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 #include <asm/imalloc.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 unsigned long klimit = (unsigned long)_end; 84 85 /* max amount of RAM to use */ 86 unsigned long __max_memory; 87 88 /* info on what we think the IO hole is */ 89 unsigned long io_hole_start; 90 unsigned long io_hole_size; 91 92 /* 93 * Do very early mm setup. 94 */ 95 void __init mm_init_ppc64(void) 96 { 97 #ifndef CONFIG_PPC_ISERIES 98 unsigned long i; 99 #endif 100 101 ppc64_boot_msg(0x100, "MM Init"); 102 103 /* This is the story of the IO hole... please, keep seated, 104 * unfortunately, we are out of oxygen masks at the moment. 105 * So we need some rough way to tell where your big IO hole 106 * is. On pmac, it's between 2G and 4G, on POWER3, it's around 107 * that area as well, on POWER4 we don't have one, etc... 108 * We need that as a "hint" when sizing the TCE table on POWER3 109 * So far, the simplest way that seem work well enough for us it 110 * to just assume that the first discontinuity in our physical 111 * RAM layout is the IO hole. That may not be correct in the future 112 * (and isn't on iSeries but then we don't care ;) 113 */ 114 115 #ifndef CONFIG_PPC_ISERIES 116 for (i = 1; i < lmb.memory.cnt; i++) { 117 unsigned long base, prevbase, prevsize; 118 119 prevbase = lmb.memory.region[i-1].base; 120 prevsize = lmb.memory.region[i-1].size; 121 base = lmb.memory.region[i].base; 122 if (base > (prevbase + prevsize)) { 123 io_hole_start = prevbase + prevsize; 124 io_hole_size = base - (prevbase + prevsize); 125 break; 126 } 127 } 128 #endif /* CONFIG_PPC_ISERIES */ 129 if (io_hole_start) 130 printk("IO Hole assumed to be %lx -> %lx\n", 131 io_hole_start, io_hole_start + io_hole_size - 1); 132 133 ppc64_boot_msg(0x100, "MM Init Done"); 134 } 135 136 void free_initmem(void) 137 { 138 unsigned long addr; 139 140 addr = (unsigned long)__init_begin; 141 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { 142 memset((void *)addr, 0xcc, PAGE_SIZE); 143 ClearPageReserved(virt_to_page(addr)); 144 set_page_count(virt_to_page(addr), 1); 145 free_page(addr); 146 totalram_pages++; 147 } 148 printk ("Freeing unused kernel memory: %luk freed\n", 149 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); 150 } 151 152 #ifdef CONFIG_BLK_DEV_INITRD 153 void free_initrd_mem(unsigned long start, unsigned long end) 154 { 155 if (start < end) 156 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 157 for (; start < end; start += PAGE_SIZE) { 158 ClearPageReserved(virt_to_page(start)); 159 set_page_count(virt_to_page(start), 1); 160 free_page(start); 161 totalram_pages++; 162 } 163 } 164 #endif 165 166 static struct kcore_list kcore_vmem; 167 168 static int __init setup_kcore(void) 169 { 170 int i; 171 172 for (i=0; i < lmb.memory.cnt; i++) { 173 unsigned long base, size; 174 struct kcore_list *kcore_mem; 175 176 base = lmb.memory.region[i].base; 177 size = lmb.memory.region[i].size; 178 179 /* GFP_ATOMIC to avoid might_sleep warnings during boot */ 180 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); 181 if (!kcore_mem) 182 panic("mem_init: kmalloc failed\n"); 183 184 kclist_add(kcore_mem, __va(base), size); 185 } 186 187 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); 188 189 return 0; 190 } 191 module_init(setup_kcore); 192 193 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) 194 { 195 memset(addr, 0, kmem_cache_size(cache)); 196 } 197 198 #ifdef CONFIG_PPC_64K_PAGES 199 static const unsigned int pgtable_cache_size[3] = { 200 PTE_TABLE_SIZE, PMD_TABLE_SIZE, PGD_TABLE_SIZE 201 }; 202 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { 203 "pte_pmd_cache", "pmd_cache", "pgd_cache", 204 }; 205 #else 206 static const unsigned int pgtable_cache_size[2] = { 207 PTE_TABLE_SIZE, PMD_TABLE_SIZE 208 }; 209 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { 210 "pgd_pte_cache", "pud_pmd_cache", 211 }; 212 #endif /* CONFIG_PPC_64K_PAGES */ 213 214 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; 215 216 void pgtable_cache_init(void) 217 { 218 int i; 219 220 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { 221 int size = pgtable_cache_size[i]; 222 const char *name = pgtable_cache_name[i]; 223 224 DBG("Allocating page table cache %s (#%d) " 225 "for size: %08x...\n", name, i, size); 226 pgtable_cache[i] = kmem_cache_create(name, 227 size, size, 228 SLAB_HWCACHE_ALIGN | 229 SLAB_MUST_HWCACHE_ALIGN, 230 zero_ctor, 231 NULL); 232 if (! pgtable_cache[i]) 233 panic("pgtable_cache_init(): could not create %s!\n", 234 name); 235 } 236 } 237