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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> | |
d9b2b2a2 | 33 | #include <linux/lmb.h> |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
14cf11af PM |
35 | |
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/prom.h> | |
38 | #include <asm/io.h> | |
14cf11af PM |
39 | #include <asm/pgtable.h> |
40 | #include <asm/mmu.h> | |
41 | #include <asm/smp.h> | |
42 | #include <asm/machdep.h> | |
43 | #include <asm/btext.h> | |
44 | #include <asm/tlb.h> | |
7c8c6b97 | 45 | #include <asm/sections.h> |
5f25f065 | 46 | #include <asm/system.h> |
14cf11af | 47 | |
14cf11af PM |
48 | #include "mmu_decl.h" |
49 | ||
50 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) | |
9ddc5b6f | 51 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
ccdcef72 | 52 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
14cf11af PM |
53 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL" |
54 | #endif | |
55 | #endif | |
56 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE | |
57 | ||
2bf3016f SR |
58 | phys_addr_t total_memory; |
59 | phys_addr_t total_lowmem; | |
14cf11af | 60 | |
37dd2bad KG |
61 | phys_addr_t memstart_addr = (phys_addr_t)~0ull; |
62 | EXPORT_SYMBOL(memstart_addr); | |
63 | phys_addr_t kernstart_addr; | |
64 | EXPORT_SYMBOL(kernstart_addr); | |
99c62dd7 | 65 | phys_addr_t lowmem_end_addr; |
14cf11af | 66 | |
14cf11af PM |
67 | int boot_mapsize; |
68 | #ifdef CONFIG_PPC_PMAC | |
69 | unsigned long agp_special_page; | |
5c8c56eb | 70 | EXPORT_SYMBOL(agp_special_page); |
14cf11af PM |
71 | #endif |
72 | ||
14cf11af | 73 | void MMU_init(void); |
14cf11af PM |
74 | |
75 | /* XXX should be in current.h -- paulus */ | |
76 | extern struct task_struct *current_set[NR_CPUS]; | |
77 | ||
14cf11af PM |
78 | /* |
79 | * this tells the system to map all of ram with the segregs | |
80 | * (i.e. page tables) instead of the bats. | |
81 | * -- Cort | |
82 | */ | |
83 | int __map_without_bats; | |
84 | int __map_without_ltlbs; | |
85 | ||
c5df7f77 AH |
86 | /* |
87 | * This tells the system to allow ioremapping memory marked as reserved. | |
88 | */ | |
89 | int __allow_ioremap_reserved; | |
90 | ||
14cf11af PM |
91 | /* max amount of low RAM to map in */ |
92 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
93 | ||
94 | /* | |
09b5e63f | 95 | * address of the limit of what is accessible with initial MMU setup - |
7c8c6b97 | 96 | * 256MB usually, but only 16MB on 601. |
14cf11af | 97 | */ |
09b5e63f | 98 | phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000; |
14cf11af PM |
99 | |
100 | /* | |
101 | * Check for command-line options that affect what MMU_init will do. | |
102 | */ | |
103 | void MMU_setup(void) | |
104 | { | |
105 | /* Check for nobats option (used in mapin_ram). */ | |
106 | if (strstr(cmd_line, "nobats")) { | |
107 | __map_without_bats = 1; | |
108 | } | |
109 | ||
110 | if (strstr(cmd_line, "noltlbs")) { | |
111 | __map_without_ltlbs = 1; | |
112 | } | |
88df6e90 BH |
113 | #ifdef CONFIG_DEBUG_PAGEALLOC |
114 | __map_without_bats = 1; | |
115 | __map_without_ltlbs = 1; | |
116 | #endif | |
14cf11af PM |
117 | } |
118 | ||
119 | /* | |
120 | * MMU_init sets up the basic memory mappings for the kernel, | |
121 | * including both RAM and possibly some I/O regions, | |
122 | * and sets up the page tables and the MMU hardware ready to go. | |
123 | */ | |
124 | void __init MMU_init(void) | |
125 | { | |
126 | if (ppc_md.progress) | |
127 | ppc_md.progress("MMU:enter", 0x111); | |
128 | ||
7c8c6b97 PM |
129 | /* 601 can only access 16MB at the moment */ |
130 | if (PVR_VER(mfspr(SPRN_PVR)) == 1) | |
09b5e63f | 131 | __initial_memory_limit_addr = 0x01000000; |
544cdabe JT |
132 | /* 8xx can only access 8MB at the moment */ |
133 | if (PVR_VER(mfspr(SPRN_PVR)) == 0x50) | |
09b5e63f | 134 | __initial_memory_limit_addr = 0x00800000; |
7c8c6b97 | 135 | |
14cf11af PM |
136 | /* parse args from command line */ |
137 | MMU_setup(); | |
138 | ||
7c8c6b97 | 139 | if (lmb.memory.cnt > 1) { |
de32400d | 140 | #ifndef CONFIG_WII |
7c8c6b97 PM |
141 | lmb.memory.cnt = 1; |
142 | lmb_analyze(); | |
143 | printk(KERN_WARNING "Only using first contiguous memory region"); | |
de32400d AH |
144 | #else |
145 | wii_memory_fixups(); | |
146 | #endif | |
7c8c6b97 PM |
147 | } |
148 | ||
99c62dd7 | 149 | total_lowmem = total_memory = lmb_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 | |
14cf11af PM |
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; | |
d7917ba7 | 164 | lmb_enforce_memory_limit(lowmem_end_addr); |
fa39dc43 | 165 | lmb_analyze(); |
14cf11af PM |
166 | #endif /* CONFIG_HIGHMEM */ |
167 | } | |
14cf11af PM |
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 | ||
f637a49e BH |
179 | /* Initialize early top-down ioremap allocator */ |
180 | ioremap_bot = IOREMAP_TOP; | |
14cf11af PM |
181 | |
182 | /* Map in I/O resources */ | |
183 | if (ppc_md.progress) | |
184 | ppc_md.progress("MMU:setio", 0x302); | |
14cf11af | 185 | |
14cf11af PM |
186 | if (ppc_md.progress) |
187 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
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 | |
14cf11af PM |
193 | } |
194 | ||
195 | /* This is only called until mem_init is done. */ | |
196 | void __init *early_get_page(void) | |
197 | { | |
198 | void *p; | |
199 | ||
200 | if (init_bootmem_done) { | |
201 | p = alloc_bootmem_pages(PAGE_SIZE); | |
202 | } else { | |
7c8c6b97 | 203 | p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, |
09b5e63f | 204 | __initial_memory_limit_addr)); |
14cf11af PM |
205 | } |
206 | return p; | |
207 | } | |
208 | ||
209 | /* Free up now-unused memory */ | |
210 | static void free_sec(unsigned long start, unsigned long end, const char *name) | |
211 | { | |
212 | unsigned long cnt = 0; | |
213 | ||
214 | while (start < end) { | |
215 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 216 | init_page_count(virt_to_page(start)); |
14cf11af PM |
217 | free_page(start); |
218 | cnt++; | |
219 | start += PAGE_SIZE; | |
220 | } | |
221 | if (cnt) { | |
222 | printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name); | |
223 | totalram_pages += cnt; | |
224 | } | |
225 | } | |
226 | ||
227 | void free_initmem(void) | |
228 | { | |
229 | #define FREESEC(TYPE) \ | |
230 | free_sec((unsigned long)(&__ ## TYPE ## _begin), \ | |
231 | (unsigned long)(&__ ## TYPE ## _end), \ | |
232 | #TYPE); | |
233 | ||
234 | printk ("Freeing unused kernel memory:"); | |
235 | FREESEC(init); | |
236 | printk("\n"); | |
237 | ppc_md.progress = NULL; | |
238 | #undef FREESEC | |
239 | } | |
240 | ||
241 | #ifdef CONFIG_BLK_DEV_INITRD | |
242 | void free_initrd_mem(unsigned long start, unsigned long end) | |
243 | { | |
244 | if (start < end) | |
245 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
246 | for (; start < end; start += PAGE_SIZE) { | |
247 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 248 | init_page_count(virt_to_page(start)); |
14cf11af PM |
249 | free_page(start); |
250 | totalram_pages++; | |
251 | } | |
252 | } | |
253 | #endif | |
df174e3b | 254 |