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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> | |
38 | #include <asm/mmu_context.h> | |
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> |
14cf11af | 46 | |
14cf11af PM |
47 | #include "mmu_decl.h" |
48 | ||
49 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) | |
50 | /* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */ | |
51 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE)) | |
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 | ||
57 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
58 | ||
59 | unsigned long total_memory; | |
60 | unsigned long total_lowmem; | |
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); | |
99c62dd7 | 66 | phys_addr_t lowmem_end_addr; |
14cf11af | 67 | |
14cf11af PM |
68 | int boot_mapsize; |
69 | #ifdef CONFIG_PPC_PMAC | |
70 | unsigned long agp_special_page; | |
5c8c56eb | 71 | EXPORT_SYMBOL(agp_special_page); |
14cf11af PM |
72 | #endif |
73 | ||
14cf11af | 74 | void MMU_init(void); |
14cf11af PM |
75 | |
76 | /* XXX should be in current.h -- paulus */ | |
77 | extern struct task_struct *current_set[NR_CPUS]; | |
78 | ||
7c8c6b97 PM |
79 | extern int init_bootmem_done; |
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 | ||
14cf11af PM |
89 | /* max amount of low RAM to map in */ |
90 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
91 | ||
92 | /* | |
09b5e63f | 93 | * address of the limit of what is accessible with initial MMU setup - |
7c8c6b97 | 94 | * 256MB usually, but only 16MB on 601. |
14cf11af | 95 | */ |
09b5e63f | 96 | phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000; |
14cf11af PM |
97 | |
98 | /* | |
99 | * Check for command-line options that affect what MMU_init will do. | |
100 | */ | |
101 | void MMU_setup(void) | |
102 | { | |
103 | /* Check for nobats option (used in mapin_ram). */ | |
104 | if (strstr(cmd_line, "nobats")) { | |
105 | __map_without_bats = 1; | |
106 | } | |
107 | ||
108 | if (strstr(cmd_line, "noltlbs")) { | |
109 | __map_without_ltlbs = 1; | |
110 | } | |
88df6e90 BH |
111 | #ifdef CONFIG_DEBUG_PAGEALLOC |
112 | __map_without_bats = 1; | |
113 | __map_without_ltlbs = 1; | |
114 | #endif | |
14cf11af PM |
115 | } |
116 | ||
117 | /* | |
118 | * MMU_init sets up the basic memory mappings for the kernel, | |
119 | * including both RAM and possibly some I/O regions, | |
120 | * and sets up the page tables and the MMU hardware ready to go. | |
121 | */ | |
122 | void __init MMU_init(void) | |
123 | { | |
124 | if (ppc_md.progress) | |
125 | ppc_md.progress("MMU:enter", 0x111); | |
126 | ||
7c8c6b97 PM |
127 | /* 601 can only access 16MB at the moment */ |
128 | if (PVR_VER(mfspr(SPRN_PVR)) == 1) | |
09b5e63f | 129 | __initial_memory_limit_addr = 0x01000000; |
544cdabe JT |
130 | /* 8xx can only access 8MB at the moment */ |
131 | if (PVR_VER(mfspr(SPRN_PVR)) == 0x50) | |
09b5e63f | 132 | __initial_memory_limit_addr = 0x00800000; |
7c8c6b97 | 133 | |
14cf11af PM |
134 | /* parse args from command line */ |
135 | MMU_setup(); | |
136 | ||
7c8c6b97 PM |
137 | if (lmb.memory.cnt > 1) { |
138 | lmb.memory.cnt = 1; | |
139 | lmb_analyze(); | |
140 | printk(KERN_WARNING "Only using first contiguous memory region"); | |
141 | } | |
142 | ||
99c62dd7 | 143 | total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; |
d7917ba7 | 144 | lowmem_end_addr = memstart_addr + total_lowmem; |
7c8c6b97 | 145 | |
14cf11af PM |
146 | #ifdef CONFIG_FSL_BOOKE |
147 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB | |
148 | * entries, so we need to adjust lowmem to match the amount we can map | |
149 | * in the fixed entries */ | |
150 | adjust_total_lowmem(); | |
151 | #endif /* CONFIG_FSL_BOOKE */ | |
fa39dc43 | 152 | |
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153 | if (total_lowmem > __max_low_memory) { |
154 | total_lowmem = __max_low_memory; | |
d7917ba7 | 155 | lowmem_end_addr = memstart_addr + total_lowmem; |
14cf11af PM |
156 | #ifndef CONFIG_HIGHMEM |
157 | total_memory = total_lowmem; | |
d7917ba7 | 158 | lmb_enforce_memory_limit(lowmem_end_addr); |
fa39dc43 | 159 | lmb_analyze(); |
14cf11af PM |
160 | #endif /* CONFIG_HIGHMEM */ |
161 | } | |
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162 | |
163 | /* Initialize the MMU hardware */ | |
164 | if (ppc_md.progress) | |
165 | ppc_md.progress("MMU:hw init", 0x300); | |
166 | MMU_init_hw(); | |
167 | ||
168 | /* Map in all of RAM starting at KERNELBASE */ | |
169 | if (ppc_md.progress) | |
170 | ppc_md.progress("MMU:mapin", 0x301); | |
171 | mapin_ram(); | |
172 | ||
173 | #ifdef CONFIG_HIGHMEM | |
174 | ioremap_base = PKMAP_BASE; | |
175 | #else | |
176 | ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ | |
177 | #endif /* CONFIG_HIGHMEM */ | |
178 | ioremap_bot = ioremap_base; | |
179 | ||
180 | /* Map in I/O resources */ | |
181 | if (ppc_md.progress) | |
182 | ppc_md.progress("MMU:setio", 0x302); | |
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183 | |
184 | /* Initialize the context management stuff */ | |
185 | mmu_context_init(); | |
186 | ||
187 | if (ppc_md.progress) | |
188 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
189 | |
190 | /* From now on, btext is no longer BAT mapped if it was at all */ | |
191 | #ifdef CONFIG_BOOTX_TEXT | |
192 | btext_unmap(); | |
193 | #endif | |
14cf11af PM |
194 | } |
195 | ||
196 | /* This is only called until mem_init is done. */ | |
197 | void __init *early_get_page(void) | |
198 | { | |
199 | void *p; | |
200 | ||
201 | if (init_bootmem_done) { | |
202 | p = alloc_bootmem_pages(PAGE_SIZE); | |
203 | } else { | |
7c8c6b97 | 204 | p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, |
09b5e63f | 205 | __initial_memory_limit_addr)); |
14cf11af PM |
206 | } |
207 | return p; | |
208 | } | |
209 | ||
210 | /* Free up now-unused memory */ | |
211 | static void free_sec(unsigned long start, unsigned long end, const char *name) | |
212 | { | |
213 | unsigned long cnt = 0; | |
214 | ||
215 | while (start < end) { | |
216 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 217 | init_page_count(virt_to_page(start)); |
14cf11af PM |
218 | free_page(start); |
219 | cnt++; | |
220 | start += PAGE_SIZE; | |
221 | } | |
222 | if (cnt) { | |
223 | printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name); | |
224 | totalram_pages += cnt; | |
225 | } | |
226 | } | |
227 | ||
228 | void free_initmem(void) | |
229 | { | |
230 | #define FREESEC(TYPE) \ | |
231 | free_sec((unsigned long)(&__ ## TYPE ## _begin), \ | |
232 | (unsigned long)(&__ ## TYPE ## _end), \ | |
233 | #TYPE); | |
234 | ||
235 | printk ("Freeing unused kernel memory:"); | |
236 | FREESEC(init); | |
237 | printk("\n"); | |
238 | ppc_md.progress = NULL; | |
239 | #undef FREESEC | |
240 | } | |
241 | ||
242 | #ifdef CONFIG_BLK_DEV_INITRD | |
243 | void free_initrd_mem(unsigned long start, unsigned long end) | |
244 | { | |
245 | if (start < end) | |
246 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
247 | for (; start < end; start += PAGE_SIZE) { | |
248 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 249 | init_page_count(virt_to_page(start)); |
14cf11af PM |
250 | free_page(start); |
251 | totalram_pages++; | |
252 | } | |
253 | } | |
254 | #endif | |
df174e3b ES |
255 | |
256 | #ifdef CONFIG_PROC_KCORE | |
257 | static struct kcore_list kcore_vmem; | |
258 | ||
259 | static int __init setup_kcore(void) | |
260 | { | |
261 | int i; | |
262 | ||
263 | for (i = 0; i < lmb.memory.cnt; i++) { | |
264 | unsigned long base; | |
265 | unsigned long size; | |
266 | struct kcore_list *kcore_mem; | |
267 | ||
268 | base = lmb.memory.region[i].base; | |
269 | size = lmb.memory.region[i].size; | |
270 | ||
271 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
272 | if (!kcore_mem) | |
e48b1b45 | 273 | panic("%s: kmalloc failed\n", __func__); |
df174e3b ES |
274 | |
275 | /* must stay under 32 bits */ | |
276 | if ( 0xfffffffful - (unsigned long)__va(base) < size) { | |
277 | size = 0xfffffffful - (unsigned long)(__va(base)); | |
278 | printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n", | |
279 | size); | |
280 | } | |
281 | ||
282 | kclist_add(kcore_mem, __va(base), size); | |
283 | } | |
284 | ||
285 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, | |
286 | VMALLOC_END-VMALLOC_START); | |
287 | ||
288 | return 0; | |
289 | } | |
290 | module_init(setup_kcore); | |
291 | #endif |