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 #include <linux/config.h> 24 #include <linux/signal.h> 25 #include <linux/sched.h> 26 #include <linux/kernel.h> 27 #include <linux/errno.h> 28 #include <linux/string.h> 29 #include <linux/types.h> 30 #include <linux/mman.h> 31 #include <linux/mm.h> 32 #include <linux/swap.h> 33 #include <linux/stddef.h> 34 #include <linux/vmalloc.h> 35 #include <linux/init.h> 36 #include <linux/delay.h> 37 #include <linux/bootmem.h> 38 #include <linux/highmem.h> 39 #include <linux/idr.h> 40 #include <linux/nodemask.h> 41 #include <linux/module.h> 42 43 #include <asm/pgalloc.h> 44 #include <asm/page.h> 45 #include <asm/prom.h> 46 #include <asm/lmb.h> 47 #include <asm/rtas.h> 48 #include <asm/io.h> 49 #include <asm/mmu_context.h> 50 #include <asm/pgtable.h> 51 #include <asm/mmu.h> 52 #include <asm/uaccess.h> 53 #include <asm/smp.h> 54 #include <asm/machdep.h> 55 #include <asm/tlb.h> 56 #include <asm/eeh.h> 57 #include <asm/processor.h> 58 #include <asm/mmzone.h> 59 #include <asm/cputable.h> 60 #include <asm/ppcdebug.h> 61 #include <asm/sections.h> 62 #include <asm/system.h> 63 #include <asm/iommu.h> 64 #include <asm/abs_addr.h> 65 #include <asm/vdso.h> 66 #include <asm/imalloc.h> 67 68 #if PGTABLE_RANGE > USER_VSID_RANGE 69 #warning Limited user VSID range means pagetable space is wasted 70 #endif 71 72 #if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE) 73 #warning TASK_SIZE is smaller than it needs to be. 74 #endif 75 76 unsigned long klimit = (unsigned long)_end; 77 78 /* max amount of RAM to use */ 79 unsigned long __max_memory; 80 81 /* info on what we think the IO hole is */ 82 unsigned long io_hole_start; 83 unsigned long io_hole_size; 84 85 /* 86 * Do very early mm setup. 87 */ 88 void __init mm_init_ppc64(void) 89 { 90 #ifndef CONFIG_PPC_ISERIES 91 unsigned long i; 92 #endif 93 94 ppc64_boot_msg(0x100, "MM Init"); 95 96 /* This is the story of the IO hole... please, keep seated, 97 * unfortunately, we are out of oxygen masks at the moment. 98 * So we need some rough way to tell where your big IO hole 99 * is. On pmac, it's between 2G and 4G, on POWER3, it's around 100 * that area as well, on POWER4 we don't have one, etc... 101 * We need that as a "hint" when sizing the TCE table on POWER3 102 * So far, the simplest way that seem work well enough for us it 103 * to just assume that the first discontinuity in our physical 104 * RAM layout is the IO hole. That may not be correct in the future 105 * (and isn't on iSeries but then we don't care ;) 106 */ 107 108 #ifndef CONFIG_PPC_ISERIES 109 for (i = 1; i < lmb.memory.cnt; i++) { 110 unsigned long base, prevbase, prevsize; 111 112 prevbase = lmb.memory.region[i-1].base; 113 prevsize = lmb.memory.region[i-1].size; 114 base = lmb.memory.region[i].base; 115 if (base > (prevbase + prevsize)) { 116 io_hole_start = prevbase + prevsize; 117 io_hole_size = base - (prevbase + prevsize); 118 break; 119 } 120 } 121 #endif /* CONFIG_PPC_ISERIES */ 122 if (io_hole_start) 123 printk("IO Hole assumed to be %lx -> %lx\n", 124 io_hole_start, io_hole_start + io_hole_size - 1); 125 126 ppc64_boot_msg(0x100, "MM Init Done"); 127 } 128 129 void free_initmem(void) 130 { 131 unsigned long addr; 132 133 addr = (unsigned long)__init_begin; 134 for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) { 135 memset((void *)addr, 0xcc, PAGE_SIZE); 136 ClearPageReserved(virt_to_page(addr)); 137 set_page_count(virt_to_page(addr), 1); 138 free_page(addr); 139 totalram_pages++; 140 } 141 printk ("Freeing unused kernel memory: %luk freed\n", 142 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10); 143 } 144 145 #ifdef CONFIG_BLK_DEV_INITRD 146 void free_initrd_mem(unsigned long start, unsigned long end) 147 { 148 if (start < end) 149 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 150 for (; start < end; start += PAGE_SIZE) { 151 ClearPageReserved(virt_to_page(start)); 152 set_page_count(virt_to_page(start), 1); 153 free_page(start); 154 totalram_pages++; 155 } 156 } 157 #endif 158 159 static struct kcore_list kcore_vmem; 160 161 static int __init setup_kcore(void) 162 { 163 int i; 164 165 for (i=0; i < lmb.memory.cnt; i++) { 166 unsigned long base, size; 167 struct kcore_list *kcore_mem; 168 169 base = lmb.memory.region[i].base; 170 size = lmb.memory.region[i].size; 171 172 /* GFP_ATOMIC to avoid might_sleep warnings during boot */ 173 kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); 174 if (!kcore_mem) 175 panic("mem_init: kmalloc failed\n"); 176 177 kclist_add(kcore_mem, __va(base), size); 178 } 179 180 kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); 181 182 return 0; 183 } 184 module_init(setup_kcore); 185 186 static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags) 187 { 188 memset(addr, 0, kmem_cache_size(cache)); 189 } 190 191 #ifdef CONFIG_PPC_64K_PAGES 192 static const int pgtable_cache_size[2] = { 193 PTE_TABLE_SIZE, PGD_TABLE_SIZE 194 }; 195 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { 196 "pte_pmd_cache", "pgd_cache", 197 }; 198 #else 199 static const int pgtable_cache_size[2] = { 200 PTE_TABLE_SIZE, PMD_TABLE_SIZE 201 }; 202 static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = { 203 "pgd_pte_cache", "pud_pmd_cache", 204 }; 205 #endif /* CONFIG_PPC_64K_PAGES */ 206 207 kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)]; 208 209 void pgtable_cache_init(void) 210 { 211 int i; 212 213 for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) { 214 int size = pgtable_cache_size[i]; 215 const char *name = pgtable_cache_name[i]; 216 217 pgtable_cache[i] = kmem_cache_create(name, 218 size, size, 219 SLAB_HWCACHE_ALIGN | 220 SLAB_MUST_HWCACHE_ALIGN, 221 zero_ctor, 222 NULL); 223 if (! pgtable_cache[i]) 224 panic("pgtable_cache_init(): could not create %s!\n", 225 name); 226 } 227 } 228