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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> | |
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) | |
50 | /* The ammount 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 | ||
57 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
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); | |
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 | ||
14cf11af PM |
79 | /* |
80 | * this tells the system to map all of ram with the segregs | |
81 | * (i.e. page tables) instead of the bats. | |
82 | * -- Cort | |
83 | */ | |
84 | int __map_without_bats; | |
85 | int __map_without_ltlbs; | |
86 | ||
14cf11af PM |
87 | /* max amount of low RAM to map in */ |
88 | unsigned long __max_low_memory = MAX_LOW_MEM; | |
89 | ||
90 | /* | |
09b5e63f | 91 | * address of the limit of what is accessible with initial MMU setup - |
7c8c6b97 | 92 | * 256MB usually, but only 16MB on 601. |
14cf11af | 93 | */ |
09b5e63f | 94 | phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000; |
14cf11af PM |
95 | |
96 | /* | |
97 | * Check for command-line options that affect what MMU_init will do. | |
98 | */ | |
99 | void MMU_setup(void) | |
100 | { | |
101 | /* Check for nobats option (used in mapin_ram). */ | |
102 | if (strstr(cmd_line, "nobats")) { | |
103 | __map_without_bats = 1; | |
104 | } | |
105 | ||
106 | if (strstr(cmd_line, "noltlbs")) { | |
107 | __map_without_ltlbs = 1; | |
108 | } | |
88df6e90 BH |
109 | #ifdef CONFIG_DEBUG_PAGEALLOC |
110 | __map_without_bats = 1; | |
111 | __map_without_ltlbs = 1; | |
112 | #endif | |
14cf11af PM |
113 | } |
114 | ||
115 | /* | |
116 | * MMU_init sets up the basic memory mappings for the kernel, | |
117 | * including both RAM and possibly some I/O regions, | |
118 | * and sets up the page tables and the MMU hardware ready to go. | |
119 | */ | |
120 | void __init MMU_init(void) | |
121 | { | |
122 | if (ppc_md.progress) | |
123 | ppc_md.progress("MMU:enter", 0x111); | |
124 | ||
7c8c6b97 PM |
125 | /* 601 can only access 16MB at the moment */ |
126 | if (PVR_VER(mfspr(SPRN_PVR)) == 1) | |
09b5e63f | 127 | __initial_memory_limit_addr = 0x01000000; |
544cdabe JT |
128 | /* 8xx can only access 8MB at the moment */ |
129 | if (PVR_VER(mfspr(SPRN_PVR)) == 0x50) | |
09b5e63f | 130 | __initial_memory_limit_addr = 0x00800000; |
7c8c6b97 | 131 | |
14cf11af PM |
132 | /* parse args from command line */ |
133 | MMU_setup(); | |
134 | ||
7c8c6b97 PM |
135 | if (lmb.memory.cnt > 1) { |
136 | lmb.memory.cnt = 1; | |
137 | lmb_analyze(); | |
138 | printk(KERN_WARNING "Only using first contiguous memory region"); | |
139 | } | |
140 | ||
99c62dd7 | 141 | total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; |
d7917ba7 | 142 | lowmem_end_addr = memstart_addr + total_lowmem; |
7c8c6b97 | 143 | |
14cf11af PM |
144 | #ifdef CONFIG_FSL_BOOKE |
145 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB | |
146 | * entries, so we need to adjust lowmem to match the amount we can map | |
147 | * in the fixed entries */ | |
148 | adjust_total_lowmem(); | |
149 | #endif /* CONFIG_FSL_BOOKE */ | |
fa39dc43 | 150 | |
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151 | if (total_lowmem > __max_low_memory) { |
152 | total_lowmem = __max_low_memory; | |
d7917ba7 | 153 | lowmem_end_addr = memstart_addr + total_lowmem; |
14cf11af PM |
154 | #ifndef CONFIG_HIGHMEM |
155 | total_memory = total_lowmem; | |
d7917ba7 | 156 | lmb_enforce_memory_limit(lowmem_end_addr); |
fa39dc43 | 157 | lmb_analyze(); |
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158 | #endif /* CONFIG_HIGHMEM */ |
159 | } | |
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160 | |
161 | /* Initialize the MMU hardware */ | |
162 | if (ppc_md.progress) | |
163 | ppc_md.progress("MMU:hw init", 0x300); | |
164 | MMU_init_hw(); | |
165 | ||
166 | /* Map in all of RAM starting at KERNELBASE */ | |
167 | if (ppc_md.progress) | |
168 | ppc_md.progress("MMU:mapin", 0x301); | |
169 | mapin_ram(); | |
170 | ||
f637a49e BH |
171 | /* Initialize early top-down ioremap allocator */ |
172 | ioremap_bot = IOREMAP_TOP; | |
14cf11af PM |
173 | |
174 | /* Map in I/O resources */ | |
175 | if (ppc_md.progress) | |
176 | ppc_md.progress("MMU:setio", 0x302); | |
14cf11af | 177 | |
14cf11af PM |
178 | if (ppc_md.progress) |
179 | ppc_md.progress("MMU:exit", 0x211); | |
51d3082f BH |
180 | |
181 | /* From now on, btext is no longer BAT mapped if it was at all */ | |
182 | #ifdef CONFIG_BOOTX_TEXT | |
183 | btext_unmap(); | |
184 | #endif | |
14cf11af PM |
185 | } |
186 | ||
187 | /* This is only called until mem_init is done. */ | |
188 | void __init *early_get_page(void) | |
189 | { | |
190 | void *p; | |
191 | ||
192 | if (init_bootmem_done) { | |
193 | p = alloc_bootmem_pages(PAGE_SIZE); | |
194 | } else { | |
7c8c6b97 | 195 | p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, |
09b5e63f | 196 | __initial_memory_limit_addr)); |
14cf11af PM |
197 | } |
198 | return p; | |
199 | } | |
200 | ||
201 | /* Free up now-unused memory */ | |
202 | static void free_sec(unsigned long start, unsigned long end, const char *name) | |
203 | { | |
204 | unsigned long cnt = 0; | |
205 | ||
206 | while (start < end) { | |
207 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 208 | init_page_count(virt_to_page(start)); |
14cf11af PM |
209 | free_page(start); |
210 | cnt++; | |
211 | start += PAGE_SIZE; | |
212 | } | |
213 | if (cnt) { | |
214 | printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name); | |
215 | totalram_pages += cnt; | |
216 | } | |
217 | } | |
218 | ||
219 | void free_initmem(void) | |
220 | { | |
221 | #define FREESEC(TYPE) \ | |
222 | free_sec((unsigned long)(&__ ## TYPE ## _begin), \ | |
223 | (unsigned long)(&__ ## TYPE ## _end), \ | |
224 | #TYPE); | |
225 | ||
226 | printk ("Freeing unused kernel memory:"); | |
227 | FREESEC(init); | |
228 | printk("\n"); | |
229 | ppc_md.progress = NULL; | |
230 | #undef FREESEC | |
231 | } | |
232 | ||
233 | #ifdef CONFIG_BLK_DEV_INITRD | |
234 | void free_initrd_mem(unsigned long start, unsigned long end) | |
235 | { | |
236 | if (start < end) | |
237 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
238 | for (; start < end; start += PAGE_SIZE) { | |
239 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 240 | init_page_count(virt_to_page(start)); |
14cf11af PM |
241 | free_page(start); |
242 | totalram_pages++; | |
243 | } | |
244 | } | |
245 | #endif | |
df174e3b ES |
246 | |
247 | #ifdef CONFIG_PROC_KCORE | |
248 | static struct kcore_list kcore_vmem; | |
249 | ||
250 | static int __init setup_kcore(void) | |
251 | { | |
252 | int i; | |
253 | ||
254 | for (i = 0; i < lmb.memory.cnt; i++) { | |
255 | unsigned long base; | |
256 | unsigned long size; | |
257 | struct kcore_list *kcore_mem; | |
258 | ||
259 | base = lmb.memory.region[i].base; | |
260 | size = lmb.memory.region[i].size; | |
261 | ||
262 | kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC); | |
263 | if (!kcore_mem) | |
e48b1b45 | 264 | panic("%s: kmalloc failed\n", __func__); |
df174e3b ES |
265 | |
266 | /* must stay under 32 bits */ | |
267 | if ( 0xfffffffful - (unsigned long)__va(base) < size) { | |
268 | size = 0xfffffffful - (unsigned long)(__va(base)); | |
269 | printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n", | |
270 | size); | |
271 | } | |
272 | ||
273 | kclist_add(kcore_mem, __va(base), size); | |
274 | } | |
275 | ||
276 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, | |
277 | VMALLOC_END-VMALLOC_START); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | module_init(setup_kcore); | |
282 | #endif |