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/config.h>
  26 #include <linux/signal.h>
  27 #include <linux/sched.h>
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/types.h>
  32 #include <linux/mman.h>
  33 #include <linux/mm.h>
  34 #include <linux/swap.h>
  35 #include <linux/stddef.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/init.h>
  38 #include <linux/delay.h>
  39 #include <linux/bootmem.h>
  40 #include <linux/highmem.h>
  41 #include <linux/idr.h>
  42 #include <linux/nodemask.h>
  43 #include <linux/module.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 /* info on what we think the IO hole is */
  88 unsigned long   io_hole_start;
  89 unsigned long   io_hole_size;
  90
  91 /*
  92  * Do very early mm setup.
  93  */
  94 void __init mm_init_ppc64(void)
  95 {
  96 #ifndef CONFIG_PPC_ISERIES
  97         unsigned long i;
  98 #endif
  99
 100         ppc64_boot_msg(0x100, "MM Init");
 101
 102         /* This is the story of the IO hole... please, keep seated,
 103          * unfortunately, we are out of oxygen masks at the moment.
 104          * So we need some rough way to tell where your big IO hole
 105          * is. On pmac, it's between 2G and 4G, on POWER3, it's around
 106          * that area as well, on POWER4 we don't have one, etc...
 107          * We need that as a "hint" when sizing the TCE table on POWER3
 108          * So far, the simplest way that seem work well enough for us it
 109          * to just assume that the first discontinuity in our physical
 110          * RAM layout is the IO hole. That may not be correct in the future
 111          * (and isn't on iSeries but then we don't care ;)
 112          */
 113
 114 #ifndef CONFIG_PPC_ISERIES
 115         for (i = 1; i < lmb.memory.cnt; i++) {
 116                 unsigned long base, prevbase, prevsize;
 117
 118                 prevbase = lmb.memory.region[i-1].base;
 119                 prevsize = lmb.memory.region[i-1].size;
 120                 base = lmb.memory.region[i].base;
 121                 if (base > (prevbase + prevsize)) {
 122                         io_hole_start = prevbase + prevsize;
 123                         io_hole_size = base  - (prevbase + prevsize);
 124                         break;
 125                 }
 126         }
 127 #endif /* CONFIG_PPC_ISERIES */
 128         if (io_hole_start)
 129                 printk("IO Hole assumed to be %lx -> %lx\n",
 130                        io_hole_start, io_hole_start + io_hole_size - 1);
 131
 132         ppc64_boot_msg(0x100, "MM Init Done");
 133 }
 134
 135 void free_initmem(void)
 136 {
 137         unsigned long addr;
 138
 139         addr = (unsigned long)__init_begin;
 140         for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
 141                 memset((void *)addr, 0xcc, PAGE_SIZE);
 142                 ClearPageReserved(virt_to_page(addr));
 143                 set_page_count(virt_to_page(addr), 1);
 144                 free_page(addr);
 145                 totalram_pages++;
 146         }
 147         printk ("Freeing unused kernel memory: %luk freed\n",
 148                 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
 149 }
 150
 151 #ifdef CONFIG_BLK_DEV_INITRD
 152 void free_initrd_mem(unsigned long start, unsigned long end)
 153 {
 154         if (start < end)
 155                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 156         for (; start < end; start += PAGE_SIZE) {
 157                 ClearPageReserved(virt_to_page(start));
 158                 set_page_count(virt_to_page(start), 1);
 159                 free_page(start);
 160                 totalram_pages++;
 161         }
 162 }
 163 #endif
 164
 165 static struct kcore_list kcore_vmem;
 166
 167 static int __init setup_kcore(void)
 168 {
 169         int i;
 170
 171         for (i=0; i < lmb.memory.cnt; i++) {
 172                 unsigned long base, size;
 173                 struct kcore_list *kcore_mem;
 174
 175                 base = lmb.memory.region[i].base;
 176                 size = lmb.memory.region[i].size;
 177
 178                 /* GFP_ATOMIC to avoid might_sleep warnings during boot */
 179                 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
 180                 if (!kcore_mem)
 181                         panic("mem_init: kmalloc failed\n");
 182
 183                 kclist_add(kcore_mem, __va(base), size);
 184         }
 185
 186         kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
 187
 188         return 0;
 189 }
 190 module_init(setup_kcore);
 191
 192 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
 193 {
 194         memset(addr, 0, kmem_cache_size(cache));
 195 }
 196
 197 #ifdef CONFIG_PPC_64K_PAGES
 198 static const unsigned int pgtable_cache_size[3] = {
 199         PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE
 200 };
 201 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 202         "pte_pmd_cache", "pmd_cache", "pgd_cache",
 203 };
 204 #else
 205 static const unsigned int pgtable_cache_size[2] = {
 206         PTE_TABLE_SIZE, PMD_TABLE_SIZE
 207 };
 208 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
 209         "pgd_pte_cache", "pud_pmd_cache",
 210 };
 211 #endif /* CONFIG_PPC_64K_PAGES */
 212
 213 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
 214
 215 void pgtable_cache_init(void)
 216 {
 217         int i;
 218
 219         for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
 220                 int size = pgtable_cache_size[i];
 221                 const char *name = pgtable_cache_name[i];
 222
 223                 DBG("Allocating page table cache %s (#%d) "
 224                     "for size: %08x...\n", name, i, size);
 225                 pgtable_cache[i] = kmem_cache_create(name,
 226                                                      size, size,
 227                                                      SLAB_HWCACHE_ALIGN |
 228                                                      SLAB_MUST_HWCACHE_ALIGN,
 229                                                      zero_ctor,
 230                                                      NULL);
 231                 if (! pgtable_cache[i])
 232                         panic("pgtable_cache_init(): could not create %s!\n",
 233                               name);
 234         }
 235 }