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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/gfp.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 26 | #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 Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 34 | #include <linux/suspend.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 35 | #include <linux/memblock.h> |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 36 | #include <linux/hugetlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 37 | |
| 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 48 | #include <asm/sections.h> |
Tony Breeds | db7f37d | 2008-07-01 11:30:06 +1000 | [diff] [blame] | 49 | #include <asm/sparsemem.h> |
Paul Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 50 | #include <asm/vdso.h> |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 51 | #include <asm/fixmap.h> |
FUJITA Tomonori | a932729 | 2010-03-16 13:16:25 +0000 | [diff] [blame] | 52 | #include <asm/swiotlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 53 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 54 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 61 | int init_bootmem_done; |
| 62 | int mem_init_done; |
Becky Bruce | 49a8496 | 2009-05-08 12:19:27 +0000 | [diff] [blame] | 63 | phys_addr_t memory_limit; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 64 | |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 65 | #ifdef CONFIG_HIGHMEM |
| 66 | pte_t *kmap_pte; |
| 67 | pgprot_t kmap_prot; |
| 68 | |
| 69 | EXPORT_SYMBOL(kmap_prot); |
| 70 | EXPORT_SYMBOL(kmap_pte); |
| 71 | |
| 72 | static 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 79 | int page_is_ram(unsigned long pfn) |
| 80 | { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 81 | #ifndef CONFIG_PPC64 /* XXX for now */ |
Roland Dreier | a880e76 | 2008-09-15 10:43:35 +0000 | [diff] [blame] | 82 | return pfn < max_pfn; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 83 | #else |
Roland Dreier | a880e76 | 2008-09-15 10:43:35 +0000 | [diff] [blame] | 84 | unsigned long paddr = (pfn << PAGE_SHIFT); |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 85 | struct memblock_region *reg; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 86 | |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 87 | for_each_memblock(memory, reg) |
| 88 | if (paddr >= reg->base && paddr < (reg->base + reg->size)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 89 | return 1; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 90 | return 0; |
| 91 | #endif |
| 92 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 93 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 94 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 95 | unsigned long size, pgprot_t vma_prot) |
| 96 | { |
| 97 | if (ppc_md.phys_mem_access_prot) |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 98 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | |
Roland Dreier | 8b15047 | 2005-10-28 17:46:18 -0700 | [diff] [blame] | 100 | if (!page_is_ram(pfn)) |
Benjamin Herrenschmidt | 64b3d0e | 2008-12-18 19:13:51 +0000 | [diff] [blame] | 101 | vma_prot = pgprot_noncached(vma_prot); |
| 102 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 103 | return vma_prot; |
| 104 | } |
| 105 | EXPORT_SYMBOL(phys_mem_access_prot); |
| 106 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 107 | #ifdef CONFIG_MEMORY_HOTPLUG |
| 108 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 109 | #ifdef CONFIG_NUMA |
| 110 | int memory_add_physaddr_to_nid(u64 start) |
| 111 | { |
| 112 | return hot_add_scn_to_nid(start); |
| 113 | } |
| 114 | #endif |
| 115 | |
Geert Uytterhoeven | fa90f70 | 2008-03-29 03:10:50 +1100 | [diff] [blame] | 116 | int arch_add_memory(int nid, u64 start, u64 size) |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 117 | { |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 118 | struct pglist_data *pgdata; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 119 | struct zone *zone; |
| 120 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 121 | unsigned long nr_pages = size >> PAGE_SHIFT; |
| 122 | |
Mike Kravetz | 237a098 | 2005-12-05 12:06:42 -0800 | [diff] [blame] | 123 | pgdata = NODE_DATA(nid); |
| 124 | |
Andrew Morton | 2d0eee1 | 2006-03-21 23:00:05 -0800 | [diff] [blame] | 125 | start = (unsigned long)__va(start); |
Mike Kravetz | 54b7924 | 2005-11-07 16:25:48 -0800 | [diff] [blame] | 126 | create_section_mapping(start, start + size); |
| 127 | |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 128 | /* this should work for most non-highmem platforms */ |
| 129 | zone = pgdata->node_zones; |
| 130 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 131 | return __add_pages(nid, zone, start_pfn, nr_pages); |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 132 | } |
Nathan Lynch | 0d57994 | 2008-06-04 08:30:54 +1000 | [diff] [blame] | 133 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * 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] | 137 | * memory range. PPC64 does not maintain the memory layout in /proc/iomem. |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 138 | * Instead it maintains it in memblock.memory structures. Walk through the |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 139 | * memory regions, find holes and callback for contiguous regions. |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 140 | */ |
| 141 | int |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 142 | walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
| 143 | void *arg, int (*func)(unsigned long, unsigned long, void *)) |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 144 | { |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 145 | struct memblock_region *reg; |
| 146 | unsigned long end_pfn = start_pfn + nr_pages; |
| 147 | unsigned long tstart, tend; |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 148 | int ret = -1; |
| 149 | |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 150 | for_each_memblock(memory, reg) { |
| 151 | tstart = max(start_pfn, memblock_region_base_pfn(reg)); |
| 152 | tend = min(end_pfn, memblock_region_end_pfn(reg)); |
| 153 | if (tstart >= tend) |
| 154 | continue; |
| 155 | ret = (*func)(tstart, tend - tstart, arg); |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 156 | if (ret) |
| 157 | break; |
Badari Pulavarty | 9d88a2e | 2008-04-18 13:33:53 -0700 | [diff] [blame] | 158 | } |
| 159 | return ret; |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 160 | } |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 161 | EXPORT_SYMBOL_GPL(walk_system_ram_range); |
Badari Pulavarty | a99824f | 2008-02-05 00:10:18 -0800 | [diff] [blame] | 162 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 163 | /* |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 164 | * 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 |
| 169 | void __init do_init_bootmem(void) |
| 170 | { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 171 | unsigned long start, bootmap_pages; |
| 172 | unsigned long total_pages; |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 173 | struct memblock_region *reg; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 174 | int boot_mapsize; |
| 175 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 176 | max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
| 177 | total_pages = (memblock_end_of_DRAM() - memstart_addr) >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 178 | #ifdef CONFIG_HIGHMEM |
| 179 | total_pages = total_lowmem >> PAGE_SHIFT; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 180 | max_low_pfn = lowmem_end_addr >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 181 | #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 Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 190 | start = memblock_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 191 | |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 192 | 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 194 | |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 195 | /* Add active regions with valid PFNs */ |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 196 | for_each_memblock(memory, reg) { |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 197 | unsigned long start_pfn, end_pfn; |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 198 | start_pfn = memblock_region_base_pfn(reg); |
| 199 | end_pfn = memblock_region_end_pfn(reg); |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 200 | add_active_range(0, start_pfn, end_pfn); |
| 201 | } |
| 202 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 203 | /* Add all physical memory to the bootmem map, mark each area |
| 204 | * present. |
| 205 | */ |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 206 | #ifdef CONFIG_HIGHMEM |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 207 | free_bootmem_with_active_regions(0, lowmem_end_addr >> PAGE_SHIFT); |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 208 | |
| 209 | /* reserve the sections we're already using */ |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 210 | 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 Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 217 | } |
| 218 | } |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 219 | #else |
| 220 | free_bootmem_with_active_regions(0, max_pfn); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 221 | |
| 222 | /* reserve the sections we're already using */ |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 223 | for_each_memblock(reserved, reg) |
| 224 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 225 | #endif |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 226 | /* XXX need to clip this if using highmem? */ |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 227 | sparse_memory_present_with_active_regions(0); |
| 228 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 229 | init_bootmem_done = 1; |
| 230 | } |
| 231 | |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 232 | /* mark pages that don't exist as nosave */ |
| 233 | static int __init mark_nonram_nosave(void) |
| 234 | { |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 235 | struct memblock_region *reg, *prev = NULL; |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 236 | |
Benjamin Herrenschmidt | 28be707 | 2010-08-04 13:43:53 +1000 | [diff] [blame] | 237 | for_each_memblock(memory, reg) { |
| 238 | if (prev && |
| 239 | memblock_region_end_pfn(prev) < memblock_region_base_pfn(reg)) |
| 240 | register_nosave_region(memblock_region_end_pfn(prev), |
| 241 | memblock_region_base_pfn(reg)); |
| 242 | prev = reg; |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 243 | } |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 244 | return 0; |
| 245 | } |
| 246 | |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 247 | /* |
| 248 | * paging_init() sets up the page tables - in fact we've already done this. |
| 249 | */ |
| 250 | void __init paging_init(void) |
| 251 | { |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 252 | unsigned long total_ram = memblock_phys_mem_size(); |
| 253 | phys_addr_t top_of_ram = memblock_end_of_DRAM(); |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 254 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 255 | |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 256 | #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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 264 | #ifdef CONFIG_HIGHMEM |
| 265 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ |
Kumar Gala | 2c419bd | 2008-04-23 23:05:20 +1000 | [diff] [blame] | 266 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); |
| 267 | |
| 268 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 269 | kmap_prot = PAGE_KERNEL; |
| 270 | #endif /* CONFIG_HIGHMEM */ |
| 271 | |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 272 | 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] | 273 | (unsigned long long)top_of_ram, total_ram); |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 274 | printk(KERN_DEBUG "Memory hole size: %ldMB\n", |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 275 | (long int)((top_of_ram - total_ram) >> 20)); |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 276 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 277 | #ifdef CONFIG_HIGHMEM |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 278 | max_zone_pfns[ZONE_DMA] = lowmem_end_addr >> PAGE_SHIFT; |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 279 | max_zone_pfns[ZONE_HIGHMEM] = top_of_ram >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 280 | #else |
Mel Gorman | 6391af1 | 2006-10-11 01:20:39 -0700 | [diff] [blame] | 281 | max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; |
Mel Gorman | c67c3cb | 2006-09-27 01:49:49 -0700 | [diff] [blame] | 282 | #endif |
| 283 | free_area_init_nodes(max_zone_pfns); |
Johannes Berg | 4e8ad3e | 2007-05-08 19:25:00 +1000 | [diff] [blame] | 284 | |
| 285 | mark_nonram_nosave(); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 286 | } |
| 287 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ |
| 288 | |
| 289 | void __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 Tomonori | a932729 | 2010-03-16 13:16:25 +0000 | [diff] [blame] | 299 | #ifdef CONFIG_SWIOTLB |
| 300 | if (ppc_swiotlb_enable) |
| 301 | swiotlb_init(1); |
| 302 | #endif |
| 303 | |
Benjamin Herrenschmidt | 4734b59 | 2010-07-28 14:31:29 +1000 | [diff] [blame^] | 304 | num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 305 | 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 Blanchard | c258dd4 | 2006-03-25 17:27:09 +1100 | [diff] [blame] | 310 | printk("freeing bootmem node %d\n", nid); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 311 | totalram_pages += |
| 312 | free_all_bootmem_node(NODE_DATA(nid)); |
| 313 | } |
| 314 | } |
| 315 | #else |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 316 | max_mapnr = max_pfn; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 317 | totalram_pages += free_all_bootmem(); |
| 318 | #endif |
KAMEZAWA Hiroyuki | ec936fc | 2006-03-27 01:15:59 -0800 | [diff] [blame] | 319 | for_each_online_pgdat(pgdat) { |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 320 | for (i = 0; i < pgdat->node_spanned_pages; i++) { |
Paul Mackerras | fb6d73d | 2005-11-16 11:43:26 +1100 | [diff] [blame] | 321 | if (!pfn_valid(pgdat->node_start_pfn + i)) |
| 322 | continue; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 323 | page = pgdat_page_nr(pgdat, i); |
| 324 | if (PageReserved(page)) |
| 325 | reservedpages++; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; |
Anton Blanchard | bcb3557 | 2005-11-07 17:43:07 +1100 | [diff] [blame] | 330 | datasize = (unsigned long)&_edata - (unsigned long)&_sdata; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 331 | 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 Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 338 | highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 339 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { |
| 340 | struct page *page = pfn_to_page(pfn); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 341 | if (memblock_is_reserved(pfn << PAGE_SHIFT)) |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 342 | continue; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 343 | ClearPageReserved(page); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 344 | init_page_count(page); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 345 | __free_page(page); |
| 346 | totalhigh_pages++; |
Kumar Gala | f98eeb4 | 2008-01-09 11:27:23 -0600 | [diff] [blame] | 347 | reservedpages--; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 348 | } |
| 349 | totalram_pages += totalhigh_pages; |
Olof Johansson | e110b28 | 2006-04-12 15:25:01 -0500 | [diff] [blame] | 350 | printk(KERN_DEBUG "High memory: %luk\n", |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 351 | 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 Uytterhoeven | cc013a8 | 2009-09-21 17:02:36 -0700 | [diff] [blame] | 357 | nr_free_pages() << (PAGE_SHIFT-10), |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 358 | num_physpages << (PAGE_SHIFT-10), |
| 359 | codesize >> 10, |
| 360 | reservedpages << (PAGE_SHIFT-10), |
| 361 | datasize >> 10, |
| 362 | bsssize >> 10, |
| 363 | initsize >> 10); |
| 364 | |
Benjamin Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 365 | #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 Herrenschmidt | 8b31e49 | 2009-05-27 13:50:33 +1000 | [diff] [blame] | 372 | #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 Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 376 | 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 Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 382 | mem_init_done = 1; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 386 | * 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 | */ |
| 390 | void 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 | } |
| 398 | EXPORT_SYMBOL(flush_dcache_page); |
| 399 | |
| 400 | void flush_dcache_icache_page(struct page *page) |
| 401 | { |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 402 | #ifdef CONFIG_HUGETLB_PAGE |
| 403 | if (PageCompound(page)) { |
| 404 | flush_dcache_icache_hugepage(page); |
| 405 | return; |
| 406 | } |
| 407 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 408 | #ifdef CONFIG_BOOKE |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 409 | { |
| 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 Mackerras | ab1f9da | 2005-10-10 21:58:35 +1000 | [diff] [blame] | 414 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 415 | /* 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 420 | } |
David Gibson | 0895ecd | 2009-10-26 19:24:31 +0000 | [diff] [blame] | 421 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 422 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) |
| 423 | { |
| 424 | clear_page(page); |
| 425 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 426 | /* |
| 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 Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 431 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 432 | } |
| 433 | EXPORT_SYMBOL(clear_user_page); |
| 434 | |
| 435 | void 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 Gibson | 09f5dc4 | 2006-02-06 13:24:53 +1100 | [diff] [blame] | 455 | flush_dcache_page(pg); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | void 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 | } |
| 467 | EXPORT_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 Dickins | 01edcd8 | 2005-11-23 13:37:39 -0800 | [diff] [blame] | 475 | * This must always be called with the pte lock held. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 476 | */ |
| 477 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 478 | pte_t *ptep) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 479 | { |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 480 | #ifdef CONFIG_PPC_STD_MMU |
| 481 | unsigned long access = 0, trap; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 482 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 483 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 484 | if (!pte_young(*ptep) || address >= TASK_SIZE) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 485 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 486 | |
| 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 Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 495 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 496 | trap = TRAP(current->thread.regs); |
| 497 | if (trap == 0x400) |
| 498 | access |= _PAGE_EXEC; |
| 499 | else if (trap != 0x300) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 500 | return; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 501 | hash_preload(vma->vm_mm, address, access, trap); |
| 502 | #endif /* CONFIG_PPC_STD_MMU */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 503 | } |