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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/gfp.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100026#include <linux/types.h>
27#include <linux/mm.h>
28#include <linux/stddef.h>
29#include <linux/init.h>
30#include <linux/bootmem.h>
31#include <linux/highmem.h>
32#include <linux/initrd.h>
33#include <linux/pagemap.h>
Johannes Berg4e8ad3e2007-05-08 19:25:00 +100034#include <linux/suspend.h>
Yinghai Lu95f72d12010-07-12 14:36:09 +100035#include <linux/memblock.h>
David Gibson0895ecd2009-10-26 19:24:31 +000036#include <linux/hugetlb.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100037
38#include <asm/pgalloc.h>
39#include <asm/prom.h>
40#include <asm/io.h>
41#include <asm/mmu_context.h>
42#include <asm/pgtable.h>
43#include <asm/mmu.h>
44#include <asm/smp.h>
45#include <asm/machdep.h>
46#include <asm/btext.h>
47#include <asm/tlb.h>
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100048#include <asm/sections.h>
Tony Breedsdb7f37d2008-07-01 11:30:06 +100049#include <asm/sparsemem.h>
Paul Mackerrasab1f9da2005-10-10 21:58:35 +100050#include <asm/vdso.h>
Kumar Gala2c419bd2008-04-23 23:05:20 +100051#include <asm/fixmap.h>
FUJITA Tomonoria9327292010-03-16 13:16:25 +000052#include <asm/swiotlb.h>
Paul Mackerras14cf11a2005-09-26 16:04:21 +100053
Paul Mackerras14cf11a2005-09-26 16:04:21 +100054#include "mmu_decl.h"
55
56#ifndef CPU_FTR_COHERENT_ICACHE
57#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
58#define CPU_FTR_NOEXECUTE 0
59#endif
60
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100061int init_bootmem_done;
62int mem_init_done;
Becky Bruce49a84962009-05-08 12:19:27 +000063phys_addr_t memory_limit;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +100064
Kumar Gala2c419bd2008-04-23 23:05:20 +100065#ifdef CONFIG_HIGHMEM
66pte_t *kmap_pte;
67pgprot_t kmap_prot;
68
69EXPORT_SYMBOL(kmap_prot);
70EXPORT_SYMBOL(kmap_pte);
71
72static inline pte_t *virt_to_kpte(unsigned long vaddr)
73{
74 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
75 vaddr), vaddr), vaddr);
76}
77#endif
78
Paul Mackerras14cf11a2005-09-26 16:04:21 +100079int page_is_ram(unsigned long pfn)
80{
Paul Mackerras14cf11a2005-09-26 16:04:21 +100081#ifndef CONFIG_PPC64 /* XXX for now */
Roland Dreiera880e762008-09-15 10:43:35 +000082 return pfn < max_pfn;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100083#else
Roland Dreiera880e762008-09-15 10:43:35 +000084 unsigned long paddr = (pfn << PAGE_SHIFT);
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +100085 struct memblock_region *reg;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100086
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +100087 for_each_memblock(memory, reg)
88 if (paddr >= reg->base && paddr < (reg->base + reg->size))
Paul Mackerras14cf11a2005-09-26 16:04:21 +100089 return 1;
Paul Mackerras14cf11a2005-09-26 16:04:21 +100090 return 0;
91#endif
92}
Paul Mackerras14cf11a2005-09-26 16:04:21 +100093
Roland Dreier8b150472005-10-28 17:46:18 -070094pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
Paul Mackerras14cf11a2005-09-26 16:04:21 +100095 unsigned long size, pgprot_t vma_prot)
96{
97 if (ppc_md.phys_mem_access_prot)
Roland Dreier8b150472005-10-28 17:46:18 -070098 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
Paul Mackerras14cf11a2005-09-26 16:04:21 +100099
Roland Dreier8b150472005-10-28 17:46:18 -0700100 if (!page_is_ram(pfn))
Benjamin Herrenschmidt64b3d0e2008-12-18 19:13:51 +0000101 vma_prot = pgprot_noncached(vma_prot);
102
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000103 return vma_prot;
104}
105EXPORT_SYMBOL(phys_mem_access_prot);
106
Paul Mackerras23fd0772005-10-31 13:37:12 +1100107#ifdef CONFIG_MEMORY_HOTPLUG
108
Yasunori Gotobc02af92006-06-27 02:53:30 -0700109#ifdef CONFIG_NUMA
110int memory_add_physaddr_to_nid(u64 start)
111{
112 return hot_add_scn_to_nid(start);
113}
114#endif
115
Geert Uytterhoevenfa90f702008-03-29 03:10:50 +1100116int arch_add_memory(int nid, u64 start, u64 size)
Paul Mackerras23fd0772005-10-31 13:37:12 +1100117{
Mike Kravetz237a0982005-12-05 12:06:42 -0800118 struct pglist_data *pgdata;
Paul Mackerras23fd0772005-10-31 13:37:12 +1100119 struct zone *zone;
120 unsigned long start_pfn = start >> PAGE_SHIFT;
121 unsigned long nr_pages = size >> PAGE_SHIFT;
122
Mike Kravetz237a0982005-12-05 12:06:42 -0800123 pgdata = NODE_DATA(nid);
124
Andrew Morton2d0eee12006-03-21 23:00:05 -0800125 start = (unsigned long)__va(start);
Mike Kravetz54b79242005-11-07 16:25:48 -0800126 create_section_mapping(start, start + size);
127
Paul Mackerras23fd0772005-10-31 13:37:12 +1100128 /* this should work for most non-highmem platforms */
129 zone = pgdata->node_zones;
130
Gary Hadec04fc582009-01-06 14:39:14 -0800131 return __add_pages(nid, zone, start_pfn, nr_pages);
Paul Mackerras23fd0772005-10-31 13:37:12 +1100132}
Nathan Lynch0d579942008-06-04 08:30:54 +1000133#endif /* CONFIG_MEMORY_HOTPLUG */
Badari Pulavartya99824f2008-02-05 00:10:18 -0800134
135/*
136 * walk_memory_resource() needs to make sure there is no holes in a given
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700137 * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
Yinghai Lu95f72d12010-07-12 14:36:09 +1000138 * Instead it maintains it in memblock.memory structures. Walk through the
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700139 * memory regions, find holes and callback for contiguous regions.
Badari Pulavartya99824f2008-02-05 00:10:18 -0800140 */
141int
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700142walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
143 void *arg, int (*func)(unsigned long, unsigned long, void *))
Badari Pulavartya99824f2008-02-05 00:10:18 -0800144{
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000145 struct memblock_region *reg;
146 unsigned long end_pfn = start_pfn + nr_pages;
147 unsigned long tstart, tend;
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700148 int ret = -1;
149
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000150 for_each_memblock(memory, reg) {
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700151 tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
152 tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000153 if (tstart >= tend)
154 continue;
155 ret = (*func)(tstart, tend - tstart, arg);
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700156 if (ret)
157 break;
Badari Pulavarty9d88a2e2008-04-18 13:33:53 -0700158 }
159 return ret;
Badari Pulavartya99824f2008-02-05 00:10:18 -0800160}
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700161EXPORT_SYMBOL_GPL(walk_system_ram_range);
Badari Pulavartya99824f2008-02-05 00:10:18 -0800162
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000163/*
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000164 * Initialize the bootmem system and give it all the memory we
165 * have available. If we are using highmem, we only put the
166 * lowmem into the bootmem system.
167 */
168#ifndef CONFIG_NEED_MULTIPLE_NODES
169void __init do_init_bootmem(void)
170{
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000171 unsigned long start, bootmap_pages;
172 unsigned long total_pages;
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000173 struct memblock_region *reg;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000174 int boot_mapsize;
175
Yinghai Lu95f72d12010-07-12 14:36:09 +1000176 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
177 total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000178#ifdef CONFIG_HIGHMEM
179 total_pages = total_lowmem >> PAGE_SHIFT;
Kumar Galad7917ba2008-04-16 05:52:22 +1000180 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000181#endif
182
183 /*
184 * Find an area to use for the bootmem bitmap. Calculate the size of
185 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
186 * Add 1 additional page in case the address isn't page-aligned.
187 */
188 bootmap_pages = bootmem_bootmap_pages(total_pages);
189
Yinghai Lu95f72d12010-07-12 14:36:09 +1000190 start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000191
Kumar Gala37dd2ba2008-04-22 04:22:34 +1000192 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
193 boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000194
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700195 /* Add active regions with valid PFNs */
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000196 for_each_memblock(memory, reg) {
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700197 unsigned long start_pfn, end_pfn;
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700198 start_pfn = memblock_region_memory_base_pfn(reg);
199 end_pfn = memblock_region_memory_end_pfn(reg);
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700200 add_active_range(0, start_pfn, end_pfn);
201 }
202
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000203 /* Add all physical memory to the bootmem map, mark each area
204 * present.
205 */
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000206#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000207 free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600208
209 /* reserve the sections we're already using */
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000210 for_each_memblock(reserved, reg) {
211 unsigned long top = reg->base + reg->size - 1;
212 if (top < lowmem_end_addr)
213 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
214 else if (reg->base < lowmem_end_addr) {
215 unsigned long trunc_size = lowmem_end_addr - reg->base;
216 reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600217 }
218 }
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700219#else
220 free_bootmem_with_active_regions(0, max_pfn);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000221
222 /* reserve the sections we're already using */
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000223 for_each_memblock(reserved, reg)
224 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
Kumar Galaf98eeb42008-01-09 11:27:23 -0600225#endif
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000226 /* XXX need to clip this if using highmem? */
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700227 sparse_memory_present_with_active_regions(0);
228
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000229 init_bootmem_done = 1;
230}
231
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000232/* mark pages that don't exist as nosave */
233static int __init mark_nonram_nosave(void)
234{
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000235 struct memblock_region *reg, *prev = NULL;
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000236
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000237 for_each_memblock(memory, reg) {
238 if (prev &&
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700239 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
240 register_nosave_region(memblock_region_memory_end_pfn(prev),
241 memblock_region_memory_base_pfn(reg));
Benjamin Herrenschmidt28be7072010-08-04 13:43:53 +1000242 prev = reg;
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000243 }
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000244 return 0;
245}
246
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000247/*
248 * paging_init() sets up the page tables - in fact we've already done this.
249 */
250void __init paging_init(void)
251{
Yinghai Lu95f72d12010-07-12 14:36:09 +1000252 unsigned long total_ram = memblock_phys_mem_size();
253 phys_addr_t top_of_ram = memblock_end_of_DRAM();
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700254 unsigned long max_zone_pfns[MAX_NR_ZONES];
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000255
Kumar Gala2c419bd2008-04-23 23:05:20 +1000256#ifdef CONFIG_PPC32
257 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
258 unsigned long end = __fix_to_virt(FIX_HOLE);
259
260 for (; v < end; v += PAGE_SIZE)
261 map_page(v, 0, 0); /* XXX gross */
262#endif
263
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000264#ifdef CONFIG_HIGHMEM
265 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
Kumar Gala2c419bd2008-04-23 23:05:20 +1000266 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
267
268 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000269 kmap_prot = PAGE_KERNEL;
270#endif /* CONFIG_HIGHMEM */
271
Stefan Roese2bf30162008-07-10 01:09:23 +1000272 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n",
Tony Breedsfb610632008-07-31 13:51:42 +1000273 (unsigned long long)top_of_ram, total_ram);
Olof Johanssone110b282006-04-12 15:25:01 -0500274 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
Stefan Roese2bf30162008-07-10 01:09:23 +1000275 (long int)((top_of_ram - total_ram) >> 20));
Mel Gorman6391af12006-10-11 01:20:39 -0700276 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000277#ifdef CONFIG_HIGHMEM
Kumar Galad7917ba2008-04-16 05:52:22 +1000278 max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT;
Mel Gorman6391af12006-10-11 01:20:39 -0700279 max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000280#else
Mel Gorman6391af12006-10-11 01:20:39 -0700281 max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
Mel Gormanc67c3cb2006-09-27 01:49:49 -0700282#endif
283 free_area_init_nodes(max_zone_pfns);
Johannes Berg4e8ad3e2007-05-08 19:25:00 +1000284
285 mark_nonram_nosave();
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000286}
287#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
288
289void __init mem_init(void)
290{
291#ifdef CONFIG_NEED_MULTIPLE_NODES
292 int nid;
293#endif
294 pg_data_t *pgdat;
295 unsigned long i;
296 struct page *page;
297 unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
298
FUJITA Tomonoria9327292010-03-16 13:16:25 +0000299#ifdef CONFIG_SWIOTLB
300 if (ppc_swiotlb_enable)
301 swiotlb_init(1);
302#endif
303
Benjamin Herrenschmidt4734b592010-07-28 14:31:29 +1000304 num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000305 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
306
307#ifdef CONFIG_NEED_MULTIPLE_NODES
308 for_each_online_node(nid) {
309 if (NODE_DATA(nid)->node_spanned_pages != 0) {
Anton Blanchardc258dd42006-03-25 17:27:09 +1100310 printk("freeing bootmem node %d\n", nid);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000311 totalram_pages +=
312 free_all_bootmem_node(NODE_DATA(nid));
313 }
314 }
315#else
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100316 max_mapnr = max_pfn;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000317 totalram_pages += free_all_bootmem();
318#endif
KAMEZAWA Hiroyukiec936fc2006-03-27 01:15:59 -0800319 for_each_online_pgdat(pgdat) {
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000320 for (i = 0; i < pgdat->node_spanned_pages; i++) {
Paul Mackerrasfb6d73d2005-11-16 11:43:26 +1100321 if (!pfn_valid(pgdat->node_start_pfn + i))
322 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000323 page = pgdat_page_nr(pgdat, i);
324 if (PageReserved(page))
325 reservedpages++;
326 }
327 }
328
329 codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
Anton Blanchardbcb35572005-11-07 17:43:07 +1100330 datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000331 initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
332 bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
333
334#ifdef CONFIG_HIGHMEM
335 {
336 unsigned long pfn, highmem_mapnr;
337
Kumar Galad7917ba2008-04-16 05:52:22 +1000338 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000339 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
340 struct page *page = pfn_to_page(pfn);
Yinghai Lu95f72d12010-07-12 14:36:09 +1000341 if (memblock_is_reserved(pfn << PAGE_SHIFT))
Kumar Galaf98eeb42008-01-09 11:27:23 -0600342 continue;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000343 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800344 init_page_count(page);
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000345 __free_page(page);
346 totalhigh_pages++;
Kumar Galaf98eeb42008-01-09 11:27:23 -0600347 reservedpages--;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000348 }
349 totalram_pages += totalhigh_pages;
Olof Johanssone110b282006-04-12 15:25:01 -0500350 printk(KERN_DEBUG "High memory: %luk\n",
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000351 totalhigh_pages << (PAGE_SHIFT-10));
352 }
353#endif /* CONFIG_HIGHMEM */
354
355 printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
356 "%luk reserved, %luk data, %luk bss, %luk init)\n",
Geert Uytterhoevencc013a82009-09-21 17:02:36 -0700357 nr_free_pages() << (PAGE_SHIFT-10),
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000358 num_physpages << (PAGE_SHIFT-10),
359 codesize >> 10,
360 reservedpages << (PAGE_SHIFT-10),
361 datasize >> 10,
362 bsssize >> 10,
363 initsize >> 10);
364
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000365#ifdef CONFIG_PPC32
366 pr_info("Kernel virtual memory layout:\n");
367 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
368#ifdef CONFIG_HIGHMEM
369 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
370 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
371#endif /* CONFIG_HIGHMEM */
Benjamin Herrenschmidt8b31e492009-05-27 13:50:33 +1000372#ifdef CONFIG_NOT_COHERENT_CACHE
373 pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
374 IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
375#endif /* CONFIG_NOT_COHERENT_CACHE */
Benjamin Herrenschmidtf637a492009-05-27 13:44:50 +1000376 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
377 ioremap_bot, IOREMAP_TOP);
378 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
379 VMALLOC_START, VMALLOC_END);
380#endif /* CONFIG_PPC32 */
381
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000382 mem_init_done = 1;
Paul Mackerras7c8c6b92005-10-06 12:23:33 +1000383}
384
385/*
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000386 * This is called when a page has been modified by the kernel.
387 * It just marks the page as not i-cache clean. We do the i-cache
388 * flush later when the page is given to a user process, if necessary.
389 */
390void flush_dcache_page(struct page *page)
391{
392 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
393 return;
394 /* avoid an atomic op if possible */
395 if (test_bit(PG_arch_1, &page->flags))
396 clear_bit(PG_arch_1, &page->flags);
397}
398EXPORT_SYMBOL(flush_dcache_page);
399
400void flush_dcache_icache_page(struct page *page)
401{
David Gibson0895ecd2009-10-26 19:24:31 +0000402#ifdef CONFIG_HUGETLB_PAGE
403 if (PageCompound(page)) {
404 flush_dcache_icache_hugepage(page);
405 return;
406 }
407#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000408#ifdef CONFIG_BOOKE
David Gibson0895ecd2009-10-26 19:24:31 +0000409 {
410 void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
411 __flush_dcache_icache(start);
412 kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
413 }
Paul Mackerrasab1f9da2005-10-10 21:58:35 +1000414#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000415 /* On 8xx there is no need to kmap since highmem is not supported */
416 __flush_dcache_icache(page_address(page));
417#else
418 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
419#endif
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000420}
David Gibson0895ecd2009-10-26 19:24:31 +0000421
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000422void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
423{
424 clear_page(page);
425
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000426 /*
427 * We shouldnt have to do this, but some versions of glibc
428 * require it (ld.so assumes zero filled pages are icache clean)
429 * - Anton
430 */
David Gibson09f5dc42006-02-06 13:24:53 +1100431 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000432}
433EXPORT_SYMBOL(clear_user_page);
434
435void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
436 struct page *pg)
437{
438 copy_page(vto, vfrom);
439
440 /*
441 * We should be able to use the following optimisation, however
442 * there are two problems.
443 * Firstly a bug in some versions of binutils meant PLT sections
444 * were not marked executable.
445 * Secondly the first word in the GOT section is blrl, used
446 * to establish the GOT address. Until recently the GOT was
447 * not marked executable.
448 * - Anton
449 */
450#if 0
451 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
452 return;
453#endif
454
David Gibson09f5dc42006-02-06 13:24:53 +1100455 flush_dcache_page(pg);
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000456}
457
458void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
459 unsigned long addr, int len)
460{
461 unsigned long maddr;
462
463 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
464 flush_icache_range(maddr, maddr + len);
465 kunmap(page);
466}
467EXPORT_SYMBOL(flush_icache_user_range);
468
469/*
470 * This is called at the end of handling a user page fault, when the
471 * fault has been handled by updating a PTE in the linux page tables.
472 * We use it to preload an HPTE into the hash table corresponding to
473 * the updated linux PTE.
474 *
Hugh Dickins01edcd82005-11-23 13:37:39 -0800475 * This must always be called with the pte lock held.
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000476 */
477void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
Russell King4b3073e2009-12-18 16:40:18 +0000478 pte_t *ptep)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000479{
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100480#ifdef CONFIG_PPC_STD_MMU
481 unsigned long access = 0, trap;
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000482
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000483 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
Russell King4b3073e2009-12-18 16:40:18 +0000484 if (!pte_young(*ptep) || address >= TASK_SIZE)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000485 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100486
487 /* We try to figure out if we are coming from an instruction
488 * access fault and pass that down to __hash_page so we avoid
489 * double-faulting on execution of fresh text. We have to test
490 * for regs NULL since init will get here first thing at boot
491 *
492 * We also avoid filling the hash if not coming from a fault
493 */
494 if (current->thread.regs == NULL)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000495 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100496 trap = TRAP(current->thread.regs);
497 if (trap == 0x400)
498 access |= _PAGE_EXEC;
499 else if (trap != 0x300)
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000500 return;
Benjamin Herrenschmidt3c726f82005-11-07 11:06:55 +1100501 hash_preload(vma->vm_mm, address, access, trap);
502#endif /* CONFIG_PPC_STD_MMU */
Paul Mackerras14cf11a2005-09-26 16:04:21 +1000503}