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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>
David S. Millerd9b2b2a2008-02-13 16:56:49 -080034#include <linux/lmb.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100035
36#include <asm/pgalloc.h>
37#include <asm/prom.h>
38#include <asm/io.h>
39#include <asm/mmu_context.h>
40#include <asm/pgtable.h>
41#include <asm/mmu.h>
42#include <asm/smp.h>
43#include <asm/machdep.h>
44#include <asm/btext.h>
45#include <asm/tlb.h>
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100046#include <asm/sections.h>
Tony Breedsdb7f37d2008-07-01 11:30:06 +100047#include <asm/sparsemem.h>
Paul Mackerrasab1f9da2005-10-10 21:58:35 +100048#include <asm/vdso.h>
Kumar Gala2c419bd2008-04-23 23:05:20 +100049#include <asm/fixmap.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100050
Paul Mackerras14cf11a2005-09-26 16:04:21 +100051#include "mmu_decl.h"
52
53#ifndef CPU_FTR_COHERENT_ICACHE
54#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
55#define CPU_FTR_NOEXECUTE 0
56#endif
57
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100058int init_bootmem_done;
59int mem_init_done;
Paul Mackerrascf00a8d2005-10-31 13:07:02 +110060unsigned long memory_limit;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100061
Kumar Gala2c419bd2008-04-23 23:05:20 +100062#ifdef CONFIG_HIGHMEM
63pte_t *kmap_pte;
64pgprot_t kmap_prot;
65
66EXPORT_SYMBOL(kmap_prot);
67EXPORT_SYMBOL(kmap_pte);
68
69static inline pte_t *virt_to_kpte(unsigned long vaddr)
70{
71 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
72 vaddr), vaddr), vaddr);
73}
74#endif
75
Paul Mackerras14cf11a2005-09-26 16:04:21 +100076int page_is_ram(unsigned long pfn)
77{
Paul Mackerras14cf11a2005-09-26 16:04:21 +100078#ifndef CONFIG_PPC64 /* XXX for now */
Roland Dreiera880e762008-09-15 10:43:35 +000079 return pfn < max_pfn;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100080#else
Roland Dreiera880e762008-09-15 10:43:35 +000081 unsigned long paddr = (pfn << PAGE_SHIFT);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100082 int i;
83 for (i=0; i < lmb.memory.cnt; i++) {
84 unsigned long base;
85
86 base = lmb.memory.region[i].base;
87
88 if ((paddr >= base) &&
89 (paddr < (base + lmb.memory.region[i].size))) {
90 return 1;
91 }
92 }
93
94 return 0;
95#endif
96}
Paul Mackerras14cf11a2005-09-26 16:04:21 +100097
Roland Dreier8b150472005-10-28 17:46:18 -070098pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
Paul Mackerras14cf11a2005-09-26 16:04:21 +100099 unsigned long size, pgprot_t vma_prot)
100{
101 if (ppc_md.phys_mem_access_prot)
Roland Dreier8b150472005-10-28 17:46:18 -0700102 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000103
Roland Dreier8b150472005-10-28 17:46:18 -0700104 if (!page_is_ram(pfn))
Benjamin Herrenschmidt64b3d0e2008-12-18 19:13:51 +0000105 vma_prot = pgprot_noncached(vma_prot);
106
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000107 return vma_prot;
108}
109EXPORT_SYMBOL(phys_mem_access_prot);
110
Paul Mackerras23fd0772005-10-31 13:37:12 +1100111#ifdef CONFIG_MEMORY_HOTPLUG
112
Yasunori Gotobc02af92006-06-27 02:53:30 -0700113#ifdef CONFIG_NUMA
114int memory_add_physaddr_to_nid(u64 start)
115{
116 return hot_add_scn_to_nid(start);
117}
118#endif
119
Geert Uytterhoevenfa90f702008-03-29 03:10:50 +1100120int arch_add_memory(int nid, u64 start, u64 size)
Paul Mackerras23fd0772005-10-31 13:37:12 +1100121{
Mike Kravetz237a0982005-12-05 12:06:42 -0800122 struct pglist_data *pgdata;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100123 struct zone *zone;
124 unsigned long start_pfn = start >> PAGE_SHIFT;
125 unsigned long nr_pages = size >> PAGE_SHIFT;
126
Mike Kravetz237a0982005-12-05 12:06:42 -0800127 pgdata = NODE_DATA(nid);
128
Andrew Morton2d0eee12006-03-21 23:00:05 -0800129 start = (unsigned long)__va(start);
Mike Kravetz54b79242005-11-07 16:25:48 -0800130 create_section_mapping(start, start + size);
131
Paul Mackerras23fd0772005-10-31 13:37:12 +1100132 /* this should work for most non-highmem platforms */
133 zone = pgdata->node_zones;
134
135 return __add_pages(zone, start_pfn, nr_pages);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100136}
Nathan Lynch0d579942008-06-04 08:30:54 +1000137#endif /* CONFIG_MEMORY_HOTPLUG */
Badari Pulavartya99824f2008-02-05 00:10:18 -0800138
139/*
140 * walk_memory_resource() needs to make sure there is no holes in a given
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700141 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
142 * Instead it maintains it in lmb.memory structures. Walk through the
143 * memory regions, find holes and callback for contiguous regions.
Badari Pulavartya99824f2008-02-05 00:10:18 -0800144 */
145int
146walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
147 int (*func)(unsigned long, unsigned long, void *))
148{
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700149 struct lmb_property res;
150 unsigned long pfn, len;
151 u64 end;
152 int ret = -1;
153
154 res.base = (u64) start_pfn << PAGE_SHIFT;
155 res.size = (u64) nr_pages << PAGE_SHIFT;
156
157 end = res.base + res.size - 1;
158 while ((res.base < end) && (lmb_find(&res) >= 0)) {
159 pfn = (unsigned long)(res.base >> PAGE_SHIFT);
160 len = (unsigned long)(res.size >> PAGE_SHIFT);
161 ret = (*func)(pfn, len, arg);
162 if (ret)
163 break;
164 res.base += (res.size + 1);
165 res.size = (end - res.base + 1);
166 }
167 return ret;
Badari Pulavartya99824f2008-02-05 00:10:18 -0800168}
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700169EXPORT_SYMBOL_GPL(walk_memory_resource);
Badari Pulavartya99824f2008-02-05 00:10:18 -0800170
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000171/*
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000172 * Initialize the bootmem system and give it all the memory we
173 * have available. If we are using highmem, we only put the
174 * lowmem into the bootmem system.
175 */
176#ifndef CONFIG_NEED_MULTIPLE_NODES
177void __init do_init_bootmem(void)
178{
179 unsigned long i;
180 unsigned long start, bootmap_pages;
181 unsigned long total_pages;
182 int boot_mapsize;
183
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000184 max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
Kumar Galad7917ba2008-04-16 05:52:22 +1000185 total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000186#ifdef CONFIG_HIGHMEM
187 total_pages = total_lowmem >> PAGE_SHIFT;
Kumar Galad7917ba2008-04-16 05:52:22 +1000188 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000189#endif
190
191 /*
192 * Find an area to use for the bootmem bitmap. Calculate the size of
193 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
194 * Add 1 additional page in case the address isn't page-aligned.
195 */
196 bootmap_pages = bootmem_bootmap_pages(total_pages);
197
198 start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000199
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000200 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
201 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000202
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700203 /* Add active regions with valid PFNs */
204 for (i = 0; i < lmb.memory.cnt; i++) {
205 unsigned long start_pfn, end_pfn;
206 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
207 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
208 add_active_range(0, start_pfn, end_pfn);
209 }
210
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000211 /* Add all physical memory to the bootmem map, mark each area
212 * present.
213 */
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000214#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000215 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600216
217 /* reserve the sections we're already using */
218 for (i = 0; i < lmb.reserved.cnt; i++) {
219 unsigned long addr = lmb.reserved.region[i].base +
220 lmb_size_bytes(&lmb.reserved, i) - 1;
Kumar Galad7917ba2008-04-16 05:52:22 +1000221 if (addr < lowmem_end_addr)
Kumar Galaf98eeb42008-01-09 11:27:23 -0600222 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800223 lmb_size_bytes(&lmb.reserved, i),
224 BOOTMEM_DEFAULT);
Kumar Galad7917ba2008-04-16 05:52:22 +1000225 else if (lmb.reserved.region[i].base < lowmem_end_addr) {
226 unsigned long adjusted_size = lowmem_end_addr -
Kumar Galaf98eeb42008-01-09 11:27:23 -0600227 lmb.reserved.region[i].base;
228 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800229 adjusted_size, BOOTMEM_DEFAULT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600230 }
231 }
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700232#else
233 free_bootmem_with_active_regions(0, max_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000234
235 /* reserve the sections we're already using */
236 for (i = 0; i < lmb.reserved.cnt; i++)
237 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800238 lmb_size_bytes(&lmb.reserved, i),
239 BOOTMEM_DEFAULT);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000240
Kumar Galaf98eeb42008-01-09 11:27:23 -0600241#endif
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000242 /* XXX need to clip this if using highmem? */
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700243 sparse_memory_present_with_active_regions(0);
244
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000245 init_bootmem_done = 1;
246}
247
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000248/* mark pages that don't exist as nosave */
249static int __init mark_nonram_nosave(void)
250{
251 unsigned long lmb_next_region_start_pfn,
252 lmb_region_max_pfn;
253 int i;
254
255 for (i = 0; i < lmb.memory.cnt - 1; i++) {
256 lmb_region_max_pfn =
257 (lmb.memory.region[i].base >> PAGE_SHIFT) +
258 (lmb.memory.region[i].size >> PAGE_SHIFT);
259 lmb_next_region_start_pfn =
260 lmb.memory.region[i+1].base >> PAGE_SHIFT;
261
262 if (lmb_region_max_pfn < lmb_next_region_start_pfn)
263 register_nosave_region(lmb_region_max_pfn,
264 lmb_next_region_start_pfn);
265 }
266
267 return 0;
268}
269
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000270/*
271 * paging_init() sets up the page tables - in fact we've already done this.
272 */
273void __init paging_init(void)
274{
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000275 unsigned long total_ram = lmb_phys_mem_size();
Stefan Roese2bf30162008-07-10 01:09:23 +1000276 phys_addr_t top_of_ram = lmb_end_of_DRAM();
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700277 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000278
Kumar Gala2c419bd2008-04-23 23:05:20 +1000279#ifdef CONFIG_PPC32
280 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
281 unsigned long end = __fix_to_virt(FIX_HOLE);
282
283 for (; v < end; v += PAGE_SIZE)
284 map_page(v, 0, 0); /* XXX gross */
285#endif
286
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000287#ifdef CONFIG_HIGHMEM
288 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
Kumar Gala2c419bd2008-04-23 23:05:20 +1000289 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
290
291 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000292 kmap_prot = PAGE_KERNEL;
293#endif /* CONFIG_HIGHMEM */
294
Stefan Roese2bf30162008-07-10 01:09:23 +1000295 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n",
Tony Breedsfb610632008-07-31 13:51:42 +1000296 (unsigned long long)top_of_ram, total_ram);
Olof Johanssone110b282006-04-12 15:25:01 -0500297 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
Stefan Roese2bf30162008-07-10 01:09:23 +1000298 (long int)((top_of_ram - total_ram) >> 20));
Mel Gorman6391af12006-10-11 01:20:39 -0700299 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000300#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000301 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
Mel Gorman6391af12006-10-11 01:20:39 -0700302 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000303#else
Mel Gorman6391af12006-10-11 01:20:39 -0700304 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700305#endif
306 free_area_init_nodes(max_zone_pfns);
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000307
308 mark_nonram_nosave();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000309}
310#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
311
312void __init mem_init(void)
313{
314#ifdef CONFIG_NEED_MULTIPLE_NODES
315 int nid;
316#endif
317 pg_data_t *pgdat;
318 unsigned long i;
319 struct page *page;
320 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
321
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100322 num_physpages = lmb.memory.size >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000323 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
324
325#ifdef CONFIG_NEED_MULTIPLE_NODES
326 for_each_online_node(nid) {
327 if (NODE_DATA(nid)->node_spanned_pages != 0) {
Anton Blanchardc258dd42006-03-25 17:27:09 +1100328 printk("freeing bootmem node %d\n", nid);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000329 totalram_pages +=
330 free_all_bootmem_node(NODE_DATA(nid));
331 }
332 }
333#else
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100334 max_mapnr = max_pfn;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000335 totalram_pages += free_all_bootmem();
336#endif
KAMEZAWA Hiroyukiec936fc2006-03-27 01:15:59 -0800337 for_each_online_pgdat(pgdat) {
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000338 for (i = 0; i < pgdat->node_spanned_pages; i++) {
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100339 if (!pfn_valid(pgdat->node_start_pfn + i))
340 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000341 page = pgdat_page_nr(pgdat, i);
342 if (PageReserved(page))
343 reservedpages++;
344 }
345 }
346
347 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
Anton Blanchardbcb35572005-11-07 17:43:07 +1100348 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000349 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
350 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
351
352#ifdef CONFIG_HIGHMEM
353 {
354 unsigned long pfn, highmem_mapnr;
355
Kumar Galad7917ba2008-04-16 05:52:22 +1000356 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000357 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
358 struct page *page = pfn_to_page(pfn);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600359 if (lmb_is_reserved(pfn << PAGE_SHIFT))
360 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000361 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800362 init_page_count(page);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000363 __free_page(page);
364 totalhigh_pages++;
Kumar Galaf98eeb42008-01-09 11:27:23 -0600365 reservedpages--;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000366 }
367 totalram_pages += totalhigh_pages;
Olof Johanssone110b282006-04-12 15:25:01 -0500368 printk(KERN_DEBUG "High memory: %luk\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000369 totalhigh_pages << (PAGE_SHIFT-10));
370 }
371#endif /* CONFIG_HIGHMEM */
372
373 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
374 "%luk reserved, %luk data, %luk bss, %luk init)\n",
375 (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
376 num_physpages << (PAGE_SHIFT-10),
377 codesize >> 10,
378 reservedpages << (PAGE_SHIFT-10),
379 datasize >> 10,
380 bsssize >> 10,
381 initsize >> 10);
382
383 mem_init_done = 1;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000384}
385
386/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000387 * This is called when a page has been modified by the kernel.
388 * It just marks the page as not i-cache clean. We do the i-cache
389 * flush later when the page is given to a user process, if necessary.
390 */
391void flush_dcache_page(struct page *page)
392{
393 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
394 return;
395 /* avoid an atomic op if possible */
396 if (test_bit(PG_arch_1, &page->flags))
397 clear_bit(PG_arch_1, &page->flags);
398}
399EXPORT_SYMBOL(flush_dcache_page);
400
401void flush_dcache_icache_page(struct page *page)
402{
403#ifdef CONFIG_BOOKE
404 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
405 __flush_dcache_icache(start);
406 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
Paul Mackerrasab1f9da2005-10-10 21:58:35 +1000407#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000408 /* On 8xx there is no need to kmap since highmem is not supported */
409 __flush_dcache_icache(page_address(page));
410#else
411 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
412#endif
413
414}
415void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
416{
417 clear_page(page);
418
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000419 /*
420 * We shouldnt have to do this, but some versions of glibc
421 * require it (ld.so assumes zero filled pages are icache clean)
422 * - Anton
423 */
David Gibson09f5dc42006-02-06 13:24:53 +1100424 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000425}
426EXPORT_SYMBOL(clear_user_page);
427
428void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
429 struct page *pg)
430{
431 copy_page(vto, vfrom);
432
433 /*
434 * We should be able to use the following optimisation, however
435 * there are two problems.
436 * Firstly a bug in some versions of binutils meant PLT sections
437 * were not marked executable.
438 * Secondly the first word in the GOT section is blrl, used
439 * to establish the GOT address. Until recently the GOT was
440 * not marked executable.
441 * - Anton
442 */
443#if 0
444 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
445 return;
446#endif
447
David Gibson09f5dc42006-02-06 13:24:53 +1100448 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000449}
450
451void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
452 unsigned long addr, int len)
453{
454 unsigned long maddr;
455
456 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
457 flush_icache_range(maddr, maddr + len);
458 kunmap(page);
459}
460EXPORT_SYMBOL(flush_icache_user_range);
461
462/*
463 * This is called at the end of handling a user page fault, when the
464 * fault has been handled by updating a PTE in the linux page tables.
465 * We use it to preload an HPTE into the hash table corresponding to
466 * the updated linux PTE.
467 *
Hugh Dickins01edcd82005-11-23 13:37:39 -0800468 * This must always be called with the pte lock held.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000469 */
470void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
471 pte_t pte)
472{
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100473#ifdef CONFIG_PPC_STD_MMU
474 unsigned long access = 0, trap;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000475#endif
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100476 unsigned long pfn = pte_pfn(pte);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000477
478 /* handle i-cache coherency */
479 if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
480 !cpu_has_feature(CPU_FTR_NOEXECUTE) &&
481 pfn_valid(pfn)) {
482 struct page *page = pfn_to_page(pfn);
Vitaly Bordugdbbb06b2007-01-24 22:40:57 +0300483#ifdef CONFIG_8xx
484 /* On 8xx, cache control instructions (particularly
485 * "dcbst" from flush_dcache_icache) fault as write
486 * operation if there is an unpopulated TLB entry
487 * for the address in question. To workaround that,
488 * we invalidate the TLB here, thus avoiding dcbst
489 * misbehaviour.
490 */
Benjamin Herrenschmidtf048aac2008-12-18 19:13:38 +0000491 _tlbil_va(address, 0 /* 8xx doesn't care about PID */);
Vitaly Bordugdbbb06b2007-01-24 22:40:57 +0300492#endif
Scott Wood551ed332008-02-06 06:43:26 +1100493 /* The _PAGE_USER test should really be _PAGE_EXEC, but
494 * older glibc versions execute some code from no-exec
495 * pages, which for now we are supporting. If exec-only
496 * pages are ever implemented, this will have to change.
497 */
498 if (!PageReserved(page) && (pte_val(pte) & _PAGE_USER)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000499 && !test_bit(PG_arch_1, &page->flags)) {
500 if (vma->vm_mm == current->active_mm) {
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000501 __flush_dcache_icache((void *) address);
502 } else
503 flush_dcache_icache_page(page);
504 set_bit(PG_arch_1, &page->flags);
505 }
506 }
507
508#ifdef CONFIG_PPC_STD_MMU
509 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
510 if (!pte_young(pte) || address >= TASK_SIZE)
511 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100512
513 /* We try to figure out if we are coming from an instruction
514 * access fault and pass that down to __hash_page so we avoid
515 * double-faulting on execution of fresh text. We have to test
516 * for regs NULL since init will get here first thing at boot
517 *
518 * We also avoid filling the hash if not coming from a fault
519 */
520 if (current->thread.regs == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000521 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100522 trap = TRAP(current->thread.regs);
523 if (trap == 0x400)
524 access |= _PAGE_EXEC;
525 else if (trap != 0x300)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000526 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100527 hash_preload(vma->vm_mm, address, access, trap);
528#endif /* CONFIG_PPC_STD_MMU */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000529}