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 #undef DEBUG
  23
  24 #include <linux/signal.h>
  25 #include <linux/sched.h>
  26 #include <linux/kernel.h>
  27 #include <linux/errno.h>
  28 #include <linux/string.h>
  29 #include <linux/types.h>
  30 #include <linux/mman.h>
  31 #include <linux/mm.h>
  32 #include <linux/swap.h>
  33 #include <linux/stddef.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/init.h>
  36 #include <linux/delay.h>
  37 #include <linux/bootmem.h>
  38 #include <linux/highmem.h>
  39 #include <linux/idr.h>
  40 #include <linux/nodemask.h>
  41 #include <linux/module.h>
  42 #include <linux/poison.h>
  43
  44 #include <asm/pgalloc.h>
  45 #include <asm/page.h>
  46 #include <asm/prom.h>
  47 #include <asm/lmb.h>
  48 #include <asm/rtas.h>
  49 #include <asm/io.h>
  50 #include <asm/mmu_context.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/mmu.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/smp.h>
  55 #include <asm/machdep.h>
  56 #include <asm/tlb.h>
  57 #include <asm/eeh.h>
  58 #include <asm/processor.h>
  59 #include <asm/mmzone.h>
  60 #include <asm/cputable.h>
  61 #include <asm/sections.h>
  62 #include <asm/system.h>
  63 #include <asm/iommu.h>
  64 #include <asm/abs_addr.h>
  65 #include <asm/vdso.h>
  66
  67 #include "mmu_decl.h"
  68
  69 #ifdef DEBUG
  70 #define DBG(fmt...) printk(fmt)
  71 #else
  72 #define DBG(fmt...)
  73 #endif
  74
  75 #if PGTABLE_RANGE > USER_VSID_RANGE
  76 #warning Limited user VSID range means pagetable space is wasted
  77 #endif
  78
  79 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
  80 #warning TASK_SIZE is smaller than it needs to be.
  81 #endif
  82
  83 /* max amount of RAM to use */
  84 unsigned long __max_memory;
  85
  86 void free_initmem(void)
  87 {
  88         unsigned long addr;
  89
  90         addr = (unsigned long)__init_begin;
  91         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
  92                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
  93                 ClearPageReserved(virt_to_page(addr));
  94                 init_page_count(virt_to_page(addr));
  95                 free_page(addr);
  96                 totalram_pages++;
  97         }
  98         printk ("Freeing unused kernel memory: %luk freed\n",
  99                 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
 100 }
 101
 102 #ifdef CONFIG_BLK_DEV_INITRD
 103 void free_initrd_mem(unsigned long start, unsigned long end)
 104 {
 105         if (start < end)
 106                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 107         for (; start < end; start += PAGE_SIZE) {
 108                 ClearPageReserved(virt_to_page(start));
 109                 init_page_count(virt_to_page(start));
 110                 free_page(start);
 111                 totalram_pages++;
 112         }
 113 }
 114 #endif
 115
 116 #ifdef CONFIG_PROC_KCORE
 117 static struct kcore_list kcore_vmem;
 118
 119 static int __init setup_kcore(void)
 120 {
 121         int i;
 122
 123         for (i=0; i < lmb.memory.cnt; i++) {
 124                 unsigned long base, size;
 125                 struct kcore_list *kcore_mem;
 126
 127                 base = lmb.memory.region[i].base;
 128                 size = lmb.memory.region[i].size;
 129
 130                 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
 131                 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
 132                 if (!kcore_mem)
 133                         panic("%s: kmalloc failed\n", __FUNCTION__);
 134
 135                 kclist_add(kcore_mem, __va(base), size);
 136         }
 137
 138         kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
 139
 140         return 0;
 141 }
 142 module_init(setup_kcore);
 143 #endif
 144
 145 static void zero_ctor(struct kmem_cache *cache, void *addr)
 146 {
 147         memset(addr, 0, kmem_cache_size(cache));
 148 }
 149
 150 static const unsigned int pgtable_cache_size[2] = {
 151         PGD_TABLE_SIZE, PMD_TABLE_SIZE
 152 };
 153 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 154 #ifdef CONFIG_PPC_64K_PAGES
 155         "pgd_cache", "pmd_cache",
 156 #else
 157         "pgd_cache", "pud_pmd_cache",
 158 #endif /* CONFIG_PPC_64K_PAGES */
 159 };
 160
 161 #ifdef CONFIG_HUGETLB_PAGE
 162 /* Hugepages need one extra cache, initialized in hugetlbpage.c.  We
 163  * can't put into the tables above, because HPAGE_SHIFT is not compile
 164  * time constant. */
 165 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
 166 #else
 167 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 168 #endif
 169
 170 void pgtable_cache_init(void)
 171 {
 172         int i;
 173
 174         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 175                 int size = pgtable_cache_size[i];
 176                 const char *name = pgtable_cache_name[i];
 177
 178                 DBG("Allocating page table cache %s (#%d) "
 179                     "for size: %08x...\n", name, i, size);
 180                 pgtable_cache[i] = kmem_cache_create(name,
 181                                                      size, size,
 182                                                      SLAB_PANIC,
 183                                                      zero_ctor);
 184         }
 185 }
 186
 187 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 188 /*
 189  * Given an address within the vmemmap, determine the pfn of the page that
 190  * represents the start of the section it is within.  Note that we have to
 191  * do this by hand as the proffered address may not be correctly aligned.
 192  * Subtraction of non-aligned pointers produces undefined results.
 193  */
 194 unsigned long __meminit vmemmap_section_start(unsigned long page)
 195 {
 196         unsigned long offset = page - ((unsigned long)(vmemmap));
 197
 198         /* Return the pfn of the start of the section. */
 199         return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
 200 }
 201
 202 /*
 203  * Check if this vmemmap page is already initialised.  If any section
 204  * which overlaps this vmemmap page is initialised then this page is
 205  * initialised already.
 206  */
 207 int __meminit vmemmap_populated(unsigned long start, int page_size)
 208 {
 209         unsigned long end = start + page_size;
 210
 211         for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
 212                 if (pfn_valid(vmemmap_section_start(start)))
 213                         return 1;
 214
 215         return 0;
 216 }
 217
 218 int __meminit vmemmap_populate(struct page *start_page,
 219                                         unsigned long nr_pages, int node)
 220 {
 221         unsigned long mode_rw;
 222         unsigned long start = (unsigned long)start_page;
 223         unsigned long end = (unsigned long)(start_page + nr_pages);
 224         unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
 225
 226         mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
 227
 228         /* Align to the page size of the linear mapping. */
 229         start = _ALIGN_DOWN(start, page_size);
 230
 231         for (; start < end; start += page_size) {
 232                 int mapped;
 233                 void *p;
 234
 235                 if (vmemmap_populated(start, page_size))
 236                         continue;
 237
 238                 p = vmemmap_alloc_block(page_size, node);
 239                 if (!p)
 240                         return -ENOMEM;
 241
 242                 printk(KERN_WARNING "vmemmap %08lx allocated at %p, "
 243                                     "physical %08lx.\n", start, p, __pa(p));
 244
 245                 mapped = htab_bolt_mapping(start, start + page_size,
 246                                         __pa(p), mode_rw, mmu_linear_psize,
 247                                         mmu_kernel_ssize);
 248                 BUG_ON(mapped < 0);
 249         }
 250
 251         return 0;
 252 }
 253 #endif