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 */ 85unsigned long __max_memory; 86 87void 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 104void 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 117static struct kcore_list kcore_vmem; 118 119static 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("%s: kmalloc failed\n", __FUNCTION__); 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} 142module_init(setup_kcore); 143 144static void zero_ctor(void *addr, struct kmem_cache *cache, unsigned long flags) 145{ 146 memset(addr, 0, kmem_cache_size(cache)); 147} 148 149static const unsigned int pgtable_cache_size[2] = { 150 PGD_TABLE_SIZE, PMD_TABLE_SIZE 151}; 152static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { 153#ifdef CONFIG_PPC_64K_PAGES 154 "pgd_cache", "pmd_cache", 155#else 156 "pgd_cache", "pud_pmd_cache", 157#endif /* CONFIG_PPC_64K_PAGES */ 158}; 159 160#ifdef CONFIG_HUGETLB_PAGE 161/* Hugepages need one extra cache, initialized in hugetlbpage.c. We 162 * can't put into the tables above, because HPAGE_SHIFT is not compile 163 * time constant. */ 164struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+1]; 165#else 166struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; 167#endif 168 169void pgtable_cache_init(void) 170{ 171 int i; 172 173 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { 174 int size = pgtable_cache_size[i]; 175 const char *name = pgtable_cache_name[i]; 176 177 DBG("Allocating page table cache %s (#%d) " 178 "for size: %08x...\n", name, i, size); 179 pgtable_cache[i] = kmem_cache_create(name, 180 size, size, 181 SLAB_PANIC, 182 zero_ctor, 183 NULL); 184 } 185} 186