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Paul Mackerras14cf11a2005-09-26 16:04:21 +10001/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
Paul Mackerras14cf11a2005-09-26 16:04:21 +10008 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 */
19
Paul Mackerras14cf11a2005-09-26 16:04:21 +100020#include <linux/module.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/types.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/init.h>
29#include <linux/bootmem.h>
30#include <linux/highmem.h>
31#include <linux/initrd.h>
32#include <linux/pagemap.h>
Johannes Berg4e8ad3e2007-05-08 19:25:00 +100033#include <linux/suspend.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100034
35#include <asm/pgalloc.h>
36#include <asm/prom.h>
37#include <asm/io.h>
38#include <asm/mmu_context.h>
39#include <asm/pgtable.h>
40#include <asm/mmu.h>
41#include <asm/smp.h>
42#include <asm/machdep.h>
43#include <asm/btext.h>
44#include <asm/tlb.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100045#include <asm/prom.h>
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100046#include <asm/lmb.h>
47#include <asm/sections.h>
Paul Mackerrasab1f9da2005-10-10 21:58:35 +100048#include <asm/vdso.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100049
Paul Mackerras14cf11a2005-09-26 16:04:21 +100050#include "mmu_decl.h"
51
52#ifndef CPU_FTR_COHERENT_ICACHE
53#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
54#define CPU_FTR_NOEXECUTE 0
55#endif
56
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100057int init_bootmem_done;
58int mem_init_done;
Paul Mackerrascf00a8d2005-10-31 13:07:02 +110059unsigned long memory_limit;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100060
Paul Mackerras14cf11a2005-09-26 16:04:21 +100061int page_is_ram(unsigned long pfn)
62{
63 unsigned long paddr = (pfn << PAGE_SHIFT);
64
65#ifndef CONFIG_PPC64 /* XXX for now */
66 return paddr < __pa(high_memory);
67#else
68 int i;
69 for (i=0; i < lmb.memory.cnt; i++) {
70 unsigned long base;
71
72 base = lmb.memory.region[i].base;
73
74 if ((paddr >= base) &&
75 (paddr < (base + lmb.memory.region[i].size))) {
76 return 1;
77 }
78 }
79
80 return 0;
81#endif
82}
Paul Mackerras14cf11a2005-09-26 16:04:21 +100083
Roland Dreier8b150472005-10-28 17:46:18 -070084pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
Paul Mackerras14cf11a2005-09-26 16:04:21 +100085 unsigned long size, pgprot_t vma_prot)
86{
87 if (ppc_md.phys_mem_access_prot)
Roland Dreier8b150472005-10-28 17:46:18 -070088 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100089
Roland Dreier8b150472005-10-28 17:46:18 -070090 if (!page_is_ram(pfn))
Paul Mackerras14cf11a2005-09-26 16:04:21 +100091 vma_prot = __pgprot(pgprot_val(vma_prot)
92 | _PAGE_GUARDED | _PAGE_NO_CACHE);
93 return vma_prot;
94}
95EXPORT_SYMBOL(phys_mem_access_prot);
96
Paul Mackerras23fd0772005-10-31 13:37:12 +110097#ifdef CONFIG_MEMORY_HOTPLUG
98
99void online_page(struct page *page)
100{
101 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800102 init_page_count(page);
Nick Piggin70dc9912006-03-22 00:08:35 -0800103 __free_page(page);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100104 totalram_pages++;
105 num_physpages++;
106}
107
Yasunori Gotobc02af92006-06-27 02:53:30 -0700108#ifdef CONFIG_NUMA
109int memory_add_physaddr_to_nid(u64 start)
110{
111 return hot_add_scn_to_nid(start);
112}
113#endif
114
115int __devinit arch_add_memory(int nid, u64 start, u64 size)
Paul Mackerras23fd0772005-10-31 13:37:12 +1100116{
Mike Kravetz237a09892005-12-05 12:06:42 -0800117 struct pglist_data *pgdata;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100118 struct zone *zone;
119 unsigned long start_pfn = start >> PAGE_SHIFT;
120 unsigned long nr_pages = size >> PAGE_SHIFT;
121
Mike Kravetz237a09892005-12-05 12:06:42 -0800122 pgdata = NODE_DATA(nid);
123
Andrew Morton2d0eee12006-03-21 23:00:05 -0800124 start = (unsigned long)__va(start);
Mike Kravetz54b79242005-11-07 16:25:48 -0800125 create_section_mapping(start, start + size);
126
Paul Mackerras23fd0772005-10-31 13:37:12 +1100127 /* this should work for most non-highmem platforms */
128 zone = pgdata->node_zones;
129
130 return __add_pages(zone, start_pfn, nr_pages);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100131}
132
133/*
134 * First pass at this code will check to determine if the remove
135 * request is within the RMO. Do not allow removal within the RMO.
136 */
137int __devinit remove_memory(u64 start, u64 size)
138{
139 struct zone *zone;
140 unsigned long start_pfn, end_pfn, nr_pages;
141
142 start_pfn = start >> PAGE_SHIFT;
143 nr_pages = size >> PAGE_SHIFT;
144 end_pfn = start_pfn + nr_pages;
145
146 printk("%s(): Attempting to remove memoy in range "
147 "%lx to %lx\n", __func__, start, start+size);
148 /*
149 * check for range within RMO
150 */
151 zone = page_zone(pfn_to_page(start_pfn));
152
153 printk("%s(): memory will be removed from "
154 "the %s zone\n", __func__, zone->name);
155
156 /*
157 * not handling removing memory ranges that
158 * overlap multiple zones yet
159 */
160 if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
161 goto overlap;
162
163 /* make sure it is NOT in RMO */
164 if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
165 printk("%s(): range to be removed must NOT be in RMO!\n",
166 __func__);
167 goto in_rmo;
168 }
169
170 return __remove_pages(zone, start_pfn, nr_pages);
171
172overlap:
173 printk("%s(): memory range to be removed overlaps "
174 "multiple zones!!!\n", __func__);
175in_rmo:
176 return -1;
177}
178#endif /* CONFIG_MEMORY_HOTPLUG */
179
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000180void show_mem(void)
181{
182 unsigned long total = 0, reserved = 0;
183 unsigned long shared = 0, cached = 0;
184 unsigned long highmem = 0;
185 struct page *page;
186 pg_data_t *pgdat;
187 unsigned long i;
188
189 printk("Mem-info:\n");
190 show_free_areas();
191 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
KAMEZAWA Hiroyukiec936fc2006-03-27 01:15:59 -0800192 for_each_online_pgdat(pgdat) {
Paul Mackerras23fd0772005-10-31 13:37:12 +1100193 unsigned long flags;
194 pgdat_resize_lock(pgdat, &flags);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000195 for (i = 0; i < pgdat->node_spanned_pages; i++) {
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100196 if (!pfn_valid(pgdat->node_start_pfn + i))
197 continue;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000198 page = pgdat_page_nr(pgdat, i);
199 total++;
200 if (PageHighMem(page))
201 highmem++;
202 if (PageReserved(page))
203 reserved++;
204 else if (PageSwapCache(page))
205 cached++;
206 else if (page_count(page))
207 shared += page_count(page) - 1;
208 }
Paul Mackerras23fd0772005-10-31 13:37:12 +1100209 pgdat_resize_unlock(pgdat, &flags);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000210 }
211 printk("%ld pages of RAM\n", total);
212#ifdef CONFIG_HIGHMEM
213 printk("%ld pages of HIGHMEM\n", highmem);
214#endif
215 printk("%ld reserved pages\n", reserved);
216 printk("%ld pages shared\n", shared);
217 printk("%ld pages swap cached\n", cached);
218}
219
220/*
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000221 * Initialize the bootmem system and give it all the memory we
222 * have available. If we are using highmem, we only put the
223 * lowmem into the bootmem system.
224 */
225#ifndef CONFIG_NEED_MULTIPLE_NODES
226void __init do_init_bootmem(void)
227{
228 unsigned long i;
229 unsigned long start, bootmap_pages;
230 unsigned long total_pages;
231 int boot_mapsize;
232
233 max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
234#ifdef CONFIG_HIGHMEM
235 total_pages = total_lowmem >> PAGE_SHIFT;
236#endif
237
238 /*
239 * Find an area to use for the bootmem bitmap. Calculate the size of
240 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
241 * Add 1 additional page in case the address isn't page-aligned.
242 */
243 bootmap_pages = bootmem_bootmap_pages(total_pages);
244
245 start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000246
247 boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
248
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700249 /* Add active regions with valid PFNs */
250 for (i = 0; i < lmb.memory.cnt; i++) {
251 unsigned long start_pfn, end_pfn;
252 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
253 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
254 add_active_range(0, start_pfn, end_pfn);
255 }
256
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000257 /* Add all physical memory to the bootmem map, mark each area
258 * present.
259 */
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000260#ifdef CONFIG_HIGHMEM
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700261 free_bootmem_with_active_regions(0, total_lowmem >> PAGE_SHIFT);
262#else
263 free_bootmem_with_active_regions(0, max_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000264#endif
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000265
266 /* reserve the sections we're already using */
267 for (i = 0; i < lmb.reserved.cnt; i++)
268 reserve_bootmem(lmb.reserved.region[i].base,
269 lmb_size_bytes(&lmb.reserved, i));
270
271 /* XXX need to clip this if using highmem? */
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700272 sparse_memory_present_with_active_regions(0);
273
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000274 init_bootmem_done = 1;
275}
276
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000277/* mark pages that don't exist as nosave */
278static int __init mark_nonram_nosave(void)
279{
280 unsigned long lmb_next_region_start_pfn,
281 lmb_region_max_pfn;
282 int i;
283
284 for (i = 0; i < lmb.memory.cnt - 1; i++) {
285 lmb_region_max_pfn =
286 (lmb.memory.region[i].base >> PAGE_SHIFT) +
287 (lmb.memory.region[i].size >> PAGE_SHIFT);
288 lmb_next_region_start_pfn =
289 lmb.memory.region[i+1].base >> PAGE_SHIFT;
290
291 if (lmb_region_max_pfn < lmb_next_region_start_pfn)
292 register_nosave_region(lmb_region_max_pfn,
293 lmb_next_region_start_pfn);
294 }
295
296 return 0;
297}
298
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000299/*
300 * paging_init() sets up the page tables - in fact we've already done this.
301 */
302void __init paging_init(void)
303{
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000304 unsigned long total_ram = lmb_phys_mem_size();
305 unsigned long top_of_ram = lmb_end_of_DRAM();
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700306 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000307
308#ifdef CONFIG_HIGHMEM
309 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
Benjamin Herrenschmidt5453e772007-05-22 16:25:51 +1000310 pkmap_page_table = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k
311 (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000312 map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */
Benjamin Herrenschmidt5453e772007-05-22 16:25:51 +1000313 kmap_pte = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k
314 (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN),
315 KMAP_FIX_BEGIN);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000316 kmap_prot = PAGE_KERNEL;
317#endif /* CONFIG_HIGHMEM */
318
Olof Johanssone110b282006-04-12 15:25:01 -0500319 printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000320 top_of_ram, total_ram);
Olof Johanssone110b282006-04-12 15:25:01 -0500321 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000322 (top_of_ram - total_ram) >> 20);
Mel Gorman6391af12006-10-11 01:20:39 -0700323 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000324#ifdef CONFIG_HIGHMEM
Mel Gorman6391af12006-10-11 01:20:39 -0700325 max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
326 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000327#else
Mel Gorman6391af12006-10-11 01:20:39 -0700328 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700329#endif
330 free_area_init_nodes(max_zone_pfns);
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000331
332 mark_nonram_nosave();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000333}
334#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
335
336void __init mem_init(void)
337{
338#ifdef CONFIG_NEED_MULTIPLE_NODES
339 int nid;
340#endif
341 pg_data_t *pgdat;
342 unsigned long i;
343 struct page *page;
344 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
345
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100346 num_physpages = lmb.memory.size >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000347 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
348
349#ifdef CONFIG_NEED_MULTIPLE_NODES
350 for_each_online_node(nid) {
351 if (NODE_DATA(nid)->node_spanned_pages != 0) {
Anton Blanchardc258dd42006-03-25 17:27:09 +1100352 printk("freeing bootmem node %d\n", nid);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000353 totalram_pages +=
354 free_all_bootmem_node(NODE_DATA(nid));
355 }
356 }
357#else
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100358 max_mapnr = max_pfn;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000359 totalram_pages += free_all_bootmem();
360#endif
KAMEZAWA Hiroyukiec936fc2006-03-27 01:15:59 -0800361 for_each_online_pgdat(pgdat) {
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000362 for (i = 0; i < pgdat->node_spanned_pages; i++) {
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100363 if (!pfn_valid(pgdat->node_start_pfn + i))
364 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000365 page = pgdat_page_nr(pgdat, i);
366 if (PageReserved(page))
367 reservedpages++;
368 }
369 }
370
371 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
Anton Blanchardbcb35572005-11-07 17:43:07 +1100372 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000373 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
374 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
375
376#ifdef CONFIG_HIGHMEM
377 {
378 unsigned long pfn, highmem_mapnr;
379
380 highmem_mapnr = total_lowmem >> PAGE_SHIFT;
381 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
382 struct page *page = pfn_to_page(pfn);
383
384 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800385 init_page_count(page);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000386 __free_page(page);
387 totalhigh_pages++;
388 }
389 totalram_pages += totalhigh_pages;
Olof Johanssone110b282006-04-12 15:25:01 -0500390 printk(KERN_DEBUG "High memory: %luk\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000391 totalhigh_pages << (PAGE_SHIFT-10));
392 }
393#endif /* CONFIG_HIGHMEM */
394
395 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
396 "%luk reserved, %luk data, %luk bss, %luk init)\n",
397 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
398 num_physpages << (PAGE_SHIFT-10),
399 codesize >> 10,
400 reservedpages << (PAGE_SHIFT-10),
401 datasize >> 10,
402 bsssize >> 10,
403 initsize >> 10);
404
405 mem_init_done = 1;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000406}
407
408/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000409 * This is called when a page has been modified by the kernel.
410 * It just marks the page as not i-cache clean. We do the i-cache
411 * flush later when the page is given to a user process, if necessary.
412 */
413void flush_dcache_page(struct page *page)
414{
415 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
416 return;
417 /* avoid an atomic op if possible */
418 if (test_bit(PG_arch_1, &page->flags))
419 clear_bit(PG_arch_1, &page->flags);
420}
421EXPORT_SYMBOL(flush_dcache_page);
422
423void flush_dcache_icache_page(struct page *page)
424{
425#ifdef CONFIG_BOOKE
426 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
427 __flush_dcache_icache(start);
428 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
Paul Mackerrasab1f9da2005-10-10 21:58:35 +1000429#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000430 /* On 8xx there is no need to kmap since highmem is not supported */
431 __flush_dcache_icache(page_address(page));
432#else
433 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
434#endif
435
436}
437void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
438{
439 clear_page(page);
440
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000441 /*
442 * We shouldnt have to do this, but some versions of glibc
443 * require it (ld.so assumes zero filled pages are icache clean)
444 * - Anton
445 */
David Gibson09f5dc42006-02-06 13:24:53 +1100446 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000447}
448EXPORT_SYMBOL(clear_user_page);
449
450void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
451 struct page *pg)
452{
453 copy_page(vto, vfrom);
454
455 /*
456 * We should be able to use the following optimisation, however
457 * there are two problems.
458 * Firstly a bug in some versions of binutils meant PLT sections
459 * were not marked executable.
460 * Secondly the first word in the GOT section is blrl, used
461 * to establish the GOT address. Until recently the GOT was
462 * not marked executable.
463 * - Anton
464 */
465#if 0
466 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
467 return;
468#endif
469
David Gibson09f5dc42006-02-06 13:24:53 +1100470 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000471}
472
473void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
474 unsigned long addr, int len)
475{
476 unsigned long maddr;
477
478 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
479 flush_icache_range(maddr, maddr + len);
480 kunmap(page);
481}
482EXPORT_SYMBOL(flush_icache_user_range);
483
484/*
485 * This is called at the end of handling a user page fault, when the
486 * fault has been handled by updating a PTE in the linux page tables.
487 * We use it to preload an HPTE into the hash table corresponding to
488 * the updated linux PTE.
489 *
Hugh Dickins01edcd82005-11-23 13:37:39 -0800490 * This must always be called with the pte lock held.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000491 */
492void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
493 pte_t pte)
494{
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100495#ifdef CONFIG_PPC_STD_MMU
496 unsigned long access = 0, trap;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000497#endif
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100498 unsigned long pfn = pte_pfn(pte);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000499
500 /* handle i-cache coherency */
501 if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
502 !cpu_has_feature(CPU_FTR_NOEXECUTE) &&
503 pfn_valid(pfn)) {
504 struct page *page = pfn_to_page(pfn);
Vitaly Bordugdbbb06b2007-01-24 22:40:57 +0300505#ifdef CONFIG_8xx
506 /* On 8xx, cache control instructions (particularly
507 * "dcbst" from flush_dcache_icache) fault as write
508 * operation if there is an unpopulated TLB entry
509 * for the address in question. To workaround that,
510 * we invalidate the TLB here, thus avoiding dcbst
511 * misbehaviour.
512 */
513 _tlbie(address);
514#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000515 if (!PageReserved(page)
516 && !test_bit(PG_arch_1, &page->flags)) {
517 if (vma->vm_mm == current->active_mm) {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000518 __flush_dcache_icache((void *) address);
519 } else
520 flush_dcache_icache_page(page);
521 set_bit(PG_arch_1, &page->flags);
522 }
523 }
524
525#ifdef CONFIG_PPC_STD_MMU
526 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
527 if (!pte_young(pte) || address >= TASK_SIZE)
528 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100529
530 /* We try to figure out if we are coming from an instruction
531 * access fault and pass that down to __hash_page so we avoid
532 * double-faulting on execution of fresh text. We have to test
533 * for regs NULL since init will get here first thing at boot
534 *
535 * We also avoid filling the hash if not coming from a fault
536 */
537 if (current->thread.regs == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000538 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100539 trap = TRAP(current->thread.regs);
540 if (trap == 0x400)
541 access |= _PAGE_EXEC;
542 else if (trap != 0x300)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000543 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100544 hash_preload(vma->vm_mm, address, access, trap);
545#endif /* CONFIG_PPC_STD_MMU */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000546}