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 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 8 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) |
| 9 | * |
| 10 | * Derived from "arch/i386/mm/init.c" |
| 11 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | * |
| 18 | */ |
| 19 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/stddef.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/bootmem.h> |
| 30 | #include <linux/highmem.h> |
| 31 | #include <linux/initrd.h> |
| 32 | #include <linux/pagemap.h> |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 33 | #include <linux/memblock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/gfp.h> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 35 | #include <linux/slab.h> |
| 36 | #include <linux/hugetlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 37 | |
| 38 | #include <asm/pgalloc.h> |
| 39 | #include <asm/prom.h> |
| 40 | #include <asm/io.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 41 | #include <asm/pgtable.h> |
| 42 | #include <asm/mmu.h> |
| 43 | #include <asm/smp.h> |
| 44 | #include <asm/machdep.h> |
| 45 | #include <asm/btext.h> |
| 46 | #include <asm/tlb.h> |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 47 | #include <asm/sections.h> |
Michael Ellerman | 5f25f065 | 2008-05-08 14:27:07 +1000 | [diff] [blame] | 48 | #include <asm/system.h> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 49 | #include <asm/hugetlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 51 | #include "mmu_decl.h" |
| 52 | |
| 53 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) |
Uwe Kleine-König | 9ddc5b6 | 2010-01-20 17:02:24 +0100 | [diff] [blame] | 54 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
Dale Farnsworth | ccdcef7 | 2008-12-17 10:09:13 +0000 | [diff] [blame] | 55 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 56 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL" |
| 57 | #endif |
| 58 | #endif |
| 59 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE |
| 60 | |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 61 | phys_addr_t total_memory; |
| 62 | phys_addr_t total_lowmem; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 63 | |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 64 | phys_addr_t memstart_addr = (phys_addr_t)~0ull; |
| 65 | EXPORT_SYMBOL(memstart_addr); |
| 66 | phys_addr_t kernstart_addr; |
| 67 | EXPORT_SYMBOL(kernstart_addr); |
Suzuki Poulose | 368ff8f | 2011-12-14 22:58:37 +0000 | [diff] [blame^] | 68 | |
| 69 | #ifdef CONFIG_RELOCATABLE_PPC32 |
| 70 | /* Used in __va()/__pa() */ |
| 71 | long long virt_phys_offset; |
| 72 | EXPORT_SYMBOL(virt_phys_offset); |
| 73 | #endif |
| 74 | |
Kumar Gala | 99c62dd7 | 2008-04-16 05:52:21 +1000 | [diff] [blame] | 75 | phys_addr_t lowmem_end_addr; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 76 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 77 | int boot_mapsize; |
| 78 | #ifdef CONFIG_PPC_PMAC |
| 79 | unsigned long agp_special_page; |
Paul Mackerras | 5c8c56e | 2005-10-22 14:42:51 +1000 | [diff] [blame] | 80 | EXPORT_SYMBOL(agp_special_page); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 81 | #endif |
| 82 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 83 | void MMU_init(void); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 84 | |
| 85 | /* XXX should be in current.h -- paulus */ |
| 86 | extern struct task_struct *current_set[NR_CPUS]; |
| 87 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 88 | /* |
| 89 | * this tells the system to map all of ram with the segregs |
| 90 | * (i.e. page tables) instead of the bats. |
| 91 | * -- Cort |
| 92 | */ |
| 93 | int __map_without_bats; |
| 94 | int __map_without_ltlbs; |
| 95 | |
Albert Herranz | c5df7f7 | 2009-12-12 06:31:54 +0000 | [diff] [blame] | 96 | /* |
| 97 | * This tells the system to allow ioremapping memory marked as reserved. |
| 98 | */ |
| 99 | int __allow_ioremap_reserved; |
| 100 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 101 | /* max amount of low RAM to map in */ |
| 102 | unsigned long __max_low_memory = MAX_LOW_MEM; |
| 103 | |
| 104 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 105 | * Check for command-line options that affect what MMU_init will do. |
| 106 | */ |
| 107 | void MMU_setup(void) |
| 108 | { |
| 109 | /* Check for nobats option (used in mapin_ram). */ |
| 110 | if (strstr(cmd_line, "nobats")) { |
| 111 | __map_without_bats = 1; |
| 112 | } |
| 113 | |
| 114 | if (strstr(cmd_line, "noltlbs")) { |
| 115 | __map_without_ltlbs = 1; |
| 116 | } |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 117 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 118 | __map_without_bats = 1; |
| 119 | __map_without_ltlbs = 1; |
| 120 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 121 | } |
| 122 | |
| 123 | /* |
| 124 | * MMU_init sets up the basic memory mappings for the kernel, |
| 125 | * including both RAM and possibly some I/O regions, |
| 126 | * and sets up the page tables and the MMU hardware ready to go. |
| 127 | */ |
| 128 | void __init MMU_init(void) |
| 129 | { |
| 130 | if (ppc_md.progress) |
| 131 | ppc_md.progress("MMU:enter", 0x111); |
| 132 | |
| 133 | /* parse args from command line */ |
| 134 | MMU_setup(); |
| 135 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 136 | /* |
| 137 | * Reserve gigantic pages for hugetlb. This MUST occur before |
| 138 | * lowmem_end_addr is initialized below. |
| 139 | */ |
| 140 | reserve_hugetlb_gpages(); |
| 141 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 142 | if (memblock.memory.cnt > 1) { |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 143 | #ifndef CONFIG_WII |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 144 | memblock.memory.cnt = 1; |
| 145 | memblock_analyze(); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 146 | printk(KERN_WARNING "Only using first contiguous memory region"); |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 147 | #else |
| 148 | wii_memory_fixups(); |
| 149 | #endif |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 150 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 151 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 152 | total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 153 | lowmem_end_addr = memstart_addr + total_lowmem; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 154 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 155 | #ifdef CONFIG_FSL_BOOKE |
| 156 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB |
| 157 | * entries, so we need to adjust lowmem to match the amount we can map |
| 158 | * in the fixed entries */ |
| 159 | adjust_total_lowmem(); |
| 160 | #endif /* CONFIG_FSL_BOOKE */ |
Paul Mackerras | fa39dc4 | 2005-10-26 21:54:21 +1000 | [diff] [blame] | 161 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 162 | if (total_lowmem > __max_low_memory) { |
| 163 | total_lowmem = __max_low_memory; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 164 | lowmem_end_addr = memstart_addr + total_lowmem; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 165 | #ifndef CONFIG_HIGHMEM |
| 166 | total_memory = total_lowmem; |
Scott Wood | 6dd2270 | 2011-01-27 10:30:44 +0000 | [diff] [blame] | 167 | memblock_enforce_memory_limit(total_lowmem); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 168 | memblock_analyze(); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 169 | #endif /* CONFIG_HIGHMEM */ |
| 170 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 171 | |
| 172 | /* Initialize the MMU hardware */ |
| 173 | if (ppc_md.progress) |
| 174 | ppc_md.progress("MMU:hw init", 0x300); |
| 175 | MMU_init_hw(); |
| 176 | |
| 177 | /* Map in all of RAM starting at KERNELBASE */ |
| 178 | if (ppc_md.progress) |
| 179 | ppc_md.progress("MMU:mapin", 0x301); |
| 180 | mapin_ram(); |
| 181 | |
Benjamin Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 182 | /* Initialize early top-down ioremap allocator */ |
| 183 | ioremap_bot = IOREMAP_TOP; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 184 | |
| 185 | /* Map in I/O resources */ |
| 186 | if (ppc_md.progress) |
| 187 | ppc_md.progress("MMU:setio", 0x302); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 188 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 189 | if (ppc_md.progress) |
| 190 | ppc_md.progress("MMU:exit", 0x211); |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 191 | |
| 192 | /* From now on, btext is no longer BAT mapped if it was at all */ |
| 193 | #ifdef CONFIG_BOOTX_TEXT |
| 194 | btext_unmap(); |
| 195 | #endif |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 196 | |
| 197 | /* Shortly after that, the entire linear mapping will be available */ |
| 198 | memblock_set_current_limit(lowmem_end_addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | /* This is only called until mem_init is done. */ |
| 202 | void __init *early_get_page(void) |
| 203 | { |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 204 | if (init_bootmem_done) |
| 205 | return alloc_bootmem_pages(PAGE_SIZE); |
| 206 | else |
| 207 | return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 208 | } |
| 209 | |
Benjamin Herrenschmidt | cd3db0c | 2010-07-06 15:39:02 -0700 | [diff] [blame] | 210 | #ifdef CONFIG_8xx /* No 8xx specific .c file to put that in ... */ |
| 211 | void setup_initial_memory_limit(phys_addr_t first_memblock_base, |
| 212 | phys_addr_t first_memblock_size) |
| 213 | { |
| 214 | /* We don't currently support the first MEMBLOCK not mapping 0 |
| 215 | * physical on those processors |
| 216 | */ |
| 217 | BUG_ON(first_memblock_base != 0); |
| 218 | |
| 219 | /* 8xx can only access 8MB at the moment */ |
| 220 | memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000)); |
| 221 | } |
| 222 | #endif /* CONFIG_8xx */ |