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 } 195