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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> | |
29 | #include <linux/bootmem.h> | |
30 | #include <linux/highmem.h> | |
31 | #include <linux/initrd.h> | |
32 | #include <linux/pagemap.h> | |
95f72d1e | 33 | #include <linux/memblock.h> |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
41151e77 BB |
35 | #include <linux/slab.h> |
36 | #include <linux/hugetlb.h> | |
14cf11af PM |
37 | |
38 | #include <asm/pgalloc.h> | |
39 | #include <asm/prom.h> | |
40 | #include <asm/io.h> | |
14cf11af PM |
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> | |
7c8c6b97 | 47 | #include <asm/sections.h> |
5f25f065 | 48 | #include <asm/system.h> |
41151e77 | 49 | #include <asm/hugetlb.h> |
14cf11af | 50 | |
14cf11af PM |
51 | #include "mmu_decl.h" |
52 | ||
53 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) | |
9ddc5b6f | 54 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
ccdcef72 | 55 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
14cf11af PM |
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 | ||
2bf3016f SR |
61 | phys_addr_t total_memory; |
62 | phys_addr_t total_lowmem; | |
14cf11af | 63 | |
37dd2bad KG |
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); | |
99c62dd7 | 68 | phys_addr_t lowmem_end_addr; |
14cf11af | 69 | |
14cf11af PM |
70 | int boot_mapsize; |
71 | #ifdef CONFIG_PPC_PMAC | |
72 | unsigned long agp_special_page; | |
5c8c56eb | 73 | EXPORT_SYMBOL(agp_special_page); |
14cf11af PM |
74 | #endif |
75 | ||
14cf11af | 76 | void MMU_init(void); |
14cf11af PM |
77 | |
78 | /* XXX should be in current.h -- paulus */ | |
79 | extern struct task_struct *current_set[NR_CPUS]; | |
80 | ||
14cf11af PM |
81 | /* |
82 | * this tells the system to map all of ram with the segregs | |
83 | * (i.e. page tables) instead of the bats. | |
84 | * -- Cort | |
85 | */ | |
86 | int __map_without_bats; | |
87 | int __map_without_ltlbs; | |
88 | ||
c5df7f77 AH |
89 | /* |
90 | * This tells the system to allow ioremapping memory marked as reserved. | |
91 | */ | |
92 | int __allow_ioremap_reserved; | |
93 | ||
14cf11af PM |
94 | /* max amount of low RAM to map in */ |
95 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
96 | ||
14cf11af PM |
97 | /* |
98 | * Check for command-line options that affect what MMU_init will do. | |
99 | */ | |
100 | void MMU_setup(void) | |
101 | { | |
102 | /* Check for nobats option (used in mapin_ram). */ | |
103 | if (strstr(cmd_line, "nobats")) { | |
104 | __map_without_bats = 1; | |
105 | } | |
106 | ||
107 | if (strstr(cmd_line, "noltlbs")) { | |
108 | __map_without_ltlbs = 1; | |
109 | } | |
88df6e90 BH |
110 | #ifdef CONFIG_DEBUG_PAGEALLOC |
111 | __map_without_bats = 1; | |
112 | __map_without_ltlbs = 1; | |
113 | #endif | |
14cf11af PM |
114 | } |
115 | ||
116 | /* | |
117 | * MMU_init sets up the basic memory mappings for the kernel, | |
118 | * including both RAM and possibly some I/O regions, | |
119 | * and sets up the page tables and the MMU hardware ready to go. | |
120 | */ | |
121 | void __init MMU_init(void) | |
122 | { | |
123 | if (ppc_md.progress) | |
124 | ppc_md.progress("MMU:enter", 0x111); | |
125 | ||
126 | /* parse args from command line */ | |
127 | MMU_setup(); | |
128 | ||
41151e77 BB |
129 | /* |
130 | * Reserve gigantic pages for hugetlb. This MUST occur before | |
131 | * lowmem_end_addr is initialized below. | |
132 | */ | |
133 | reserve_hugetlb_gpages(); | |
134 | ||
95f72d1e | 135 | if (memblock.memory.cnt > 1) { |
de32400d | 136 | #ifndef CONFIG_WII |
95f72d1e YL |
137 | memblock.memory.cnt = 1; |
138 | memblock_analyze(); | |
7c8c6b97 | 139 | printk(KERN_WARNING "Only using first contiguous memory region"); |
de32400d AH |
140 | #else |
141 | wii_memory_fixups(); | |
142 | #endif | |
7c8c6b97 PM |
143 | } |
144 | ||
95f72d1e | 145 | total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; |
d7917ba7 | 146 | lowmem_end_addr = memstart_addr + total_lowmem; |
7c8c6b97 | 147 | |
14cf11af PM |
148 | #ifdef CONFIG_FSL_BOOKE |
149 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB | |
150 | * entries, so we need to adjust lowmem to match the amount we can map | |
151 | * in the fixed entries */ | |
152 | adjust_total_lowmem(); | |
153 | #endif /* CONFIG_FSL_BOOKE */ | |
fa39dc43 | 154 | |
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155 | if (total_lowmem > __max_low_memory) { |
156 | total_lowmem = __max_low_memory; | |
d7917ba7 | 157 | lowmem_end_addr = memstart_addr + total_lowmem; |
14cf11af PM |
158 | #ifndef CONFIG_HIGHMEM |
159 | total_memory = total_lowmem; | |
6dd22700 | 160 | memblock_enforce_memory_limit(total_lowmem); |
95f72d1e | 161 | memblock_analyze(); |
14cf11af PM |
162 | #endif /* CONFIG_HIGHMEM */ |
163 | } | |
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164 | |
165 | /* Initialize the MMU hardware */ | |
166 | if (ppc_md.progress) | |
167 | ppc_md.progress("MMU:hw init", 0x300); | |
168 | MMU_init_hw(); | |
169 | ||
170 | /* Map in all of RAM starting at KERNELBASE */ | |
171 | if (ppc_md.progress) | |
172 | ppc_md.progress("MMU:mapin", 0x301); | |
173 | mapin_ram(); | |
174 | ||
f637a49e BH |
175 | /* Initialize early top-down ioremap allocator */ |
176 | ioremap_bot = IOREMAP_TOP; | |
14cf11af PM |
177 | |
178 | /* Map in I/O resources */ | |
179 | if (ppc_md.progress) | |
180 | ppc_md.progress("MMU:setio", 0x302); | |
14cf11af | 181 | |
14cf11af PM |
182 | if (ppc_md.progress) |
183 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
184 | |
185 | /* From now on, btext is no longer BAT mapped if it was at all */ | |
186 | #ifdef CONFIG_BOOTX_TEXT | |
187 | btext_unmap(); | |
188 | #endif | |
e63075a3 BH |
189 | |
190 | /* Shortly after that, the entire linear mapping will be available */ | |
191 | memblock_set_current_limit(lowmem_end_addr); | |
14cf11af PM |
192 | } |
193 | ||
194 | /* This is only called until mem_init is done. */ | |
195 | void __init *early_get_page(void) | |
196 | { | |
e63075a3 BH |
197 | if (init_bootmem_done) |
198 | return alloc_bootmem_pages(PAGE_SIZE); | |
199 | else | |
200 | return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); | |
14cf11af PM |
201 | } |
202 | ||
cd3db0c4 BH |
203 | #ifdef CONFIG_8xx /* No 8xx specific .c file to put that in ... */ |
204 | void setup_initial_memory_limit(phys_addr_t first_memblock_base, | |
205 | phys_addr_t first_memblock_size) | |
206 | { | |
207 | /* We don't currently support the first MEMBLOCK not mapping 0 | |
208 | * physical on those processors | |
209 | */ | |
210 | BUG_ON(first_memblock_base != 0); | |
211 | ||
212 | /* 8xx can only access 8MB at the moment */ | |
213 | memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000)); | |
214 | } | |
215 | #endif /* CONFIG_8xx */ |