Commit | Line | Data |
---|---|---|
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> |
14cf11af PM |
34 | |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/prom.h> | |
37 | #include <asm/io.h> | |
14cf11af PM |
38 | #include <asm/pgtable.h> |
39 | #include <asm/mmu.h> | |
40 | #include <asm/smp.h> | |
41 | #include <asm/machdep.h> | |
42 | #include <asm/btext.h> | |
43 | #include <asm/tlb.h> | |
7c8c6b97 | 44 | #include <asm/sections.h> |
5f25f065 | 45 | #include <asm/system.h> |
14cf11af | 46 | |
14cf11af PM |
47 | #include "mmu_decl.h" |
48 | ||
49 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) | |
9ddc5b6f | 50 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
ccdcef72 | 51 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
14cf11af PM |
52 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL" |
53 | #endif | |
54 | #endif | |
55 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE | |
56 | ||
2bf3016f SR |
57 | phys_addr_t total_memory; |
58 | phys_addr_t total_lowmem; | |
14cf11af | 59 | |
37dd2bad KG |
60 | phys_addr_t memstart_addr = (phys_addr_t)~0ull; |
61 | EXPORT_SYMBOL(memstart_addr); | |
62 | phys_addr_t kernstart_addr; | |
63 | EXPORT_SYMBOL(kernstart_addr); | |
99c62dd7 | 64 | phys_addr_t lowmem_end_addr; |
14cf11af | 65 | |
14cf11af PM |
66 | int boot_mapsize; |
67 | #ifdef CONFIG_PPC_PMAC | |
68 | unsigned long agp_special_page; | |
5c8c56eb | 69 | EXPORT_SYMBOL(agp_special_page); |
14cf11af PM |
70 | #endif |
71 | ||
14cf11af | 72 | void MMU_init(void); |
14cf11af PM |
73 | |
74 | /* XXX should be in current.h -- paulus */ | |
75 | extern struct task_struct *current_set[NR_CPUS]; | |
76 | ||
14cf11af PM |
77 | /* |
78 | * this tells the system to map all of ram with the segregs | |
79 | * (i.e. page tables) instead of the bats. | |
80 | * -- Cort | |
81 | */ | |
82 | int __map_without_bats; | |
83 | int __map_without_ltlbs; | |
84 | ||
c5df7f77 AH |
85 | /* |
86 | * This tells the system to allow ioremapping memory marked as reserved. | |
87 | */ | |
88 | int __allow_ioremap_reserved; | |
89 | ||
14cf11af PM |
90 | /* max amount of low RAM to map in */ |
91 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
92 | ||
93 | /* | |
09b5e63f | 94 | * address of the limit of what is accessible with initial MMU setup - |
7c8c6b97 | 95 | * 256MB usually, but only 16MB on 601. |
14cf11af | 96 | */ |
09b5e63f | 97 | phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000; |
14cf11af PM |
98 | |
99 | /* | |
100 | * Check for command-line options that affect what MMU_init will do. | |
101 | */ | |
102 | void MMU_setup(void) | |
103 | { | |
104 | /* Check for nobats option (used in mapin_ram). */ | |
105 | if (strstr(cmd_line, "nobats")) { | |
106 | __map_without_bats = 1; | |
107 | } | |
108 | ||
109 | if (strstr(cmd_line, "noltlbs")) { | |
110 | __map_without_ltlbs = 1; | |
111 | } | |
88df6e90 BH |
112 | #ifdef CONFIG_DEBUG_PAGEALLOC |
113 | __map_without_bats = 1; | |
114 | __map_without_ltlbs = 1; | |
115 | #endif | |
14cf11af PM |
116 | } |
117 | ||
118 | /* | |
119 | * MMU_init sets up the basic memory mappings for the kernel, | |
120 | * including both RAM and possibly some I/O regions, | |
121 | * and sets up the page tables and the MMU hardware ready to go. | |
122 | */ | |
123 | void __init MMU_init(void) | |
124 | { | |
125 | if (ppc_md.progress) | |
126 | ppc_md.progress("MMU:enter", 0x111); | |
127 | ||
7c8c6b97 PM |
128 | /* 601 can only access 16MB at the moment */ |
129 | if (PVR_VER(mfspr(SPRN_PVR)) == 1) | |
09b5e63f | 130 | __initial_memory_limit_addr = 0x01000000; |
544cdabe JT |
131 | /* 8xx can only access 8MB at the moment */ |
132 | if (PVR_VER(mfspr(SPRN_PVR)) == 0x50) | |
09b5e63f | 133 | __initial_memory_limit_addr = 0x00800000; |
7c8c6b97 | 134 | |
14cf11af PM |
135 | /* parse args from command line */ |
136 | MMU_setup(); | |
137 | ||
7c8c6b97 | 138 | if (lmb.memory.cnt > 1) { |
de32400d | 139 | #ifndef CONFIG_WII |
7c8c6b97 PM |
140 | lmb.memory.cnt = 1; |
141 | lmb_analyze(); | |
142 | printk(KERN_WARNING "Only using first contiguous memory region"); | |
de32400d AH |
143 | #else |
144 | wii_memory_fixups(); | |
145 | #endif | |
7c8c6b97 PM |
146 | } |
147 | ||
99c62dd7 | 148 | total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; |
d7917ba7 | 149 | lowmem_end_addr = memstart_addr + total_lowmem; |
7c8c6b97 | 150 | |
14cf11af PM |
151 | #ifdef CONFIG_FSL_BOOKE |
152 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB | |
153 | * entries, so we need to adjust lowmem to match the amount we can map | |
154 | * in the fixed entries */ | |
155 | adjust_total_lowmem(); | |
156 | #endif /* CONFIG_FSL_BOOKE */ | |
fa39dc43 | 157 | |
14cf11af PM |
158 | if (total_lowmem > __max_low_memory) { |
159 | total_lowmem = __max_low_memory; | |
d7917ba7 | 160 | lowmem_end_addr = memstart_addr + total_lowmem; |
14cf11af PM |
161 | #ifndef CONFIG_HIGHMEM |
162 | total_memory = total_lowmem; | |
d7917ba7 | 163 | lmb_enforce_memory_limit(lowmem_end_addr); |
fa39dc43 | 164 | lmb_analyze(); |
14cf11af PM |
165 | #endif /* CONFIG_HIGHMEM */ |
166 | } | |
14cf11af PM |
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 PM |
180 | |
181 | /* Map in I/O resources */ | |
182 | if (ppc_md.progress) | |
183 | ppc_md.progress("MMU:setio", 0x302); | |
14cf11af | 184 | |
14cf11af PM |
185 | if (ppc_md.progress) |
186 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
187 | |
188 | /* From now on, btext is no longer BAT mapped if it was at all */ | |
189 | #ifdef CONFIG_BOOTX_TEXT | |
190 | btext_unmap(); | |
191 | #endif | |
14cf11af PM |
192 | } |
193 | ||
194 | /* This is only called until mem_init is done. */ | |
195 | void __init *early_get_page(void) | |
196 | { | |
197 | void *p; | |
198 | ||
199 | if (init_bootmem_done) { | |
200 | p = alloc_bootmem_pages(PAGE_SIZE); | |
201 | } else { | |
7c8c6b97 | 202 | p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, |
09b5e63f | 203 | __initial_memory_limit_addr)); |
14cf11af PM |
204 | } |
205 | return p; | |
206 | } | |
207 | ||
208 | /* Free up now-unused memory */ | |
209 | static void free_sec(unsigned long start, unsigned long end, const char *name) | |
210 | { | |
211 | unsigned long cnt = 0; | |
212 | ||
213 | while (start < end) { | |
214 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 215 | init_page_count(virt_to_page(start)); |
14cf11af PM |
216 | free_page(start); |
217 | cnt++; | |
218 | start += PAGE_SIZE; | |
219 | } | |
220 | if (cnt) { | |
221 | printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name); | |
222 | totalram_pages += cnt; | |
223 | } | |
224 | } | |
225 | ||
226 | void free_initmem(void) | |
227 | { | |
228 | #define FREESEC(TYPE) \ | |
229 | free_sec((unsigned long)(&__ ## TYPE ## _begin), \ | |
230 | (unsigned long)(&__ ## TYPE ## _end), \ | |
231 | #TYPE); | |
232 | ||
233 | printk ("Freeing unused kernel memory:"); | |
234 | FREESEC(init); | |
235 | printk("\n"); | |
236 | ppc_md.progress = NULL; | |
237 | #undef FREESEC | |
238 | } | |
239 | ||
240 | #ifdef CONFIG_BLK_DEV_INITRD | |
241 | void free_initrd_mem(unsigned long start, unsigned long end) | |
242 | { | |
243 | if (start < end) | |
244 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
245 | for (; start < end; start += PAGE_SIZE) { | |
246 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 247 | init_page_count(virt_to_page(start)); |
14cf11af PM |
248 | free_page(start); |
249 | totalram_pages++; | |
250 | } | |
251 | } | |
252 | #endif | |
df174e3b | 253 |