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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> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 LT |
16 | #include <linux/bootmem.h> |
17 | #include <linux/highmem.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/seq_file.h> | |
0912a5db | 20 | #include <linux/scatterlist.h> |
e756fd80 | 21 | #include <linux/bitmap.h> |
1da177e4 | 22 | |
86ed40bd | 23 | #include <asm/sections.h> |
1da177e4 LT |
24 | #include <asm/page.h> |
25 | #include <asm/pgalloc.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/vaddrs.h> | |
28 | #include <asm/idprom.h> | |
29 | #include <asm/machines.h> | |
30 | #include <asm/memreg.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/auxio.h> | |
33 | #include <asm/io.h> | |
34 | #include <asm/oplib.h> | |
35 | #include <asm/openprom.h> | |
36 | #include <asm/mmu_context.h> | |
1da177e4 LT |
37 | #include <asm/highmem.h> |
38 | #include <asm/btfixup.h> | |
39 | #include <asm/cacheflush.h> | |
40 | #include <asm/tlbflush.h> | |
41 | ||
42 | /* Because of our dynamic kernel TLB miss strategy, and how | |
43 | * our DVMA mapping allocation works, you _MUST_: | |
44 | * | |
45 | * 1) Disable interrupts _and_ not touch any dynamic kernel | |
46 | * memory while messing with kernel MMU state. By | |
47 | * dynamic memory I mean any object which is not in | |
48 | * the kernel image itself or a thread_union (both of | |
49 | * which are locked into the MMU). | |
50 | * 2) Disable interrupts while messing with user MMU state. | |
51 | */ | |
52 | ||
53 | extern int num_segmaps, num_contexts; | |
54 | ||
55 | extern unsigned long page_kernel; | |
56 | ||
1da177e4 LT |
57 | /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536. |
58 | * So let's save some cycles and just use that everywhere except for that bootup | |
59 | * sanity check. | |
60 | */ | |
61 | #define SUN4C_VAC_SIZE 65536 | |
1da177e4 LT |
62 | |
63 | #define SUN4C_KERNEL_BUCKETS 32 | |
64 | ||
65 | /* Flushing the cache. */ | |
66 | struct sun4c_vac_props sun4c_vacinfo; | |
67 | unsigned long sun4c_kernel_faults; | |
68 | ||
69 | /* Invalidate every sun4c cache line tag. */ | |
70 | static void __init sun4c_flush_all(void) | |
71 | { | |
72 | unsigned long begin, end; | |
73 | ||
74 | if (sun4c_vacinfo.on) | |
75 | panic("SUN4C: AIEEE, trying to invalidate vac while it is on."); | |
76 | ||
77 | /* Clear 'valid' bit in all cache line tags */ | |
78 | begin = AC_CACHETAGS; | |
79 | end = (AC_CACHETAGS + SUN4C_VAC_SIZE); | |
80 | while (begin < end) { | |
81 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
82 | "r" (begin), "i" (ASI_CONTROL)); | |
83 | begin += sun4c_vacinfo.linesize; | |
84 | } | |
85 | } | |
86 | ||
87 | static void sun4c_flush_context_hw(void) | |
88 | { | |
89 | unsigned long end = SUN4C_VAC_SIZE; | |
90 | ||
91 | __asm__ __volatile__( | |
92 | "1: addcc %0, -4096, %0\n\t" | |
93 | " bne 1b\n\t" | |
94 | " sta %%g0, [%0] %2" | |
95 | : "=&r" (end) | |
96 | : "0" (end), "i" (ASI_HWFLUSHCONTEXT) | |
97 | : "cc"); | |
98 | } | |
99 | ||
100 | /* Must be called minimally with IRQs disabled. */ | |
101 | static void sun4c_flush_segment_hw(unsigned long addr) | |
102 | { | |
103 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
104 | unsigned long vac_size = SUN4C_VAC_SIZE; | |
105 | ||
106 | __asm__ __volatile__( | |
107 | "1: addcc %0, -4096, %0\n\t" | |
108 | " bne 1b\n\t" | |
109 | " sta %%g0, [%2 + %0] %3" | |
110 | : "=&r" (vac_size) | |
111 | : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG) | |
112 | : "cc"); | |
113 | } | |
114 | } | |
115 | ||
116 | /* File local boot time fixups. */ | |
117 | BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long) | |
118 | BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long) | |
119 | BTFIXUPDEF_CALL(void, sun4c_flush_context, void) | |
120 | ||
121 | #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr) | |
122 | #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr) | |
123 | #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)() | |
124 | ||
125 | /* Must be called minimally with interrupts disabled. */ | |
126 | static void sun4c_flush_page_hw(unsigned long addr) | |
127 | { | |
128 | addr &= PAGE_MASK; | |
129 | if ((int)sun4c_get_pte(addr) < 0) | |
130 | __asm__ __volatile__("sta %%g0, [%0] %1" | |
131 | : : "r" (addr), "i" (ASI_HWFLUSHPAGE)); | |
132 | } | |
133 | ||
134 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
135 | static void sun4c_flush_context_sw(void) | |
136 | { | |
137 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
138 | unsigned long lsize = sun4c_vacinfo.linesize; | |
139 | ||
140 | __asm__ __volatile__( | |
141 | "add %2, %2, %%g1\n\t" | |
142 | "add %2, %%g1, %%g2\n\t" | |
143 | "add %2, %%g2, %%g3\n\t" | |
144 | "add %2, %%g3, %%g4\n\t" | |
145 | "add %2, %%g4, %%g5\n\t" | |
146 | "add %2, %%g5, %%o4\n\t" | |
147 | "add %2, %%o4, %%o5\n" | |
148 | "1:\n\t" | |
149 | "subcc %0, %%o5, %0\n\t" | |
150 | "sta %%g0, [%0] %3\n\t" | |
151 | "sta %%g0, [%0 + %2] %3\n\t" | |
152 | "sta %%g0, [%0 + %%g1] %3\n\t" | |
153 | "sta %%g0, [%0 + %%g2] %3\n\t" | |
154 | "sta %%g0, [%0 + %%g3] %3\n\t" | |
155 | "sta %%g0, [%0 + %%g4] %3\n\t" | |
156 | "sta %%g0, [%0 + %%g5] %3\n\t" | |
157 | "bg 1b\n\t" | |
158 | " sta %%g0, [%1 + %%o4] %3\n" | |
159 | : "=&r" (nbytes) | |
160 | : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX) | |
161 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
162 | } | |
163 | ||
164 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
165 | static void sun4c_flush_segment_sw(unsigned long addr) | |
166 | { | |
167 | if (sun4c_get_segmap(addr) != invalid_segment) { | |
168 | unsigned long nbytes = SUN4C_VAC_SIZE; | |
169 | unsigned long lsize = sun4c_vacinfo.linesize; | |
170 | ||
171 | __asm__ __volatile__( | |
172 | "add %2, %2, %%g1\n\t" | |
173 | "add %2, %%g1, %%g2\n\t" | |
174 | "add %2, %%g2, %%g3\n\t" | |
175 | "add %2, %%g3, %%g4\n\t" | |
176 | "add %2, %%g4, %%g5\n\t" | |
177 | "add %2, %%g5, %%o4\n\t" | |
178 | "add %2, %%o4, %%o5\n" | |
179 | "1:\n\t" | |
180 | "subcc %1, %%o5, %1\n\t" | |
181 | "sta %%g0, [%0] %6\n\t" | |
182 | "sta %%g0, [%0 + %2] %6\n\t" | |
183 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
184 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
185 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
186 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
187 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
188 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
189 | "bg 1b\n\t" | |
190 | " add %0, %%o5, %0\n" | |
191 | : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize) | |
192 | : "0" (addr), "1" (nbytes), "2" (lsize), | |
193 | "i" (ASI_FLUSHSEG) | |
194 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
195 | } | |
196 | } | |
197 | ||
198 | /* Don't inline the software version as it eats too many cache lines if expanded. */ | |
199 | static void sun4c_flush_page_sw(unsigned long addr) | |
200 | { | |
201 | addr &= PAGE_MASK; | |
202 | if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) == | |
203 | _SUN4C_PAGE_VALID) { | |
204 | unsigned long left = PAGE_SIZE; | |
205 | unsigned long lsize = sun4c_vacinfo.linesize; | |
206 | ||
207 | __asm__ __volatile__( | |
208 | "add %2, %2, %%g1\n\t" | |
209 | "add %2, %%g1, %%g2\n\t" | |
210 | "add %2, %%g2, %%g3\n\t" | |
211 | "add %2, %%g3, %%g4\n\t" | |
212 | "add %2, %%g4, %%g5\n\t" | |
213 | "add %2, %%g5, %%o4\n\t" | |
214 | "add %2, %%o4, %%o5\n" | |
215 | "1:\n\t" | |
216 | "subcc %1, %%o5, %1\n\t" | |
217 | "sta %%g0, [%0] %6\n\t" | |
218 | "sta %%g0, [%0 + %2] %6\n\t" | |
219 | "sta %%g0, [%0 + %%g1] %6\n\t" | |
220 | "sta %%g0, [%0 + %%g2] %6\n\t" | |
221 | "sta %%g0, [%0 + %%g3] %6\n\t" | |
222 | "sta %%g0, [%0 + %%g4] %6\n\t" | |
223 | "sta %%g0, [%0 + %%g5] %6\n\t" | |
224 | "sta %%g0, [%0 + %%o4] %6\n\t" | |
225 | "bg 1b\n\t" | |
226 | " add %0, %%o5, %0\n" | |
227 | : "=&r" (addr), "=&r" (left), "=&r" (lsize) | |
228 | : "0" (addr), "1" (left), "2" (lsize), | |
229 | "i" (ASI_FLUSHPG) | |
230 | : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc"); | |
231 | } | |
232 | } | |
233 | ||
234 | /* The sun4c's do have an on chip store buffer. And the way you | |
235 | * clear them out isn't so obvious. The only way I can think of | |
236 | * to accomplish this is to read the current context register, | |
237 | * store the same value there, then read an external hardware | |
238 | * register. | |
239 | */ | |
240 | void sun4c_complete_all_stores(void) | |
241 | { | |
242 | volatile int _unused; | |
243 | ||
244 | _unused = sun4c_get_context(); | |
245 | sun4c_set_context(_unused); | |
1da177e4 | 246 | _unused = get_auxio(); |
1da177e4 LT |
247 | } |
248 | ||
249 | /* Bootup utility functions. */ | |
250 | static inline void sun4c_init_clean_segmap(unsigned char pseg) | |
251 | { | |
252 | unsigned long vaddr; | |
253 | ||
254 | sun4c_put_segmap(0, pseg); | |
255 | for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE) | |
256 | sun4c_put_pte(vaddr, 0); | |
257 | sun4c_put_segmap(0, invalid_segment); | |
258 | } | |
259 | ||
260 | static inline void sun4c_init_clean_mmu(unsigned long kernel_end) | |
261 | { | |
262 | unsigned long vaddr; | |
263 | unsigned char savectx, ctx; | |
264 | ||
265 | savectx = sun4c_get_context(); | |
1da177e4 LT |
266 | for (ctx = 0; ctx < num_contexts; ctx++) { |
267 | sun4c_set_context(ctx); | |
268 | for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
269 | sun4c_put_segmap(vaddr, invalid_segment); | |
270 | for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
271 | sun4c_put_segmap(vaddr, invalid_segment); | |
272 | for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
273 | sun4c_put_segmap(vaddr, invalid_segment); | |
274 | for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE) | |
275 | sun4c_put_segmap(vaddr, invalid_segment); | |
276 | } | |
277 | sun4c_set_context(savectx); | |
278 | } | |
279 | ||
280 | void __init sun4c_probe_vac(void) | |
281 | { | |
282 | sun4c_disable_vac(); | |
283 | ||
5110bd21 AB |
284 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
285 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
286 | /* PROM on SS1 lacks this info, to be super safe we | |
287 | * hard code it here since this arch is cast in stone. | |
288 | */ | |
289 | sun4c_vacinfo.num_bytes = 65536; | |
290 | sun4c_vacinfo.linesize = 16; | |
1da177e4 | 291 | } else { |
5110bd21 AB |
292 | sun4c_vacinfo.num_bytes = |
293 | prom_getintdefault(prom_root_node, "vac-size", 65536); | |
294 | sun4c_vacinfo.linesize = | |
295 | prom_getintdefault(prom_root_node, "vac-linesize", 16); | |
296 | } | |
297 | sun4c_vacinfo.do_hwflushes = | |
298 | prom_getintdefault(prom_root_node, "vac-hwflush", 0); | |
1da177e4 | 299 | |
5110bd21 AB |
300 | if (sun4c_vacinfo.do_hwflushes == 0) |
301 | sun4c_vacinfo.do_hwflushes = | |
302 | prom_getintdefault(prom_root_node, "vac_hwflush", 0); | |
1da177e4 | 303 | |
5110bd21 AB |
304 | if (sun4c_vacinfo.num_bytes != 65536) { |
305 | prom_printf("WEIRD Sun4C VAC cache size, " | |
306 | "tell sparclinux@vger.kernel.org"); | |
307 | prom_halt(); | |
1da177e4 LT |
308 | } |
309 | ||
1da177e4 LT |
310 | switch (sun4c_vacinfo.linesize) { |
311 | case 16: | |
312 | sun4c_vacinfo.log2lsize = 4; | |
313 | break; | |
314 | case 32: | |
315 | sun4c_vacinfo.log2lsize = 5; | |
316 | break; | |
317 | default: | |
318 | prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n", | |
319 | sun4c_vacinfo.linesize); | |
320 | prom_halt(); | |
321 | }; | |
322 | ||
323 | sun4c_flush_all(); | |
324 | sun4c_enable_vac(); | |
325 | } | |
326 | ||
327 | /* Patch instructions for the low level kernel fault handler. */ | |
328 | extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff; | |
329 | extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff; | |
330 | extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff; | |
331 | extern unsigned long num_context_patch1, num_context_patch1_16; | |
332 | extern unsigned long num_context_patch2_16; | |
333 | extern unsigned long vac_linesize_patch, vac_linesize_patch_32; | |
334 | extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on; | |
335 | extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on; | |
336 | ||
337 | #define PATCH_INSN(src, dst) do { \ | |
338 | daddr = &(dst); \ | |
339 | iaddr = &(src); \ | |
340 | *daddr = *iaddr; \ | |
341 | } while (0) | |
342 | ||
343 | static void __init patch_kernel_fault_handler(void) | |
344 | { | |
345 | unsigned long *iaddr, *daddr; | |
346 | ||
347 | switch (num_segmaps) { | |
348 | case 128: | |
349 | /* Default, nothing to do. */ | |
350 | break; | |
351 | case 256: | |
352 | PATCH_INSN(invalid_segment_patch1_ff, | |
353 | invalid_segment_patch1); | |
354 | PATCH_INSN(invalid_segment_patch2_ff, | |
355 | invalid_segment_patch2); | |
356 | break; | |
357 | case 512: | |
358 | PATCH_INSN(invalid_segment_patch1_1ff, | |
359 | invalid_segment_patch1); | |
360 | PATCH_INSN(invalid_segment_patch2_1ff, | |
361 | invalid_segment_patch2); | |
362 | break; | |
363 | default: | |
364 | prom_printf("Unhandled number of segmaps: %d\n", | |
365 | num_segmaps); | |
366 | prom_halt(); | |
367 | }; | |
368 | switch (num_contexts) { | |
369 | case 8: | |
370 | /* Default, nothing to do. */ | |
371 | break; | |
372 | case 16: | |
373 | PATCH_INSN(num_context_patch1_16, | |
374 | num_context_patch1); | |
375 | break; | |
376 | default: | |
377 | prom_printf("Unhandled number of contexts: %d\n", | |
378 | num_contexts); | |
379 | prom_halt(); | |
380 | }; | |
381 | ||
382 | if (sun4c_vacinfo.do_hwflushes != 0) { | |
383 | PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1); | |
384 | PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2); | |
385 | } else { | |
386 | switch (sun4c_vacinfo.linesize) { | |
387 | case 16: | |
388 | /* Default, nothing to do. */ | |
389 | break; | |
390 | case 32: | |
391 | PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch); | |
392 | break; | |
393 | default: | |
394 | prom_printf("Impossible VAC linesize %d, halting...\n", | |
395 | sun4c_vacinfo.linesize); | |
396 | prom_halt(); | |
397 | }; | |
398 | } | |
399 | } | |
400 | ||
401 | static void __init sun4c_probe_mmu(void) | |
402 | { | |
5110bd21 AB |
403 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || |
404 | (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { | |
405 | /* Hardcode these just to be safe, PROM on SS1 does | |
406 | * not have this info available in the root node. | |
407 | */ | |
408 | num_segmaps = 128; | |
409 | num_contexts = 8; | |
1da177e4 | 410 | } else { |
5110bd21 AB |
411 | num_segmaps = |
412 | prom_getintdefault(prom_root_node, "mmu-npmg", 128); | |
413 | num_contexts = | |
414 | prom_getintdefault(prom_root_node, "mmu-nctx", 0x8); | |
1da177e4 LT |
415 | } |
416 | patch_kernel_fault_handler(); | |
417 | } | |
418 | ||
a3297296 | 419 | volatile unsigned long __iomem *sun4c_memerr_reg = NULL; |
1da177e4 LT |
420 | |
421 | void __init sun4c_probe_memerr_reg(void) | |
422 | { | |
8d125562 | 423 | phandle node; |
1da177e4 LT |
424 | struct linux_prom_registers regs[1]; |
425 | ||
5110bd21 AB |
426 | node = prom_getchild(prom_root_node); |
427 | node = prom_searchsiblings(prom_root_node, "memory-error"); | |
428 | if (!node) | |
429 | return; | |
430 | if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0) | |
431 | return; | |
432 | /* hmm I think regs[0].which_io is zero here anyways */ | |
433 | sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size); | |
1da177e4 LT |
434 | } |
435 | ||
436 | static inline void sun4c_init_ss2_cache_bug(void) | |
437 | { | |
1da177e4 LT |
438 | if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) || |
439 | (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) || | |
1da177e4 LT |
440 | (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) { |
441 | /* Whee.. */ | |
442 | printk("SS2 cache bug detected, uncaching trap table page\n"); | |
b2a39b0d SR |
443 | sun4c_flush_page((unsigned int) &_start); |
444 | sun4c_put_pte(((unsigned long) &_start), | |
445 | (sun4c_get_pte((unsigned long) &_start) | _SUN4C_PAGE_NOCACHE)); | |
1da177e4 LT |
446 | } |
447 | } | |
448 | ||
449 | /* Addr is always aligned on a page boundary for us already. */ | |
4b1c5df2 DM |
450 | static int sun4c_map_dma_area(struct device *dev, dma_addr_t *pba, unsigned long va, |
451 | unsigned long addr, int len) | |
1da177e4 LT |
452 | { |
453 | unsigned long page, end; | |
454 | ||
455 | *pba = addr; | |
456 | ||
457 | end = PAGE_ALIGN((addr + len)); | |
458 | while (addr < end) { | |
459 | page = va; | |
460 | sun4c_flush_page(page); | |
461 | page -= PAGE_OFFSET; | |
462 | page >>= PAGE_SHIFT; | |
463 | page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY | | |
464 | _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV); | |
465 | sun4c_put_pte(addr, page); | |
466 | addr += PAGE_SIZE; | |
467 | va += PAGE_SIZE; | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
4b1c5df2 | 473 | static void sun4c_unmap_dma_area(struct device *dev, unsigned long busa, int len) |
1da177e4 LT |
474 | { |
475 | /* Fortunately for us, bus_addr == uncached_virt in sun4c. */ | |
476 | /* XXX Implement this */ | |
477 | } | |
478 | ||
479 | /* TLB management. */ | |
480 | ||
481 | /* Don't change this struct without changing entry.S. This is used | |
482 | * in the in-window kernel fault handler, and you don't want to mess | |
483 | * with that. (See sun4c_fault in entry.S). | |
484 | */ | |
485 | struct sun4c_mmu_entry { | |
486 | struct sun4c_mmu_entry *next; | |
487 | struct sun4c_mmu_entry *prev; | |
488 | unsigned long vaddr; | |
489 | unsigned char pseg; | |
490 | unsigned char locked; | |
491 | ||
492 | /* For user mappings only, and completely hidden from kernel | |
493 | * TLB miss code. | |
494 | */ | |
495 | unsigned char ctx; | |
496 | struct sun4c_mmu_entry *lru_next; | |
497 | struct sun4c_mmu_entry *lru_prev; | |
498 | }; | |
499 | ||
500 | static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS]; | |
501 | ||
502 | static void __init sun4c_init_mmu_entry_pool(void) | |
503 | { | |
504 | int i; | |
505 | ||
506 | for (i=0; i < SUN4C_MAX_SEGMAPS; i++) { | |
507 | mmu_entry_pool[i].pseg = i; | |
508 | mmu_entry_pool[i].next = NULL; | |
509 | mmu_entry_pool[i].prev = NULL; | |
510 | mmu_entry_pool[i].vaddr = 0; | |
511 | mmu_entry_pool[i].locked = 0; | |
512 | mmu_entry_pool[i].ctx = 0; | |
513 | mmu_entry_pool[i].lru_next = NULL; | |
514 | mmu_entry_pool[i].lru_prev = NULL; | |
515 | } | |
516 | mmu_entry_pool[invalid_segment].locked = 1; | |
517 | } | |
518 | ||
519 | static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on, | |
520 | unsigned long bits_off) | |
521 | { | |
522 | unsigned long start, end; | |
523 | ||
524 | end = vaddr + SUN4C_REAL_PGDIR_SIZE; | |
525 | for (start = vaddr; start < end; start += PAGE_SIZE) | |
526 | if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID) | |
527 | sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) & | |
528 | ~bits_off); | |
529 | } | |
530 | ||
531 | static inline void sun4c_init_map_kernelprom(unsigned long kernel_end) | |
532 | { | |
533 | unsigned long vaddr; | |
534 | unsigned char pseg, ctx; | |
5110bd21 | 535 | |
1da177e4 LT |
536 | for (vaddr = KADB_DEBUGGER_BEGVM; |
537 | vaddr < LINUX_OPPROM_ENDVM; | |
538 | vaddr += SUN4C_REAL_PGDIR_SIZE) { | |
539 | pseg = sun4c_get_segmap(vaddr); | |
540 | if (pseg != invalid_segment) { | |
541 | mmu_entry_pool[pseg].locked = 1; | |
542 | for (ctx = 0; ctx < num_contexts; ctx++) | |
543 | prom_putsegment(ctx, vaddr, pseg); | |
544 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0); | |
545 | } | |
546 | } | |
5110bd21 | 547 | |
1da177e4 LT |
548 | for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) { |
549 | pseg = sun4c_get_segmap(vaddr); | |
550 | mmu_entry_pool[pseg].locked = 1; | |
551 | for (ctx = 0; ctx < num_contexts; ctx++) | |
552 | prom_putsegment(ctx, vaddr, pseg); | |
553 | fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE); | |
554 | } | |
555 | } | |
556 | ||
557 | static void __init sun4c_init_lock_area(unsigned long start, unsigned long end) | |
558 | { | |
559 | int i, ctx; | |
560 | ||
561 | while (start < end) { | |
562 | for (i = 0; i < invalid_segment; i++) | |
563 | if (!mmu_entry_pool[i].locked) | |
564 | break; | |
565 | mmu_entry_pool[i].locked = 1; | |
566 | sun4c_init_clean_segmap(i); | |
567 | for (ctx = 0; ctx < num_contexts; ctx++) | |
568 | prom_putsegment(ctx, start, mmu_entry_pool[i].pseg); | |
569 | start += SUN4C_REAL_PGDIR_SIZE; | |
570 | } | |
571 | } | |
572 | ||
573 | /* Don't change this struct without changing entry.S. This is used | |
574 | * in the in-window kernel fault handler, and you don't want to mess | |
575 | * with that. (See sun4c_fault in entry.S). | |
576 | */ | |
577 | struct sun4c_mmu_ring { | |
578 | struct sun4c_mmu_entry ringhd; | |
579 | int num_entries; | |
580 | }; | |
581 | ||
582 | static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */ | |
583 | static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */ | |
584 | static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */ | |
585 | struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */ | |
586 | struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */ | |
587 | ||
588 | static inline void sun4c_init_rings(void) | |
589 | { | |
590 | int i; | |
591 | ||
592 | for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) { | |
593 | sun4c_context_ring[i].ringhd.next = | |
594 | sun4c_context_ring[i].ringhd.prev = | |
595 | &sun4c_context_ring[i].ringhd; | |
596 | sun4c_context_ring[i].num_entries = 0; | |
597 | } | |
598 | sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev = | |
599 | &sun4c_ufree_ring.ringhd; | |
600 | sun4c_ufree_ring.num_entries = 0; | |
601 | sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev = | |
602 | &sun4c_ulru_ring.ringhd; | |
603 | sun4c_ulru_ring.num_entries = 0; | |
604 | sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev = | |
605 | &sun4c_kernel_ring.ringhd; | |
606 | sun4c_kernel_ring.num_entries = 0; | |
607 | sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev = | |
608 | &sun4c_kfree_ring.ringhd; | |
609 | sun4c_kfree_ring.num_entries = 0; | |
610 | } | |
611 | ||
612 | static void add_ring(struct sun4c_mmu_ring *ring, | |
613 | struct sun4c_mmu_entry *entry) | |
614 | { | |
615 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
616 | ||
617 | entry->prev = head; | |
618 | (entry->next = head->next)->prev = entry; | |
619 | head->next = entry; | |
620 | ring->num_entries++; | |
621 | } | |
622 | ||
64d329ee | 623 | static inline void add_lru(struct sun4c_mmu_entry *entry) |
1da177e4 LT |
624 | { |
625 | struct sun4c_mmu_ring *ring = &sun4c_ulru_ring; | |
626 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
627 | ||
628 | entry->lru_next = head; | |
629 | (entry->lru_prev = head->lru_prev)->lru_next = entry; | |
630 | head->lru_prev = entry; | |
631 | } | |
632 | ||
633 | static void add_ring_ordered(struct sun4c_mmu_ring *ring, | |
634 | struct sun4c_mmu_entry *entry) | |
635 | { | |
636 | struct sun4c_mmu_entry *head = &ring->ringhd; | |
637 | unsigned long addr = entry->vaddr; | |
638 | ||
639 | while ((head->next != &ring->ringhd) && (head->next->vaddr < addr)) | |
640 | head = head->next; | |
641 | ||
642 | entry->prev = head; | |
643 | (entry->next = head->next)->prev = entry; | |
644 | head->next = entry; | |
645 | ring->num_entries++; | |
646 | ||
647 | add_lru(entry); | |
648 | } | |
649 | ||
64d329ee | 650 | static inline void remove_ring(struct sun4c_mmu_ring *ring, |
1da177e4 LT |
651 | struct sun4c_mmu_entry *entry) |
652 | { | |
653 | struct sun4c_mmu_entry *next = entry->next; | |
654 | ||
655 | (next->prev = entry->prev)->next = next; | |
656 | ring->num_entries--; | |
657 | } | |
658 | ||
659 | static void remove_lru(struct sun4c_mmu_entry *entry) | |
660 | { | |
661 | struct sun4c_mmu_entry *next = entry->lru_next; | |
662 | ||
663 | (next->lru_prev = entry->lru_prev)->lru_next = next; | |
664 | } | |
665 | ||
666 | static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry) | |
667 | { | |
668 | remove_ring(sun4c_context_ring+ctx, entry); | |
669 | remove_lru(entry); | |
670 | add_ring(&sun4c_ufree_ring, entry); | |
671 | } | |
672 | ||
673 | static void free_kernel_entry(struct sun4c_mmu_entry *entry, | |
674 | struct sun4c_mmu_ring *ring) | |
675 | { | |
676 | remove_ring(ring, entry); | |
677 | add_ring(&sun4c_kfree_ring, entry); | |
678 | } | |
679 | ||
680 | static void __init sun4c_init_fill_kernel_ring(int howmany) | |
681 | { | |
682 | int i; | |
683 | ||
684 | while (howmany) { | |
685 | for (i = 0; i < invalid_segment; i++) | |
686 | if (!mmu_entry_pool[i].locked) | |
687 | break; | |
688 | mmu_entry_pool[i].locked = 1; | |
689 | sun4c_init_clean_segmap(i); | |
690 | add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]); | |
691 | howmany--; | |
692 | } | |
693 | } | |
694 | ||
695 | static void __init sun4c_init_fill_user_ring(void) | |
696 | { | |
697 | int i; | |
698 | ||
699 | for (i = 0; i < invalid_segment; i++) { | |
700 | if (mmu_entry_pool[i].locked) | |
701 | continue; | |
702 | sun4c_init_clean_segmap(i); | |
703 | add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]); | |
704 | } | |
705 | } | |
706 | ||
707 | static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry) | |
708 | { | |
709 | int savectx, ctx; | |
710 | ||
711 | savectx = sun4c_get_context(); | |
712 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
713 | sun4c_set_context(ctx); | |
714 | sun4c_put_segmap(kentry->vaddr, invalid_segment); | |
715 | } | |
716 | sun4c_set_context(savectx); | |
717 | } | |
718 | ||
719 | static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry) | |
720 | { | |
721 | int savectx, ctx; | |
722 | ||
723 | savectx = sun4c_get_context(); | |
724 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
725 | sun4c_set_context(ctx); | |
726 | sun4c_put_segmap(kentry->vaddr, kentry->pseg); | |
727 | } | |
728 | sun4c_set_context(savectx); | |
729 | } | |
730 | ||
731 | #define sun4c_user_unmap(__entry) \ | |
732 | sun4c_put_segmap((__entry)->vaddr, invalid_segment) | |
733 | ||
734 | static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx) | |
735 | { | |
736 | struct sun4c_mmu_entry *head = &crp->ringhd; | |
737 | unsigned long flags; | |
738 | ||
739 | local_irq_save(flags); | |
740 | if (head->next != head) { | |
741 | struct sun4c_mmu_entry *entry = head->next; | |
742 | int savectx = sun4c_get_context(); | |
743 | ||
744 | flush_user_windows(); | |
745 | sun4c_set_context(ctx); | |
746 | sun4c_flush_context(); | |
747 | do { | |
748 | struct sun4c_mmu_entry *next = entry->next; | |
749 | ||
750 | sun4c_user_unmap(entry); | |
751 | free_user_entry(ctx, entry); | |
752 | ||
753 | entry = next; | |
754 | } while (entry != head); | |
755 | sun4c_set_context(savectx); | |
756 | } | |
757 | local_irq_restore(flags); | |
758 | } | |
759 | ||
760 | static int sun4c_user_taken_entries; /* This is how much we have. */ | |
761 | static int max_user_taken_entries; /* This limits us and prevents deadlock. */ | |
762 | ||
763 | static struct sun4c_mmu_entry *sun4c_kernel_strategy(void) | |
764 | { | |
765 | struct sun4c_mmu_entry *this_entry; | |
766 | ||
767 | /* If some are free, return first one. */ | |
768 | if (sun4c_kfree_ring.num_entries) { | |
769 | this_entry = sun4c_kfree_ring.ringhd.next; | |
770 | return this_entry; | |
771 | } | |
772 | ||
773 | /* Else free one up. */ | |
774 | this_entry = sun4c_kernel_ring.ringhd.prev; | |
775 | sun4c_flush_segment(this_entry->vaddr); | |
776 | sun4c_kernel_unmap(this_entry); | |
777 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
778 | this_entry = sun4c_kfree_ring.ringhd.next; | |
779 | ||
780 | return this_entry; | |
781 | } | |
782 | ||
783 | /* Using this method to free up mmu entries eliminates a lot of | |
784 | * potential races since we have a kernel that incurs tlb | |
785 | * replacement faults. There may be performance penalties. | |
786 | * | |
787 | * NOTE: Must be called with interrupts disabled. | |
788 | */ | |
789 | static struct sun4c_mmu_entry *sun4c_user_strategy(void) | |
790 | { | |
791 | struct sun4c_mmu_entry *entry; | |
792 | unsigned char ctx; | |
793 | int savectx; | |
794 | ||
795 | /* If some are free, return first one. */ | |
796 | if (sun4c_ufree_ring.num_entries) { | |
797 | entry = sun4c_ufree_ring.ringhd.next; | |
798 | goto unlink_out; | |
799 | } | |
800 | ||
801 | if (sun4c_user_taken_entries) { | |
802 | entry = sun4c_kernel_strategy(); | |
803 | sun4c_user_taken_entries--; | |
804 | goto kunlink_out; | |
805 | } | |
806 | ||
807 | /* Grab from the beginning of the LRU list. */ | |
808 | entry = sun4c_ulru_ring.ringhd.lru_next; | |
809 | ctx = entry->ctx; | |
810 | ||
811 | savectx = sun4c_get_context(); | |
812 | flush_user_windows(); | |
813 | sun4c_set_context(ctx); | |
814 | sun4c_flush_segment(entry->vaddr); | |
815 | sun4c_user_unmap(entry); | |
816 | remove_ring(sun4c_context_ring + ctx, entry); | |
817 | remove_lru(entry); | |
818 | sun4c_set_context(savectx); | |
819 | ||
820 | return entry; | |
821 | ||
822 | unlink_out: | |
823 | remove_ring(&sun4c_ufree_ring, entry); | |
824 | return entry; | |
825 | kunlink_out: | |
826 | remove_ring(&sun4c_kfree_ring, entry); | |
827 | return entry; | |
828 | } | |
829 | ||
830 | /* NOTE: Must be called with interrupts disabled. */ | |
831 | void sun4c_grow_kernel_ring(void) | |
832 | { | |
833 | struct sun4c_mmu_entry *entry; | |
834 | ||
835 | /* Prevent deadlock condition. */ | |
836 | if (sun4c_user_taken_entries >= max_user_taken_entries) | |
837 | return; | |
838 | ||
839 | if (sun4c_ufree_ring.num_entries) { | |
840 | entry = sun4c_ufree_ring.ringhd.next; | |
841 | remove_ring(&sun4c_ufree_ring, entry); | |
842 | add_ring(&sun4c_kfree_ring, entry); | |
843 | sun4c_user_taken_entries++; | |
844 | } | |
845 | } | |
846 | ||
847 | /* 2 page buckets for task struct and kernel stack allocation. | |
848 | * | |
849 | * TASK_STACK_BEGIN | |
850 | * bucket[0] | |
851 | * bucket[1] | |
852 | * [ ... ] | |
853 | * bucket[NR_TASK_BUCKETS-1] | |
854 | * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS) | |
855 | * | |
856 | * Each slot looks like: | |
857 | * | |
858 | * page 1 -- task struct + beginning of kernel stack | |
859 | * page 2 -- rest of kernel stack | |
860 | */ | |
861 | ||
862 | union task_union *sun4c_bucket[NR_TASK_BUCKETS]; | |
863 | ||
864 | static int sun4c_lowbucket_avail; | |
865 | ||
866 | #define BUCKET_EMPTY ((union task_union *) 0) | |
867 | #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */ | |
868 | #define BUCKET_SIZE (1 << BUCKET_SHIFT) | |
869 | #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT)) | |
870 | #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR) | |
871 | #define BUCKET_PTE(page) \ | |
872 | ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL)) | |
873 | #define BUCKET_PTE_PAGE(pte) \ | |
874 | (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT)) | |
875 | ||
876 | static void get_locked_segment(unsigned long addr) | |
877 | { | |
878 | struct sun4c_mmu_entry *stolen; | |
879 | unsigned long flags; | |
880 | ||
881 | local_irq_save(flags); | |
882 | addr &= SUN4C_REAL_PGDIR_MASK; | |
883 | stolen = sun4c_user_strategy(); | |
884 | max_user_taken_entries--; | |
885 | stolen->vaddr = addr; | |
886 | flush_user_windows(); | |
887 | sun4c_kernel_map(stolen); | |
888 | local_irq_restore(flags); | |
889 | } | |
890 | ||
891 | static void free_locked_segment(unsigned long addr) | |
892 | { | |
893 | struct sun4c_mmu_entry *entry; | |
894 | unsigned long flags; | |
895 | unsigned char pseg; | |
896 | ||
897 | local_irq_save(flags); | |
898 | addr &= SUN4C_REAL_PGDIR_MASK; | |
899 | pseg = sun4c_get_segmap(addr); | |
900 | entry = &mmu_entry_pool[pseg]; | |
901 | ||
902 | flush_user_windows(); | |
903 | sun4c_flush_segment(addr); | |
904 | sun4c_kernel_unmap(entry); | |
905 | add_ring(&sun4c_ufree_ring, entry); | |
906 | max_user_taken_entries++; | |
907 | local_irq_restore(flags); | |
908 | } | |
909 | ||
910 | static inline void garbage_collect(int entry) | |
911 | { | |
912 | int start, end; | |
913 | ||
914 | /* 32 buckets per segment... */ | |
915 | entry &= ~31; | |
916 | start = entry; | |
917 | for (end = (start + 32); start < end; start++) | |
918 | if (sun4c_bucket[start] != BUCKET_EMPTY) | |
919 | return; | |
920 | ||
921 | /* Entire segment empty, release it. */ | |
922 | free_locked_segment(BUCKET_ADDR(entry)); | |
923 | } | |
924 | ||
925 | static struct thread_info *sun4c_alloc_thread_info(void) | |
926 | { | |
927 | unsigned long addr, pages; | |
928 | int entry; | |
929 | ||
930 | pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER); | |
931 | if (!pages) | |
932 | return NULL; | |
933 | ||
934 | for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++) | |
935 | if (sun4c_bucket[entry] == BUCKET_EMPTY) | |
936 | break; | |
937 | if (entry == NR_TASK_BUCKETS) { | |
938 | free_pages(pages, THREAD_INFO_ORDER); | |
939 | return NULL; | |
940 | } | |
941 | if (entry >= sun4c_lowbucket_avail) | |
942 | sun4c_lowbucket_avail = entry + 1; | |
943 | ||
944 | addr = BUCKET_ADDR(entry); | |
945 | sun4c_bucket[entry] = (union task_union *) addr; | |
946 | if(sun4c_get_segmap(addr) == invalid_segment) | |
947 | get_locked_segment(addr); | |
948 | ||
949 | /* We are changing the virtual color of the page(s) | |
950 | * so we must flush the cache to guarantee consistency. | |
951 | */ | |
952 | sun4c_flush_page(pages); | |
1da177e4 | 953 | sun4c_flush_page(pages + PAGE_SIZE); |
1da177e4 LT |
954 | |
955 | sun4c_put_pte(addr, BUCKET_PTE(pages)); | |
1da177e4 | 956 | sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE)); |
1da177e4 LT |
957 | |
958 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
959 | memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER); | |
960 | #endif /* DEBUG_STACK_USAGE */ | |
961 | ||
962 | return (struct thread_info *) addr; | |
963 | } | |
964 | ||
965 | static void sun4c_free_thread_info(struct thread_info *ti) | |
966 | { | |
967 | unsigned long tiaddr = (unsigned long) ti; | |
968 | unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr)); | |
969 | int entry = BUCKET_NUM(tiaddr); | |
970 | ||
971 | /* We are deleting a mapping, so the flush here is mandatory. */ | |
972 | sun4c_flush_page(tiaddr); | |
1da177e4 | 973 | sun4c_flush_page(tiaddr + PAGE_SIZE); |
5110bd21 | 974 | |
1da177e4 | 975 | sun4c_put_pte(tiaddr, 0); |
1da177e4 | 976 | sun4c_put_pte(tiaddr + PAGE_SIZE, 0); |
5110bd21 | 977 | |
1da177e4 LT |
978 | sun4c_bucket[entry] = BUCKET_EMPTY; |
979 | if (entry < sun4c_lowbucket_avail) | |
980 | sun4c_lowbucket_avail = entry; | |
981 | ||
982 | free_pages(pages, THREAD_INFO_ORDER); | |
983 | garbage_collect(entry); | |
984 | } | |
985 | ||
986 | static void __init sun4c_init_buckets(void) | |
987 | { | |
988 | int entry; | |
989 | ||
990 | if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) { | |
991 | extern void thread_info_size_is_bolixed_pete(void); | |
992 | thread_info_size_is_bolixed_pete(); | |
993 | } | |
994 | ||
995 | for (entry = 0; entry < NR_TASK_BUCKETS; entry++) | |
996 | sun4c_bucket[entry] = BUCKET_EMPTY; | |
997 | sun4c_lowbucket_avail = 0; | |
998 | } | |
999 | ||
1000 | static unsigned long sun4c_iobuffer_start; | |
1001 | static unsigned long sun4c_iobuffer_end; | |
1002 | static unsigned long sun4c_iobuffer_high; | |
1003 | static unsigned long *sun4c_iobuffer_map; | |
1004 | static int iobuffer_map_size; | |
1005 | ||
1006 | /* | |
1007 | * Alias our pages so they do not cause a trap. | |
1008 | * Also one page may be aliased into several I/O areas and we may | |
1009 | * finish these I/O separately. | |
1010 | */ | |
1011 | static char *sun4c_lockarea(char *vaddr, unsigned long size) | |
1012 | { | |
1013 | unsigned long base, scan; | |
1014 | unsigned long npages; | |
1015 | unsigned long vpage; | |
1016 | unsigned long pte; | |
1017 | unsigned long apage; | |
1018 | unsigned long high; | |
1019 | unsigned long flags; | |
1020 | ||
1021 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1022 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1023 | ||
1da177e4 | 1024 | local_irq_save(flags); |
e756fd80 AM |
1025 | base = bitmap_find_next_zero_area(sun4c_iobuffer_map, iobuffer_map_size, |
1026 | 0, npages, 0); | |
1027 | if (base >= iobuffer_map_size) | |
1028 | goto abend; | |
1da177e4 | 1029 | |
1da177e4 LT |
1030 | high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start; |
1031 | high = SUN4C_REAL_PGDIR_ALIGN(high); | |
1032 | while (high > sun4c_iobuffer_high) { | |
1033 | get_locked_segment(sun4c_iobuffer_high); | |
1034 | sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE; | |
1035 | } | |
1036 | ||
1037 | vpage = ((unsigned long) vaddr) & PAGE_MASK; | |
1038 | for (scan = base; scan < base+npages; scan++) { | |
1039 | pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT); | |
1040 | pte |= pgprot_val(SUN4C_PAGE_KERNEL); | |
1041 | pte |= _SUN4C_PAGE_NOCACHE; | |
1042 | set_bit(scan, sun4c_iobuffer_map); | |
1043 | apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start; | |
1044 | ||
1045 | /* Flush original mapping so we see the right things later. */ | |
1046 | sun4c_flush_page(vpage); | |
1047 | ||
1048 | sun4c_put_pte(apage, pte); | |
1049 | vpage += PAGE_SIZE; | |
1050 | } | |
1051 | local_irq_restore(flags); | |
1052 | return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start + | |
1053 | (((unsigned long) vaddr) & ~PAGE_MASK)); | |
1054 | ||
1055 | abend: | |
1056 | local_irq_restore(flags); | |
1057 | printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size); | |
1058 | panic("Out of iobuffer table"); | |
1059 | return NULL; | |
1060 | } | |
1061 | ||
1062 | static void sun4c_unlockarea(char *vaddr, unsigned long size) | |
1063 | { | |
1064 | unsigned long vpage, npages; | |
1065 | unsigned long flags; | |
1066 | int scan, high; | |
1067 | ||
1068 | vpage = (unsigned long)vaddr & PAGE_MASK; | |
1069 | npages = (((unsigned long)vaddr & ~PAGE_MASK) + | |
1070 | size + (PAGE_SIZE-1)) >> PAGE_SHIFT; | |
1071 | ||
1072 | local_irq_save(flags); | |
1073 | while (npages != 0) { | |
1074 | --npages; | |
1075 | ||
1076 | /* This mapping is marked non-cachable, no flush necessary. */ | |
1077 | sun4c_put_pte(vpage, 0); | |
1078 | clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT, | |
1079 | sun4c_iobuffer_map); | |
1080 | vpage += PAGE_SIZE; | |
1081 | } | |
1082 | ||
1083 | /* garbage collect */ | |
1084 | scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1085 | while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5]) | |
1086 | scan -= 32; | |
1087 | scan += 32; | |
1088 | high = sun4c_iobuffer_start + (scan << PAGE_SHIFT); | |
1089 | high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE; | |
1090 | while (high < sun4c_iobuffer_high) { | |
1091 | sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE; | |
1092 | free_locked_segment(sun4c_iobuffer_high); | |
1093 | } | |
1094 | local_irq_restore(flags); | |
1095 | } | |
1096 | ||
1097 | /* Note the scsi code at init time passes to here buffers | |
1098 | * which sit on the kernel stack, those are already locked | |
1099 | * by implication and fool the page locking code above | |
1100 | * if passed to by mistake. | |
1101 | */ | |
9723f38e | 1102 | static __u32 sun4c_get_scsi_one(struct device *dev, char *bufptr, unsigned long len) |
1da177e4 LT |
1103 | { |
1104 | unsigned long page; | |
1105 | ||
1106 | page = ((unsigned long)bufptr) & PAGE_MASK; | |
1107 | if (!virt_addr_valid(page)) { | |
1108 | sun4c_flush_page(page); | |
1109 | return (__u32)bufptr; /* already locked */ | |
1110 | } | |
1111 | return (__u32)sun4c_lockarea(bufptr, len); | |
1112 | } | |
1113 | ||
9723f38e | 1114 | static void sun4c_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
1da177e4 LT |
1115 | { |
1116 | while (sz != 0) { | |
1117 | --sz; | |
aa83a26a RR |
1118 | sg->dma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length); |
1119 | sg->dma_length = sg->length; | |
0912a5db | 1120 | sg = sg_next(sg); |
1da177e4 LT |
1121 | } |
1122 | } | |
1123 | ||
9723f38e | 1124 | static void sun4c_release_scsi_one(struct device *dev, __u32 bufptr, unsigned long len) |
1da177e4 LT |
1125 | { |
1126 | if (bufptr < sun4c_iobuffer_start) | |
1127 | return; /* On kernel stack or similar, see above */ | |
1128 | sun4c_unlockarea((char *)bufptr, len); | |
1129 | } | |
1130 | ||
9723f38e | 1131 | static void sun4c_release_scsi_sgl(struct device *dev, struct scatterlist *sg, int sz) |
1da177e4 LT |
1132 | { |
1133 | while (sz != 0) { | |
1134 | --sz; | |
aa83a26a | 1135 | sun4c_unlockarea((char *)sg->dma_address, sg->length); |
0912a5db | 1136 | sg = sg_next(sg); |
1da177e4 LT |
1137 | } |
1138 | } | |
1139 | ||
1140 | #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */ | |
1141 | #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1)) | |
1142 | ||
1143 | struct vm_area_struct sun4c_kstack_vma; | |
1144 | ||
1145 | static void __init sun4c_init_lock_areas(void) | |
1146 | { | |
1147 | unsigned long sun4c_taskstack_start; | |
1148 | unsigned long sun4c_taskstack_end; | |
1149 | int bitmap_size; | |
1150 | ||
1151 | sun4c_init_buckets(); | |
1152 | sun4c_taskstack_start = SUN4C_LOCK_VADDR; | |
1153 | sun4c_taskstack_end = (sun4c_taskstack_start + | |
1154 | (TASK_ENTRY_SIZE * NR_TASK_BUCKETS)); | |
1155 | if (sun4c_taskstack_end >= SUN4C_LOCK_END) { | |
1156 | prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n"); | |
1157 | prom_halt(); | |
1158 | } | |
1159 | ||
1160 | sun4c_iobuffer_start = sun4c_iobuffer_high = | |
1161 | SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end); | |
1162 | sun4c_iobuffer_end = SUN4C_LOCK_END; | |
1163 | bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT; | |
1164 | bitmap_size = (bitmap_size + 7) >> 3; | |
1165 | bitmap_size = LONG_ALIGN(bitmap_size); | |
1166 | iobuffer_map_size = bitmap_size << 3; | |
1167 | sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL); | |
1168 | memset((void *) sun4c_iobuffer_map, 0, bitmap_size); | |
1169 | ||
1170 | sun4c_kstack_vma.vm_mm = &init_mm; | |
1171 | sun4c_kstack_vma.vm_start = sun4c_taskstack_start; | |
1172 | sun4c_kstack_vma.vm_end = sun4c_taskstack_end; | |
1173 | sun4c_kstack_vma.vm_page_prot = PAGE_SHARED; | |
1174 | sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC; | |
1175 | insert_vm_struct(&init_mm, &sun4c_kstack_vma); | |
1176 | } | |
1177 | ||
1178 | /* Cache flushing on the sun4c. */ | |
1179 | static void sun4c_flush_cache_all(void) | |
1180 | { | |
1181 | unsigned long begin, end; | |
1182 | ||
1183 | flush_user_windows(); | |
1184 | begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE); | |
1185 | end = (begin + SUN4C_VAC_SIZE); | |
1186 | ||
1187 | if (sun4c_vacinfo.linesize == 32) { | |
1188 | while (begin < end) { | |
1189 | __asm__ __volatile__( | |
1190 | "ld [%0 + 0x00], %%g0\n\t" | |
1191 | "ld [%0 + 0x20], %%g0\n\t" | |
1192 | "ld [%0 + 0x40], %%g0\n\t" | |
1193 | "ld [%0 + 0x60], %%g0\n\t" | |
1194 | "ld [%0 + 0x80], %%g0\n\t" | |
1195 | "ld [%0 + 0xa0], %%g0\n\t" | |
1196 | "ld [%0 + 0xc0], %%g0\n\t" | |
1197 | "ld [%0 + 0xe0], %%g0\n\t" | |
1198 | "ld [%0 + 0x100], %%g0\n\t" | |
1199 | "ld [%0 + 0x120], %%g0\n\t" | |
1200 | "ld [%0 + 0x140], %%g0\n\t" | |
1201 | "ld [%0 + 0x160], %%g0\n\t" | |
1202 | "ld [%0 + 0x180], %%g0\n\t" | |
1203 | "ld [%0 + 0x1a0], %%g0\n\t" | |
1204 | "ld [%0 + 0x1c0], %%g0\n\t" | |
1205 | "ld [%0 + 0x1e0], %%g0\n" | |
1206 | : : "r" (begin)); | |
1207 | begin += 512; | |
1208 | } | |
1209 | } else { | |
1210 | while (begin < end) { | |
1211 | __asm__ __volatile__( | |
1212 | "ld [%0 + 0x00], %%g0\n\t" | |
1213 | "ld [%0 + 0x10], %%g0\n\t" | |
1214 | "ld [%0 + 0x20], %%g0\n\t" | |
1215 | "ld [%0 + 0x30], %%g0\n\t" | |
1216 | "ld [%0 + 0x40], %%g0\n\t" | |
1217 | "ld [%0 + 0x50], %%g0\n\t" | |
1218 | "ld [%0 + 0x60], %%g0\n\t" | |
1219 | "ld [%0 + 0x70], %%g0\n\t" | |
1220 | "ld [%0 + 0x80], %%g0\n\t" | |
1221 | "ld [%0 + 0x90], %%g0\n\t" | |
1222 | "ld [%0 + 0xa0], %%g0\n\t" | |
1223 | "ld [%0 + 0xb0], %%g0\n\t" | |
1224 | "ld [%0 + 0xc0], %%g0\n\t" | |
1225 | "ld [%0 + 0xd0], %%g0\n\t" | |
1226 | "ld [%0 + 0xe0], %%g0\n\t" | |
1227 | "ld [%0 + 0xf0], %%g0\n" | |
1228 | : : "r" (begin)); | |
1229 | begin += 256; | |
1230 | } | |
1231 | } | |
1232 | } | |
1233 | ||
1234 | static void sun4c_flush_cache_mm(struct mm_struct *mm) | |
1235 | { | |
1236 | int new_ctx = mm->context; | |
1237 | ||
1238 | if (new_ctx != NO_CONTEXT) { | |
1239 | flush_user_windows(); | |
1240 | ||
1241 | if (sun4c_context_ring[new_ctx].num_entries) { | |
1242 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1243 | unsigned long flags; | |
1244 | ||
1245 | local_irq_save(flags); | |
1246 | if (head->next != head) { | |
1247 | struct sun4c_mmu_entry *entry = head->next; | |
1248 | int savectx = sun4c_get_context(); | |
1249 | ||
1250 | sun4c_set_context(new_ctx); | |
1251 | sun4c_flush_context(); | |
1252 | do { | |
1253 | struct sun4c_mmu_entry *next = entry->next; | |
1254 | ||
1255 | sun4c_user_unmap(entry); | |
1256 | free_user_entry(new_ctx, entry); | |
1257 | ||
1258 | entry = next; | |
1259 | } while (entry != head); | |
1260 | sun4c_set_context(savectx); | |
1261 | } | |
1262 | local_irq_restore(flags); | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1268 | { | |
1269 | struct mm_struct *mm = vma->vm_mm; | |
1270 | int new_ctx = mm->context; | |
1271 | ||
1272 | if (new_ctx != NO_CONTEXT) { | |
1273 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1274 | struct sun4c_mmu_entry *entry; | |
1275 | unsigned long flags; | |
1276 | ||
1277 | flush_user_windows(); | |
1278 | ||
1279 | local_irq_save(flags); | |
1280 | /* All user segmap chains are ordered on entry->vaddr. */ | |
1281 | for (entry = head->next; | |
1282 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1283 | entry = entry->next) | |
1284 | ; | |
1285 | ||
1286 | /* Tracing various job mixtures showed that this conditional | |
1287 | * only passes ~35% of the time for most worse case situations, | |
1288 | * therefore we avoid all of this gross overhead ~65% of the time. | |
1289 | */ | |
1290 | if ((entry != head) && (entry->vaddr < end)) { | |
1291 | int octx = sun4c_get_context(); | |
1292 | sun4c_set_context(new_ctx); | |
1293 | ||
1294 | /* At this point, always, (start >= entry->vaddr) and | |
1295 | * (entry->vaddr < end), once the latter condition | |
1296 | * ceases to hold, or we hit the end of the list, we | |
1297 | * exit the loop. The ordering of all user allocated | |
1298 | * segmaps makes this all work out so beautifully. | |
1299 | */ | |
1300 | do { | |
1301 | struct sun4c_mmu_entry *next = entry->next; | |
1302 | unsigned long realend; | |
1303 | ||
1304 | /* "realstart" is always >= entry->vaddr */ | |
1305 | realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE; | |
1306 | if (end < realend) | |
1307 | realend = end; | |
1308 | if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) { | |
1309 | unsigned long page = entry->vaddr; | |
1310 | while (page < realend) { | |
1311 | sun4c_flush_page(page); | |
1312 | page += PAGE_SIZE; | |
1313 | } | |
1314 | } else { | |
1315 | sun4c_flush_segment(entry->vaddr); | |
1316 | sun4c_user_unmap(entry); | |
1317 | free_user_entry(new_ctx, entry); | |
1318 | } | |
1319 | entry = next; | |
1320 | } while ((entry != head) && (entry->vaddr < end)); | |
1321 | sun4c_set_context(octx); | |
1322 | } | |
1323 | local_irq_restore(flags); | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
1328 | { | |
1329 | struct mm_struct *mm = vma->vm_mm; | |
1330 | int new_ctx = mm->context; | |
1331 | ||
1332 | /* Sun4c has no separate I/D caches so cannot optimize for non | |
1333 | * text page flushes. | |
1334 | */ | |
1335 | if (new_ctx != NO_CONTEXT) { | |
1336 | int octx = sun4c_get_context(); | |
1337 | unsigned long flags; | |
1338 | ||
1339 | flush_user_windows(); | |
1340 | local_irq_save(flags); | |
1341 | sun4c_set_context(new_ctx); | |
1342 | sun4c_flush_page(page); | |
1343 | sun4c_set_context(octx); | |
1344 | local_irq_restore(flags); | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | static void sun4c_flush_page_to_ram(unsigned long page) | |
1349 | { | |
1350 | unsigned long flags; | |
1351 | ||
1352 | local_irq_save(flags); | |
1353 | sun4c_flush_page(page); | |
1354 | local_irq_restore(flags); | |
1355 | } | |
1356 | ||
1357 | /* Sun4c cache is unified, both instructions and data live there, so | |
1358 | * no need to flush the on-stack instructions for new signal handlers. | |
1359 | */ | |
1360 | static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1361 | { | |
1362 | } | |
1363 | ||
1364 | /* TLB flushing on the sun4c. These routines count on the cache | |
1365 | * flushing code to flush the user register windows so that we need | |
1366 | * not do so when we get here. | |
1367 | */ | |
1368 | ||
1369 | static void sun4c_flush_tlb_all(void) | |
1370 | { | |
1371 | struct sun4c_mmu_entry *this_entry, *next_entry; | |
1372 | unsigned long flags; | |
1373 | int savectx, ctx; | |
1374 | ||
1375 | local_irq_save(flags); | |
1376 | this_entry = sun4c_kernel_ring.ringhd.next; | |
1377 | savectx = sun4c_get_context(); | |
1378 | flush_user_windows(); | |
1379 | while (sun4c_kernel_ring.num_entries) { | |
1380 | next_entry = this_entry->next; | |
1381 | sun4c_flush_segment(this_entry->vaddr); | |
1382 | for (ctx = 0; ctx < num_contexts; ctx++) { | |
1383 | sun4c_set_context(ctx); | |
1384 | sun4c_put_segmap(this_entry->vaddr, invalid_segment); | |
1385 | } | |
1386 | free_kernel_entry(this_entry, &sun4c_kernel_ring); | |
1387 | this_entry = next_entry; | |
1388 | } | |
1389 | sun4c_set_context(savectx); | |
1390 | local_irq_restore(flags); | |
1391 | } | |
1392 | ||
1393 | static void sun4c_flush_tlb_mm(struct mm_struct *mm) | |
1394 | { | |
1395 | int new_ctx = mm->context; | |
1396 | ||
1397 | if (new_ctx != NO_CONTEXT) { | |
1398 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1399 | unsigned long flags; | |
1400 | ||
1401 | local_irq_save(flags); | |
1402 | if (head->next != head) { | |
1403 | struct sun4c_mmu_entry *entry = head->next; | |
1404 | int savectx = sun4c_get_context(); | |
1405 | ||
1406 | sun4c_set_context(new_ctx); | |
1407 | sun4c_flush_context(); | |
1408 | do { | |
1409 | struct sun4c_mmu_entry *next = entry->next; | |
1410 | ||
1411 | sun4c_user_unmap(entry); | |
1412 | free_user_entry(new_ctx, entry); | |
1413 | ||
1414 | entry = next; | |
1415 | } while (entry != head); | |
1416 | sun4c_set_context(savectx); | |
1417 | } | |
1418 | local_irq_restore(flags); | |
1419 | } | |
1420 | } | |
1421 | ||
1422 | static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1423 | { | |
1424 | struct mm_struct *mm = vma->vm_mm; | |
1425 | int new_ctx = mm->context; | |
1426 | ||
1427 | if (new_ctx != NO_CONTEXT) { | |
1428 | struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd; | |
1429 | struct sun4c_mmu_entry *entry; | |
1430 | unsigned long flags; | |
1431 | ||
1432 | local_irq_save(flags); | |
1433 | /* See commentary in sun4c_flush_cache_range(). */ | |
1434 | for (entry = head->next; | |
1435 | (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start); | |
1436 | entry = entry->next) | |
1437 | ; | |
1438 | ||
1439 | if ((entry != head) && (entry->vaddr < end)) { | |
1440 | int octx = sun4c_get_context(); | |
1441 | ||
1442 | sun4c_set_context(new_ctx); | |
1443 | do { | |
1444 | struct sun4c_mmu_entry *next = entry->next; | |
1445 | ||
1446 | sun4c_flush_segment(entry->vaddr); | |
1447 | sun4c_user_unmap(entry); | |
1448 | free_user_entry(new_ctx, entry); | |
1449 | ||
1450 | entry = next; | |
1451 | } while ((entry != head) && (entry->vaddr < end)); | |
1452 | sun4c_set_context(octx); | |
1453 | } | |
1454 | local_irq_restore(flags); | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1459 | { | |
1460 | struct mm_struct *mm = vma->vm_mm; | |
1461 | int new_ctx = mm->context; | |
1462 | ||
1463 | if (new_ctx != NO_CONTEXT) { | |
1464 | int savectx = sun4c_get_context(); | |
1465 | unsigned long flags; | |
1466 | ||
1467 | local_irq_save(flags); | |
1468 | sun4c_set_context(new_ctx); | |
1469 | page &= PAGE_MASK; | |
1470 | sun4c_flush_page(page); | |
1471 | sun4c_put_pte(page, 0); | |
1472 | sun4c_set_context(savectx); | |
1473 | local_irq_restore(flags); | |
1474 | } | |
1475 | } | |
1476 | ||
1477 | static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr) | |
1478 | { | |
14778d90 DM |
1479 | unsigned long page_entry, pg_iobits; |
1480 | ||
1481 | pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE | | |
1482 | _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE; | |
1da177e4 LT |
1483 | |
1484 | page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK); | |
1485 | page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT)); | |
1486 | sun4c_put_pte(virt_addr, page_entry); | |
1487 | } | |
1488 | ||
1489 | static void sun4c_mapiorange(unsigned int bus, unsigned long xpa, | |
1490 | unsigned long xva, unsigned int len) | |
1491 | { | |
1492 | while (len != 0) { | |
1493 | len -= PAGE_SIZE; | |
1494 | sun4c_mapioaddr(xpa, xva); | |
1495 | xva += PAGE_SIZE; | |
1496 | xpa += PAGE_SIZE; | |
1497 | } | |
1498 | } | |
1499 | ||
1500 | static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len) | |
1501 | { | |
1502 | while (len != 0) { | |
1503 | len -= PAGE_SIZE; | |
1504 | sun4c_put_pte(virt_addr, 0); | |
1505 | virt_addr += PAGE_SIZE; | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) | |
1510 | { | |
1511 | struct ctx_list *ctxp; | |
1512 | ||
1513 | ctxp = ctx_free.next; | |
1514 | if (ctxp != &ctx_free) { | |
1515 | remove_from_ctx_list(ctxp); | |
1516 | add_to_used_ctxlist(ctxp); | |
1517 | mm->context = ctxp->ctx_number; | |
1518 | ctxp->ctx_mm = mm; | |
1519 | return; | |
1520 | } | |
1521 | ctxp = ctx_used.next; | |
1522 | if (ctxp->ctx_mm == old_mm) | |
1523 | ctxp = ctxp->next; | |
1524 | remove_from_ctx_list(ctxp); | |
1525 | add_to_used_ctxlist(ctxp); | |
1526 | ctxp->ctx_mm->context = NO_CONTEXT; | |
1527 | ctxp->ctx_mm = mm; | |
1528 | mm->context = ctxp->ctx_number; | |
1529 | sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number], | |
1530 | ctxp->ctx_number); | |
1531 | } | |
1532 | ||
1533 | /* Switch the current MM context. */ | |
1534 | static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu) | |
1535 | { | |
1536 | struct ctx_list *ctx; | |
1537 | int dirty = 0; | |
1538 | ||
1539 | if (mm->context == NO_CONTEXT) { | |
1540 | dirty = 1; | |
1541 | sun4c_alloc_context(old_mm, mm); | |
1542 | } else { | |
1543 | /* Update the LRU ring of contexts. */ | |
1544 | ctx = ctx_list_pool + mm->context; | |
1545 | remove_from_ctx_list(ctx); | |
1546 | add_to_used_ctxlist(ctx); | |
1547 | } | |
1548 | if (dirty || old_mm != mm) | |
1549 | sun4c_set_context(mm->context); | |
1550 | } | |
1551 | ||
1552 | static void sun4c_destroy_context(struct mm_struct *mm) | |
1553 | { | |
1554 | struct ctx_list *ctx_old; | |
1555 | ||
1556 | if (mm->context != NO_CONTEXT) { | |
1557 | sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context); | |
1558 | ctx_old = ctx_list_pool + mm->context; | |
1559 | remove_from_ctx_list(ctx_old); | |
1560 | add_to_free_ctxlist(ctx_old); | |
1561 | mm->context = NO_CONTEXT; | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | static void sun4c_mmu_info(struct seq_file *m) | |
1566 | { | |
1567 | int used_user_entries, i; | |
1568 | ||
1569 | used_user_entries = 0; | |
1570 | for (i = 0; i < num_contexts; i++) | |
1571 | used_user_entries += sun4c_context_ring[i].num_entries; | |
1572 | ||
1573 | seq_printf(m, | |
1574 | "vacsize\t\t: %d bytes\n" | |
1575 | "vachwflush\t: %s\n" | |
1576 | "vaclinesize\t: %d bytes\n" | |
1577 | "mmuctxs\t\t: %d\n" | |
1578 | "mmupsegs\t: %d\n" | |
1579 | "kernelpsegs\t: %d\n" | |
1580 | "kfreepsegs\t: %d\n" | |
1581 | "usedpsegs\t: %d\n" | |
1582 | "ufreepsegs\t: %d\n" | |
1583 | "user_taken\t: %d\n" | |
1584 | "max_taken\t: %d\n", | |
1585 | sun4c_vacinfo.num_bytes, | |
1586 | (sun4c_vacinfo.do_hwflushes ? "yes" : "no"), | |
1587 | sun4c_vacinfo.linesize, | |
1588 | num_contexts, | |
1589 | (invalid_segment + 1), | |
1590 | sun4c_kernel_ring.num_entries, | |
1591 | sun4c_kfree_ring.num_entries, | |
1592 | used_user_entries, | |
1593 | sun4c_ufree_ring.num_entries, | |
1594 | sun4c_user_taken_entries, | |
1595 | max_user_taken_entries); | |
1596 | } | |
1597 | ||
1598 | /* Nothing below here should touch the mmu hardware nor the mmu_entry | |
1599 | * data structures. | |
1600 | */ | |
1601 | ||
1602 | /* First the functions which the mid-level code uses to directly | |
1603 | * manipulate the software page tables. Some defines since we are | |
1604 | * emulating the i386 page directory layout. | |
1605 | */ | |
1606 | #define PGD_PRESENT 0x001 | |
1607 | #define PGD_RW 0x002 | |
1608 | #define PGD_USER 0x004 | |
1609 | #define PGD_ACCESSED 0x020 | |
1610 | #define PGD_DIRTY 0x040 | |
1611 | #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY) | |
1612 | ||
1613 | static void sun4c_set_pte(pte_t *ptep, pte_t pte) | |
1614 | { | |
1615 | *ptep = pte; | |
1616 | } | |
1617 | ||
1618 | static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp) | |
1619 | { | |
1620 | } | |
1621 | ||
1622 | static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep) | |
1623 | { | |
1624 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep; | |
1625 | } | |
1626 | ||
1627 | static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep) | |
1628 | { | |
1629 | if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */ | |
1630 | pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep); | |
1631 | } | |
1632 | ||
1633 | static int sun4c_pte_present(pte_t pte) | |
1634 | { | |
1635 | return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0); | |
1636 | } | |
1637 | static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); } | |
1638 | ||
1da177e4 LT |
1639 | static int sun4c_pmd_bad(pmd_t pmd) |
1640 | { | |
1641 | return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) || | |
1642 | (!virt_addr_valid(pmd_val(pmd)))); | |
1643 | } | |
1644 | ||
1645 | static int sun4c_pmd_present(pmd_t pmd) | |
1646 | { | |
1647 | return ((pmd_val(pmd) & PGD_PRESENT) != 0); | |
1648 | } | |
1649 | ||
1650 | #if 0 /* if PMD takes one word */ | |
1651 | static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); } | |
1652 | #else /* if pmd_t is a longish aggregate */ | |
1653 | static void sun4c_pmd_clear(pmd_t *pmdp) { | |
1654 | memset((void *)pmdp, 0, sizeof(pmd_t)); | |
1655 | } | |
1656 | #endif | |
1657 | ||
1658 | static int sun4c_pgd_none(pgd_t pgd) { return 0; } | |
1659 | static int sun4c_pgd_bad(pgd_t pgd) { return 0; } | |
1660 | static int sun4c_pgd_present(pgd_t pgd) { return 1; } | |
1661 | static void sun4c_pgd_clear(pgd_t * pgdp) { } | |
1662 | ||
1663 | /* | |
1664 | * The following only work if pte_present() is true. | |
1665 | * Undefined behaviour if not.. | |
1666 | */ | |
1667 | static pte_t sun4c_pte_mkwrite(pte_t pte) | |
1668 | { | |
1669 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE); | |
1670 | if (pte_val(pte) & _SUN4C_PAGE_MODIFIED) | |
1671 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1672 | return pte; | |
1673 | } | |
1674 | ||
1675 | static pte_t sun4c_pte_mkdirty(pte_t pte) | |
1676 | { | |
1677 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED); | |
1678 | if (pte_val(pte) & _SUN4C_PAGE_WRITE) | |
1679 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE); | |
1680 | return pte; | |
1681 | } | |
1682 | ||
1683 | static pte_t sun4c_pte_mkyoung(pte_t pte) | |
1684 | { | |
1685 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED); | |
1686 | if (pte_val(pte) & _SUN4C_PAGE_READ) | |
1687 | pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ); | |
1688 | return pte; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Conversion functions: convert a page and protection to a page entry, | |
1693 | * and a page entry and page directory to the page they refer to. | |
1694 | */ | |
1695 | static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot) | |
1696 | { | |
1697 | return __pte(page_to_pfn(page) | pgprot_val(pgprot)); | |
1698 | } | |
1699 | ||
1700 | static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot) | |
1701 | { | |
1702 | return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1703 | } | |
1704 | ||
1705 | static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space) | |
1706 | { | |
1707 | return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot)); | |
1708 | } | |
1709 | ||
1710 | static unsigned long sun4c_pte_pfn(pte_t pte) | |
1711 | { | |
1712 | return pte_val(pte) & SUN4C_PFN_MASK; | |
1713 | } | |
1714 | ||
1715 | static pte_t sun4c_pgoff_to_pte(unsigned long pgoff) | |
1716 | { | |
1717 | return __pte(pgoff | _SUN4C_PAGE_FILE); | |
1718 | } | |
1719 | ||
1720 | static unsigned long sun4c_pte_to_pgoff(pte_t pte) | |
1721 | { | |
1722 | return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1); | |
1723 | } | |
1724 | ||
1725 | ||
64d329ee | 1726 | static inline unsigned long sun4c_pmd_page_v(pmd_t pmd) |
1da177e4 LT |
1727 | { |
1728 | return (pmd_val(pmd) & PAGE_MASK); | |
1729 | } | |
1730 | ||
1731 | static struct page *sun4c_pmd_page(pmd_t pmd) | |
1732 | { | |
1733 | return virt_to_page(sun4c_pmd_page_v(pmd)); | |
1734 | } | |
1735 | ||
1736 | static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; } | |
1737 | ||
1738 | /* to find an entry in a page-table-directory */ | |
1739 | static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address) | |
1740 | { | |
1741 | return mm->pgd + (address >> SUN4C_PGDIR_SHIFT); | |
1742 | } | |
1743 | ||
1744 | /* Find an entry in the second-level page table.. */ | |
1745 | static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address) | |
1746 | { | |
1747 | return (pmd_t *) dir; | |
1748 | } | |
1749 | ||
1750 | /* Find an entry in the third-level page table.. */ | |
1751 | pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address) | |
1752 | { | |
1753 | return (pte_t *) sun4c_pmd_page_v(*dir) + | |
1754 | ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1)); | |
1755 | } | |
1756 | ||
1757 | static unsigned long sun4c_swp_type(swp_entry_t entry) | |
1758 | { | |
1759 | return (entry.val & SUN4C_SWP_TYPE_MASK); | |
1760 | } | |
1761 | ||
1762 | static unsigned long sun4c_swp_offset(swp_entry_t entry) | |
1763 | { | |
1764 | return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK; | |
1765 | } | |
1766 | ||
1767 | static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset) | |
1768 | { | |
1769 | return (swp_entry_t) { | |
1770 | (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT | |
1771 | | (type & SUN4C_SWP_TYPE_MASK) }; | |
1772 | } | |
1773 | ||
1774 | static void sun4c_free_pte_slow(pte_t *pte) | |
1775 | { | |
1776 | free_page((unsigned long)pte); | |
1777 | } | |
1778 | ||
1779 | static void sun4c_free_pgd_slow(pgd_t *pgd) | |
1780 | { | |
1781 | free_page((unsigned long)pgd); | |
1782 | } | |
1783 | ||
1784 | static pgd_t *sun4c_get_pgd_fast(void) | |
1785 | { | |
1786 | unsigned long *ret; | |
1787 | ||
1788 | if ((ret = pgd_quicklist) != NULL) { | |
1789 | pgd_quicklist = (unsigned long *)(*ret); | |
1790 | ret[0] = ret[1]; | |
1791 | pgtable_cache_size--; | |
1792 | } else { | |
1793 | pgd_t *init; | |
1794 | ||
1795 | ret = (unsigned long *)__get_free_page(GFP_KERNEL); | |
1796 | memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t)); | |
1797 | init = sun4c_pgd_offset(&init_mm, 0); | |
1798 | memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
1799 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
1800 | } | |
1801 | return (pgd_t *)ret; | |
1802 | } | |
1803 | ||
1804 | static void sun4c_free_pgd_fast(pgd_t *pgd) | |
1805 | { | |
1806 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; | |
1807 | pgd_quicklist = (unsigned long *) pgd; | |
1808 | pgtable_cache_size++; | |
1809 | } | |
1810 | ||
1811 | ||
64d329ee | 1812 | static inline pte_t * |
1da177e4 LT |
1813 | sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address) |
1814 | { | |
1815 | unsigned long *ret; | |
1816 | ||
1817 | if ((ret = (unsigned long *)pte_quicklist) != NULL) { | |
1818 | pte_quicklist = (unsigned long *)(*ret); | |
1819 | ret[0] = ret[1]; | |
1820 | pgtable_cache_size--; | |
1821 | } | |
1822 | return (pte_t *)ret; | |
1823 | } | |
1824 | ||
1825 | static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) | |
1826 | { | |
1827 | pte_t *pte; | |
1828 | ||
1829 | if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL) | |
1830 | return pte; | |
1831 | ||
b3dd5b82 | 1832 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); |
1da177e4 LT |
1833 | return pte; |
1834 | } | |
1835 | ||
2f569afd | 1836 | static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 | 1837 | { |
2f569afd MS |
1838 | pte_t *pte; |
1839 | struct page *page; | |
1840 | ||
1841 | pte = sun4c_pte_alloc_one_kernel(mm, address); | |
1da177e4 LT |
1842 | if (pte == NULL) |
1843 | return NULL; | |
2f569afd MS |
1844 | page = virt_to_page(pte); |
1845 | pgtable_page_ctor(page); | |
1846 | return page; | |
1da177e4 LT |
1847 | } |
1848 | ||
64d329ee | 1849 | static inline void sun4c_free_pte_fast(pte_t *pte) |
1da177e4 LT |
1850 | { |
1851 | *(unsigned long *)pte = (unsigned long) pte_quicklist; | |
1852 | pte_quicklist = (unsigned long *) pte; | |
1853 | pgtable_cache_size++; | |
1854 | } | |
1855 | ||
2f569afd | 1856 | static void sun4c_pte_free(pgtable_t pte) |
1da177e4 | 1857 | { |
2f569afd | 1858 | pgtable_page_dtor(pte); |
1da177e4 LT |
1859 | sun4c_free_pte_fast(page_address(pte)); |
1860 | } | |
1861 | ||
1862 | /* | |
1863 | * allocating and freeing a pmd is trivial: the 1-entry pmd is | |
1864 | * inside the pgd, so has no extra memory associated with it. | |
1865 | */ | |
1866 | static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address) | |
1867 | { | |
1868 | BUG(); | |
1869 | return NULL; | |
1870 | } | |
1871 | ||
1872 | static void sun4c_free_pmd_fast(pmd_t * pmd) { } | |
1873 | ||
1874 | static void sun4c_check_pgt_cache(int low, int high) | |
1875 | { | |
1876 | if (pgtable_cache_size > high) { | |
1877 | do { | |
1878 | if (pgd_quicklist) | |
1879 | sun4c_free_pgd_slow(sun4c_get_pgd_fast()); | |
1880 | if (pte_quicklist) | |
1881 | sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0)); | |
1882 | } while (pgtable_cache_size > low); | |
1883 | } | |
1884 | } | |
1885 | ||
1886 | /* An experiment, turn off by default for now... -DaveM */ | |
1887 | #define SUN4C_PRELOAD_PSEG | |
1888 | ||
4b3073e1 | 1889 | void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) |
1da177e4 LT |
1890 | { |
1891 | unsigned long flags; | |
1892 | int pseg; | |
1893 | ||
da4e9fea MF |
1894 | if (vma->vm_mm->context == NO_CONTEXT) |
1895 | return; | |
1896 | ||
1da177e4 LT |
1897 | local_irq_save(flags); |
1898 | address &= PAGE_MASK; | |
1899 | if ((pseg = sun4c_get_segmap(address)) == invalid_segment) { | |
1900 | struct sun4c_mmu_entry *entry = sun4c_user_strategy(); | |
1901 | struct mm_struct *mm = vma->vm_mm; | |
1902 | unsigned long start, end; | |
1903 | ||
1904 | entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK); | |
1905 | entry->ctx = mm->context; | |
1906 | add_ring_ordered(sun4c_context_ring + mm->context, entry); | |
1907 | sun4c_put_segmap(entry->vaddr, entry->pseg); | |
1908 | end = start + SUN4C_REAL_PGDIR_SIZE; | |
1909 | while (start < end) { | |
1910 | #ifdef SUN4C_PRELOAD_PSEG | |
1911 | pgd_t *pgdp = sun4c_pgd_offset(mm, start); | |
1912 | pte_t *ptep; | |
1913 | ||
1914 | if (!pgdp) | |
1915 | goto no_mapping; | |
1916 | ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start); | |
1917 | if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT)) | |
1918 | goto no_mapping; | |
1919 | sun4c_put_pte(start, pte_val(*ptep)); | |
1920 | goto next; | |
1921 | ||
1922 | no_mapping: | |
1923 | #endif | |
1924 | sun4c_put_pte(start, 0); | |
1925 | #ifdef SUN4C_PRELOAD_PSEG | |
1926 | next: | |
1927 | #endif | |
1928 | start += PAGE_SIZE; | |
1929 | } | |
1930 | #ifndef SUN4C_PRELOAD_PSEG | |
4b3073e1 | 1931 | sun4c_put_pte(address, pte_val(*ptep)); |
1da177e4 LT |
1932 | #endif |
1933 | local_irq_restore(flags); | |
1934 | return; | |
1935 | } else { | |
1936 | struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg]; | |
1937 | ||
1938 | remove_lru(entry); | |
1939 | add_lru(entry); | |
1940 | } | |
1941 | ||
4b3073e1 | 1942 | sun4c_put_pte(address, pte_val(*ptep)); |
1da177e4 LT |
1943 | local_irq_restore(flags); |
1944 | } | |
1945 | ||
1946 | extern void sparc_context_init(int); | |
1da177e4 LT |
1947 | extern unsigned long bootmem_init(unsigned long *pages_avail); |
1948 | extern unsigned long last_valid_pfn; | |
1949 | ||
1950 | void __init sun4c_paging_init(void) | |
1951 | { | |
1952 | int i, cnt; | |
1953 | unsigned long kernel_end, vaddr; | |
1954 | extern struct resource sparc_iomap; | |
1955 | unsigned long end_pfn, pages_avail; | |
1956 | ||
86ed40bd | 1957 | kernel_end = (unsigned long) &_end; |
1da177e4 LT |
1958 | kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end); |
1959 | ||
1960 | pages_avail = 0; | |
1961 | last_valid_pfn = bootmem_init(&pages_avail); | |
1962 | end_pfn = last_valid_pfn; | |
1963 | ||
1964 | sun4c_probe_mmu(); | |
1965 | invalid_segment = (num_segmaps - 1); | |
1966 | sun4c_init_mmu_entry_pool(); | |
1967 | sun4c_init_rings(); | |
1968 | sun4c_init_map_kernelprom(kernel_end); | |
1969 | sun4c_init_clean_mmu(kernel_end); | |
1970 | sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS); | |
1971 | sun4c_init_lock_area(sparc_iomap.start, IOBASE_END); | |
1972 | sun4c_init_lock_area(DVMA_VADDR, DVMA_END); | |
1973 | sun4c_init_lock_areas(); | |
1974 | sun4c_init_fill_user_ring(); | |
1975 | ||
1976 | sun4c_set_context(0); | |
1977 | memset(swapper_pg_dir, 0, PAGE_SIZE); | |
1978 | memset(pg0, 0, PAGE_SIZE); | |
1979 | memset(pg1, 0, PAGE_SIZE); | |
1980 | memset(pg2, 0, PAGE_SIZE); | |
1981 | memset(pg3, 0, PAGE_SIZE); | |
1982 | ||
1983 | /* Save work later. */ | |
1984 | vaddr = VMALLOC_START; | |
1985 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0); | |
1986 | vaddr += SUN4C_PGDIR_SIZE; | |
1987 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1); | |
1988 | vaddr += SUN4C_PGDIR_SIZE; | |
1989 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2); | |
1990 | vaddr += SUN4C_PGDIR_SIZE; | |
1991 | swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3); | |
1992 | sun4c_init_ss2_cache_bug(); | |
1993 | sparc_context_init(num_contexts); | |
1994 | ||
1995 | { | |
1996 | unsigned long zones_size[MAX_NR_ZONES]; | |
1997 | unsigned long zholes_size[MAX_NR_ZONES]; | |
1998 | unsigned long npages; | |
1999 | int znum; | |
2000 | ||
2001 | for (znum = 0; znum < MAX_NR_ZONES; znum++) | |
2002 | zones_size[znum] = zholes_size[znum] = 0; | |
2003 | ||
2004 | npages = max_low_pfn - pfn_base; | |
2005 | ||
2006 | zones_size[ZONE_DMA] = npages; | |
2007 | zholes_size[ZONE_DMA] = npages - pages_avail; | |
2008 | ||
2009 | npages = highend_pfn - max_low_pfn; | |
2010 | zones_size[ZONE_HIGHMEM] = npages; | |
2011 | zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); | |
2012 | ||
9109fb7b | 2013 | free_area_init_node(0, zones_size, pfn_base, zholes_size); |
1da177e4 LT |
2014 | } |
2015 | ||
2016 | cnt = 0; | |
2017 | for (i = 0; i < num_segmaps; i++) | |
2018 | if (mmu_entry_pool[i].locked) | |
2019 | cnt++; | |
2020 | ||
2021 | max_user_taken_entries = num_segmaps - cnt - 40 - 1; | |
2022 | ||
2023 | printk("SUN4C: %d mmu entries for the kernel\n", cnt); | |
2024 | } | |
2025 | ||
14778d90 DM |
2026 | static pgprot_t sun4c_pgprot_noncached(pgprot_t prot) |
2027 | { | |
2028 | prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE); | |
2029 | ||
2030 | return prot; | |
2031 | } | |
2032 | ||
1da177e4 LT |
2033 | /* Load up routines and constants for sun4c mmu */ |
2034 | void __init ld_mmu_sun4c(void) | |
2035 | { | |
2036 | extern void ___xchg32_sun4c(void); | |
2037 | ||
2038 | printk("Loading sun4c MMU routines\n"); | |
2039 | ||
2040 | /* First the constants */ | |
2041 | BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT); | |
2042 | BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE); | |
2043 | BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK); | |
2044 | ||
2045 | BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD); | |
2046 | BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD); | |
2047 | BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE); | |
2048 | ||
2049 | BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE)); | |
378e515c | 2050 | PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED); |
1da177e4 LT |
2051 | BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY)); |
2052 | BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY)); | |
2053 | BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL)); | |
2054 | page_kernel = pgprot_val(SUN4C_PAGE_KERNEL); | |
1da177e4 LT |
2055 | |
2056 | /* Functions */ | |
14778d90 | 2057 | BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM); |
1da177e4 LT |
2058 | BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM); |
2059 | BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM); | |
2060 | ||
2061 | BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM); | |
2062 | ||
2063 | if (sun4c_vacinfo.do_hwflushes) { | |
2064 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM); | |
2065 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM); | |
2066 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM); | |
2067 | } else { | |
2068 | BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM); | |
2069 | BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM); | |
2070 | BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM); | |
2071 | } | |
2072 | ||
2073 | BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM); | |
2074 | BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM); | |
2075 | BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM); | |
2076 | BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM); | |
2077 | BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM); | |
2078 | BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM); | |
2079 | BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM); | |
2080 | BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM); | |
2081 | BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM); | |
2082 | BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM); | |
2083 | ||
2084 | BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP); | |
2085 | ||
2086 | BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0); | |
2087 | ||
1da177e4 LT |
2088 | BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM); |
2089 | #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */ | |
2090 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1)); | |
2091 | #else | |
2092 | BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM); | |
2093 | #endif | |
2094 | BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM); | |
2095 | BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM); | |
2096 | ||
2097 | BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM); | |
2098 | BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0); | |
1da177e4 LT |
2099 | |
2100 | BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM); | |
2101 | BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM); | |
2102 | BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0); | |
2103 | ||
2104 | BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0)); | |
2105 | BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0)); | |
2106 | BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1)); | |
2107 | BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP); | |
2108 | ||
2109 | BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM); | |
2110 | BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM); | |
2111 | BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM); | |
2112 | ||
2113 | BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK); | |
2114 | BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM); | |
2115 | BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM); | |
2116 | BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM); | |
2117 | BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM); | |
2118 | BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM); | |
2119 | BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM); | |
2120 | BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP); | |
2121 | BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0); | |
2122 | BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM); | |
2123 | BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM); | |
2124 | ||
2125 | BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE); | |
2126 | BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED); | |
2127 | BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED); | |
2128 | BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE); | |
2129 | BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE); | |
2130 | BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE); | |
2131 | BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ); | |
2132 | BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM); | |
2133 | BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM); | |
2134 | BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM); | |
2135 | BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM); | |
2136 | ||
2137 | BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM); | |
2138 | BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM); | |
2139 | ||
2140 | BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM); | |
2141 | BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM); | |
2142 | ||
2143 | BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM); | |
2144 | BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM); | |
2145 | BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM); | |
2146 | BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM); | |
2147 | ||
2148 | BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM); | |
2149 | BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM); | |
1da177e4 LT |
2150 | |
2151 | BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM); | |
2152 | BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM); | |
2153 | ||
2154 | BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM); | |
2155 | BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM); | |
2156 | BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM); | |
2157 | ||
2158 | BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM); | |
2159 | BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM); | |
2160 | ||
2161 | BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM); | |
2162 | ||
2163 | /* These should _never_ get called with two level tables. */ | |
2164 | BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP); | |
46a82b2d | 2165 | BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0); |
1da177e4 | 2166 | } |