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> |
David S. Miller | d9b2b2a | 2008-02-13 16:56:49 -0800 | [diff] [blame] | 34 | #include <linux/lmb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 35 | |
| 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 46 | #include <asm/sections.h> |
Tony Breeds | db7f37d | 2008-07-01 11:30:06 +1000 | [diff] [blame] | 47 | #include <asm/sparsemem.h> |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 48 | #include <asm/vdso.h> |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 49 | #include <asm/fixmap.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 51 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 58 | int init_bootmem_done; |
| 59 | int mem_init_done; |
Becky Bruce | 49a8496 | 2009-05-08 12:19:27 +0000 | [diff] [blame] | 60 | phys_addr_t memory_limit; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 61 | |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 62 | #ifdef CONFIG_HIGHMEM |
| 63 | pte_t *kmap_pte; |
| 64 | pgprot_t kmap_prot; |
| 65 | |
| 66 | EXPORT_SYMBOL(kmap_prot); |
| 67 | EXPORT_SYMBOL(kmap_pte); |
| 68 | |
| 69 | static 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 76 | int page_is_ram(unsigned long pfn) |
| 77 | { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 78 | #ifndef CONFIG_PPC64 /* XXX for now */ |
Roland Dreier | a880e76 | 2008-09-15 10:43:35 +0000 | [diff] [blame] | 79 | return pfn < max_pfn; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 80 | #else |
Roland Dreier | a880e76 | 2008-09-15 10:43:35 +0000 | [diff] [blame] | 81 | unsigned long paddr = (pfn << PAGE_SHIFT); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 82 | 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 97 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 98 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | unsigned long size, pgprot_t vma_prot) |
| 100 | { |
| 101 | if (ppc_md.phys_mem_access_prot) |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 102 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 103 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 104 | if (!page_is_ram(pfn)) |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 105 | vma_prot = pgprot_noncached(vma_prot); |
| 106 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 107 | return vma_prot; |
| 108 | } |
| 109 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 110 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 111 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 112 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 113 | #ifdef CONFIG_NUMA |
| 114 | int memory_add_physaddr_to_nid(u64 start) |
| 115 | { |
| 116 | return hot_add_scn_to_nid(start); |
| 117 | } |
| 118 | #endif |
| 119 | |
Geert Uytterhoeven | fa90f70 | 2008-03-29 03:10:50 +1100 | [diff] [blame] | 120 | int arch_add_memory(int nid, u64 start, u64 size) |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 121 | { |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 122 | struct pglist_data *pgdata; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 123 | struct zone *zone; |
| 124 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 125 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 126 | |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 127 | pgdata = NODE_DATA(nid); |
| 128 | |
Andrew Morton | 2d0eee1 | 2006-03-21 23:00:05 -0800 | [diff] [blame] | 129 | start = (unsigned long)__va(start); |
Mike Kravetz | 54b7924 | 2005-11-07 16:25:48 -0800 | [diff] [blame] | 130 | create_section_mapping(start, start + size); |
| 131 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 132 | /* this should work for most non-highmem platforms */ |
| 133 | zone = pgdata->node_zones; |
| 134 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 135 | return __add_pages(nid, zone, start_pfn, nr_pages); |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 136 | } |
Nathan Lynch | 0d57994 | 2008-06-04 08:30:54 +1000 | [diff] [blame] | 137 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 138 | |
| 139 | /* |
| 140 | * walk_memory_resource() needs to make sure there is no holes in a given |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 141 | * 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 Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 144 | */ |
| 145 | int |
| 146 | walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg, |
| 147 | int (*func)(unsigned long, unsigned long, void *)) |
| 148 | { |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 149 | 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 Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 168 | } |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 169 | EXPORT_SYMBOL_GPL(walk_memory_resource); |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 170 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 171 | /* |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 172 | * 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 |
| 177 | void __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 Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 184 | max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 185 | total_pages = (lmb_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 186 | #ifdef CONFIG_HIGHMEM |
| 187 | total_pages = total_lowmem >> PAGE_SHIFT; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 188 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 189 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 199 | |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 200 | 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 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 |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 215 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 216 | |
| 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 Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 221 | if (addr < lowmem_end_addr) |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 222 | reserve_bootmem(lmb.reserved.region[i].base, |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 223 | lmb_size_bytes(&lmb.reserved, i), |
| 224 | BOOTMEM_DEFAULT); |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 225 | else if (lmb.reserved.region[i].base < lowmem_end_addr) { |
| 226 | unsigned long adjusted_size = lowmem_end_addr - |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 227 | lmb.reserved.region[i].base; |
| 228 | reserve_bootmem(lmb.reserved.region[i].base, |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 229 | adjusted_size, BOOTMEM_DEFAULT); |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 230 | } |
| 231 | } |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 232 | #else |
| 233 | free_bootmem_with_active_regions(0, max_pfn); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 234 | |
| 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 Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 238 | lmb_size_bytes(&lmb.reserved, i), |
| 239 | BOOTMEM_DEFAULT); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 240 | |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 241 | #endif |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 242 | /* XXX need to clip this if using highmem? */ |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 243 | sparse_memory_present_with_active_regions(0); |
| 244 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 245 | init_bootmem_done = 1; |
| 246 | } |
| 247 | |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 248 | /* mark pages that don't exist as nosave */ |
| 249 | static 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 270 | /* |
| 271 | * paging_init() sets up the page tables - in fact we've already done this. |
| 272 | */ |
| 273 | void __init paging_init(void) |
| 274 | { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 275 | unsigned long total_ram = lmb_phys_mem_size(); |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 276 | phys_addr_t top_of_ram = lmb_end_of_DRAM(); |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 277 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 278 | |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 279 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 287 | #ifdef CONFIG_HIGHMEM |
| 288 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 289 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
| 290 | |
| 291 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 292 | kmap_prot = PAGE_KERNEL; |
| 293 | #endif /* CONFIG_HIGHMEM */ |
| 294 | |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 295 | printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%lx\n", |
Tony Breeds | fb61063 | 2008-07-31 13:51:42 +1000 | [diff] [blame] | 296 | (unsigned long long)top_of_ram, total_ram); |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 297 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 298 | (long int)((top_of_ram - total_ram) >> 20)); |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 299 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 300 | #ifdef CONFIG_HIGHMEM |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 301 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 302 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 303 | #else |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 304 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 305 | #endif |
| 306 | free_area_init_nodes(max_zone_pfns); |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 307 | |
| 308 | mark_nonram_nosave(); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 309 | } |
| 310 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ |
| 311 | |
| 312 | void __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 Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 322 | num_physpages = lmb.memory.size >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 323 | 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 Blanchard | c258dd4 | 2006-03-25 17:27:09 +1100 | [diff] [blame] | 328 | printk("freeing bootmem node %d\n", nid); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 329 | totalram_pages += |
| 330 | free_all_bootmem_node(NODE_DATA(nid)); |
| 331 | } |
| 332 | } |
| 333 | #else |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 334 | max_mapnr = max_pfn; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 335 | totalram_pages += free_all_bootmem(); |
| 336 | #endif |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 337 | for_each_online_pgdat(pgdat) { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 338 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 339 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 340 | continue; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 341 | page = pgdat_page_nr(pgdat, i); |
| 342 | if (PageReserved(page)) |
| 343 | reservedpages++; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; |
Anton Blanchard | bcb3557 | 2005-11-07 17:43:07 +1100 | [diff] [blame] | 348 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 349 | 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 Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 356 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 357 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| 358 | struct page *page = pfn_to_page(pfn); |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 359 | if (lmb_is_reserved(pfn << PAGE_SHIFT)) |
| 360 | continue; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 361 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 362 | init_page_count(page); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 363 | __free_page(page); |
| 364 | totalhigh_pages++; |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 365 | reservedpages--; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 366 | } |
| 367 | totalram_pages += totalhigh_pages; |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 368 | printk(KERN_DEBUG "High memory: %luk\n", |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 369 | 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", |
Geert Uytterhoeven | cc013a8 | 2009-09-21 17:02:36 -0700 | [diff] [blame^] | 375 | nr_free_pages() << (PAGE_SHIFT-10), |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 376 | num_physpages << (PAGE_SHIFT-10), |
| 377 | codesize >> 10, |
| 378 | reservedpages << (PAGE_SHIFT-10), |
| 379 | datasize >> 10, |
| 380 | bsssize >> 10, |
| 381 | initsize >> 10); |
| 382 | |
Benjamin Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 383 | #ifdef CONFIG_PPC32 |
| 384 | pr_info("Kernel virtual memory layout:\n"); |
| 385 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); |
| 386 | #ifdef CONFIG_HIGHMEM |
| 387 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", |
| 388 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); |
| 389 | #endif /* CONFIG_HIGHMEM */ |
Benjamin Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 390 | #ifdef CONFIG_NOT_COHERENT_CACHE |
| 391 | pr_info(" * 0x%08lx..0x%08lx : consistent mem\n", |
| 392 | IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE); |
| 393 | #endif /* CONFIG_NOT_COHERENT_CACHE */ |
Benjamin Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 394 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
| 395 | ioremap_bot, IOREMAP_TOP); |
| 396 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", |
| 397 | VMALLOC_START, VMALLOC_END); |
| 398 | #endif /* CONFIG_PPC32 */ |
| 399 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 400 | mem_init_done = 1; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 404 | * This is called when a page has been modified by the kernel. |
| 405 | * It just marks the page as not i-cache clean. We do the i-cache |
| 406 | * flush later when the page is given to a user process, if necessary. |
| 407 | */ |
| 408 | void flush_dcache_page(struct page *page) |
| 409 | { |
| 410 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) |
| 411 | return; |
| 412 | /* avoid an atomic op if possible */ |
| 413 | if (test_bit(PG_arch_1, &page->flags)) |
| 414 | clear_bit(PG_arch_1, &page->flags); |
| 415 | } |
| 416 | EXPORT_SYMBOL(flush_dcache_page); |
| 417 | |
| 418 | void flush_dcache_icache_page(struct page *page) |
| 419 | { |
| 420 | #ifdef CONFIG_BOOKE |
| 421 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); |
| 422 | __flush_dcache_icache(start); |
| 423 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 424 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 425 | /* On 8xx there is no need to kmap since highmem is not supported */ |
| 426 | __flush_dcache_icache(page_address(page)); |
| 427 | #else |
| 428 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); |
| 429 | #endif |
| 430 | |
| 431 | } |
| 432 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| 433 | { |
| 434 | clear_page(page); |
| 435 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 436 | /* |
| 437 | * We shouldnt have to do this, but some versions of glibc |
| 438 | * require it (ld.so assumes zero filled pages are icache clean) |
| 439 | * - Anton |
| 440 | */ |
David Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 441 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 442 | } |
| 443 | EXPORT_SYMBOL(clear_user_page); |
| 444 | |
| 445 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, |
| 446 | struct page *pg) |
| 447 | { |
| 448 | copy_page(vto, vfrom); |
| 449 | |
| 450 | /* |
| 451 | * We should be able to use the following optimisation, however |
| 452 | * there are two problems. |
| 453 | * Firstly a bug in some versions of binutils meant PLT sections |
| 454 | * were not marked executable. |
| 455 | * Secondly the first word in the GOT section is blrl, used |
| 456 | * to establish the GOT address. Until recently the GOT was |
| 457 | * not marked executable. |
| 458 | * - Anton |
| 459 | */ |
| 460 | #if 0 |
| 461 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) |
| 462 | return; |
| 463 | #endif |
| 464 | |
David Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 465 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, |
| 469 | unsigned long addr, int len) |
| 470 | { |
| 471 | unsigned long maddr; |
| 472 | |
| 473 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); |
| 474 | flush_icache_range(maddr, maddr + len); |
| 475 | kunmap(page); |
| 476 | } |
| 477 | EXPORT_SYMBOL(flush_icache_user_range); |
| 478 | |
| 479 | /* |
| 480 | * This is called at the end of handling a user page fault, when the |
| 481 | * fault has been handled by updating a PTE in the linux page tables. |
| 482 | * We use it to preload an HPTE into the hash table corresponding to |
| 483 | * the updated linux PTE. |
| 484 | * |
Hugh Dickins | 01edcd8 | 2005-11-23 13:37:39 -0800 | [diff] [blame] | 485 | * This must always be called with the pte lock held. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 486 | */ |
| 487 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
| 488 | pte_t pte) |
| 489 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 490 | #ifdef CONFIG_PPC_STD_MMU |
| 491 | unsigned long access = 0, trap; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 492 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 493 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
| 494 | if (!pte_young(pte) || address >= TASK_SIZE) |
| 495 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 496 | |
| 497 | /* We try to figure out if we are coming from an instruction |
| 498 | * access fault and pass that down to __hash_page so we avoid |
| 499 | * double-faulting on execution of fresh text. We have to test |
| 500 | * for regs NULL since init will get here first thing at boot |
| 501 | * |
| 502 | * We also avoid filling the hash if not coming from a fault |
| 503 | */ |
| 504 | if (current->thread.regs == NULL) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 505 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 506 | trap = TRAP(current->thread.regs); |
| 507 | if (trap == 0x400) |
| 508 | access |= _PAGE_EXEC; |
| 509 | else if (trap != 0x300) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 510 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 511 | hash_preload(vma->vm_mm, address, access, trap); |
| 512 | #endif /* CONFIG_PPC_STD_MMU */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 513 | } |