blob: b9b152558f9c5de64d70399a37c1aa7dfd001706 [file] [log] [blame]
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>
David Gibson0895ecd2009-10-26 19:24:31 +000035#include <linux/hugetlb.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100036
37#include <asm/pgalloc.h>
38#include <asm/prom.h>
39#include <asm/io.h>
40#include <asm/mmu_context.h>
41#include <asm/pgtable.h>
42#include <asm/mmu.h>
43#include <asm/smp.h>
44#include <asm/machdep.h>
45#include <asm/btext.h>
46#include <asm/tlb.h>
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100047#include <asm/sections.h>
Tony Breedsdb7f37d2008-07-01 11:30:06 +100048#include <asm/sparsemem.h>
Paul Mackerrasab1f9da2005-10-10 21:58:35 +100049#include <asm/vdso.h>
Kumar Gala2c419bd2008-04-23 23:05:20 +100050#include <asm/fixmap.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100051
Paul Mackerras14cf11a2005-09-26 16:04:21 +100052#include "mmu_decl.h"
53
54#ifndef CPU_FTR_COHERENT_ICACHE
55#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56#define CPU_FTR_NOEXECUTE 0
57#endif
58
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100059int init_bootmem_done;
60int mem_init_done;
Becky Bruce49a84962009-05-08 12:19:27 +000061phys_addr_t memory_limit;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100062
Kumar Gala2c419bd2008-04-23 23:05:20 +100063#ifdef CONFIG_HIGHMEM
64pte_t *kmap_pte;
65pgprot_t kmap_prot;
66
67EXPORT_SYMBOL(kmap_prot);
68EXPORT_SYMBOL(kmap_pte);
69
70static inline pte_t *virt_to_kpte(unsigned long vaddr)
71{
72 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
73 vaddr), vaddr), vaddr);
74}
75#endif
76
Paul Mackerras14cf11a2005-09-26 16:04:21 +100077int page_is_ram(unsigned long pfn)
78{
Paul Mackerras14cf11a2005-09-26 16:04:21 +100079#ifndef CONFIG_PPC64 /* XXX for now */
Roland Dreiera880e762008-09-15 10:43:35 +000080 return pfn < max_pfn;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100081#else
Roland Dreiera880e762008-09-15 10:43:35 +000082 unsigned long paddr = (pfn << PAGE_SHIFT);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100083 int i;
84 for (i=0; i < lmb.memory.cnt; i++) {
85 unsigned long base;
86
87 base = lmb.memory.region[i].base;
88
89 if ((paddr >= base) &&
90 (paddr < (base + lmb.memory.region[i].size))) {
91 return 1;
92 }
93 }
94
95 return 0;
96#endif
97}
Paul Mackerras14cf11a2005-09-26 16:04:21 +100098
Roland Dreier8b150472005-10-28 17:46:18 -070099pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000100 unsigned long size, pgprot_t vma_prot)
101{
102 if (ppc_md.phys_mem_access_prot)
Roland Dreier8b150472005-10-28 17:46:18 -0700103 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000104
Roland Dreier8b150472005-10-28 17:46:18 -0700105 if (!page_is_ram(pfn))
Benjamin Herrenschmidt64b3d0e2008-12-18 19:13:51 +0000106 vma_prot = pgprot_noncached(vma_prot);
107
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000108 return vma_prot;
109}
110EXPORT_SYMBOL(phys_mem_access_prot);
111
Paul Mackerras23fd0772005-10-31 13:37:12 +1100112#ifdef CONFIG_MEMORY_HOTPLUG
113
Yasunori Gotobc02af92006-06-27 02:53:30 -0700114#ifdef CONFIG_NUMA
115int memory_add_physaddr_to_nid(u64 start)
116{
117 return hot_add_scn_to_nid(start);
118}
119#endif
120
Geert Uytterhoevenfa90f702008-03-29 03:10:50 +1100121int arch_add_memory(int nid, u64 start, u64 size)
Paul Mackerras23fd0772005-10-31 13:37:12 +1100122{
Mike Kravetz237a0982005-12-05 12:06:42 -0800123 struct pglist_data *pgdata;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100124 struct zone *zone;
125 unsigned long start_pfn = start >> PAGE_SHIFT;
126 unsigned long nr_pages = size >> PAGE_SHIFT;
127
Mike Kravetz237a0982005-12-05 12:06:42 -0800128 pgdata = NODE_DATA(nid);
129
Andrew Morton2d0eee12006-03-21 23:00:05 -0800130 start = (unsigned long)__va(start);
Mike Kravetz54b79242005-11-07 16:25:48 -0800131 create_section_mapping(start, start + size);
132
Paul Mackerras23fd0772005-10-31 13:37:12 +1100133 /* this should work for most non-highmem platforms */
134 zone = pgdata->node_zones;
135
Gary Hadec04fc582009-01-06 14:39:14 -0800136 return __add_pages(nid, zone, start_pfn, nr_pages);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100137}
Nathan Lynch0d579942008-06-04 08:30:54 +1000138#endif /* CONFIG_MEMORY_HOTPLUG */
Badari Pulavartya99824f2008-02-05 00:10:18 -0800139
140/*
141 * walk_memory_resource() needs to make sure there is no holes in a given
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700142 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
143 * Instead it maintains it in lmb.memory structures. Walk through the
144 * memory regions, find holes and callback for contiguous regions.
Badari Pulavartya99824f2008-02-05 00:10:18 -0800145 */
146int
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700147walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
148 void *arg, int (*func)(unsigned long, unsigned long, void *))
Badari Pulavartya99824f2008-02-05 00:10:18 -0800149{
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700150 struct lmb_property res;
151 unsigned long pfn, len;
152 u64 end;
153 int ret = -1;
154
155 res.base = (u64) start_pfn << PAGE_SHIFT;
156 res.size = (u64) nr_pages << PAGE_SHIFT;
157
158 end = res.base + res.size - 1;
159 while ((res.base < end) && (lmb_find(&res) >= 0)) {
160 pfn = (unsigned long)(res.base >> PAGE_SHIFT);
161 len = (unsigned long)(res.size >> PAGE_SHIFT);
162 ret = (*func)(pfn, len, arg);
163 if (ret)
164 break;
165 res.base += (res.size + 1);
166 res.size = (end - res.base + 1);
167 }
168 return ret;
Badari Pulavartya99824f2008-02-05 00:10:18 -0800169}
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700170EXPORT_SYMBOL_GPL(walk_system_ram_range);
Badari Pulavartya99824f2008-02-05 00:10:18 -0800171
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000172/*
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000173 * Initialize the bootmem system and give it all the memory we
174 * have available. If we are using highmem, we only put the
175 * lowmem into the bootmem system.
176 */
177#ifndef CONFIG_NEED_MULTIPLE_NODES
178void __init do_init_bootmem(void)
179{
180 unsigned long i;
181 unsigned long start, bootmap_pages;
182 unsigned long total_pages;
183 int boot_mapsize;
184
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000185 max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
Kumar Galad7917ba2008-04-16 05:52:22 +1000186 total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000187#ifdef CONFIG_HIGHMEM
188 total_pages = total_lowmem >> PAGE_SHIFT;
Kumar Galad7917ba2008-04-16 05:52:22 +1000189 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000190#endif
191
192 /*
193 * Find an area to use for the bootmem bitmap. Calculate the size of
194 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
195 * Add 1 additional page in case the address isn't page-aligned.
196 */
197 bootmap_pages = bootmem_bootmap_pages(total_pages);
198
199 start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000200
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000201 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
202 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000203
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700204 /* Add active regions with valid PFNs */
205 for (i = 0; i < lmb.memory.cnt; i++) {
206 unsigned long start_pfn, end_pfn;
207 start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
208 end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
209 add_active_range(0, start_pfn, end_pfn);
210 }
211
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000212 /* Add all physical memory to the bootmem map, mark each area
213 * present.
214 */
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000215#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000216 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600217
218 /* reserve the sections we're already using */
219 for (i = 0; i < lmb.reserved.cnt; i++) {
220 unsigned long addr = lmb.reserved.region[i].base +
221 lmb_size_bytes(&lmb.reserved, i) - 1;
Kumar Galad7917ba2008-04-16 05:52:22 +1000222 if (addr < lowmem_end_addr)
Kumar Galaf98eeb42008-01-09 11:27:23 -0600223 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800224 lmb_size_bytes(&lmb.reserved, i),
225 BOOTMEM_DEFAULT);
Kumar Galad7917ba2008-04-16 05:52:22 +1000226 else if (lmb.reserved.region[i].base < lowmem_end_addr) {
227 unsigned long adjusted_size = lowmem_end_addr -
Kumar Galaf98eeb42008-01-09 11:27:23 -0600228 lmb.reserved.region[i].base;
229 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800230 adjusted_size, BOOTMEM_DEFAULT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600231 }
232 }
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700233#else
234 free_bootmem_with_active_regions(0, max_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000235
236 /* reserve the sections we're already using */
237 for (i = 0; i < lmb.reserved.cnt; i++)
238 reserve_bootmem(lmb.reserved.region[i].base,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800239 lmb_size_bytes(&lmb.reserved, i),
240 BOOTMEM_DEFAULT);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000241
Kumar Galaf98eeb42008-01-09 11:27:23 -0600242#endif
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000243 /* XXX need to clip this if using highmem? */
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700244 sparse_memory_present_with_active_regions(0);
245
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000246 init_bootmem_done = 1;
247}
248
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000249/* mark pages that don't exist as nosave */
250static int __init mark_nonram_nosave(void)
251{
252 unsigned long lmb_next_region_start_pfn,
253 lmb_region_max_pfn;
254 int i;
255
256 for (i = 0; i < lmb.memory.cnt - 1; i++) {
257 lmb_region_max_pfn =
258 (lmb.memory.region[i].base >> PAGE_SHIFT) +
259 (lmb.memory.region[i].size >> PAGE_SHIFT);
260 lmb_next_region_start_pfn =
261 lmb.memory.region[i+1].base >> PAGE_SHIFT;
262
263 if (lmb_region_max_pfn < lmb_next_region_start_pfn)
264 register_nosave_region(lmb_region_max_pfn,
265 lmb_next_region_start_pfn);
266 }
267
268 return 0;
269}
270
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000271/*
272 * paging_init() sets up the page tables - in fact we've already done this.
273 */
274void __init paging_init(void)
275{
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000276 unsigned long total_ram = lmb_phys_mem_size();
Stefan Roese2bf30162008-07-10 01:09:23 +1000277 phys_addr_t top_of_ram = lmb_end_of_DRAM();
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700278 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000279
Kumar Gala2c419bd2008-04-23 23:05:20 +1000280#ifdef CONFIG_PPC32
281 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
282 unsigned long end = __fix_to_virt(FIX_HOLE);
283
284 for (; v < end; v += PAGE_SIZE)
285 map_page(v, 0, 0); /* XXX gross */
286#endif
287
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000288#ifdef CONFIG_HIGHMEM
289 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
Kumar Gala2c419bd2008-04-23 23:05:20 +1000290 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
291
292 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000293 kmap_prot = PAGE_KERNEL;
294#endif /* CONFIG_HIGHMEM */
295
Stefan Roese2bf30162008-07-10 01:09:23 +1000296 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n",
Tony Breedsfb610632008-07-31 13:51:42 +1000297 (unsigned long long)top_of_ram, total_ram);
Olof Johanssone110b282006-04-12 15:25:01 -0500298 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
Stefan Roese2bf30162008-07-10 01:09:23 +1000299 (long int)((top_of_ram - total_ram) >> 20));
Mel Gorman6391af12006-10-11 01:20:39 -0700300 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000301#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000302 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
Mel Gorman6391af12006-10-11 01:20:39 -0700303 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000304#else
Mel Gorman6391af12006-10-11 01:20:39 -0700305 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700306#endif
307 free_area_init_nodes(max_zone_pfns);
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000308
309 mark_nonram_nosave();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000310}
311#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
312
313void __init mem_init(void)
314{
315#ifdef CONFIG_NEED_MULTIPLE_NODES
316 int nid;
317#endif
318 pg_data_t *pgdat;
319 unsigned long i;
320 struct page *page;
321 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
322
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100323 num_physpages = lmb.memory.size >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000324 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
325
326#ifdef CONFIG_NEED_MULTIPLE_NODES
327 for_each_online_node(nid) {
328 if (NODE_DATA(nid)->node_spanned_pages != 0) {
Anton Blanchardc258dd42006-03-25 17:27:09 +1100329 printk("freeing bootmem node %d\n", nid);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000330 totalram_pages +=
331 free_all_bootmem_node(NODE_DATA(nid));
332 }
333 }
334#else
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100335 max_mapnr = max_pfn;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000336 totalram_pages += free_all_bootmem();
337#endif
KAMEZAWA Hiroyukiec936fc2006-03-27 01:15:59 -0800338 for_each_online_pgdat(pgdat) {
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000339 for (i = 0; i < pgdat->node_spanned_pages; i++) {
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100340 if (!pfn_valid(pgdat->node_start_pfn + i))
341 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000342 page = pgdat_page_nr(pgdat, i);
343 if (PageReserved(page))
344 reservedpages++;
345 }
346 }
347
348 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
Anton Blanchardbcb35572005-11-07 17:43:07 +1100349 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000350 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
351 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
352
353#ifdef CONFIG_HIGHMEM
354 {
355 unsigned long pfn, highmem_mapnr;
356
Kumar Galad7917ba2008-04-16 05:52:22 +1000357 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000358 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
359 struct page *page = pfn_to_page(pfn);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600360 if (lmb_is_reserved(pfn << PAGE_SHIFT))
361 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000362 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800363 init_page_count(page);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000364 __free_page(page);
365 totalhigh_pages++;
Kumar Galaf98eeb42008-01-09 11:27:23 -0600366 reservedpages--;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000367 }
368 totalram_pages += totalhigh_pages;
Olof Johanssone110b282006-04-12 15:25:01 -0500369 printk(KERN_DEBUG "High memory: %luk\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000370 totalhigh_pages << (PAGE_SHIFT-10));
371 }
372#endif /* CONFIG_HIGHMEM */
373
374 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
375 "%luk reserved, %luk data, %luk bss, %luk init)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700376 nr_free_pages() << (PAGE_SHIFT-10),
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000377 num_physpages << (PAGE_SHIFT-10),
378 codesize >> 10,
379 reservedpages << (PAGE_SHIFT-10),
380 datasize >> 10,
381 bsssize >> 10,
382 initsize >> 10);
383
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000384#ifdef CONFIG_PPC32
385 pr_info("Kernel virtual memory layout:\n");
386 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
387#ifdef CONFIG_HIGHMEM
388 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
389 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
390#endif /* CONFIG_HIGHMEM */
Benjamin Herrenschmidt8b31e492009-05-27 13:50:33 +1000391#ifdef CONFIG_NOT_COHERENT_CACHE
392 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
393 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
394#endif /* CONFIG_NOT_COHERENT_CACHE */
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000395 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
396 ioremap_bot, IOREMAP_TOP);
397 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
398 VMALLOC_START, VMALLOC_END);
399#endif /* CONFIG_PPC32 */
400
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000401 mem_init_done = 1;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000402}
403
404/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000405 * This is called when a page has been modified by the kernel.
406 * It just marks the page as not i-cache clean. We do the i-cache
407 * flush later when the page is given to a user process, if necessary.
408 */
409void flush_dcache_page(struct page *page)
410{
411 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
412 return;
413 /* avoid an atomic op if possible */
414 if (test_bit(PG_arch_1, &page->flags))
415 clear_bit(PG_arch_1, &page->flags);
416}
417EXPORT_SYMBOL(flush_dcache_page);
418
419void flush_dcache_icache_page(struct page *page)
420{
David Gibson0895ecd2009-10-26 19:24:31 +0000421#ifdef CONFIG_HUGETLB_PAGE
422 if (PageCompound(page)) {
423 flush_dcache_icache_hugepage(page);
424 return;
425 }
426#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000427#ifdef CONFIG_BOOKE
David Gibson0895ecd2009-10-26 19:24:31 +0000428 {
429 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
430 __flush_dcache_icache(start);
431 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
432 }
Paul Mackerrasab1f9da2005-10-10 21:58:35 +1000433#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000434 /* On 8xx there is no need to kmap since highmem is not supported */
435 __flush_dcache_icache(page_address(page));
436#else
437 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
438#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000439}
David Gibson0895ecd2009-10-26 19:24:31 +0000440
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000441void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
442{
443 clear_page(page);
444
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000445 /*
446 * We shouldnt have to do this, but some versions of glibc
447 * require it (ld.so assumes zero filled pages are icache clean)
448 * - Anton
449 */
David Gibson09f5dc42006-02-06 13:24:53 +1100450 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000451}
452EXPORT_SYMBOL(clear_user_page);
453
454void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
455 struct page *pg)
456{
457 copy_page(vto, vfrom);
458
459 /*
460 * We should be able to use the following optimisation, however
461 * there are two problems.
462 * Firstly a bug in some versions of binutils meant PLT sections
463 * were not marked executable.
464 * Secondly the first word in the GOT section is blrl, used
465 * to establish the GOT address. Until recently the GOT was
466 * not marked executable.
467 * - Anton
468 */
469#if 0
470 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
471 return;
472#endif
473
David Gibson09f5dc42006-02-06 13:24:53 +1100474 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000475}
476
477void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
478 unsigned long addr, int len)
479{
480 unsigned long maddr;
481
482 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
483 flush_icache_range(maddr, maddr + len);
484 kunmap(page);
485}
486EXPORT_SYMBOL(flush_icache_user_range);
487
488/*
489 * This is called at the end of handling a user page fault, when the
490 * fault has been handled by updating a PTE in the linux page tables.
491 * We use it to preload an HPTE into the hash table corresponding to
492 * the updated linux PTE.
493 *
Hugh Dickins01edcd82005-11-23 13:37:39 -0800494 * This must always be called with the pte lock held.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000495 */
496void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
497 pte_t pte)
498{
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100499#ifdef CONFIG_PPC_STD_MMU
500 unsigned long access = 0, trap;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000501
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000502 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
503 if (!pte_young(pte) || address >= TASK_SIZE)
504 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100505
506 /* We try to figure out if we are coming from an instruction
507 * access fault and pass that down to __hash_page so we avoid
508 * double-faulting on execution of fresh text. We have to test
509 * for regs NULL since init will get here first thing at boot
510 *
511 * We also avoid filling the hash if not coming from a fault
512 */
513 if (current->thread.regs == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000514 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100515 trap = TRAP(current->thread.regs);
516 if (trap == 0x400)
517 access |= _PAGE_EXEC;
518 else if (trap != 0x300)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000519 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100520 hash_preload(vma->vm_mm, address, access, trap);
521#endif /* CONFIG_PPC_STD_MMU */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000522}