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  *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
   9  *
  10  *  Derived from "arch/i386/mm/init.c"
  11  *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
  12  *
  13  *  Dave Engebretsen <engebret@us.ibm.com>
  14  *      Rework for PPC64 port.
  15  *
  16  *  This program is free software; you can redistribute it and/or
  17  *  modify it under the terms of the GNU General Public License
  18  *  as published by the Free Software Foundation; either version
  19  *  2 of the License, or (at your option) any later version.
  20  *
  21  */
  22
  23 #undef DEBUG
  24
  25 #include <linux/signal.h>
  26 #include <linux/sched.h>
  27 #include <linux/kernel.h>
  28 #include <linux/errno.h>
  29 #include <linux/string.h>
  30 #include <linux/types.h>
  31 #include <linux/mman.h>
  32 #include <linux/mm.h>
  33 #include <linux/swap.h>
  34 #include <linux/stddef.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/init.h>
  37 #include <linux/delay.h>
  38 #include <linux/bootmem.h>
  39 #include <linux/highmem.h>
  40 #include <linux/idr.h>
  41 #include <linux/nodemask.h>
  42 #include <linux/module.h>
  43 #include <linux/poison.h>
  44
  45 #include <asm/pgalloc.h>
  46 #include <asm/page.h>
  47 #include <asm/prom.h>
  48 #include <asm/lmb.h>
  49 #include <asm/rtas.h>
  50 #include <asm/io.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/pgtable.h>
  53 #include <asm/mmu.h>
  54 #include <asm/uaccess.h>
  55 #include <asm/smp.h>
  56 #include <asm/machdep.h>
  57 #include <asm/tlb.h>
  58 #include <asm/eeh.h>
  59 #include <asm/processor.h>
  60 #include <asm/mmzone.h>
  61 #include <asm/cputable.h>
  62 #include <asm/sections.h>
  63 #include <asm/system.h>
  64 #include <asm/iommu.h>
  65 #include <asm/abs_addr.h>
  66 #include <asm/vdso.h>
  67
  68 #include "mmu_decl.h"
  69
  70 #ifdef DEBUG
  71 #define DBG(fmt...) printk(fmt)
  72 #else
  73 #define DBG(fmt...)
  74 #endif
  75
  76 #if PGTABLE_RANGE > USER_VSID_RANGE
  77 #warning Limited user VSID range means pagetable space is wasted
  78 #endif
  79
  80 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
  81 #warning TASK_SIZE is smaller than it needs to be.
  82 #endif
  83
  84 /* max amount of RAM to use */
  85 unsigned long __max_memory;
  86
  87 void free_initmem(void)
  88 {
  89         unsigned long addr;
  90
  91         addr = (unsigned long)__init_begin;
  92         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
  93                 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
  94                 ClearPageReserved(virt_to_page(addr));
  95                 init_page_count(virt_to_page(addr));
  96                 free_page(addr);
  97                 totalram_pages++;
  98         }
  99         printk ("Freeing unused kernel memory: %luk freed\n",
 100                 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
 101 }
 102
 103 #ifdef CONFIG_BLK_DEV_INITRD
 104 void free_initrd_mem(unsigned long start, unsigned long end)
 105 {
 106         if (start < end)
 107                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 108         for (; start < end; start += PAGE_SIZE) {
 109                 ClearPageReserved(virt_to_page(start));
 110                 init_page_count(virt_to_page(start));
 111                 free_page(start);
 112                 totalram_pages++;
 113         }
 114 }
 115 #endif
 116
 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("mem_init: kmalloc failed\n");
 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
 144 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
 145 {
 146         memset(addr, 0, kmem_cache_size(cache));
 147 }
 148
 149 #ifdef CONFIG_PPC_64K_PAGES
 150 static const unsigned int pgtable_cache_size[3] = {
 151         PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
 152 };
 153 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 154         "pte_pmd_cache", "pmd_cache", "pgd_cache",
 155 };
 156 #else
 157 static const unsigned int pgtable_cache_size[2] = {
 158         PTE_TABLE_SIZE, PMD_TABLE_SIZE
 159 };
 160 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 161         "pgd_pte_cache", "pud_pmd_cache",
 162 };
 163 #endif /* CONFIG_PPC_64K_PAGES */
 164
 165 #ifdef CONFIG_HUGETLB_PAGE
 166 /* Hugepages need one extra cache, initialized in hugetlbpage.c.  We
 167  * can't put into the tables above, because HPAGE_SHIFT is not compile
 168  * time constant. */
 169 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
 170 #else
 171 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 172 #endif
 173
 174 void pgtable_cache_init(void)
 175 {
 176         int i;
 177
 178         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 179                 int size = pgtable_cache_size[i];
 180                 const char *name = pgtable_cache_name[i];
 181
 182                 DBG("Allocating page table cache %s (#%d) "
 183                     "for size: %08x...\n", name, i, size);
 184                 pgtable_cache[i] = kmem_cache_create(name,
 185                                                      size, size,
 186                                                      SLAB_HWCACHE_ALIGN |
 187                                                      SLAB_MUST_HWCACHE_ALIGN,
 188                                                      zero_ctor,
 189                                                      NULL);
 190                 if (! pgtable_cache[i])
 191                         panic("pgtable_cache_init(): could not create %s!\n",
 192                               name);
 193         }
 194 }