_mmu_ring *ring, |
1da177e4 LT |
652 | struct sun4c_mmu_entry *entry) |
653 | { | |
654 | struct sun4c_mmu_entry *next = entry->next; | |
655 | ||
656 | (next->prev = entry->prev)->next = next; | |
657 | ring->num_entries--; | |
658 | } | |
659 | ||
660 | static void remove_lru(struct sun4c_mmu_entry *entry) | |
661 | { | |
662 | struct sun4c_mmu_entry *next = entry->lru_next; | |
663 | ||
664 | (next->lru_prev = entry->lru_prev)->lru_next = next; | |
665 | } | |
666 | ||
667 | static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) | |
668 | { | |
669 | remove_ring(sun4c_context_ring+ctx, entry); | |
670 | remove_lru(entry); | |
671 | add_ring(&sun4c_ufree_ring, entry); | |
672 | } | |
673 | ||
674 | static void free_kernel_entry(struct sun4c_mmu_entry *entry, | |
675 | struct sun4c_mmu_ring *ring) | |
676 | { | |
677 | remove_ring(ring, entry); | |
678 | add_ring(&sun4c_kfree_ring, entry); | |
679 | } | |
680 | ||
681 | static void __init sun4c_init_fill_kernel_ring(int howmany) | |
682 | { | |
683 | int i; | |
684 | ||
685 | while (howmany) { | |
686 | for (i = 0; i < invalid_segment; i++) | |
687 | if (!mmu_entry_pool[i].locked) | |
688 | break; | |
689 | mmu_entry_pool[i].locked = 1; | |
690 | sun4c_init_clean_segmap(i); | |
691 | add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); | |
692 | howmany--; | |
693 | } | |
694 | } | |
695 | ||
696 | static void __init sun4c_init_fill_user_ring(void) | |
697 | { | |
698 | int i; | |
699 | ||
700 | for (i = 0; i < invalid_segment; i++) { | |
701 | if (mmu_entry_pool[i].locked) | |
702 | continue; | |
703 | sun4c_init_clean_segmap(i); | |
704 | add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); | |
705 | } | |
706 | } | |
707 | ||
708 | static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) | |
709 | { | |
710 | int savectx, ctx; | |
711 | ||
712 | savectx = sun4c_get_context(); | |
713 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
714 | sun4c_set_context(ctx); | |
715 | sun4c_put_segmap(kentry->vaddr, invalid_segment); | |
716 | } | |
717 | sun4c_set_context(savectx); | |
718 | } | |
719 | ||
720 | static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) | |
721 | { | |
722 | int savectx, ctx; | |
723 | ||
724 | savectx = sun4c_get_context(); | |
725 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
726 | sun4c_set_context(ctx); | |
727 | sun4c_put_segmap(kentry->vaddr, kentry->pseg); | |
728 | } | |
729 | sun4c_set_context(savectx); | |
730 | } | |
731 | ||
732 | #define sun4c_user_unmap(__entry) \ | |
733 | sun4c_put_segmap((__entry)->vaddr, invalid_segment) | |
734 | ||
735 | static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) | |
736 | { | |
737 | struct sun4c_mmu_entry *head = &crp->ringhd; | |
738 | unsigned long flags; | |
739 | ||
740 | local_irq_save(flags); | |
741 | if (head->next != head) { | |
742 | struct sun4c_mmu_entry *entry = head->next; | |
743 | int savectx = sun4c_get_context(); | |
744 | ||
745 | flush_user_windows(); | |
746 | sun4c_set_context(ctx); | |
747 | sun4c_flush_context(); | |
748 | do { | |
749 | struct sun4c_mmu_entry *next = entry->next; | |
750 | ||
751 | sun4c_user_unmap(entry); | |
752 | free_user_entry(ctx, entry); | |
753 | ||
754 | entry = next; | |
755 | } while (entry != head); | |
756 | sun4c_set_context(savectx); | |
757 | } | |
758 | local_irq_restore(flags); | |
759 | } | |
760 | ||
761 | static int sun4c_user_taken_entries; /* This is how much we have. */ | |
762 | static int max_user_taken_entries; /* This limits us and prevents deadlock. */ | |
763 | ||
764 | static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) | |
765 | { | |
766 | struct sun4c_mmu_entry *this_entry; | |
767 | ||
768 | /* If some are free, return first one. */ | |
769 | if (sun4c_kfree_ring.num_entries) { | |
770 | this_entry = sun4c_kfree_ring.ringhd.next; | |
771 | return this_entry; | |
772 | } | |
773 | ||
774 | /* Else free one up. */ | |
775 | this_entry = sun4c_kernel_ring.ringhd.prev; | |
776 | sun4c_flush_segment(this_entry->vaddr); | |
777 | sun4c_kernel_unmap(this_entry); | |
778 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
779 | this_entry = sun4c_kfree_ring.ringhd.next; | |
780 | ||
781 | return this_entry; | |
782 | } | |
783 | ||
784 | /* Using this method to free up mmu entries eliminates a lot of | |
785 | * potential races since we have a kernel that incurs tlb | |
786 | * replacement faults. There may be performance penalties. | |
787 | * | |
788 | * NOTE: Must be called with interrupts disabled. | |
789 | */ | |
790 | static struct sun4c_mmu_entry *sun4c_user_strategy(void) | |
791 | { | |
792 | struct sun4c_mmu_entry *entry; | |
793 | unsigned char ctx; | |
794 | int savectx; | |
795 | ||
796 | /* If some are free, return first one. */ | |
797 | if (sun4c_ufree_ring.num_entries) { | |
798 | entry = sun4c_ufree_ring.ringhd.next; | |
799 | goto unlink_out; | |
800 | } | |
801 | ||
802 | if (sun4c_user_taken_entries) { | |
803 | entry = sun4c_kernel_strategy(); | |
804 | sun4c_user_taken_entries--; | |
805 | goto kunlink_out; | |
806 | } | |
807 | ||
808 | /* Grab from the beginning of the LRU list. */ | |
809 | entry = sun4c_ulru_ring.ringhd.lru_next; | |
810 | ctx = entry->ctx; | |
811 | ||
812 | savectx = sun4c_get_context(); | |
813 | flush_user_windows(); | |
814 | sun4c_set_context(ctx); | |
815 | sun4c_flush_segment(entry->vaddr); | |
816 | sun4c_user_unmap(entry); | |
817 | remove_ring(sun4c_context_ring + ctx, entry); | |
818 | remove_lru(entry); | |
819 | sun4c_set_context(savectx); | |
820 | ||
821 | return entry; | |
822 | ||
823 | unlink_out: | |
824 | remove_ring(&sun4c_ufree_ring, entry); | |
825 | return entry; | |
826 | kunlink_out: | |
827 | remove_ring(&sun4c_kfree_ring, entry); | |
828 | return entry; | |
829 | } | |
830 | ||
831 | /* NOTE: Must be called with interrupts disabled. */ | |
832 | void sun4c_grow_kernel_ring(void) | |
833 | { | |
834 | struct sun4c_mmu_entry *entry; | |
835 | ||
836 | /* Prevent deadlock condition. */ | |
837 | if (sun4c_user_taken_entries >= max_user_taken_entries) | |
838 | return; | |
839 | ||
840 | if (sun4c_ufree_ring.num_entries) { | |
841 | entry = sun4c_ufree_ring.ringhd.next; | |
842 | remove_ring(&sun4c_ufree_ring, entry); | |
843 | add_ring(&sun4c_kfree_ring, entry); | |
844 | sun4c_user_taken_entries++; | |
845 | } | |
846 | } | |
847 | ||
848 | /* 2 page buckets for task struct and kernel stack allocation. | |
849 | * | |
850 | * TASK_STACK_BEGIN | |
851 | * bucket[0] | |
852 | * bucket[1] | |
853 | * [ ... ] | |
854 | * bucket[NR_TASK_BUCKETS-1] | |
855 | * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) | |
856 | * | |
857 | * Each slot looks like: | |
858 | * | |
859 | * page 1 -- task struct + beginning of kernel stack | |
860 | * page 2 -- rest of kernel stack | |
861 | */ | |
862 | ||
863 | union task_union *sun4c_bucket[NR_TASK_BUCKETS]; | |
864 | ||
865 | static int sun4c_lowbucket_avail; | |
866 | ||
867 | #define BUCKET_EMPTY ((union task_union *) 0) | |
868 | #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ | |
869 | #define BUCKET_SIZE (1 << BUCKET_SHIFT) | |
870 | #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) | |
871 | #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) | |
872 | #define BUCKET_PTE(page) \ | |
873 | ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) | |
874 | #define BUCKET_PTE_PAGE(pte) \ | |
875 | (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) | |
876 | ||
877 | static void get_locked_segment(unsigned long addr) | |
878 | { | |
879 | struct sun4c_mmu_entry *stolen; | |
880 | unsigned long flags; | |
881 | ||
882 | local_irq_save(flags); | |
883 | addr &= SUN4C_REAL_PGDIR_MASK; | |
884 | stolen = sun4c_user_strategy(); | |
885 | max_user_taken_entries--; | |
886 | stolen->vaddr = addr; | |
887 | flush_user_windows(); | |
888 | sun4c_kernel_map(stolen); | |
889 | local_irq_restore(flags); | |
890 | } | |
891 | ||
892 | static void free_locked_segment(unsigned long addr) | |
893 | { | |
894 | struct sun4c_mmu_entry *entry; | |
895 | unsigned long flags; | |
896 | unsigned char pseg; | |
897 | ||
898 | local_irq_save(flags); | |
899 | addr &= SUN4C_REAL_PGDIR_MASK; | |
900 | pseg = sun4c_get_segmap(addr); | |
901 | entry = &mmu_entry_pool[pseg]; | |
902 | ||
903 | flush_user_windows(); | |
904 | sun4c_flush_segment(addr); | |
905 | sun4c_kernel_unmap(entry); | |
906 | add_ring(&sun4c_ufree_ring, entry); | |
907 | max_user_taken_entries++; | |
908 | local_irq_restore(flags); | |
909 | } | |
910 | ||
911 | static inline void garbage_collect(int entry) | |
912 | { | |
913 | int start, end; | |
914 | ||
915 | /* 32 buckets per segment... */ | |
916 | entry &= ~31; | |
917 | start = entry; | |
918 | for (end = (start + 32); start < end; start++) | |
919 | if (sun4c_bucket[start] != BUCKET_EMPTY) | |
920 | return; | |
921 | ||
922 | /* Entire segment empty, release it. */ | |
923 | free_locked_segment(BUCKET_ADDR(entry)); | |
924 | } | |
925 | ||
926 | static struct thread_info *sun4c_alloc_thread_info(void) | |
927 | { | |
928 | unsigned long addr, pages; | |
929 | int entry; | |
930 | ||
931 | pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); | |
932 | if (!pages) | |
933 | return NULL; | |
934 | ||
935 | for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) | |
936 | if (sun4c_bucket[entry] == BUCKET_EMPTY) | |
937 | break; | |
938 | if (entry == NR_TASK_BUCKETS) { | |
939 | free_pages(pages, THREAD_INFO_ORDER); | |
940 | return NULL; | |
941 | } | |
942 | if (entry >= sun4c_lowbucket_avail) | |
943 | sun4c_lowbucket_avail = entry + 1; | |
944 | ||
945 | addr = BUCKET_ADDR(entry); | |
946 | sun4c_bucket[entry] = (union task_union *) addr; | |
947 | if(sun4c_get_segmap(addr) == invalid_segment) | |
948 | get_locked_segment(addr); | |
949 | ||
950 | /* We are changing the virtual color of the page(s) | |
951 | * so we must flush the cache to guarantee consistency. | |
952 | */ | |
953 | sun4c_flush_page(pages); | |
1da177e4 | 954 | sun4c_flush_page(pages + PAGE_SIZE); |
1da177e4 LT |
955 | |
956 | sun4c_put_pte(addr, BUCKET_PTE(pages)); | |
1da177e4 | 957 | sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); |
1da177e4 LT |
958 | |
959 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
960 | memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); | |
961 | #endif /* DEBUG_STACK_USAGE */ | |
962 | ||
963 | return (struct thread_info *) addr; | |
964 | } | |
965 | ||
966 | static void sun4c_free_thread_info(struct thread_info *ti) | |
967 | { | |
968 | unsigned long tiaddr = (unsigned long) ti; | |
969 | unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); | |
970 | int entry = BUCKET_NUM(tiaddr); | |
971 | ||
972 | /* We are deleting a mapping, so the flush here is mandatory. */ | |
973 | sun4c_flush_page(tiaddr); | |
1da177e4 | 974 | sun4c_flush_page(tiaddr + PAGE_SIZE); |
5110bd21 | 975 | |
1da177e4 | 976 | sun4c_put_pte(tiaddr, 0); |
1da177e4 | 977 | sun4c_put_pte(tiaddr + PAGE_SIZE, 0); |
5110bd21 | 978 | |
1da177e4 LT |
979 | sun4c_bucket[entry] = BUCKET_EMPTY; |
980 | if (entry < sun4c_lowbucket_avail) | |
981 | sun4c_lowbucket_avail = entry; | |
982 | ||
983 | free_pages(pages, THREAD_INFO_ORDER); | |
984 | garbage_collect(entry); | |
985 | } | |
986 | ||
987 | static void __init sun4c_init_buckets(void) | |
988 | { | |
989 | int entry; | |
990 | ||
991 | if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { | |
992 | extern void thread_info_size_is_bolixed_pete(void); | |
993 | thread_info_size_is_bolixed_pete(); | |
994 | } | |
995 | ||
996 | for (entry = 0; entry < NR_TASK_BUCKETS; entry++) | |
997 | sun4c_bucket[entry] = BUCKET_EMPTY; | |
998 | sun4c_lowbucket_avail = 0; | |
999 | } | |
1000 | ||
1001 | static unsigned long sun4c_iobuffer_start; | |
1002 | static unsigned long sun4c_iobuffer_end; | |
1003 | static unsigned long sun4c_iobuffer_high; | |
1004 | static unsigned long *sun4c_iobuffer_map; | |
1005 | static int iobuffer_map_size; | |
1006 | ||
1007 | /* | |
1008 | * Alias our pages so they do not cause a trap. | |
1009 | * Also one page may be aliased into several I/O areas and we may | |
1010 | * finish these I/O separately. | |
1011 | */ | |
1012 | static char *sun4c_lockarea(char *vaddr, unsigned long size) | |
1013 | { | |
1014 | unsigned long base, scan; | |
1015 | unsigned long npages; | |
1016 | unsigned long vpage; | |
1017 | unsigned long pte; | |
1018 | unsigned long apage; | |
1019 | unsigned long high; | |
1020 | unsigned long flags; | |
1021 | ||
1022 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1023 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1024 | ||
1025 | scan = 0; | |
1026 | local_irq_save(flags); | |
1027 | for (;;) { | |
1028 | scan = find_next_zero_bit(sun4c_iobuffer_map, | |
1029 | iobuffer_map_size, scan); | |
1030 | if ((base = scan) + npages > iobuffer_map_size) goto abend; | |
1031 | for (;;) { | |
1032 | if (scan >= base + npages) goto found; | |
1033 | if (test_bit(scan, sun4c_iobuffer_map)) break; | |
1034 | scan++; | |
1035 | } | |
1036 | } | |
1037 | ||
1038 | found: | |
1039 | high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1040 | high = SUN4C_REAL_PGDIR_ALIGN(high); | |
1041 | while (high > sun4c_iobuffer_high) { | |
1042 | get_locked_segment(sun4c_iobuffer_high); | |
1043 | sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; | |
1044 | } | |
1045 | ||
1046 | vpage = ((unsigned long) vaddr) & PAGE_MASK; | |
1047 | for (scan = base; scan < base+npages; scan++) { | |
1048 | pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); | |
1049 | pte |= pgprot_val(SUN4C_PAGE_KERNEL); | |
1050 | pte |= _SUN4C_PAGE_NOCACHE; | |
1051 | set_bit(scan, sun4c_iobuffer_map); | |
1052 | apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1053 | ||
1054 | /* Flush original mapping so we see the right things later. */ | |
1055 | sun4c_flush_page(vpage); | |
1056 | ||
1057 | sun4c_put_pte(apage, pte); | |
1058 | vpage += PAGE_SIZE; | |
1059 | } | |
1060 | local_irq_restore(flags); | |
1061 | return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + | |
1062 | (((unsigned long) vaddr) & ~PAGE_MASK)); | |
1063 | ||
1064 | abend: | |
1065 | local_irq_restore(flags); | |
1066 | printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); | |
1067 | panic("Out of iobuffer table"); | |
1068 | return NULL; | |
1069 | } | |
1070 | ||
1071 | static void sun4c_unlockarea(char *vaddr, unsigned long size) | |
1072 | { | |
1073 | unsigned long vpage, npages; | |
1074 | unsigned long flags; | |
1075 | int scan, high; | |
1076 | ||
1077 | vpage = (unsigned long)vaddr & PAGE_MASK; | |
1078 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1079 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1080 | ||
1081 | local_irq_save(flags); | |
1082 | while (npages != 0) { | |
1083 | --npages; | |
1084 | ||
1085 | /* This mapping is marked non-cachable, no flush necessary. */ | |
1086 | sun4c_put_pte(vpage, 0); | |
1087 | clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, | |
1088 | sun4c_iobuffer_map); | |
1089 | vpage += PAGE_SIZE; | |
1090 | } | |
1091 | ||
1092 | /* garbage collect */ | |
1093 | scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1094 | while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) | |
1095 | scan -= 32; | |
1096 | scan += 32; | |
1097 | high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); | |
1098 | high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; | |
1099 | while (high < sun4c_iobuffer_high) { | |
1100 | sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; | |
1101 | free_locked_segment(sun4c_iobuffer_high); | |
1102 | } | |
1103 | local_irq_restore(flags); | |
1104 | } | |
1105 | ||
1106 | /* Note the scsi code at init time passes to here buffers | |
1107 | * which sit on the kernel stack, those are already locked | |
1108 | * by implication and fool the page locking code above | |
1109 | * if passed to by mistake. | |
1110 | */ | |
1111 | static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus) | |
1112 | { | |
1113 | unsigned long page; | |
1114 | ||
1115 | page = ((unsigned long)bufptr) & PAGE_MASK; | |
1116 | if (!virt_addr_valid(page)) { | |
1117 | sun4c_flush_page(page); | |
1118 | return (__u32)bufptr; /* already locked */ | |
1119 | } | |
1120 | return (__u32)sun4c_lockarea(bufptr, len); | |
1121 | } | |
1122 | ||
1123 | static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
1124 | { | |
1125 | while (sz != 0) { | |
1126 | --sz; | |
58b053e4 | 1127 | sg->dvma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length); |
0912a5db JA |
1128 | sg->dvma_length = sg->length; |
1129 | sg = sg_next(sg); | |
1da177e4 LT |
1130 | } |
1131 | } | |
1132 | ||
1133 | static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus) | |
1134 | { | |
1135 | if (bufptr < sun4c_iobuffer_start) | |
1136 | return; /* On kernel stack or similar, see above */ | |
1137 | sun4c_unlockarea((char *)bufptr, len); | |
1138 | } | |
1139 | ||
1140 | static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus) | |
1141 | { | |
1142 | while (sz != 0) { | |
1143 | --sz; | |
0912a5db JA |
1144 | sun4c_unlockarea((char *)sg->dvma_address, sg->length); |
1145 | sg = sg_next(sg); | |
1da177e4 LT |
1146 | } |
1147 | } | |
1148 | ||
1149 | #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ | |
1150 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
1151 | ||
1152 | struct vm_area_struct sun4c_kstack_vma; | |
1153 | ||
1154 | static void __init sun4c_init_lock_areas(void) | |
1155 | { | |
1156 | unsigned long sun4c_taskstack_start; | |
1157 | unsigned long sun4c_taskstack_end; | |
1158 | int bitmap_size; | |
1159 | ||
1160 | sun4c_init_buckets(); | |
1161 | sun4c_taskstack_start = SUN4C_LOCK_VADDR; | |
1162 | sun4c_taskstack_end = (sun4c_taskstack_start + | |
1163 | (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); | |
1164 | if (sun4c_taskstack_end >= SUN4C_LOCK_END) { | |
1165 | prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); | |
1166 | prom_halt(); | |
1167 | } | |
1168 | ||
1169 | sun4c_iobuffer_start = sun4c_iobuffer_high = | |
1170 | SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); | |
1171 | sun4c_iobuffer_end = SUN4C_LOCK_END; | |
1172 | bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1173 | bitmap_size = (bitmap_size + 7) >> 3; | |
1174 | bitmap_size = LONG_ALIGN(bitmap_size); | |
1175 | iobuffer_map_size = bitmap_size << 3; | |
1176 | sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); | |
1177 | memset((void *) sun4c_iobuffer_map, 0, bitmap_size); | |
1178 | ||
1179 | sun4c_kstack_vma.vm_mm = &init_mm; | |
1180 | sun4c_kstack_vma.vm_start = sun4c_taskstack_start; | |
1181 | sun4c_kstack_vma.vm_end = sun4c_taskstack_end; | |
1182 | sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; | |
1183 | sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; | |
1184 | insert_vm_struct(&init_mm, &sun4c_kstack_vma); | |
1185 | } | |
1186 | ||
1187 | /* Cache flushing on the sun4c. */ | |
1188 | static void sun4c_flush_cache_all(void) | |
1189 | { | |
1190 | unsigned long begin, end; | |
1191 | ||
1192 | flush_user_windows(); | |
1193 | begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); | |
1194 | end = (begin + SUN4C_VAC_SIZE); | |
1195 | ||
1196 | if (sun4c_vacinfo.linesize == 32) { | |
1197 | while (begin < end) { | |
1198 | __asm__ __volatile__( | |
1199 | "ld [%0 + 0x00], %%g0\n\t" | |
1200 | "ld [%0 + 0x20], %%g0\n\t" | |
1201 | "ld [%0 + 0x40], %%g0\n\t" | |
1202 | "ld [%0 + 0x60], %%g0\n\t" | |
1203 | "ld [%0 + 0x80], %%g0\n\t" | |
1204 | "ld [%0 + 0xa0], %%g0\n\t" | |
1205 | "ld [%0 + 0xc0], %%g0\n\t" | |
1206 | "ld [%0 + 0xe0], %%g0\n\t" | |
1207 | "ld [%0 + 0x100], %%g0\n\t" | |
1208 | "ld [%0 + 0x120], %%g0\n\t" | |
1209 | "ld [%0 + 0x140], %%g0\n\t" | |
1210 | "ld [%0 + 0x160], %%g0\n\t" | |
1211 | "ld [%0 + 0x180], %%g0\n\t" | |
1212 | "ld [%0 + 0x1a0], %%g0\n\t" | |
1213 | "ld [%0 + 0x1c0], %%g0\n\t" | |
1214 | "ld [%0 + 0x1e0], %%g0\n" | |
1215 | : : "r" (begin)); | |
1216 | begin += 512; | |
1217 | } | |
1218 | } else { | |
1219 | while (begin < end) { | |
1220 | __asm__ __volatile__( | |
1221 | "ld [%0 + 0x00], %%g0\n\t" | |
1222 | "ld [%0 + 0x10], %%g0\n\t" | |
1223 | "ld [%0 + 0x20], %%g0\n\t" | |
1224 | "ld [%0 + 0x30], %%g0\n\t" | |
1225 | "ld [%0 + 0x40], %%g0\n\t" | |
1226 | "ld [%0 + 0x50], %%g0\n\t" | |
1227 | "ld [%0 + 0x60], %%g0\n\t" | |
1228 | "ld [%0 + 0x70], %%g0\n\t" | |
1229 | "ld [%0 + 0x80], %%g0\n\t" | |
1230 | "ld [%0 + 0x90], %%g0\n\t" | |
1231 | "ld [%0 + 0xa0], %%g0\n\t" | |
1232 | "ld [%0 + 0xb0], %%g0\n\t" | |
1233 | "ld [%0 + 0xc0], %%g0\n\t" | |
1234 | "ld [%0 + 0xd0], %%g0\n\t" | |
1235 | "ld [%0 + 0xe0], %%g0\n\t" | |
1236 | "ld [%0 + 0xf0], %%g0\n" | |
1237 | : : "r" (begin)); | |
1238 | begin += 256; | |
1239 | } | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | static void sun4c_flush_cache_mm(struct mm_struct *mm) | |
1244 | { | |
1245 | int new_ctx = mm->context; | |
1246 | ||
1247 | if (new_ctx != NO_CONTEXT) { | |
1248 | flush_user_windows(); | |
1249 | ||
1250 | if (sun4c_context_ring[new_ctx].num_entries) { | |
1251 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1252 | unsigned long flags; | |
1253 | ||
1254 | local_irq_save(flags); | |
1255 | if (head->next != head) { | |
1256 | struct sun4c_mmu_entry *entry = head->next; | |
1257 | int savectx = sun4c_get_context(); | |
1258 | ||
1259 | sun4c_set_context(new_ctx); | |
1260 | sun4c_flush_context(); | |
1261 | do { | |
1262 | struct sun4c_mmu_entry *next = entry->next; | |
1263 | ||
1264 | sun4c_user_unmap(entry); | |
1265 | free_user_entry(new_ctx, entry); | |
1266 | ||
1267 | entry = next; | |
1268 | } while (entry != head); | |
1269 | sun4c_set_context(savectx); | |
1270 | } | |
1271 | local_irq_restore(flags); | |
1272 | } | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1277 | { | |
1278 | struct mm_struct *mm = vma->vm_mm; | |
1279 | int new_ctx = mm->context; | |
1280 | ||
1281 | if (new_ctx != NO_CONTEXT) { | |
1282 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1283 | struct sun4c_mmu_entry *entry; | |
1284 | unsigned long flags; | |
1285 | ||
1286 | flush_user_windows(); | |
1287 | ||
1288 | local_irq_save(flags); | |
1289 | /* All user segmap chains are ordered on entry->vaddr. */ | |
1290 | for (entry = head->next; | |
1291 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1292 | entry = entry->next) | |
1293 | ; | |
1294 | ||
1295 | /* Tracing various job mixtures showed that this conditional | |
1296 | * only passes ~35% of the time for most worse case situations, | |
1297 | * therefore we avoid all of this gross overhead ~65% of the time. | |
1298 | */ | |
1299 | if ((entry != head) && (entry->vaddr < end)) { | |
1300 | int octx = sun4c_get_context(); | |
1301 | sun4c_set_context(new_ctx); | |
1302 | ||
1303 | /* At this point, always, (start >= entry->vaddr) and | |
1304 | * (entry->vaddr < end), once the latter condition | |
1305 | * ceases to hold, or we hit the end of the list, we | |
1306 | * exit the loop. The ordering of all user allocated | |
1307 | * segmaps makes this all work out so beautifully. | |
1308 | */ | |
1309 | do { | |
1310 | struct sun4c_mmu_entry *next = entry->next; | |
1311 | unsigned long realend; | |
1312 | ||
1313 | /* "realstart" is always >= entry->vaddr */ | |
1314 | realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; | |
1315 | if (end < realend) | |
1316 | realend = end; | |
1317 | if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { | |
1318 | unsigned long page = entry->vaddr; | |
1319 | while (page < realend) { | |
1320 | sun4c_flush_page(page); | |
1321 | page += PAGE_SIZE; | |
1322 | } | |
1323 | } else { | |
1324 | sun4c_flush_segment(entry->vaddr); | |
1325 | sun4c_user_unmap(entry); | |
1326 | free_user_entry(new_ctx, entry); | |
1327 | } | |
1328 | entry = next; | |
1329 | } while ((entry != head) && (entry->vaddr < end)); | |
1330 | sun4c_set_context(octx); | |
1331 | } | |
1332 | local_irq_restore(flags); | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
1337 | { | |
1338 | struct mm_struct *mm = vma->vm_mm; | |
1339 | int new_ctx = mm->context; | |
1340 | ||
1341 | /* Sun4c has no separate I/D caches so cannot optimize for non | |
1342 | * text page flushes. | |
1343 | */ | |
1344 | if (new_ctx != NO_CONTEXT) { | |
1345 | int octx = sun4c_get_context(); | |
1346 | unsigned long flags; | |
1347 | ||
1348 | flush_user_windows(); | |
1349 | local_irq_save(flags); | |
1350 | sun4c_set_context(new_ctx); | |
1351 | sun4c_flush_page(page); | |
1352 | sun4c_set_context(octx); | |
1353 | local_irq_restore(flags); | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | static void sun4c_flush_page_to_ram(unsigned long page) | |
1358 | { | |
1359 | unsigned long flags; | |
1360 | ||
1361 | local_irq_save(flags); | |
1362 | sun4c_flush_page(page); | |
1363 | local_irq_restore(flags); | |
1364 | } | |
1365 | ||
1366 | /* Sun4c cache is unified, both instructions and data live there, so | |
1367 | * no need to flush the on-stack instructions for new signal handlers. | |
1368 | */ | |
1369 | static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1370 | { | |
1371 | } | |
1372 | ||
1373 | /* TLB flushing on the sun4c. These routines count on the cache | |
1374 | * flushing code to flush the user register windows so that we need | |
1375 | * not do so when we get here. | |
1376 | */ | |
1377 | ||
1378 | static void sun4c_flush_tlb_all(void) | |
1379 | { | |
1380 | struct sun4c_mmu_entry *this_entry, *next_entry; | |
1381 | unsigned long flags; | |
1382 | int savectx, ctx; | |
1383 | ||
1384 | local_irq_save(flags); | |
1385 | this_entry = sun4c_kernel_ring.ringhd.next; | |
1386 | savectx = sun4c_get_context(); | |
1387 | flush_user_windows(); | |
1388 | while (sun4c_kernel_ring.num_entries) { | |
1389 | next_entry = this_entry->next; | |
1390 | sun4c_flush_segment(this_entry->vaddr); | |
1391 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
1392 | sun4c_set_context(ctx); | |
1393 | sun4c_put_segmap(this_entry->vaddr, invalid_segment); | |
1394 | } | |
1395 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
1396 | this_entry = next_entry; | |
1397 | } | |
1398 | sun4c_set_context(savectx); | |
1399 | local_irq_restore(flags); | |
1400 | } | |
1401 | ||
1402 | static void sun4c_flush_tlb_mm(struct mm_struct *mm) | |
1403 | { | |
1404 | int new_ctx = mm->context; | |
1405 | ||
1406 | if (new_ctx != NO_CONTEXT) { | |
1407 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1408 | unsigned long flags; | |
1409 | ||
1410 | local_irq_save(flags); | |
1411 | if (head->next != head) { | |
1412 | struct sun4c_mmu_entry *entry = head->next; | |
1413 | int savectx = sun4c_get_context(); | |
1414 | ||
1415 | sun4c_set_context(new_ctx); | |
1416 | sun4c_flush_context(); | |
1417 | do { | |
1418 | struct sun4c_mmu_entry *next = entry->next; | |
1419 | ||
1420 | sun4c_user_unmap(entry); | |
1421 | free_user_entry(new_ctx, entry); | |
1422 | ||
1423 | entry = next; | |
1424 | } while (entry != head); | |
1425 | sun4c_set_context(savectx); | |
1426 | } | |
1427 | local_irq_restore(flags); | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1432 | { | |
1433 | struct mm_struct *mm = vma->vm_mm; | |
1434 | int new_ctx = mm->context; | |
1435 | ||
1436 | if (new_ctx != NO_CONTEXT) { | |
1437 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1438 | struct sun4c_mmu_entry *entry; | |
1439 | unsigned long flags; | |
1440 | ||
1441 | local_irq_save(flags); | |
1442 | /* See commentary in sun4c_flush_cache_range(). */ | |
1443 | for (entry = head->next; | |
1444 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1445 | entry = entry->next) | |
1446 | ; | |
1447 | ||
1448 | if ((entry != head) && (entry->vaddr < end)) { | |
1449 | int octx = sun4c_get_context(); | |
1450 | ||
1451 | sun4c_set_context(new_ctx); | |
1452 | do { | |
1453 | struct sun4c_mmu_entry *next = entry->next; | |
1454 | ||
1455 | sun4c_flush_segment(entry->vaddr); | |
1456 | sun4c_user_unmap(entry); | |
1457 | free_user_entry(new_ctx, entry); | |
1458 | ||
1459 | entry = next; | |
1460 | } while ((entry != head) && (entry->vaddr < end)); | |
1461 | sun4c_set_context(octx); | |
1462 | } | |
1463 | local_irq_restore(flags); | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1468 | { | |
1469 | struct mm_struct *mm = vma->vm_mm; | |
1470 | int new_ctx = mm->context; | |
1471 | ||
1472 | if (new_ctx != NO_CONTEXT) { | |
1473 | int savectx = sun4c_get_context(); | |
1474 | unsigned long flags; | |
1475 | ||
1476 | local_irq_save(flags); | |
1477 | sun4c_set_context(new_ctx); | |
1478 | page &= PAGE_MASK; | |
1479 | sun4c_flush_page(page); | |
1480 | sun4c_put_pte(page, 0); | |
1481 | sun4c_set_context(savectx); | |
1482 | local_irq_restore(flags); | |
1483 | } | |
1484 | } | |
1485 | ||
1486 | static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) | |
1487 | { | |
14778d90 DM |
1488 | unsigned long page_entry, pg_iobits; |
1489 | ||
1490 | pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | | |
1491 | _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; | |
1da177e4 LT |
1492 | |
1493 | page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); | |
1494 | page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); | |
1495 | sun4c_put_pte(virt_addr, page_entry); | |
1496 | } | |
1497 | ||
1498 | static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, | |
1499 | unsigned long xva, unsigned int len) | |
1500 | { | |
1501 | while (len != 0) { | |
1502 | len -= PAGE_SIZE; | |
1503 | sun4c_mapioaddr(xpa, xva); | |
1504 | xva += PAGE_SIZE; | |
1505 | xpa += PAGE_SIZE; | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) | |
1510 | { | |
1511 | while (len != 0) { | |
1512 | len -= PAGE_SIZE; | |
1513 | sun4c_put_pte(virt_addr, 0); | |
1514 | virt_addr += PAGE_SIZE; | |
1515 | } | |
1516 | } | |
1517 | ||
1518 | static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) | |
1519 | { | |
1520 | struct ctx_list *ctxp; | |
1521 | ||
1522 | ctxp = ctx_free.next; | |
1523 | if (ctxp != &ctx_free) { | |
1524 | remove_from_ctx_list(ctxp); | |
1525 | add_to_used_ctxlist(ctxp); | |
1526 | mm->context = ctxp->ctx_number; | |
1527 | ctxp->ctx_mm = mm; | |
1528 | return; | |
1529 | } | |
1530 | ctxp = ctx_used.next; | |
1531 | if (ctxp->ctx_mm == old_mm) | |
1532 | ctxp = ctxp->next; | |
1533 | remove_from_ctx_list(ctxp); | |
1534 | add_to_used_ctxlist(ctxp); | |
1535 | ctxp->ctx_mm->context = NO_CONTEXT; | |
1536 | ctxp->ctx_mm = mm; | |
1537 | mm->context = ctxp->ctx_number; | |
1538 | sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], | |
1539 | ctxp->ctx_number); | |
1540 | } | |
1541 | ||
1542 | /* Switch the current MM context. */ | |
1543 | static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) | |
1544 | { | |
1545 | struct ctx_list *ctx; | |
1546 | int dirty = 0; | |
1547 | ||
1548 | if (mm->context == NO_CONTEXT) { | |
1549 | dirty = 1; | |
1550 | sun4c_alloc_context(old_mm, mm); | |
1551 | } else { | |
1552 | /* Update the LRU ring of contexts. */ | |
1553 | ctx = ctx_list_pool + mm->context; | |
1554 | remove_from_ctx_list(ctx); | |
1555 | add_to_used_ctxlist(ctx); | |
1556 | } | |
1557 | if (dirty || old_mm != mm) | |
1558 | sun4c_set_context(mm->context); | |
1559 | } | |
1560 | ||
1561 | static void sun4c_destroy_context(struct mm_struct *mm) | |
1562 | { | |
1563 | struct ctx_list *ctx_old; | |
1564 | ||
1565 | if (mm->context != NO_CONTEXT) { | |
1566 | sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); | |
1567 | ctx_old = ctx_list_pool + mm->context; | |
1568 | remove_from_ctx_list(ctx_old); | |
1569 | add_to_free_ctxlist(ctx_old); | |
1570 | mm->context = NO_CONTEXT; | |
1571 | } | |
1572 | } | |
1573 | ||
1574 | static void sun4c_mmu_info(struct seq_file *m) | |
1575 | { | |
1576 | int used_user_entries, i; | |
1577 | ||
1578 | used_user_entries = 0; | |
1579 | for (i = 0; i < num_contexts; i++) | |
1580 | used_user_entries += sun4c_context_ring[i].num_entries; | |
1581 | ||
1582 | seq_printf(m, | |
1583 | "vacsize\t\t: %d bytes\n" | |
1584 | "vachwflush\t: %s\n" | |
1585 | "vaclinesize\t: %d bytes\n" | |
1586 | "mmuctxs\t\t: %d\n" | |
1587 | "mmupsegs\t: %d\n" | |
1588 | "kernelpsegs\t: %d\n" | |
1589 | "kfreepsegs\t: %d\n" | |
1590 | "usedpsegs\t: %d\n" | |
1591 | "ufreepsegs\t: %d\n" | |
1592 | "user_taken\t: %d\n" | |
1593 | "max_taken\t: %d\n", | |
1594 | sun4c_vacinfo.num_bytes, | |
1595 | (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), | |
1596 | sun4c_vacinfo.linesize, | |
1597 | num_contexts, | |
1598 | (invalid_segment + 1), | |
1599 | sun4c_kernel_ring.num_entries, | |
1600 | sun4c_kfree_ring.num_entries, | |
1601 | used_user_entries, | |
1602 | sun4c_ufree_ring.num_entries, | |
1603 | sun4c_user_taken_entries, | |
1604 | max_user_taken_entries); | |
1605 | } | |
1606 | ||
1607 | /* Nothing below here should touch the mmu hardware nor the mmu_entry | |
1608 | * data structures. | |
1609 | */ | |
1610 | ||
1611 | /* First the functions which the mid-level code uses to directly | |
1612 | * manipulate the software page tables. Some defines since we are | |
1613 | * emulating the i386 page directory layout. | |
1614 | */ | |
1615 | #define PGD_PRESENT 0x001 | |
1616 | #define PGD_RW 0x002 | |
1617 | #define PGD_USER 0x004 | |
1618 | #define PGD_ACCESSED 0x020 | |
1619 | #define PGD_DIRTY 0x040 | |
1620 | #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) | |
1621 | ||
1622 | static void sun4c_set_pte(pte_t *ptep, pte_t pte) | |
1623 | { | |
1624 | *ptep = pte; | |
1625 | } | |
1626 | ||
1627 | static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) | |
1628 | { | |
1629 | } | |
1630 | ||
1631 | static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) | |
1632 | { | |
1633 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; | |
1634 | } | |
1635 | ||
1636 | static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) | |
1637 | { | |
1638 | if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ | |
1639 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); | |
1640 | } | |
1641 | ||
1642 | static int sun4c_pte_present(pte_t pte) | |
1643 | { | |
1644 | return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); | |
1645 | } | |
1646 | static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } | |
1647 | ||
1da177e4 LT |
1648 | static int sun4c_pmd_bad(pmd_t pmd) |
1649 | { | |
1650 | return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || | |
1651 | (!virt_addr_valid(pmd_val(pmd)))); | |
1652 | } | |
1653 | ||
1654 | static int sun4c_pmd_present(pmd_t pmd) | |
1655 | { | |
1656 | return ((pmd_val(pmd) & PGD_PRESENT) != 0); | |
1657 | } | |
1658 | ||
1659 | #if 0 /* if PMD takes one word */ | |
1660 | static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } | |
1661 | #else /* if pmd_t is a longish aggregate */ | |
1662 | static void sun4c_pmd_clear(pmd_t *pmdp) { | |
1663 | memset((void *)pmdp, 0, sizeof(pmd_t)); | |
1664 | } | |
1665 | #endif | |
1666 | ||
1667 | static int sun4c_pgd_none(pgd_t pgd) { return 0; } | |
1668 | static int sun4c_pgd_bad(pgd_t pgd) { return 0; } | |
1669 | static int sun4c_pgd_present(pgd_t pgd) { return 1; } | |
1670 | static void sun4c_pgd_clear(pgd_t * pgdp) { } | |
1671 | ||
1672 | /* | |
1673 | * The following only work if pte_present() is true. | |
1674 | * Undefined behaviour if not.. | |
1675 | */ | |
1676 | static pte_t sun4c_pte_mkwrite(pte_t pte) | |
1677 | { | |
1678 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); | |
1679 | if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) | |
1680 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1681 | return pte; | |
1682 | } | |
1683 | ||
1684 | static pte_t sun4c_pte_mkdirty(pte_t pte) | |
1685 | { | |
1686 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); | |
1687 | if (pte_val(pte) & _SUN4C_PAGE_WRITE) | |
1688 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1689 | return pte; | |
1690 | } | |
1691 | ||
1692 | static pte_t sun4c_pte_mkyoung(pte_t pte) | |
1693 | { | |
1694 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); | |
1695 | if (pte_val(pte) & _SUN4C_PAGE_READ) | |
1696 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); | |
1697 | return pte; | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * Conversion functions: convert a page and protection to a page entry, | |
1702 | * and a page entry and page directory to the page they refer to. | |
1703 | */ | |
1704 | static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot) | |
1705 | { | |
1706 | return __pte(page_to_pfn(page) | pgprot_val(pgprot)); | |
1707 | } | |
1708 | ||
1709 | static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) | |
1710 | { | |
1711 | return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1712 | } | |
1713 | ||
1714 | static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) | |
1715 | { | |
1716 | return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1717 | } | |
1718 | ||
1719 | static unsigned long sun4c_pte_pfn(pte_t pte) | |
1720 | { | |
1721 | return pte_val(pte) & SUN4C_PFN_MASK; | |
1722 | } | |
1723 | ||
1724 | static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) | |
1725 | { | |
1726 | return __pte(pgoff | _SUN4C_PAGE_FILE); | |
1727 | } | |
1728 | ||
1729 | static unsigned long sun4c_pte_to_pgoff(pte_t pte) | |
1730 | { | |
1731 | return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); | |
1732 | } | |
1733 | ||
1734 | ||
64d329ee | 1735 | static inline unsigned long sun4c_pmd_page_v(pmd_t pmd) |
1da177e4 LT |
1736 | { |
1737 | return (pmd_val(pmd) & PAGE_MASK); | |
1738 | } | |
1739 | ||
1740 | static struct page *sun4c_pmd_page(pmd_t pmd) | |
1741 | { | |
1742 | return virt_to_page(sun4c_pmd_page_v(pmd)); | |
1743 | } | |
1744 | ||
1745 | static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } | |
1746 | ||
1747 | /* to find an entry in a page-table-directory */ | |
1748 | static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) | |
1749 | { | |
1750 | return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); | |
1751 | } | |
1752 | ||
1753 | /* Find an entry in the second-level page table.. */ | |
1754 | static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) | |
1755 | { | |
1756 | return (pmd_t *) dir; | |
1757 | } | |
1758 | ||
1759 | /* Find an entry in the third-level page table.. */ | |
1760 | pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) | |
1761 | { | |
1762 | return (pte_t *) sun4c_pmd_page_v(*dir) + | |
1763 | ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); | |
1764 | } | |
1765 | ||
1766 | static unsigned long sun4c_swp_type(swp_entry_t entry) | |
1767 | { | |
1768 | return (entry.val & SUN4C_SWP_TYPE_MASK); | |
1769 | } | |
1770 | ||
1771 | static unsigned long sun4c_swp_offset(swp_entry_t entry) | |
1772 | { | |
1773 | return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; | |
1774 | } | |
1775 | ||
1776 | static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) | |
1777 | { | |
1778 | return (swp_entry_t) { | |
1779 | (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT | |
1780 | | (type & SUN4C_SWP_TYPE_MASK) }; | |
1781 | } | |
1782 | ||
1783 | static void sun4c_free_pte_slow(pte_t *pte) | |
1784 | { | |
1785 | free_page((unsigned long)pte); | |
1786 | } | |
1787 | ||
1788 | static void sun4c_free_pgd_slow(pgd_t *pgd) | |
1789 | { | |
1790 | free_page((unsigned long)pgd); | |
1791 | } | |
1792 | ||
1793 | static pgd_t *sun4c_get_pgd_fast(void) | |
1794 | { | |
1795 | unsigned long *ret; | |
1796 | ||
1797 | if ((ret = pgd_quicklist) != NULL) { | |
1798 | pgd_quicklist = (unsigned long *)(*ret); | |
1799 | ret[0] = ret[1]; | |
1800 | pgtable_cache_size--; | |
1801 | } else { | |
1802 | pgd_t *init; | |
1803 | ||
1804 | ret = (unsigned long *)__get_free_page(GFP_KERNEL); | |
1805 | memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); | |
1806 | init = sun4c_pgd_offset(&init_mm, 0); | |
1807 | memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
1808 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
1809 | } | |
1810 | return (pgd_t *)ret; | |
1811 | } | |
1812 | ||
1813 | static void sun4c_free_pgd_fast(pgd_t *pgd) | |
1814 | { | |
1815 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; | |
1816 | pgd_quicklist = (unsigned long *) pgd; | |
1817 | pgtable_cache_size++; | |
1818 | } | |
1819 | ||
1820 | ||
64d329ee | 1821 | static inline pte_t * |
1da177e4 LT |
1822 | sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) |
1823 | { | |
1824 | unsigned long *ret; | |
1825 | ||
1826 | if ((ret = (unsigned long *)pte_quicklist) != NULL) { | |
1827 | pte_quicklist = (unsigned long *)(*ret); | |
1828 | ret[0] = ret[1]; | |
1829 | pgtable_cache_size--; | |
1830 | } | |
1831 | return (pte_t *)ret; | |
1832 | } | |
1833 | ||
1834 | static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
1835 | { | |
1836 | pte_t *pte; | |
1837 | ||
1838 | if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) | |
1839 | return pte; | |
1840 | ||
b3dd5b82 | 1841 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
1da177e4 LT |
1842 | return pte; |
1843 | } | |
1844 | ||
2f569afd | 1845 | static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 | 1846 | { |
2f569afd MS |
1847 | pte_t *pte; |
1848 | struct page *page; | |
1849 | ||
1850 | pte = sun4c_pte_alloc_one_kernel(mm, address); | |
1da177e4 LT |
1851 | if (pte == NULL) |
1852 | return NULL; | |
2f569afd MS |
1853 | page = virt_to_page(pte); |
1854 | pgtable_page_ctor(page); | |
1855 | return page; | |
1da177e4 LT |
1856 | } |
1857 | ||
64d329ee | 1858 | static inline void sun4c_free_pte_fast(pte_t *pte) |
1da177e4 LT |
1859 | { |
1860 | *(unsigned long *)pte = (unsigned long) pte_quicklist; | |
1861 | pte_quicklist = (unsigned long *) pte; | |
1862 | pgtable_cache_size++; | |
1863 | } | |
1864 | ||
2f569afd | 1865 | static void sun4c_pte_free(pgtable_t pte) |
1da177e4 | 1866 | { |
2f569afd | 1867 | pgtable_page_dtor(pte); |
1da177e4 LT |
1868 | sun4c_free_pte_fast(page_address(pte)); |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
1873 | * inside the pgd, so has no extra memory associated with it. | |
1874 | */ | |
1875 | static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
1876 | { | |
1877 | BUG(); | |
1878 | return NULL; | |
1879 | } | |
1880 | ||
1881 | static void sun4c_free_pmd_fast(pmd_t * pmd) { } | |
1882 | ||
1883 | static void sun4c_check_pgt_cache(int low, int high) | |
1884 | { | |
1885 | if (pgtable_cache_size > high) { | |
1886 | do { | |
1887 | if (pgd_quicklist) | |
1888 | sun4c_free_pgd_slow(sun4c_get_pgd_fast()); | |
1889 | if (pte_quicklist) | |
1890 | sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); | |
1891 | } while (pgtable_cache_size > low); | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | /* An experiment, turn off by default for now... -DaveM */ | |
1896 | #define SUN4C_PRELOAD_PSEG | |
1897 | ||
1898 | void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte) | |
1899 | { | |
1900 | unsigned long flags; | |
1901 | int pseg; | |
1902 | ||
da4e9fea MF |
1903 | if (vma->vm_mm->context == NO_CONTEXT) |
1904 | return; | |
1905 | ||
1da177e4 LT |
1906 | local_irq_save(flags); |
1907 | address &= PAGE_MASK; | |
1908 | if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { | |
1909 | struct sun4c_mmu_entry *entry = sun4c_user_strategy(); | |
1910 | struct mm_struct *mm = vma->vm_mm; | |
1911 | unsigned long start, end; | |
1912 | ||
1913 | entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); | |
1914 | entry->ctx = mm->context; | |
1915 | add_ring_ordered(sun4c_context_ring + mm->context, entry); | |
1916 | sun4c_put_segmap(entry->vaddr, entry->pseg); | |
1917 | end = start + SUN4C_REAL_PGDIR_SIZE; | |
1918 | while (start < end) { | |
1919 | #ifdef SUN4C_PRELOAD_PSEG | |
1920 | pgd_t *pgdp = sun4c_pgd_offset(mm, start); | |
1921 | pte_t *ptep; | |
1922 | ||
1923 | if (!pgdp) | |
1924 | goto no_mapping; | |
1925 | ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); | |
1926 | if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) | |
1927 | goto no_mapping; | |
1928 | sun4c_put_pte(start, pte_val(*ptep)); | |
1929 | goto next; | |
1930 | ||
1931 | no_mapping: | |
1932 | #endif | |
1933 | sun4c_put_pte(start, 0); | |
1934 | #ifdef SUN4C_PRELOAD_PSEG | |
1935 | next: | |
1936 | #endif | |
1937 | start += PAGE_SIZE; | |
1938 | } | |
1939 | #ifndef SUN4C_PRELOAD_PSEG | |
1940 | sun4c_put_pte(address, pte_val(pte)); | |
1941 | #endif | |
1942 | local_irq_restore(flags); | |
1943 | return; | |
1944 | } else { | |
1945 | struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; | |
1946 | ||
1947 | remove_lru(entry); | |
1948 | add_lru(entry); | |
1949 | } | |
1950 | ||
1951 | sun4c_put_pte(address, pte_val(pte)); | |
1952 | local_irq_restore(flags); | |
1953 | } | |
1954 | ||
1955 | extern void sparc_context_init(int); | |
1956 | extern unsigned long end; | |
1957 | extern unsigned long bootmem_init(unsigned long *pages_avail); | |
1958 | extern unsigned long last_valid_pfn; | |
1959 | ||
1960 | void __init sun4c_paging_init(void) | |
1961 | { | |
1962 | int i, cnt; | |
1963 | unsigned long kernel_end, vaddr; | |
1964 | extern struct resource sparc_iomap; | |
1965 | unsigned long end_pfn, pages_avail; | |
1966 | ||
1967 | kernel_end = (unsigned long) &end; | |
1da177e4 LT |
1968 | kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); |
1969 | ||
1970 | pages_avail = 0; | |
1971 | last_valid_pfn = bootmem_init(&pages_avail); | |
1972 | end_pfn = last_valid_pfn; | |
1973 | ||
1974 | sun4c_probe_mmu(); | |
1975 | invalid_segment = (num_segmaps - 1); | |
1976 | sun4c_init_mmu_entry_pool(); | |
1977 | sun4c_init_rings(); | |
1978 | sun4c_init_map_kernelprom(kernel_end); | |
1979 | sun4c_init_clean_mmu(kernel_end); | |
1980 | sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); | |
1981 | sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); | |
1982 | sun4c_init_lock_area(DVMA_VADDR, DVMA_END); | |
1983 | sun4c_init_lock_areas(); | |
1984 | sun4c_init_fill_user_ring(); | |
1985 | ||
1986 | sun4c_set_context(0); | |
1987 | memset(swapper_pg_dir, 0, PAGE_SIZE); | |
1988 | memset(pg0, 0, PAGE_SIZE); | |
1989 | memset(pg1, 0, PAGE_SIZE); | |
1990 | memset(pg2, 0, PAGE_SIZE); | |
1991 | memset(pg3, 0, PAGE_SIZE); | |
1992 | ||
1993 | /* Save work later. */ | |
1994 | vaddr = VMALLOC_START; | |
1995 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); | |
1996 | vaddr += SUN4C_PGDIR_SIZE; | |
1997 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); | |
1998 | vaddr += SUN4C_PGDIR_SIZE; | |
1999 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); | |
2000 | vaddr += SUN4C_PGDIR_SIZE; | |
2001 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); | |
2002 | sun4c_init_ss2_cache_bug(); | |
2003 | sparc_context_init(num_contexts); | |
2004 | ||
2005 | { | |
2006 | unsigned long zones_size[MAX_NR_ZONES]; | |
2007 | unsigned long zholes_size[MAX_NR_ZONES]; | |
2008 | unsigned long npages; | |
2009 | int znum; | |
2010 | ||
2011 | for (znum = 0; znum < MAX_NR_ZONES; znum++) | |
2012 | zones_size[znum] = zholes_size[znum] = 0; | |
2013 | ||
2014 | npages = max_low_pfn - pfn_base; | |
2015 | ||
2016 | zones_size[ZONE_DMA] = npages; | |
2017 | zholes_size[ZONE_DMA] = npages - pages_avail; | |
2018 | ||
2019 | npages = highend_pfn - max_low_pfn; | |
2020 | zones_size[ZONE_HIGHMEM] = npages; | |
2021 | zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); | |
2022 | ||
9109fb7b | 2023 | free_area_init_node(0, zones_size, pfn_base, zholes_size); |
1da177e4 LT |
2024 | } |
2025 | ||
2026 | cnt = 0; | |
2027 | for (i = 0; i < num_segmaps; i++) | |
2028 | if (mmu_entry_pool[i].locked) | |
2029 | cnt++; | |
2030 | ||
2031 | max_user_taken_entries = num_segmaps - cnt - 40 - 1; | |
2032 | ||
2033 | printk("SUN4C: %d mmu entries for the kernel\n", cnt); | |
2034 | } | |
2035 | ||
14778d90 DM |
2036 | static pgprot_t sun4c_pgprot_noncached(pgprot_t prot) |
2037 | { | |
2038 | prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE); | |
2039 | ||
2040 | return prot; | |
2041 | } | |
2042 | ||
1da177e4 LT |
2043 | /* Load up routines and constants for sun4c mmu */ |
2044 | void __init ld_mmu_sun4c(void) | |
2045 | { | |
2046 | extern void ___xchg32_sun4c(void); | |
2047 | ||
2048 | printk("Loading sun4c MMU routines\n"); | |
2049 | ||
2050 | /* First the constants */ | |
2051 | BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); | |
2052 | BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); | |
2053 | BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); | |
2054 | ||
2055 | BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); | |
2056 | BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); | |
2057 | BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); | |
2058 | ||
2059 | BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); | |
378e515c | 2060 | PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED); |
1da177e4 LT |
2061 | BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); |
2062 | BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); | |
2063 | BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); | |
2064 | page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); | |
1da177e4 LT |
2065 | |
2066 | /* Functions */ | |
14778d90 | 2067 | BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM); |
1da177e4 LT |
2068 | BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); |
2069 | BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); | |
2070 | ||
2071 | BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); | |
2072 | ||
2073 | if (sun4c_vacinfo.do_hwflushes) { | |
2074 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); | |
2075 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); | |
2076 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); | |
2077 | } else { | |
2078 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); | |
2079 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); | |
2080 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); | |
2081 | } | |
2082 | ||
2083 | BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); | |
2084 | BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); | |
2085 | BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); | |
2086 | BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); | |
2087 | BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); | |
2088 | BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); | |
2089 | BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); | |
2090 | BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); | |
2091 | BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); | |
2092 | BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); | |
2093 | ||
2094 | BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); | |
2095 | ||
2096 | BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); | |
2097 | ||
2098 | /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */ | |
2099 | /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */ | |
2100 | ||
2101 | BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); | |
2102 | #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ | |
2103 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); | |
2104 | #else | |
2105 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); | |
2106 | #endif | |
2107 | BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); | |
2108 | BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); | |
2109 | ||
2110 | BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); | |
2111 | BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); | |
1da177e4 LT |
2112 | |
2113 | BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); | |
2114 | BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); | |
2115 | BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); | |
2116 | ||
2117 | BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); | |
2118 | BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); | |
2119 | BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); | |
2120 | BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); | |
2121 | ||
2122 | BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); | |
2123 | BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); | |
2124 | BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); | |
2125 | ||
2126 | BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); | |
2127 | BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); | |
2128 | BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); | |
2129 | BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); | |
2130 | BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); | |
2131 | BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); | |
2132 | BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); | |
2133 | BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); | |
2134 | BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); | |
2135 | BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); | |
2136 | BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); | |
2137 | ||
2138 | BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); | |
2139 | BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); | |
2140 | BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); | |
2141 | BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); | |
2142 | BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); | |
2143 | BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); | |
2144 | BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); | |
2145 | BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); | |
2146 | BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); | |
2147 | BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); | |
2148 | BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); | |
2149 | ||
2150 | BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); | |
2151 | BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); | |
2152 | ||
2153 | BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); | |
2154 | BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); | |
2155 | ||
2156 | BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); | |
2157 | BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); | |
2158 | BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); | |
2159 | BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); | |
2160 | ||
2161 | BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); | |
2162 | BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); | |
1da177e4 LT |
2163 | |
2164 | BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); | |
2165 | BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); | |
2166 | ||
2167 | BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); | |
2168 | BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); | |
2169 | BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); | |
2170 | ||
2171 | BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); | |
2172 | BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); | |
2173 | ||
2174 | BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); | |
2175 | ||
2176 | /* These should _never_ get called with two level tables. */ | |
2177 | BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); | |
46a82b2d | 2178 | BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0); |
1da177e4 | 2179 | } |