Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 23 | #undef DEBUG |
| 24 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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> |
David Gibson | 800fc3e | 2005-11-16 15:43:48 +1100 | [diff] [blame] | 67 | |
| 68 | #include "mmu_decl.h" |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 69 | |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 70 | #ifdef DEBUG |
| 71 | #define DBG(fmt...) printk(fmt) |
| 72 | #else |
| 73 | #define DBG(fmt...) |
| 74 | #endif |
| 75 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 197 | #ifdef CONFIG_PPC_64K_PAGES |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 198 | static const unsigned int pgtable_cache_size[3] = { |
| 199 | PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 200 | }; |
| 201 | static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 202 | "pte_pmd_cache", "pmd_cache", "pgd_cache", |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 203 | }; |
| 204 | #else |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 205 | static const unsigned int pgtable_cache_size[2] = { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | }; |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 211 | #endif /* CONFIG_PPC_64K_PAGES */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 212 | |
| 213 | kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; |
| 214 | |
| 215 | void pgtable_cache_init(void) |
| 216 | { |
| 217 | int i; |
| 218 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 87655ff | 2005-11-10 14:53:16 +1100 | [diff] [blame] | 223 | DBG("Allocating page table cache %s (#%d) " |
| 224 | "for size: %08x...\n", name, i, size); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 225 | pgtable_cache[i] = kmem_cache_create(name, |
| 226 | size, size, |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 227 | SLAB_HWCACHE_ALIGN | |
| 228 | SLAB_MUST_HWCACHE_ALIGN, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 229 | zero_ctor, |
| 230 | NULL); |
| 231 | if (! pgtable_cache[i]) |
| 232 | panic("pgtable_cache_init(): could not create %s!\n", |
| 233 | name); |
| 234 | } |
| 235 | } |