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 static struct kcore_list kcore_vmem;
 117
 118 static int __init setup_kcore(void)
 119 {
 120         int i;
 121
 122         for (i=0; i < lmb.memory.cnt; i++) {
 123                 unsigned long base, size;
 124                 struct kcore_list *kcore_mem;
 125
 126                 base = lmb.memory.region[i].base;
 127                 size = lmb.memory.region[i].size;
 128
 129                 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
 130                 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
 131                 if (!kcore_mem)
 132                         panic("%s: kmalloc failed\n", __FUNCTION__);
 133
 134                 kclist_add(kcore_mem, __va(base), size);
 135         }
 136
 137         kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
 138
 139         return 0;
 140 }
 141 module_init(setup_kcore);
 142
 143 static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags)
 144 {
 145         memset(addr, 0, kmem_cache_size(cache));
 146 }
 147
 148 static const unsigned int pgtable_cache_size[2] = {
 149         PGD_TABLE_SIZE, PMD_TABLE_SIZE
 150 };
 151 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 152 #ifdef CONFIG_PPC_64K_PAGES
 153         "pgd_cache", "pmd_cache",
 154 #else
 155         "pgd_cache", "pud_pmd_cache",
 156 #endif /* CONFIG_PPC_64K_PAGES */
 157 };
 158
 159 #ifdef CONFIG_HUGETLB_PAGE
 160 /* Hugepages need one extra cache, initialized in hugetlbpage.c.  We
 161  * can't put into the tables above, because HPAGE_SHIFT is not compile
 162  * time constant. */
 163 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1];
 164 #else
 165 struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 166 #endif
 167
 168 void pgtable_cache_init(void)
 169 {
 170         int i;
 171
 172         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 173                 int size = pgtable_cache_size[i];
 174                 const char *name = pgtable_cache_name[i];
 175
 176                 DBG("Allocating page table cache %s (#%d) "
 177                     "for size: %08x...\n", name, i, size);
 178                 pgtable_cache[i] = kmem_cache_create(name,
 179                                                      size, size,
 180                                                      SLAB_PANIC,
 181                                                      zero_ctor,
 182                                                      NULL);
 183         }
 184 }