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1da177e4 LT |
1 | /* |
2 | * linux/arch/parisc/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * Copyright 1999 SuSE GmbH | |
6 | * changed by Philipp Rumpf | |
7 | * Copyright 1999 Philipp Rumpf (prumpf@tux.org) | |
8 | * Copyright 2004 Randolph Chung (tausq@debian.org) | |
a8f44e38 | 9 | * Copyright 2006-2007 Helge Deller (deller@gmx.de) |
1da177e4 LT |
10 | * |
11 | */ | |
12 | ||
1da177e4 LT |
13 | |
14 | #include <linux/module.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/bootmem.h> | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
1da177e4 LT |
18 | #include <linux/delay.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ | |
21 | #include <linux/initrd.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/nodemask.h> /* for node_online_map */ | |
25 | #include <linux/pagemap.h> /* for release_pages and page_cache_release */ | |
26 | ||
27 | #include <asm/pgalloc.h> | |
ce8420bb | 28 | #include <asm/pgtable.h> |
1da177e4 LT |
29 | #include <asm/tlb.h> |
30 | #include <asm/pdc_chassis.h> | |
31 | #include <asm/mmzone.h> | |
a581c2a4 | 32 | #include <asm/sections.h> |
1da177e4 | 33 | |
1da177e4 | 34 | extern int data_start; |
1da177e4 LT |
35 | |
36 | #ifdef CONFIG_DISCONTIGMEM | |
8039de10 | 37 | struct node_map_data node_data[MAX_NUMNODES] __read_mostly; |
8039de10 | 38 | unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; |
1da177e4 LT |
39 | #endif |
40 | ||
41 | static struct resource data_resource = { | |
42 | .name = "Kernel data", | |
43 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
44 | }; | |
45 | ||
46 | static struct resource code_resource = { | |
47 | .name = "Kernel code", | |
48 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
49 | }; | |
50 | ||
51 | static struct resource pdcdata_resource = { | |
52 | .name = "PDC data (Page Zero)", | |
53 | .start = 0, | |
54 | .end = 0x9ff, | |
55 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
56 | }; | |
57 | ||
8039de10 | 58 | static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; |
1da177e4 LT |
59 | |
60 | /* The following array is initialized from the firmware specific | |
61 | * information retrieved in kernel/inventory.c. | |
62 | */ | |
63 | ||
8039de10 HD |
64 | physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; |
65 | int npmem_ranges __read_mostly; | |
1da177e4 | 66 | |
a8f44e38 | 67 | #ifdef CONFIG_64BIT |
1da177e4 | 68 | #define MAX_MEM (~0UL) |
a8f44e38 | 69 | #else /* !CONFIG_64BIT */ |
1da177e4 | 70 | #define MAX_MEM (3584U*1024U*1024U) |
a8f44e38 | 71 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 72 | |
8039de10 | 73 | static unsigned long mem_limit __read_mostly = MAX_MEM; |
1da177e4 LT |
74 | |
75 | static void __init mem_limit_func(void) | |
76 | { | |
77 | char *cp, *end; | |
78 | unsigned long limit; | |
1da177e4 LT |
79 | |
80 | /* We need this before __setup() functions are called */ | |
81 | ||
82 | limit = MAX_MEM; | |
668f9931 | 83 | for (cp = boot_command_line; *cp; ) { |
1da177e4 LT |
84 | if (memcmp(cp, "mem=", 4) == 0) { |
85 | cp += 4; | |
86 | limit = memparse(cp, &end); | |
87 | if (end != cp) | |
88 | break; | |
89 | cp = end; | |
90 | } else { | |
91 | while (*cp != ' ' && *cp) | |
92 | ++cp; | |
93 | while (*cp == ' ') | |
94 | ++cp; | |
95 | } | |
96 | } | |
97 | ||
98 | if (limit < mem_limit) | |
99 | mem_limit = limit; | |
100 | } | |
101 | ||
102 | #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) | |
103 | ||
104 | static void __init setup_bootmem(void) | |
105 | { | |
106 | unsigned long bootmap_size; | |
107 | unsigned long mem_max; | |
108 | unsigned long bootmap_pages; | |
109 | unsigned long bootmap_start_pfn; | |
110 | unsigned long bootmap_pfn; | |
111 | #ifndef CONFIG_DISCONTIGMEM | |
112 | physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; | |
113 | int npmem_holes; | |
114 | #endif | |
115 | int i, sysram_resource_count; | |
116 | ||
117 | disable_sr_hashing(); /* Turn off space register hashing */ | |
118 | ||
119 | /* | |
120 | * Sort the ranges. Since the number of ranges is typically | |
121 | * small, and performance is not an issue here, just do | |
122 | * a simple insertion sort. | |
123 | */ | |
124 | ||
125 | for (i = 1; i < npmem_ranges; i++) { | |
126 | int j; | |
127 | ||
128 | for (j = i; j > 0; j--) { | |
129 | unsigned long tmp; | |
130 | ||
131 | if (pmem_ranges[j-1].start_pfn < | |
132 | pmem_ranges[j].start_pfn) { | |
133 | ||
134 | break; | |
135 | } | |
136 | tmp = pmem_ranges[j-1].start_pfn; | |
137 | pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; | |
138 | pmem_ranges[j].start_pfn = tmp; | |
139 | tmp = pmem_ranges[j-1].pages; | |
140 | pmem_ranges[j-1].pages = pmem_ranges[j].pages; | |
141 | pmem_ranges[j].pages = tmp; | |
142 | } | |
143 | } | |
144 | ||
145 | #ifndef CONFIG_DISCONTIGMEM | |
146 | /* | |
147 | * Throw out ranges that are too far apart (controlled by | |
148 | * MAX_GAP). | |
149 | */ | |
150 | ||
151 | for (i = 1; i < npmem_ranges; i++) { | |
152 | if (pmem_ranges[i].start_pfn - | |
153 | (pmem_ranges[i-1].start_pfn + | |
154 | pmem_ranges[i-1].pages) > MAX_GAP) { | |
155 | npmem_ranges = i; | |
156 | printk("Large gap in memory detected (%ld pages). " | |
157 | "Consider turning on CONFIG_DISCONTIGMEM\n", | |
158 | pmem_ranges[i].start_pfn - | |
159 | (pmem_ranges[i-1].start_pfn + | |
160 | pmem_ranges[i-1].pages)); | |
161 | break; | |
162 | } | |
163 | } | |
164 | #endif | |
165 | ||
166 | if (npmem_ranges > 1) { | |
167 | ||
168 | /* Print the memory ranges */ | |
169 | ||
170 | printk(KERN_INFO "Memory Ranges:\n"); | |
171 | ||
172 | for (i = 0; i < npmem_ranges; i++) { | |
173 | unsigned long start; | |
174 | unsigned long size; | |
175 | ||
176 | size = (pmem_ranges[i].pages << PAGE_SHIFT); | |
177 | start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); | |
178 | printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", | |
179 | i,start, start + (size - 1), size >> 20); | |
180 | } | |
181 | } | |
182 | ||
183 | sysram_resource_count = npmem_ranges; | |
184 | for (i = 0; i < sysram_resource_count; i++) { | |
185 | struct resource *res = &sysram_resources[i]; | |
186 | res->name = "System RAM"; | |
187 | res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; | |
188 | res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; | |
189 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
190 | request_resource(&iomem_resource, res); | |
191 | } | |
192 | ||
193 | /* | |
194 | * For 32 bit kernels we limit the amount of memory we can | |
195 | * support, in order to preserve enough kernel address space | |
196 | * for other purposes. For 64 bit kernels we don't normally | |
197 | * limit the memory, but this mechanism can be used to | |
198 | * artificially limit the amount of memory (and it is written | |
199 | * to work with multiple memory ranges). | |
200 | */ | |
201 | ||
202 | mem_limit_func(); /* check for "mem=" argument */ | |
203 | ||
204 | mem_max = 0; | |
205 | num_physpages = 0; | |
206 | for (i = 0; i < npmem_ranges; i++) { | |
207 | unsigned long rsize; | |
208 | ||
209 | rsize = pmem_ranges[i].pages << PAGE_SHIFT; | |
210 | if ((mem_max + rsize) > mem_limit) { | |
211 | printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); | |
212 | if (mem_max == mem_limit) | |
213 | npmem_ranges = i; | |
214 | else { | |
215 | pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) | |
216 | - (mem_max >> PAGE_SHIFT); | |
217 | npmem_ranges = i + 1; | |
218 | mem_max = mem_limit; | |
219 | } | |
220 | num_physpages += pmem_ranges[i].pages; | |
221 | break; | |
222 | } | |
223 | num_physpages += pmem_ranges[i].pages; | |
224 | mem_max += rsize; | |
225 | } | |
226 | ||
227 | printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); | |
228 | ||
229 | #ifndef CONFIG_DISCONTIGMEM | |
230 | /* Merge the ranges, keeping track of the holes */ | |
231 | ||
232 | { | |
233 | unsigned long end_pfn; | |
234 | unsigned long hole_pages; | |
235 | ||
236 | npmem_holes = 0; | |
237 | end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; | |
238 | for (i = 1; i < npmem_ranges; i++) { | |
239 | ||
240 | hole_pages = pmem_ranges[i].start_pfn - end_pfn; | |
241 | if (hole_pages) { | |
242 | pmem_holes[npmem_holes].start_pfn = end_pfn; | |
243 | pmem_holes[npmem_holes++].pages = hole_pages; | |
244 | end_pfn += hole_pages; | |
245 | } | |
246 | end_pfn += pmem_ranges[i].pages; | |
247 | } | |
248 | ||
249 | pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; | |
250 | npmem_ranges = 1; | |
251 | } | |
252 | #endif | |
253 | ||
254 | bootmap_pages = 0; | |
255 | for (i = 0; i < npmem_ranges; i++) | |
256 | bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); | |
257 | ||
258 | bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; | |
259 | ||
260 | #ifdef CONFIG_DISCONTIGMEM | |
261 | for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { | |
262 | memset(NODE_DATA(i), 0, sizeof(pg_data_t)); | |
b61bfa3c | 263 | NODE_DATA(i)->bdata = &bootmem_node_data[i]; |
1da177e4 LT |
264 | } |
265 | memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); | |
266 | ||
d9b41e0b DR |
267 | for (i = 0; i < npmem_ranges; i++) { |
268 | node_set_state(i, N_NORMAL_MEMORY); | |
1da177e4 | 269 | node_set_online(i); |
d9b41e0b | 270 | } |
1da177e4 LT |
271 | #endif |
272 | ||
273 | /* | |
274 | * Initialize and free the full range of memory in each range. | |
275 | * Note that the only writing these routines do are to the bootmap, | |
276 | * and we've made sure to locate the bootmap properly so that they | |
277 | * won't be writing over anything important. | |
278 | */ | |
279 | ||
280 | bootmap_pfn = bootmap_start_pfn; | |
281 | max_pfn = 0; | |
282 | for (i = 0; i < npmem_ranges; i++) { | |
283 | unsigned long start_pfn; | |
284 | unsigned long npages; | |
285 | ||
286 | start_pfn = pmem_ranges[i].start_pfn; | |
287 | npages = pmem_ranges[i].pages; | |
288 | ||
289 | bootmap_size = init_bootmem_node(NODE_DATA(i), | |
290 | bootmap_pfn, | |
291 | start_pfn, | |
292 | (start_pfn + npages) ); | |
293 | free_bootmem_node(NODE_DATA(i), | |
294 | (start_pfn << PAGE_SHIFT), | |
295 | (npages << PAGE_SHIFT) ); | |
296 | bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
297 | if ((start_pfn + npages) > max_pfn) | |
298 | max_pfn = start_pfn + npages; | |
299 | } | |
300 | ||
5cdb8205 GG |
301 | /* IOMMU is always used to access "high mem" on those boxes |
302 | * that can support enough mem that a PCI device couldn't | |
303 | * directly DMA to any physical addresses. | |
304 | * ISA DMA support will need to revisit this. | |
305 | */ | |
306 | max_low_pfn = max_pfn; | |
307 | ||
8980a7ba HD |
308 | /* bootmap sizing messed up? */ |
309 | BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages); | |
1da177e4 LT |
310 | |
311 | /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ | |
312 | ||
313 | #define PDC_CONSOLE_IO_IODC_SIZE 32768 | |
314 | ||
315 | reserve_bootmem_node(NODE_DATA(0), 0UL, | |
72a7fe39 BW |
316 | (unsigned long)(PAGE0->mem_free + |
317 | PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT); | |
c51d476a | 318 | reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text), |
72a7fe39 | 319 | (unsigned long)(_end - _text), BOOTMEM_DEFAULT); |
1da177e4 | 320 | reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), |
72a7fe39 BW |
321 | ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT), |
322 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
323 | |
324 | #ifndef CONFIG_DISCONTIGMEM | |
325 | ||
326 | /* reserve the holes */ | |
327 | ||
328 | for (i = 0; i < npmem_holes; i++) { | |
329 | reserve_bootmem_node(NODE_DATA(0), | |
330 | (pmem_holes[i].start_pfn << PAGE_SHIFT), | |
72a7fe39 BW |
331 | (pmem_holes[i].pages << PAGE_SHIFT), |
332 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
333 | } |
334 | #endif | |
335 | ||
336 | #ifdef CONFIG_BLK_DEV_INITRD | |
337 | if (initrd_start) { | |
338 | printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); | |
339 | if (__pa(initrd_start) < mem_max) { | |
340 | unsigned long initrd_reserve; | |
341 | ||
342 | if (__pa(initrd_end) > mem_max) { | |
343 | initrd_reserve = mem_max - __pa(initrd_start); | |
344 | } else { | |
345 | initrd_reserve = initrd_end - initrd_start; | |
346 | } | |
347 | initrd_below_start_ok = 1; | |
348 | printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); | |
349 | ||
72a7fe39 BW |
350 | reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start), |
351 | initrd_reserve, BOOTMEM_DEFAULT); | |
1da177e4 LT |
352 | } |
353 | } | |
354 | #endif | |
355 | ||
356 | data_resource.start = virt_to_phys(&data_start); | |
c51d476a KM |
357 | data_resource.end = virt_to_phys(_end) - 1; |
358 | code_resource.start = virt_to_phys(_text); | |
1da177e4 LT |
359 | code_resource.end = virt_to_phys(&data_start)-1; |
360 | ||
361 | /* We don't know which region the kernel will be in, so try | |
362 | * all of them. | |
363 | */ | |
364 | for (i = 0; i < sysram_resource_count; i++) { | |
365 | struct resource *res = &sysram_resources[i]; | |
366 | request_resource(res, &code_resource); | |
367 | request_resource(res, &data_resource); | |
368 | } | |
369 | request_resource(&sysram_resources[0], &pdcdata_resource); | |
370 | } | |
371 | ||
d7dd2ff1 JB |
372 | static void __init map_pages(unsigned long start_vaddr, |
373 | unsigned long start_paddr, unsigned long size, | |
374 | pgprot_t pgprot, int force) | |
375 | { | |
376 | pgd_t *pg_dir; | |
377 | pmd_t *pmd; | |
378 | pte_t *pg_table; | |
379 | unsigned long end_paddr; | |
380 | unsigned long start_pmd; | |
381 | unsigned long start_pte; | |
382 | unsigned long tmp1; | |
383 | unsigned long tmp2; | |
384 | unsigned long address; | |
385 | unsigned long vaddr; | |
386 | unsigned long ro_start; | |
387 | unsigned long ro_end; | |
388 | unsigned long fv_addr; | |
389 | unsigned long gw_addr; | |
390 | extern const unsigned long fault_vector_20; | |
391 | extern void * const linux_gateway_page; | |
392 | ||
393 | ro_start = __pa((unsigned long)_text); | |
394 | ro_end = __pa((unsigned long)&data_start); | |
395 | fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; | |
396 | gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; | |
397 | ||
398 | end_paddr = start_paddr + size; | |
399 | ||
400 | pg_dir = pgd_offset_k(start_vaddr); | |
401 | ||
402 | #if PTRS_PER_PMD == 1 | |
403 | start_pmd = 0; | |
404 | #else | |
405 | start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
406 | #endif | |
407 | start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
408 | ||
409 | address = start_paddr; | |
410 | vaddr = start_vaddr; | |
411 | while (address < end_paddr) { | |
412 | #if PTRS_PER_PMD == 1 | |
413 | pmd = (pmd_t *)__pa(pg_dir); | |
414 | #else | |
415 | pmd = (pmd_t *)pgd_address(*pg_dir); | |
416 | ||
417 | /* | |
418 | * pmd is physical at this point | |
419 | */ | |
420 | ||
421 | if (!pmd) { | |
422 | pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER); | |
423 | pmd = (pmd_t *) __pa(pmd); | |
424 | } | |
425 | ||
426 | pgd_populate(NULL, pg_dir, __va(pmd)); | |
427 | #endif | |
428 | pg_dir++; | |
429 | ||
430 | /* now change pmd to kernel virtual addresses */ | |
431 | ||
432 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
433 | for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { | |
434 | ||
435 | /* | |
436 | * pg_table is physical at this point | |
437 | */ | |
438 | ||
439 | pg_table = (pte_t *)pmd_address(*pmd); | |
440 | if (!pg_table) { | |
441 | pg_table = (pte_t *) | |
442 | alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE); | |
443 | pg_table = (pte_t *) __pa(pg_table); | |
444 | } | |
445 | ||
446 | pmd_populate_kernel(NULL, pmd, __va(pg_table)); | |
447 | ||
448 | /* now change pg_table to kernel virtual addresses */ | |
449 | ||
450 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
451 | for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { | |
452 | pte_t pte; | |
453 | ||
454 | /* | |
455 | * Map the fault vector writable so we can | |
456 | * write the HPMC checksum. | |
457 | */ | |
458 | if (force) | |
459 | pte = __mk_pte(address, pgprot); | |
460 | else if (core_kernel_text(vaddr) && | |
461 | address != fv_addr) | |
462 | pte = __mk_pte(address, PAGE_KERNEL_EXEC); | |
463 | else | |
464 | #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) | |
465 | if (address >= ro_start && address < ro_end | |
466 | && address != fv_addr | |
467 | && address != gw_addr) | |
468 | pte = __mk_pte(address, PAGE_KERNEL_RO); | |
469 | else | |
470 | #endif | |
471 | pte = __mk_pte(address, pgprot); | |
472 | ||
473 | if (address >= end_paddr) { | |
474 | if (force) | |
475 | break; | |
476 | else | |
477 | pte_val(pte) = 0; | |
478 | } | |
479 | ||
480 | set_pte(pg_table, pte); | |
481 | ||
482 | address += PAGE_SIZE; | |
483 | vaddr += PAGE_SIZE; | |
484 | } | |
485 | start_pte = 0; | |
486 | ||
487 | if (address >= end_paddr) | |
488 | break; | |
489 | } | |
490 | start_pmd = 0; | |
491 | } | |
492 | } | |
493 | ||
1da177e4 LT |
494 | void free_initmem(void) |
495 | { | |
4fb11781 KM |
496 | unsigned long addr; |
497 | unsigned long init_begin = (unsigned long)__init_begin; | |
498 | unsigned long init_end = (unsigned long)__init_end; | |
1da177e4 | 499 | |
d7dd2ff1 JB |
500 | /* The init text pages are marked R-X. We have to |
501 | * flush the icache and mark them RW- | |
502 | * | |
503 | * This is tricky, because map_pages is in the init section. | |
504 | * Do a dummy remap of the data section first (the data | |
505 | * section is already PAGE_KERNEL) to pull in the TLB entries | |
506 | * for map_kernel */ | |
507 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
508 | PAGE_KERNEL_RWX, 1); | |
509 | /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute | |
510 | * map_pages */ | |
511 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
512 | PAGE_KERNEL, 1); | |
513 | ||
514 | /* force the kernel to see the new TLB entries */ | |
515 | __flush_tlb_range(0, init_begin, init_end); | |
1da177e4 LT |
516 | /* Attempt to catch anyone trying to execute code here |
517 | * by filling the page with BRK insns. | |
1da177e4 | 518 | */ |
20dbc9f7 | 519 | memset((void *)init_begin, 0x00, init_end - init_begin); |
d7dd2ff1 JB |
520 | /* finally dump all the instructions which were cached, since the |
521 | * pages are no-longer executable */ | |
4fb11781 | 522 | flush_icache_range(init_begin, init_end); |
1da177e4 | 523 | |
2fd83038 | 524 | for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) { |
1da177e4 | 525 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 526 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
527 | free_page(addr); |
528 | num_physpages++; | |
529 | totalram_pages++; | |
530 | } | |
531 | ||
532 | /* set up a new led state on systems shipped LED State panel */ | |
533 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); | |
534 | ||
4fb11781 KM |
535 | printk(KERN_INFO "Freeing unused kernel memory: %luk freed\n", |
536 | (init_end - init_begin) >> 10); | |
1da177e4 LT |
537 | } |
538 | ||
1bcdd854 HD |
539 | |
540 | #ifdef CONFIG_DEBUG_RODATA | |
541 | void mark_rodata_ro(void) | |
542 | { | |
1bcdd854 HD |
543 | /* rodata memory was already mapped with KERNEL_RO access rights by |
544 | pagetable_init() and map_pages(). No need to do additional stuff here */ | |
545 | printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", | |
a581c2a4 | 546 | (unsigned long)(__end_rodata - __start_rodata) >> 10); |
1bcdd854 HD |
547 | } |
548 | #endif | |
549 | ||
550 | ||
1da177e4 LT |
551 | /* |
552 | * Just an arbitrary offset to serve as a "hole" between mapping areas | |
553 | * (between top of physical memory and a potential pcxl dma mapping | |
554 | * area, and below the vmalloc mapping area). | |
555 | * | |
556 | * The current 32K value just means that there will be a 32K "hole" | |
557 | * between mapping areas. That means that any out-of-bounds memory | |
558 | * accesses will hopefully be caught. The vmalloc() routines leaves | |
559 | * a hole of 4kB between each vmalloced area for the same reason. | |
560 | */ | |
561 | ||
562 | /* Leave room for gateway page expansion */ | |
563 | #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE | |
564 | #error KERNEL_MAP_START is in gateway reserved region | |
565 | #endif | |
566 | #define MAP_START (KERNEL_MAP_START) | |
567 | ||
568 | #define VM_MAP_OFFSET (32*1024) | |
569 | #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ | |
570 | & ~(VM_MAP_OFFSET-1))) | |
571 | ||
4255f0d2 HD |
572 | void *parisc_vmalloc_start __read_mostly; |
573 | EXPORT_SYMBOL(parisc_vmalloc_start); | |
1da177e4 LT |
574 | |
575 | #ifdef CONFIG_PA11 | |
8039de10 | 576 | unsigned long pcxl_dma_start __read_mostly; |
1da177e4 LT |
577 | #endif |
578 | ||
579 | void __init mem_init(void) | |
580 | { | |
ce8420bb | 581 | int codesize, reservedpages, datasize, initsize; |
ce8420bb | 582 | |
48d27cb2 HD |
583 | /* Do sanity checks on page table constants */ |
584 | BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); | |
585 | BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); | |
586 | BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); | |
587 | BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD | |
588 | > BITS_PER_LONG); | |
589 | ||
1da177e4 LT |
590 | high_memory = __va((max_pfn << PAGE_SHIFT)); |
591 | ||
592 | #ifndef CONFIG_DISCONTIGMEM | |
593 | max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; | |
594 | totalram_pages += free_all_bootmem(); | |
595 | #else | |
596 | { | |
597 | int i; | |
598 | ||
599 | for (i = 0; i < npmem_ranges; i++) | |
600 | totalram_pages += free_all_bootmem_node(NODE_DATA(i)); | |
601 | } | |
602 | #endif | |
603 | ||
53faf291 KM |
604 | codesize = (unsigned long)_etext - (unsigned long)_text; |
605 | datasize = (unsigned long)_edata - (unsigned long)_etext; | |
606 | initsize = (unsigned long)__init_end - (unsigned long)__init_begin; | |
ce8420bb HD |
607 | |
608 | reservedpages = 0; | |
53faf291 KM |
609 | { |
610 | unsigned long pfn; | |
611 | #ifdef CONFIG_DISCONTIGMEM | |
612 | int i; | |
613 | ||
614 | for (i = 0; i < npmem_ranges; i++) { | |
615 | for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) { | |
616 | if (PageReserved(pfn_to_page(pfn))) | |
617 | reservedpages++; | |
618 | } | |
619 | } | |
620 | #else /* !CONFIG_DISCONTIGMEM */ | |
621 | for (pfn = 0; pfn < max_pfn; pfn++) { | |
ce8420bb HD |
622 | /* |
623 | * Only count reserved RAM pages | |
624 | */ | |
53faf291 | 625 | if (PageReserved(pfn_to_page(pfn))) |
ce8420bb | 626 | reservedpages++; |
53faf291 KM |
627 | } |
628 | #endif | |
629 | } | |
1da177e4 LT |
630 | |
631 | #ifdef CONFIG_PA11 | |
632 | if (hppa_dma_ops == &pcxl_dma_ops) { | |
633 | pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); | |
4255f0d2 HD |
634 | parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start |
635 | + PCXL_DMA_MAP_SIZE); | |
1da177e4 LT |
636 | } else { |
637 | pcxl_dma_start = 0; | |
4255f0d2 | 638 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
639 | } |
640 | #else | |
4255f0d2 | 641 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
642 | #endif |
643 | ||
53faf291 | 644 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", |
cc013a88 | 645 | nr_free_pages() << (PAGE_SHIFT-10), |
ce8420bb HD |
646 | num_physpages << (PAGE_SHIFT-10), |
647 | codesize >> 10, | |
648 | reservedpages << (PAGE_SHIFT-10), | |
649 | datasize >> 10, | |
53faf291 KM |
650 | initsize >> 10 |
651 | ); | |
ce8420bb HD |
652 | |
653 | #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */ | |
654 | printk("virtual kernel memory layout:\n" | |
655 | " vmalloc : 0x%p - 0x%p (%4ld MB)\n" | |
53faf291 | 656 | " memory : 0x%p - 0x%p (%4ld MB)\n" |
ce8420bb HD |
657 | " .init : 0x%p - 0x%p (%4ld kB)\n" |
658 | " .data : 0x%p - 0x%p (%4ld kB)\n" | |
659 | " .text : 0x%p - 0x%p (%4ld kB)\n", | |
660 | ||
661 | (void*)VMALLOC_START, (void*)VMALLOC_END, | |
662 | (VMALLOC_END - VMALLOC_START) >> 20, | |
663 | ||
664 | __va(0), high_memory, | |
665 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
666 | ||
53faf291 KM |
667 | __init_begin, __init_end, |
668 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, | |
ce8420bb | 669 | |
53faf291 KM |
670 | _etext, _edata, |
671 | ((unsigned long)_edata - (unsigned long)_etext) >> 10, | |
ce8420bb | 672 | |
53faf291 KM |
673 | _text, _etext, |
674 | ((unsigned long)_etext - (unsigned long)_text) >> 10); | |
ce8420bb | 675 | #endif |
1da177e4 LT |
676 | } |
677 | ||
8039de10 | 678 | unsigned long *empty_zero_page __read_mostly; |
22febf1f | 679 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 680 | |
b2b755b5 | 681 | void show_mem(unsigned int filter) |
1da177e4 LT |
682 | { |
683 | int i,free = 0,total = 0,reserved = 0; | |
684 | int shared = 0, cached = 0; | |
685 | ||
686 | printk(KERN_INFO "Mem-info:\n"); | |
7bf02ea2 | 687 | show_free_areas(filter); |
1da177e4 LT |
688 | #ifndef CONFIG_DISCONTIGMEM |
689 | i = max_mapnr; | |
690 | while (i-- > 0) { | |
691 | total++; | |
692 | if (PageReserved(mem_map+i)) | |
693 | reserved++; | |
694 | else if (PageSwapCache(mem_map+i)) | |
695 | cached++; | |
696 | else if (!page_count(&mem_map[i])) | |
697 | free++; | |
698 | else | |
699 | shared += page_count(&mem_map[i]) - 1; | |
700 | } | |
701 | #else | |
702 | for (i = 0; i < npmem_ranges; i++) { | |
703 | int j; | |
704 | ||
705 | for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { | |
706 | struct page *p; | |
208d54e5 | 707 | unsigned long flags; |
1da177e4 | 708 | |
208d54e5 | 709 | pgdat_resize_lock(NODE_DATA(i), &flags); |
408fde81 | 710 | p = nid_page_nr(i, j) - node_start_pfn(i); |
1da177e4 LT |
711 | |
712 | total++; | |
713 | if (PageReserved(p)) | |
714 | reserved++; | |
715 | else if (PageSwapCache(p)) | |
716 | cached++; | |
717 | else if (!page_count(p)) | |
718 | free++; | |
719 | else | |
720 | shared += page_count(p) - 1; | |
208d54e5 | 721 | pgdat_resize_unlock(NODE_DATA(i), &flags); |
1da177e4 LT |
722 | } |
723 | } | |
724 | #endif | |
725 | printk(KERN_INFO "%d pages of RAM\n", total); | |
726 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
727 | printk(KERN_INFO "%d pages shared\n", shared); | |
728 | printk(KERN_INFO "%d pages swap cached\n", cached); | |
729 | ||
730 | ||
731 | #ifdef CONFIG_DISCONTIGMEM | |
732 | { | |
733 | struct zonelist *zl; | |
54a6eb5c | 734 | int i, j; |
1da177e4 LT |
735 | |
736 | for (i = 0; i < npmem_ranges; i++) { | |
4413a0f6 | 737 | zl = node_zonelist(i, 0); |
1da177e4 | 738 | for (j = 0; j < MAX_NR_ZONES; j++) { |
dd1a239f | 739 | struct zoneref *z; |
54a6eb5c | 740 | struct zone *zone; |
1da177e4 LT |
741 | |
742 | printk("Zone list for zone %d on node %d: ", j, i); | |
54a6eb5c MG |
743 | for_each_zone_zonelist(zone, z, zl, j) |
744 | printk("[%d/%s] ", zone_to_nid(zone), | |
745 | zone->name); | |
1da177e4 LT |
746 | printk("\n"); |
747 | } | |
748 | } | |
749 | } | |
750 | #endif | |
751 | } | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * pagetable_init() sets up the page tables | |
755 | * | |
756 | * Note that gateway_init() places the Linux gateway page at page 0. | |
757 | * Since gateway pages cannot be dereferenced this has the desirable | |
758 | * side effect of trapping those pesky NULL-reference errors in the | |
759 | * kernel. | |
760 | */ | |
761 | static void __init pagetable_init(void) | |
762 | { | |
763 | int range; | |
764 | ||
765 | /* Map each physical memory range to its kernel vaddr */ | |
766 | ||
767 | for (range = 0; range < npmem_ranges; range++) { | |
768 | unsigned long start_paddr; | |
769 | unsigned long end_paddr; | |
770 | unsigned long size; | |
771 | ||
772 | start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; | |
773 | end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); | |
774 | size = pmem_ranges[range].pages << PAGE_SHIFT; | |
775 | ||
776 | map_pages((unsigned long)__va(start_paddr), start_paddr, | |
d7dd2ff1 | 777 | size, PAGE_KERNEL, 0); |
1da177e4 LT |
778 | } |
779 | ||
780 | #ifdef CONFIG_BLK_DEV_INITRD | |
781 | if (initrd_end && initrd_end > mem_limit) { | |
1bcdd854 | 782 | printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
1da177e4 | 783 | map_pages(initrd_start, __pa(initrd_start), |
d7dd2ff1 | 784 | initrd_end - initrd_start, PAGE_KERNEL, 0); |
1da177e4 LT |
785 | } |
786 | #endif | |
787 | ||
788 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
789 | memset(empty_zero_page, 0, PAGE_SIZE); | |
790 | } | |
791 | ||
792 | static void __init gateway_init(void) | |
793 | { | |
794 | unsigned long linux_gateway_page_addr; | |
795 | /* FIXME: This is 'const' in order to trick the compiler | |
796 | into not treating it as DP-relative data. */ | |
797 | extern void * const linux_gateway_page; | |
798 | ||
799 | linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; | |
800 | ||
801 | /* | |
802 | * Setup Linux Gateway page. | |
803 | * | |
804 | * The Linux gateway page will reside in kernel space (on virtual | |
805 | * page 0), so it doesn't need to be aliased into user space. | |
806 | */ | |
807 | ||
808 | map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), | |
d7dd2ff1 | 809 | PAGE_SIZE, PAGE_GATEWAY, 1); |
1da177e4 LT |
810 | } |
811 | ||
812 | #ifdef CONFIG_HPUX | |
813 | void | |
814 | map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) | |
815 | { | |
816 | pgd_t *pg_dir; | |
817 | pmd_t *pmd; | |
818 | pte_t *pg_table; | |
819 | unsigned long start_pmd; | |
820 | unsigned long start_pte; | |
821 | unsigned long address; | |
822 | unsigned long hpux_gw_page_addr; | |
823 | /* FIXME: This is 'const' in order to trick the compiler | |
824 | into not treating it as DP-relative data. */ | |
825 | extern void * const hpux_gateway_page; | |
826 | ||
827 | hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; | |
828 | ||
829 | /* | |
830 | * Setup HP-UX Gateway page. | |
831 | * | |
832 | * The HP-UX gateway page resides in the user address space, | |
833 | * so it needs to be aliased into each process. | |
834 | */ | |
835 | ||
836 | pg_dir = pgd_offset(mm,hpux_gw_page_addr); | |
837 | ||
838 | #if PTRS_PER_PMD == 1 | |
839 | start_pmd = 0; | |
840 | #else | |
841 | start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
842 | #endif | |
843 | start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
844 | ||
845 | address = __pa(&hpux_gateway_page); | |
846 | #if PTRS_PER_PMD == 1 | |
847 | pmd = (pmd_t *)__pa(pg_dir); | |
848 | #else | |
849 | pmd = (pmd_t *) pgd_address(*pg_dir); | |
850 | ||
851 | /* | |
852 | * pmd is physical at this point | |
853 | */ | |
854 | ||
855 | if (!pmd) { | |
856 | pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); | |
857 | pmd = (pmd_t *) __pa(pmd); | |
858 | } | |
859 | ||
860 | __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); | |
861 | #endif | |
862 | /* now change pmd to kernel virtual addresses */ | |
863 | ||
864 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
865 | ||
866 | /* | |
867 | * pg_table is physical at this point | |
868 | */ | |
869 | ||
870 | pg_table = (pte_t *) pmd_address(*pmd); | |
871 | if (!pg_table) | |
872 | pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); | |
873 | ||
874 | __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); | |
875 | ||
876 | /* now change pg_table to kernel virtual addresses */ | |
877 | ||
878 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
879 | set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); | |
880 | } | |
881 | EXPORT_SYMBOL(map_hpux_gateway_page); | |
882 | #endif | |
883 | ||
1da177e4 LT |
884 | void __init paging_init(void) |
885 | { | |
886 | int i; | |
887 | ||
888 | setup_bootmem(); | |
889 | pagetable_init(); | |
890 | gateway_init(); | |
891 | flush_cache_all_local(); /* start with known state */ | |
ce33941f | 892 | flush_tlb_all_local(NULL); |
1da177e4 LT |
893 | |
894 | for (i = 0; i < npmem_ranges; i++) { | |
f06a9684 | 895 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
1da177e4 | 896 | |
00592837 | 897 | zones_size[ZONE_NORMAL] = pmem_ranges[i].pages; |
1da177e4 LT |
898 | |
899 | #ifdef CONFIG_DISCONTIGMEM | |
900 | /* Need to initialize the pfnnid_map before we can initialize | |
901 | the zone */ | |
902 | { | |
903 | int j; | |
904 | for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); | |
905 | j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); | |
906 | j++) { | |
907 | pfnnid_map[j] = i; | |
908 | } | |
909 | } | |
910 | #endif | |
911 | ||
9109fb7b | 912 | free_area_init_node(i, zones_size, |
1da177e4 LT |
913 | pmem_ranges[i].start_pfn, NULL); |
914 | } | |
915 | } | |
916 | ||
917 | #ifdef CONFIG_PA20 | |
918 | ||
919 | /* | |
7022672e | 920 | * Currently, all PA20 chips have 18 bit protection IDs, which is the |
1da177e4 LT |
921 | * limiting factor (space ids are 32 bits). |
922 | */ | |
923 | ||
924 | #define NR_SPACE_IDS 262144 | |
925 | ||
926 | #else | |
927 | ||
928 | /* | |
7022672e SA |
929 | * Currently we have a one-to-one relationship between space IDs and |
930 | * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only | |
931 | * support 15 bit protection IDs, so that is the limiting factor. | |
932 | * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's | |
1da177e4 LT |
933 | * probably not worth the effort for a special case here. |
934 | */ | |
935 | ||
936 | #define NR_SPACE_IDS 32768 | |
937 | ||
938 | #endif /* !CONFIG_PA20 */ | |
939 | ||
940 | #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) | |
941 | #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) | |
942 | ||
943 | static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ | |
944 | static unsigned long dirty_space_id[SID_ARRAY_SIZE]; | |
945 | static unsigned long space_id_index; | |
946 | static unsigned long free_space_ids = NR_SPACE_IDS - 1; | |
947 | static unsigned long dirty_space_ids = 0; | |
948 | ||
949 | static DEFINE_SPINLOCK(sid_lock); | |
950 | ||
951 | unsigned long alloc_sid(void) | |
952 | { | |
953 | unsigned long index; | |
954 | ||
955 | spin_lock(&sid_lock); | |
956 | ||
957 | if (free_space_ids == 0) { | |
958 | if (dirty_space_ids != 0) { | |
959 | spin_unlock(&sid_lock); | |
960 | flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ | |
961 | spin_lock(&sid_lock); | |
962 | } | |
2fd83038 | 963 | BUG_ON(free_space_ids == 0); |
1da177e4 LT |
964 | } |
965 | ||
966 | free_space_ids--; | |
967 | ||
968 | index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); | |
969 | space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); | |
970 | space_id_index = index; | |
971 | ||
972 | spin_unlock(&sid_lock); | |
973 | ||
974 | return index << SPACEID_SHIFT; | |
975 | } | |
976 | ||
977 | void free_sid(unsigned long spaceid) | |
978 | { | |
979 | unsigned long index = spaceid >> SPACEID_SHIFT; | |
980 | unsigned long *dirty_space_offset; | |
981 | ||
982 | dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); | |
983 | index &= (BITS_PER_LONG - 1); | |
984 | ||
985 | spin_lock(&sid_lock); | |
986 | ||
2fd83038 | 987 | BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ |
1da177e4 LT |
988 | |
989 | *dirty_space_offset |= (1L << index); | |
990 | dirty_space_ids++; | |
991 | ||
992 | spin_unlock(&sid_lock); | |
993 | } | |
994 | ||
995 | ||
996 | #ifdef CONFIG_SMP | |
997 | static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) | |
998 | { | |
999 | int i; | |
1000 | ||
1001 | /* NOTE: sid_lock must be held upon entry */ | |
1002 | ||
1003 | *ndirtyptr = dirty_space_ids; | |
1004 | if (dirty_space_ids != 0) { | |
1005 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1006 | dirty_array[i] = dirty_space_id[i]; | |
1007 | dirty_space_id[i] = 0; | |
1008 | } | |
1009 | dirty_space_ids = 0; | |
1010 | } | |
1011 | ||
1012 | return; | |
1013 | } | |
1014 | ||
1015 | static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) | |
1016 | { | |
1017 | int i; | |
1018 | ||
1019 | /* NOTE: sid_lock must be held upon entry */ | |
1020 | ||
1021 | if (ndirty != 0) { | |
1022 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1023 | space_id[i] ^= dirty_array[i]; | |
1024 | } | |
1025 | ||
1026 | free_space_ids += ndirty; | |
1027 | space_id_index = 0; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | #else /* CONFIG_SMP */ | |
1032 | ||
1033 | static void recycle_sids(void) | |
1034 | { | |
1035 | int i; | |
1036 | ||
1037 | /* NOTE: sid_lock must be held upon entry */ | |
1038 | ||
1039 | if (dirty_space_ids != 0) { | |
1040 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1041 | space_id[i] ^= dirty_space_id[i]; | |
1042 | dirty_space_id[i] = 0; | |
1043 | } | |
1044 | ||
1045 | free_space_ids += dirty_space_ids; | |
1046 | dirty_space_ids = 0; | |
1047 | space_id_index = 0; | |
1048 | } | |
1049 | } | |
1050 | #endif | |
1051 | ||
1052 | /* | |
1053 | * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is | |
1054 | * purged, we can safely reuse the space ids that were released but | |
1055 | * not flushed from the tlb. | |
1056 | */ | |
1057 | ||
1058 | #ifdef CONFIG_SMP | |
1059 | ||
1060 | static unsigned long recycle_ndirty; | |
1061 | static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; | |
2fd83038 | 1062 | static unsigned int recycle_inuse; |
1da177e4 LT |
1063 | |
1064 | void flush_tlb_all(void) | |
1065 | { | |
1066 | int do_recycle; | |
1067 | ||
1068 | do_recycle = 0; | |
1069 | spin_lock(&sid_lock); | |
1070 | if (dirty_space_ids > RECYCLE_THRESHOLD) { | |
2fd83038 | 1071 | BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
1da177e4 LT |
1072 | get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
1073 | recycle_inuse++; | |
1074 | do_recycle++; | |
1075 | } | |
1076 | spin_unlock(&sid_lock); | |
15c8b6c1 | 1077 | on_each_cpu(flush_tlb_all_local, NULL, 1); |
1da177e4 LT |
1078 | if (do_recycle) { |
1079 | spin_lock(&sid_lock); | |
1080 | recycle_sids(recycle_ndirty,recycle_dirty_array); | |
1081 | recycle_inuse = 0; | |
1082 | spin_unlock(&sid_lock); | |
1083 | } | |
1084 | } | |
1085 | #else | |
1086 | void flush_tlb_all(void) | |
1087 | { | |
1088 | spin_lock(&sid_lock); | |
1b2425e3 | 1089 | flush_tlb_all_local(NULL); |
1da177e4 LT |
1090 | recycle_sids(); |
1091 | spin_unlock(&sid_lock); | |
1092 | } | |
1093 | #endif | |
1094 | ||
1095 | #ifdef CONFIG_BLK_DEV_INITRD | |
1096 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1097 | { | |
94c3e87a HD |
1098 | if (start >= end) |
1099 | return; | |
1100 | printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
1da177e4 LT |
1101 | for (; start < end; start += PAGE_SIZE) { |
1102 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 1103 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
1104 | free_page(start); |
1105 | num_physpages++; | |
1106 | totalram_pages++; | |
1107 | } | |
1da177e4 LT |
1108 | } |
1109 | #endif |