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14cf11af PM |
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 | |
14cf11af PM |
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 | ||
14cf11af PM |
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> | |
14cf11af PM |
29 | #include <linux/highmem.h> |
30 | #include <linux/initrd.h> | |
31 | #include <linux/pagemap.h> | |
95f72d1e | 32 | #include <linux/memblock.h> |
5a0e3ad6 | 33 | #include <linux/gfp.h> |
41151e77 BB |
34 | #include <linux/slab.h> |
35 | #include <linux/hugetlb.h> | |
14cf11af PM |
36 | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/prom.h> | |
39 | #include <asm/io.h> | |
14cf11af PM |
40 | #include <asm/pgtable.h> |
41 | #include <asm/mmu.h> | |
42 | #include <asm/smp.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/btext.h> | |
45 | #include <asm/tlb.h> | |
7c8c6b97 | 46 | #include <asm/sections.h> |
41151e77 | 47 | #include <asm/hugetlb.h> |
14cf11af | 48 | |
14cf11af PM |
49 | #include "mmu_decl.h" |
50 | ||
51 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) | |
9ddc5b6f | 52 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
ccdcef72 | 53 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
b615f4b3 | 54 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" |
14cf11af PM |
55 | #endif |
56 | #endif | |
57 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE | |
58 | ||
2bf3016f SR |
59 | phys_addr_t total_memory; |
60 | phys_addr_t total_lowmem; | |
14cf11af | 61 | |
37dd2bad KG |
62 | phys_addr_t memstart_addr = (phys_addr_t)~0ull; |
63 | EXPORT_SYMBOL(memstart_addr); | |
64 | phys_addr_t kernstart_addr; | |
65 | EXPORT_SYMBOL(kernstart_addr); | |
368ff8f1 SP |
66 | |
67 | #ifdef CONFIG_RELOCATABLE_PPC32 | |
68 | /* Used in __va()/__pa() */ | |
69 | long long virt_phys_offset; | |
70 | EXPORT_SYMBOL(virt_phys_offset); | |
71 | #endif | |
72 | ||
99c62dd7 | 73 | phys_addr_t lowmem_end_addr; |
14cf11af | 74 | |
14cf11af PM |
75 | int boot_mapsize; |
76 | #ifdef CONFIG_PPC_PMAC | |
77 | unsigned long agp_special_page; | |
5c8c56eb | 78 | EXPORT_SYMBOL(agp_special_page); |
14cf11af PM |
79 | #endif |
80 | ||
14cf11af | 81 | void MMU_init(void); |
14cf11af PM |
82 | |
83 | /* XXX should be in current.h -- paulus */ | |
84 | extern struct task_struct *current_set[NR_CPUS]; | |
85 | ||
14cf11af PM |
86 | /* |
87 | * this tells the system to map all of ram with the segregs | |
88 | * (i.e. page tables) instead of the bats. | |
89 | * -- Cort | |
90 | */ | |
91 | int __map_without_bats; | |
92 | int __map_without_ltlbs; | |
93 | ||
c5df7f77 AH |
94 | /* |
95 | * This tells the system to allow ioremapping memory marked as reserved. | |
96 | */ | |
97 | int __allow_ioremap_reserved; | |
98 | ||
14cf11af PM |
99 | /* max amount of low RAM to map in */ |
100 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
101 | ||
14cf11af PM |
102 | /* |
103 | * Check for command-line options that affect what MMU_init will do. | |
104 | */ | |
94966b71 | 105 | void __init MMU_setup(void) |
14cf11af PM |
106 | { |
107 | /* Check for nobats option (used in mapin_ram). */ | |
3e47d147 | 108 | if (strstr(boot_command_line, "nobats")) { |
14cf11af PM |
109 | __map_without_bats = 1; |
110 | } | |
111 | ||
3e47d147 | 112 | if (strstr(boot_command_line, "noltlbs")) { |
14cf11af PM |
113 | __map_without_ltlbs = 1; |
114 | } | |
e7df0d88 JK |
115 | if (debug_pagealloc_enabled()) { |
116 | __map_without_bats = 1; | |
117 | __map_without_ltlbs = 1; | |
118 | } | |
14cf11af PM |
119 | } |
120 | ||
121 | /* | |
122 | * MMU_init sets up the basic memory mappings for the kernel, | |
123 | * including both RAM and possibly some I/O regions, | |
124 | * and sets up the page tables and the MMU hardware ready to go. | |
125 | */ | |
126 | void __init MMU_init(void) | |
127 | { | |
128 | if (ppc_md.progress) | |
129 | ppc_md.progress("MMU:enter", 0x111); | |
130 | ||
131 | /* parse args from command line */ | |
132 | MMU_setup(); | |
133 | ||
41151e77 BB |
134 | /* |
135 | * Reserve gigantic pages for hugetlb. This MUST occur before | |
136 | * lowmem_end_addr is initialized below. | |
137 | */ | |
138 | reserve_hugetlb_gpages(); | |
139 | ||
95f72d1e | 140 | if (memblock.memory.cnt > 1) { |
de32400d | 141 | #ifndef CONFIG_WII |
6fbef13c | 142 | memblock_enforce_memory_limit(memblock.memory.regions[0].size); |
7c8c6b97 | 143 | printk(KERN_WARNING "Only using first contiguous memory region"); |
de32400d AH |
144 | #else |
145 | wii_memory_fixups(); | |
146 | #endif | |
7c8c6b97 PM |
147 | } |
148 | ||
95f72d1e | 149 | total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; |
d7917ba7 | 150 | lowmem_end_addr = memstart_addr + total_lowmem; |
7c8c6b97 | 151 | |
14cf11af PM |
152 | #ifdef CONFIG_FSL_BOOKE |
153 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB | |
154 | * entries, so we need to adjust lowmem to match the amount we can map | |
155 | * in the fixed entries */ | |
156 | adjust_total_lowmem(); | |
157 | #endif /* CONFIG_FSL_BOOKE */ | |
fa39dc43 | 158 | |
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159 | if (total_lowmem > __max_low_memory) { |
160 | total_lowmem = __max_low_memory; | |
d7917ba7 | 161 | lowmem_end_addr = memstart_addr + total_lowmem; |
14cf11af PM |
162 | #ifndef CONFIG_HIGHMEM |
163 | total_memory = total_lowmem; | |
6dd22700 | 164 | memblock_enforce_memory_limit(total_lowmem); |
14cf11af PM |
165 | #endif /* CONFIG_HIGHMEM */ |
166 | } | |
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167 | |
168 | /* Initialize the MMU hardware */ | |
169 | if (ppc_md.progress) | |
170 | ppc_md.progress("MMU:hw init", 0x300); | |
171 | MMU_init_hw(); | |
172 | ||
173 | /* Map in all of RAM starting at KERNELBASE */ | |
174 | if (ppc_md.progress) | |
175 | ppc_md.progress("MMU:mapin", 0x301); | |
176 | mapin_ram(); | |
177 | ||
f637a49e BH |
178 | /* Initialize early top-down ioremap allocator */ |
179 | ioremap_bot = IOREMAP_TOP; | |
14cf11af | 180 | |
14cf11af PM |
181 | if (ppc_md.progress) |
182 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
183 | |
184 | /* From now on, btext is no longer BAT mapped if it was at all */ | |
185 | #ifdef CONFIG_BOOTX_TEXT | |
186 | btext_unmap(); | |
187 | #endif | |
e63075a3 BH |
188 | |
189 | /* Shortly after that, the entire linear mapping will be available */ | |
190 | memblock_set_current_limit(lowmem_end_addr); | |
14cf11af | 191 | } |