Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 1 | /* |
| 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 8 | * 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 20 | #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 Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 33 | #include <linux/suspend.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 34 | |
| 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 45 | #include <asm/lmb.h> |
| 46 | #include <asm/sections.h> |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 47 | #include <asm/vdso.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 48 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 49 | #include "mmu_decl.h" |
| 50 | |
| 51 | #ifndef CPU_FTR_COHERENT_ICACHE |
| 52 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ |
| 53 | #define CPU_FTR_NOEXECUTE 0 |
| 54 | #endif |
| 55 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 56 | int init_bootmem_done; |
| 57 | int mem_init_done; |
Paul Mackerras | cf00a8d | 2005-10-31 13:07:02 +1100 | [diff] [blame] | 58 | unsigned long memory_limit; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 59 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 60 | int page_is_ram(unsigned long pfn) |
| 61 | { |
| 62 | unsigned long paddr = (pfn << PAGE_SHIFT); |
| 63 | |
| 64 | #ifndef CONFIG_PPC64 /* XXX for now */ |
| 65 | return paddr < __pa(high_memory); |
| 66 | #else |
| 67 | int i; |
| 68 | for (i=0; i < lmb.memory.cnt; i++) { |
| 69 | unsigned long base; |
| 70 | |
| 71 | base = lmb.memory.region[i].base; |
| 72 | |
| 73 | if ((paddr >= base) && |
| 74 | (paddr < (base + lmb.memory.region[i].size))) { |
| 75 | return 1; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | return 0; |
| 80 | #endif |
| 81 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 82 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 83 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 84 | unsigned long size, pgprot_t vma_prot) |
| 85 | { |
| 86 | if (ppc_md.phys_mem_access_prot) |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 87 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 88 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 89 | if (!page_is_ram(pfn)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 90 | vma_prot = __pgprot(pgprot_val(vma_prot) |
| 91 | | _PAGE_GUARDED | _PAGE_NO_CACHE); |
| 92 | return vma_prot; |
| 93 | } |
| 94 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 95 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 96 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 97 | |
| 98 | void online_page(struct page *page) |
| 99 | { |
| 100 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 101 | init_page_count(page); |
Nick Piggin | 70dc991 | 2006-03-22 00:08:35 -0800 | [diff] [blame] | 102 | __free_page(page); |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 103 | totalram_pages++; |
| 104 | num_physpages++; |
| 105 | } |
| 106 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 107 | #ifdef CONFIG_NUMA |
| 108 | int memory_add_physaddr_to_nid(u64 start) |
| 109 | { |
| 110 | return hot_add_scn_to_nid(start); |
| 111 | } |
| 112 | #endif |
| 113 | |
| 114 | int __devinit arch_add_memory(int nid, u64 start, u64 size) |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 115 | { |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 116 | struct pglist_data *pgdata; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 117 | struct zone *zone; |
| 118 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 119 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 120 | |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 121 | pgdata = NODE_DATA(nid); |
| 122 | |
Andrew Morton | 2d0eee1 | 2006-03-21 23:00:05 -0800 | [diff] [blame] | 123 | start = (unsigned long)__va(start); |
Mike Kravetz | 54b7924 | 2005-11-07 16:25:48 -0800 | [diff] [blame] | 124 | create_section_mapping(start, start + size); |
| 125 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 126 | /* this should work for most non-highmem platforms */ |
| 127 | zone = pgdata->node_zones; |
| 128 | |
| 129 | return __add_pages(zone, start_pfn, nr_pages); |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 130 | } |
| 131 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 132 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
| 133 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 134 | void show_mem(void) |
| 135 | { |
| 136 | unsigned long total = 0, reserved = 0; |
| 137 | unsigned long shared = 0, cached = 0; |
| 138 | unsigned long highmem = 0; |
| 139 | struct page *page; |
| 140 | pg_data_t *pgdat; |
| 141 | unsigned long i; |
| 142 | |
| 143 | printk("Mem-info:\n"); |
| 144 | show_free_areas(); |
| 145 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 146 | for_each_online_pgdat(pgdat) { |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 147 | unsigned long flags; |
| 148 | pgdat_resize_lock(pgdat, &flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 149 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 150 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 151 | continue; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 152 | page = pgdat_page_nr(pgdat, i); |
| 153 | total++; |
| 154 | if (PageHighMem(page)) |
| 155 | highmem++; |
| 156 | if (PageReserved(page)) |
| 157 | reserved++; |
| 158 | else if (PageSwapCache(page)) |
| 159 | cached++; |
| 160 | else if (page_count(page)) |
| 161 | shared += page_count(page) - 1; |
| 162 | } |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 163 | pgdat_resize_unlock(pgdat, &flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 164 | } |
| 165 | printk("%ld pages of RAM\n", total); |
| 166 | #ifdef CONFIG_HIGHMEM |
| 167 | printk("%ld pages of HIGHMEM\n", highmem); |
| 168 | #endif |
| 169 | printk("%ld reserved pages\n", reserved); |
| 170 | printk("%ld pages shared\n", shared); |
| 171 | printk("%ld pages swap cached\n", cached); |
| 172 | } |
| 173 | |
| 174 | /* |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 175 | * Initialize the bootmem system and give it all the memory we |
| 176 | * have available. If we are using highmem, we only put the |
| 177 | * lowmem into the bootmem system. |
| 178 | */ |
| 179 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
| 180 | void __init do_init_bootmem(void) |
| 181 | { |
| 182 | unsigned long i; |
| 183 | unsigned long start, bootmap_pages; |
| 184 | unsigned long total_pages; |
| 185 | int boot_mapsize; |
| 186 | |
| 187 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; |
| 188 | #ifdef CONFIG_HIGHMEM |
| 189 | total_pages = total_lowmem >> PAGE_SHIFT; |
| 190 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 200 | |
| 201 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); |
| 202 | |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 203 | /* 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 211 | /* Add all physical memory to the bootmem map, mark each area |
| 212 | * present. |
| 213 | */ |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 214 | #ifdef CONFIG_HIGHMEM |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 215 | free_bootmem_with_active_regions(0, total_lowmem >> PAGE_SHIFT); |
| 216 | #else |
| 217 | free_bootmem_with_active_regions(0, max_pfn); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 218 | #endif |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 219 | |
| 220 | /* reserve the sections we're already using */ |
| 221 | for (i = 0; i < lmb.reserved.cnt; i++) |
| 222 | reserve_bootmem(lmb.reserved.region[i].base, |
| 223 | lmb_size_bytes(&lmb.reserved, i)); |
| 224 | |
| 225 | /* XXX need to clip this if using highmem? */ |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 226 | sparse_memory_present_with_active_regions(0); |
| 227 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 228 | init_bootmem_done = 1; |
| 229 | } |
| 230 | |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 231 | /* mark pages that don't exist as nosave */ |
| 232 | static int __init mark_nonram_nosave(void) |
| 233 | { |
| 234 | unsigned long lmb_next_region_start_pfn, |
| 235 | lmb_region_max_pfn; |
| 236 | int i; |
| 237 | |
| 238 | for (i = 0; i < lmb.memory.cnt - 1; i++) { |
| 239 | lmb_region_max_pfn = |
| 240 | (lmb.memory.region[i].base >> PAGE_SHIFT) + |
| 241 | (lmb.memory.region[i].size >> PAGE_SHIFT); |
| 242 | lmb_next_region_start_pfn = |
| 243 | lmb.memory.region[i+1].base >> PAGE_SHIFT; |
| 244 | |
| 245 | if (lmb_region_max_pfn < lmb_next_region_start_pfn) |
| 246 | register_nosave_region(lmb_region_max_pfn, |
| 247 | lmb_next_region_start_pfn); |
| 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 253 | /* |
| 254 | * paging_init() sets up the page tables - in fact we've already done this. |
| 255 | */ |
| 256 | void __init paging_init(void) |
| 257 | { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 258 | unsigned long total_ram = lmb_phys_mem_size(); |
| 259 | unsigned long top_of_ram = lmb_end_of_DRAM(); |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 260 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 261 | |
| 262 | #ifdef CONFIG_HIGHMEM |
| 263 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
Benjamin Herrenschmidt | 5453e77 | 2007-05-22 16:25:51 +1000 | [diff] [blame] | 264 | pkmap_page_table = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
| 265 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 266 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ |
Benjamin Herrenschmidt | 5453e77 | 2007-05-22 16:25:51 +1000 | [diff] [blame] | 267 | kmap_pte = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k |
| 268 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), |
| 269 | KMAP_FIX_BEGIN); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 270 | kmap_prot = PAGE_KERNEL; |
| 271 | #endif /* CONFIG_HIGHMEM */ |
| 272 | |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 273 | printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 274 | top_of_ram, total_ram); |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 275 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 276 | (top_of_ram - total_ram) >> 20); |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 277 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 278 | #ifdef CONFIG_HIGHMEM |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 279 | max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; |
| 280 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 281 | #else |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 282 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 283 | #endif |
| 284 | free_area_init_nodes(max_zone_pfns); |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 285 | |
| 286 | mark_nonram_nosave(); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 287 | } |
| 288 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ |
| 289 | |
| 290 | void __init mem_init(void) |
| 291 | { |
| 292 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 293 | int nid; |
| 294 | #endif |
| 295 | pg_data_t *pgdat; |
| 296 | unsigned long i; |
| 297 | struct page *page; |
| 298 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; |
| 299 | |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 300 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 301 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); |
| 302 | |
| 303 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 304 | for_each_online_node(nid) { |
| 305 | if (NODE_DATA(nid)->node_spanned_pages != 0) { |
Anton Blanchard | c258dd4 | 2006-03-25 17:27:09 +1100 | [diff] [blame] | 306 | printk("freeing bootmem node %d\n", nid); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 307 | totalram_pages += |
| 308 | free_all_bootmem_node(NODE_DATA(nid)); |
| 309 | } |
| 310 | } |
| 311 | #else |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 312 | max_mapnr = max_pfn; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 313 | totalram_pages += free_all_bootmem(); |
| 314 | #endif |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 315 | for_each_online_pgdat(pgdat) { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 316 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 317 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 318 | continue; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 319 | page = pgdat_page_nr(pgdat, i); |
| 320 | if (PageReserved(page)) |
| 321 | reservedpages++; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; |
Anton Blanchard | bcb3557 | 2005-11-07 17:43:07 +1100 | [diff] [blame] | 326 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 327 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; |
| 328 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; |
| 329 | |
| 330 | #ifdef CONFIG_HIGHMEM |
| 331 | { |
| 332 | unsigned long pfn, highmem_mapnr; |
| 333 | |
| 334 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; |
| 335 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| 336 | struct page *page = pfn_to_page(pfn); |
| 337 | |
| 338 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 339 | init_page_count(page); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 340 | __free_page(page); |
| 341 | totalhigh_pages++; |
| 342 | } |
| 343 | totalram_pages += totalhigh_pages; |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 344 | printk(KERN_DEBUG "High memory: %luk\n", |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 345 | totalhigh_pages << (PAGE_SHIFT-10)); |
| 346 | } |
| 347 | #endif /* CONFIG_HIGHMEM */ |
| 348 | |
| 349 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " |
| 350 | "%luk reserved, %luk data, %luk bss, %luk init)\n", |
| 351 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), |
| 352 | num_physpages << (PAGE_SHIFT-10), |
| 353 | codesize >> 10, |
| 354 | reservedpages << (PAGE_SHIFT-10), |
| 355 | datasize >> 10, |
| 356 | bsssize >> 10, |
| 357 | initsize >> 10); |
| 358 | |
| 359 | mem_init_done = 1; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 363 | * This is called when a page has been modified by the kernel. |
| 364 | * It just marks the page as not i-cache clean. We do the i-cache |
| 365 | * flush later when the page is given to a user process, if necessary. |
| 366 | */ |
| 367 | void flush_dcache_page(struct page *page) |
| 368 | { |
| 369 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 370 | return; |
| 371 | /* avoid an atomic op if possible */ |
| 372 | if (test_bit(PG_arch_1, &page->flags)) |
| 373 | clear_bit(PG_arch_1, &page->flags); |
| 374 | } |
| 375 | EXPORT_SYMBOL(flush_dcache_page); |
| 376 | |
| 377 | void flush_dcache_icache_page(struct page *page) |
| 378 | { |
| 379 | #ifdef CONFIG_BOOKE |
| 380 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); |
| 381 | __flush_dcache_icache(start); |
| 382 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 383 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 384 | /* On 8xx there is no need to kmap since highmem is not supported */ |
| 385 | __flush_dcache_icache(page_address(page)); |
| 386 | #else |
| 387 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); |
| 388 | #endif |
| 389 | |
| 390 | } |
| 391 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| 392 | { |
| 393 | clear_page(page); |
| 394 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 395 | /* |
| 396 | * We shouldnt have to do this, but some versions of glibc |
| 397 | * require it (ld.so assumes zero filled pages are icache clean) |
| 398 | * - Anton |
| 399 | */ |
David Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 400 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 401 | } |
| 402 | EXPORT_SYMBOL(clear_user_page); |
| 403 | |
| 404 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
| 405 | struct page *pg) |
| 406 | { |
| 407 | copy_page(vto, vfrom); |
| 408 | |
| 409 | /* |
| 410 | * We should be able to use the following optimisation, however |
| 411 | * there are two problems. |
| 412 | * Firstly a bug in some versions of binutils meant PLT sections |
| 413 | * were not marked executable. |
| 414 | * Secondly the first word in the GOT section is blrl, used |
| 415 | * to establish the GOT address. Until recently the GOT was |
| 416 | * not marked executable. |
| 417 | * - Anton |
| 418 | */ |
| 419 | #if 0 |
| 420 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) |
| 421 | return; |
| 422 | #endif |
| 423 | |
David Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 424 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| 428 | unsigned long addr, int len) |
| 429 | { |
| 430 | unsigned long maddr; |
| 431 | |
| 432 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); |
| 433 | flush_icache_range(maddr, maddr + len); |
| 434 | kunmap(page); |
| 435 | } |
| 436 | EXPORT_SYMBOL(flush_icache_user_range); |
| 437 | |
| 438 | /* |
| 439 | * This is called at the end of handling a user page fault, when the |
| 440 | * fault has been handled by updating a PTE in the linux page tables. |
| 441 | * We use it to preload an HPTE into the hash table corresponding to |
| 442 | * the updated linux PTE. |
| 443 | * |
Hugh Dickins | 01edcd8 | 2005-11-23 13:37:39 -0800 | [diff] [blame] | 444 | * This must always be called with the pte lock held. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 445 | */ |
| 446 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
| 447 | pte_t pte) |
| 448 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 449 | #ifdef CONFIG_PPC_STD_MMU |
| 450 | unsigned long access = 0, trap; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 451 | #endif |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 452 | unsigned long pfn = pte_pfn(pte); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 453 | |
| 454 | /* handle i-cache coherency */ |
| 455 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && |
| 456 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && |
| 457 | pfn_valid(pfn)) { |
| 458 | struct page *page = pfn_to_page(pfn); |
Vitaly Bordug | dbbb06b | 2007-01-24 22:40:57 +0300 | [diff] [blame] | 459 | #ifdef CONFIG_8xx |
| 460 | /* On 8xx, cache control instructions (particularly |
| 461 | * "dcbst" from flush_dcache_icache) fault as write |
| 462 | * operation if there is an unpopulated TLB entry |
| 463 | * for the address in question. To workaround that, |
| 464 | * we invalidate the TLB here, thus avoiding dcbst |
| 465 | * misbehaviour. |
| 466 | */ |
Benjamin Herrenschmidt | 0b47759 | 2007-11-20 18:32:12 +1100 | [diff] [blame^] | 467 | _tlbie(address, 0 /* 8xx doesn't care about PID */); |
Vitaly Bordug | dbbb06b | 2007-01-24 22:40:57 +0300 | [diff] [blame] | 468 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 469 | if (!PageReserved(page) |
| 470 | && !test_bit(PG_arch_1, &page->flags)) { |
| 471 | if (vma->vm_mm == current->active_mm) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 472 | __flush_dcache_icache((void *) address); |
| 473 | } else |
| 474 | flush_dcache_icache_page(page); |
| 475 | set_bit(PG_arch_1, &page->flags); |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | #ifdef CONFIG_PPC_STD_MMU |
| 480 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
| 481 | if (!pte_young(pte) || address >= TASK_SIZE) |
| 482 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 483 | |
| 484 | /* We try to figure out if we are coming from an instruction |
| 485 | * access fault and pass that down to __hash_page so we avoid |
| 486 | * double-faulting on execution of fresh text. We have to test |
| 487 | * for regs NULL since init will get here first thing at boot |
| 488 | * |
| 489 | * We also avoid filling the hash if not coming from a fault |
| 490 | */ |
| 491 | if (current->thread.regs == NULL) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 492 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 493 | trap = TRAP(current->thread.regs); |
| 494 | if (trap == 0x400) |
| 495 | access |= _PAGE_EXEC; |
| 496 | else if (trap != 0x300) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 497 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 498 | hash_preload(vma->vm_mm, address, access, trap); |
| 499 | #endif /* CONFIG_PPC_STD_MMU */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 500 | } |