arch/powerpc/mm/init_64.c

   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
   8  *
   9  *  Derived from "arch/i386/mm/init.c"
  10  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
  11  *
  12  *  Dave Engebretsen <engebret@us.ibm.com>
  13  *      Rework for PPC64 port.
  14  *
  15  *  This program is free software; you can redistribute it and/or
  16  *  modify it under the terms of the GNU General Public License
  17  *  as published by the Free Software Foundation; either version
  18  *  2 of the License, or (at your option) any later version.
  19  *
  20  */
  21
  22 #include <linux/signal.h>
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/string.h>
  27 #include <linux/types.h>
  28 #include <linux/mman.h>
  29 #include <linux/mm.h>
  30 #include <linux/swap.h>
  31 #include <linux/stddef.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/init.h>
  34 #include <linux/delay.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/highmem.h>
  37 #include <linux/idr.h>
  38 #include <linux/nodemask.h>
  39 #include <linux/module.h>
  40 #include <linux/poison.h>
  41 #include <linux/lmb.h>
  42
  43 #include <asm/pgalloc.h>
  44 #include <asm/page.h>
  45 #include <asm/prom.h>
  46 #include <asm/rtas.h>
  47 #include <asm/io.h>
  48 #include <asm/mmu_context.h>
  49 #include <asm/pgtable.h>
  50 #include <asm/mmu.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/smp.h>
  53 #include <asm/machdep.h>
  54 #include <asm/tlb.h>
  55 #include <asm/eeh.h>
  56 #include <asm/processor.h>
  57 #include <asm/mmzone.h>
  58 #include <asm/cputable.h>
  59 #include <asm/sections.h>
  60 #include <asm/system.h>
  61 #include <asm/iommu.h>
  62 #include <asm/abs_addr.h>
  63 #include <asm/vdso.h>
  64
  65 #include "mmu_decl.h"
  66
  67 #if PGTABLE_RANGE > USER_VSID_RANGE
  68 #warning Limited user VSID range means pagetable space is wasted
  69 #endif
  70
  71 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
  72 #warning TASK_SIZE is smaller than it needs to be.
  73 #endif
  74
  75 phys_addr_t memstart_addr = ~0;
  76 phys_addr_t kernstart_addr;
  77
  78 void free_initmem(void)
  79 {
  80         unsigned long addr;
  81
  82         addr = (unsigned long)__init_begin;
  83         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
  84                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
  85                 ClearPageReserved(virt_to_page(addr));
  86                 init_page_count(virt_to_page(addr));
  87                 free_page(addr);
  88                 totalram_pages++;
  89         }
  90         printk ("Freeing unused kernel memory: %luk freed\n",
  91                 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
  92 }
  93
  94 #ifdef CONFIG_BLK_DEV_INITRD
  95 void free_initrd_mem(unsigned long start, unsigned long end)
  96 {
  97         if (start < end)
  98                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
  99         for (; start < end; start += PAGE_SIZE) {
 100                 ClearPageReserved(virt_to_page(start));
 101                 init_page_count(virt_to_page(start));
 102                 free_page(start);
 103                 totalram_pages++;
 104         }
 105 }
 106 #endif
 107
 108 #ifdef CONFIG_PROC_KCORE
 109 static struct kcore_list kcore_vmem;
 110
 111 static int __init setup_kcore(void)
 112 {
 113         int i;
 114
 115         for (i=0; i < lmb.memory.cnt; i++) {
 116                 unsigned long base, size;
 117                 struct kcore_list *kcore_mem;
 118
 119                 base = lmb.memory.region[i].base;
 120                 size = lmb.memory.region[i].size;
 121
 122                 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
 123                 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
 124                 if (!kcore_mem)
 125                         panic("%s: kmalloc failed\n", __func__);
 126
 127                 kclist_add(kcore_mem, __va(base), size);
 128         }
 129
 130         kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
 131
 132         return 0;
 133 }
 134 module_init(setup_kcore);
 135 #endif
 136
 137 static void zero_ctor(struct kmem_cache *cache, void *addr)
 138 {
 139         memset(addr, 0, kmem_cache_size(cache));
 140 }
 141
 142 static const unsigned int pgtable_cache_size[2] = {
 143         PGD_TABLE_SIZE, PMD_TABLE_SIZE
 144 };
 145 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 146 #ifdef CONFIG_PPC_64K_PAGES
 147         "pgd_cache", "pmd_cache",
 148 #else
 149         "pgd_cache", "pud_pmd_cache",
 150 #endif /* CONFIG_PPC_64K_PAGES */
 151 };
 152
 153 #ifdef CONFIG_HUGETLB_PAGE
 154 /* Hugepages need one extra cache, initialized in hugetlbpage.c.  We
 155  * can't put into the tables above, because HPAGE_SHIFT is not compile
 156  * time constant. */
 157 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
 158 #else
 159 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 160 #endif
 161
 162 void pgtable_cache_init(void)
 163 {
 164         int i;
 165
 166         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 167                 int size = pgtable_cache_size[i];
 168                 const char *name = pgtable_cache_name[i];
 169
 170                 pr_debug("Allocating page table cache %s (#%d) "
 171                         "for size: %08x...\n", name, i, size);
 172                 pgtable_cache[i] = kmem_cache_create(name,
 173                                                      size, size,
 174                                                      SLAB_PANIC,
 175                                                      zero_ctor);
 176         }
 177 }
 178
 179 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 180 /*
 181  * Given an address within the vmemmap, determine the pfn of the page that
 182  * represents the start of the section it is within.  Note that we have to
 183  * do this by hand as the proffered address may not be correctly aligned.
 184  * Subtraction of non-aligned pointers produces undefined results.
 185  */
 186 unsigned long __meminit vmemmap_section_start(unsigned long page)
 187 {
 188         unsigned long offset = page - ((unsigned long)(vmemmap));
 189
 190         /* Return the pfn of the start of the section. */
 191         return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
 192 }
 193
 194 /*
 195  * Check if this vmemmap page is already initialised.  If any section
 196  * which overlaps this vmemmap page is initialised then this page is
 197  * initialised already.
 198  */
 199 int __meminit vmemmap_populated(unsigned long start, int page_size)
 200 {
 201         unsigned long end = start + page_size;
 202
 203         for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
 204                 if (pfn_valid(vmemmap_section_start(start)))
 205                         return 1;
 206
 207         return 0;
 208 }
 209
 210 int __meminit vmemmap_populate(struct page *start_page,
 211                                         unsigned long nr_pages, int node)
 212 {
 213         unsigned long mode_rw;
 214         unsigned long start = (unsigned long)start_page;
 215         unsigned long end = (unsigned long)(start_page + nr_pages);
 216         unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
 217
 218         mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
 219
 220         /* Align to the page size of the linear mapping. */
 221         start = _ALIGN_DOWN(start, page_size);
 222
 223         for (; start < end; start += page_size) {
 224                 int mapped;
 225                 void *p;
 226
 227                 if (vmemmap_populated(start, page_size))
 228                         continue;
 229
 230                 p = vmemmap_alloc_block(page_size, node);
 231                 if (!p)
 232                         return -ENOMEM;
 233
 234                 pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
 235                         start, p, __pa(p));
 236
 237                 mapped = htab_bolt_mapping(start, start + page_size,
 238                                         __pa(p), mode_rw, mmu_linear_psize,
 239                                         mmu_kernel_ssize);
 240                 BUG_ON(mapped < 0);
 241         }
 242
 243         return 0;
 244 }
 245 #endif