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> |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 48 | #include <asm/hugetlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 49 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | #include "mmu_decl.h" |
| 51 | |
| 52 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) |
Uwe Kleine-König | 9ddc5b6 | 2010-01-20 17:02:24 +0100 | [diff] [blame] | 53 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
Dale Farnsworth | ccdcef7 | 2008-12-17 10:09:13 +0000 | [diff] [blame] | 54 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
Paul Bolle | b615f4b | 2013-05-29 09:55:47 +0200 | [diff] [blame^] | 55 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 56 | #endif |
| 57 | #endif |
| 58 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE |
| 59 | |
Stefan Roese | 2bf3016 | 2008-07-10 01:09:23 +1000 | [diff] [blame] | 60 | phys_addr_t total_memory; |
| 61 | phys_addr_t total_lowmem; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 62 | |
Kumar Gala | 37dd2ba | 2008-04-22 04:22:34 +1000 | [diff] [blame] | 63 | phys_addr_t memstart_addr = (phys_addr_t)~0ull; |
| 64 | EXPORT_SYMBOL(memstart_addr); |
| 65 | phys_addr_t kernstart_addr; |
| 66 | EXPORT_SYMBOL(kernstart_addr); |
Suzuki Poulose | 368ff8f | 2011-12-14 22:58:37 +0000 | [diff] [blame] | 67 | |
| 68 | #ifdef CONFIG_RELOCATABLE_PPC32 |
| 69 | /* Used in __va()/__pa() */ |
| 70 | long long virt_phys_offset; |
| 71 | EXPORT_SYMBOL(virt_phys_offset); |
| 72 | #endif |
| 73 | |
Kumar Gala | 99c62dd7 | 2008-04-16 05:52:21 +1000 | [diff] [blame] | 74 | phys_addr_t lowmem_end_addr; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 75 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 76 | int boot_mapsize; |
| 77 | #ifdef CONFIG_PPC_PMAC |
| 78 | unsigned long agp_special_page; |
Paul Mackerras | 5c8c56e | 2005-10-22 14:42:51 +1000 | [diff] [blame] | 79 | EXPORT_SYMBOL(agp_special_page); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 80 | #endif |
| 81 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 82 | void MMU_init(void); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 83 | |
| 84 | /* XXX should be in current.h -- paulus */ |
| 85 | extern struct task_struct *current_set[NR_CPUS]; |
| 86 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 87 | /* |
| 88 | * this tells the system to map all of ram with the segregs |
| 89 | * (i.e. page tables) instead of the bats. |
| 90 | * -- Cort |
| 91 | */ |
| 92 | int __map_without_bats; |
| 93 | int __map_without_ltlbs; |
| 94 | |
Albert Herranz | c5df7f7 | 2009-12-12 06:31:54 +0000 | [diff] [blame] | 95 | /* |
| 96 | * This tells the system to allow ioremapping memory marked as reserved. |
| 97 | */ |
| 98 | int __allow_ioremap_reserved; |
| 99 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 100 | /* max amount of low RAM to map in */ |
| 101 | unsigned long __max_low_memory = MAX_LOW_MEM; |
| 102 | |
| 103 | /* |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 104 | * Check for command-line options that affect what MMU_init will do. |
| 105 | */ |
| 106 | void MMU_setup(void) |
| 107 | { |
| 108 | /* Check for nobats option (used in mapin_ram). */ |
| 109 | if (strstr(cmd_line, "nobats")) { |
| 110 | __map_without_bats = 1; |
| 111 | } |
| 112 | |
| 113 | if (strstr(cmd_line, "noltlbs")) { |
| 114 | __map_without_ltlbs = 1; |
| 115 | } |
Benjamin Herrenschmidt | 88df6e9 | 2007-04-12 15:30:22 +1000 | [diff] [blame] | 116 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 117 | __map_without_bats = 1; |
| 118 | __map_without_ltlbs = 1; |
| 119 | #endif |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | /* |
| 123 | * MMU_init sets up the basic memory mappings for the kernel, |
| 124 | * including both RAM and possibly some I/O regions, |
| 125 | * and sets up the page tables and the MMU hardware ready to go. |
| 126 | */ |
| 127 | void __init MMU_init(void) |
| 128 | { |
| 129 | if (ppc_md.progress) |
| 130 | ppc_md.progress("MMU:enter", 0x111); |
| 131 | |
| 132 | /* parse args from command line */ |
| 133 | MMU_setup(); |
| 134 | |
Becky Bruce | 41151e7 | 2011-06-28 09:54:48 +0000 | [diff] [blame] | 135 | /* |
| 136 | * Reserve gigantic pages for hugetlb. This MUST occur before |
| 137 | * lowmem_end_addr is initialized below. |
| 138 | */ |
| 139 | reserve_hugetlb_gpages(); |
| 140 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 141 | if (memblock.memory.cnt > 1) { |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 142 | #ifndef CONFIG_WII |
Tejun Heo | 6fbef13 | 2011-12-08 10:22:07 -0800 | [diff] [blame] | 143 | memblock_enforce_memory_limit(memblock.memory.regions[0].size); |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 144 | printk(KERN_WARNING "Only using first contiguous memory region"); |
Albert Herranz | de32400 | 2009-12-12 06:31:53 +0000 | [diff] [blame] | 145 | #else |
| 146 | wii_memory_fixups(); |
| 147 | #endif |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 148 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 149 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 150 | total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 151 | lowmem_end_addr = memstart_addr + total_lowmem; |
Paul Mackerras | 7c8c6b9 | 2005-10-06 12:23:33 +1000 | [diff] [blame] | 152 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 153 | #ifdef CONFIG_FSL_BOOKE |
| 154 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB |
| 155 | * entries, so we need to adjust lowmem to match the amount we can map |
| 156 | * in the fixed entries */ |
| 157 | adjust_total_lowmem(); |
| 158 | #endif /* CONFIG_FSL_BOOKE */ |
Paul Mackerras | fa39dc4 | 2005-10-26 21:54:21 +1000 | [diff] [blame] | 159 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 160 | if (total_lowmem > __max_low_memory) { |
| 161 | total_lowmem = __max_low_memory; |
Kumar Gala | d7917ba | 2008-04-16 05:52:22 +1000 | [diff] [blame] | 162 | lowmem_end_addr = memstart_addr + total_lowmem; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 163 | #ifndef CONFIG_HIGHMEM |
| 164 | total_memory = total_lowmem; |
Scott Wood | 6dd2270 | 2011-01-27 10:30:44 +0000 | [diff] [blame] | 165 | memblock_enforce_memory_limit(total_lowmem); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 166 | #endif /* CONFIG_HIGHMEM */ |
| 167 | } |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 168 | |
| 169 | /* Initialize the MMU hardware */ |
| 170 | if (ppc_md.progress) |
| 171 | ppc_md.progress("MMU:hw init", 0x300); |
| 172 | MMU_init_hw(); |
| 173 | |
| 174 | /* Map in all of RAM starting at KERNELBASE */ |
| 175 | if (ppc_md.progress) |
| 176 | ppc_md.progress("MMU:mapin", 0x301); |
| 177 | mapin_ram(); |
| 178 | |
Benjamin Herrenschmidt | f637a49 | 2009-05-27 13:44:50 +1000 | [diff] [blame] | 179 | /* Initialize early top-down ioremap allocator */ |
| 180 | ioremap_bot = IOREMAP_TOP; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 181 | |
| 182 | /* Map in I/O resources */ |
| 183 | if (ppc_md.progress) |
| 184 | ppc_md.progress("MMU:setio", 0x302); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 185 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 186 | if (ppc_md.progress) |
| 187 | ppc_md.progress("MMU:exit", 0x211); |
Benjamin Herrenschmidt | 51d3082 | 2005-11-23 17:57:25 +1100 | [diff] [blame] | 188 | |
| 189 | /* From now on, btext is no longer BAT mapped if it was at all */ |
| 190 | #ifdef CONFIG_BOOTX_TEXT |
| 191 | btext_unmap(); |
| 192 | #endif |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 193 | |
| 194 | /* Shortly after that, the entire linear mapping will be available */ |
| 195 | memblock_set_current_limit(lowmem_end_addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | /* This is only called until mem_init is done. */ |
| 199 | void __init *early_get_page(void) |
| 200 | { |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 201 | if (init_bootmem_done) |
| 202 | return alloc_bootmem_pages(PAGE_SIZE); |
| 203 | else |
| 204 | return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 205 | } |
| 206 | |
Benjamin Herrenschmidt | cd3db0c | 2010-07-06 15:39:02 -0700 | [diff] [blame] | 207 | #ifdef CONFIG_8xx /* No 8xx specific .c file to put that in ... */ |
| 208 | void setup_initial_memory_limit(phys_addr_t first_memblock_base, |
| 209 | phys_addr_t first_memblock_size) |
| 210 | { |
| 211 | /* We don't currently support the first MEMBLOCK not mapping 0 |
| 212 | * physical on those processors |
| 213 | */ |
| 214 | BUG_ON(first_memblock_base != 0); |
| 215 | |
| 216 | /* 8xx can only access 8MB at the moment */ |
| 217 | memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000)); |
| 218 | } |
| 219 | #endif /* CONFIG_8xx */ |