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1da177e4 LT |
1 | /* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $ |
2 | * | |
3 | * linux/arch/sh/mm/init.c | |
4 | * | |
5 | * Copyright (C) 1999 Niibe Yutaka | |
6 | * Copyright (C) 2002, 2004 Paul Mundt | |
7 | * | |
8 | * Based on linux/arch/i386/mm/init.c: | |
9 | * Copyright (C) 1995 Linus Torvalds | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/signal.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/pagemap.h> | |
28 | ||
29 | #include <asm/processor.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/mmu_context.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/tlb.h> | |
37 | #include <asm/cacheflush.h> | |
38 | #include <asm/cache.h> | |
39 | ||
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
42 | ||
43 | /* | |
44 | * Cache of MMU context last used. | |
45 | */ | |
46 | unsigned long mmu_context_cache = NO_CONTEXT; | |
47 | ||
48 | #ifdef CONFIG_MMU | |
49 | /* It'd be good if these lines were in the standard header file. */ | |
50 | #define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT) | |
51 | #define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn) | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_DISCONTIGMEM | |
55 | pg_data_t discontig_page_data[MAX_NUMNODES]; | |
56 | bootmem_data_t discontig_node_bdata[MAX_NUMNODES]; | |
57 | #endif | |
58 | ||
59 | void (*copy_page)(void *from, void *to); | |
60 | void (*clear_page)(void *to); | |
61 | ||
62 | void show_mem(void) | |
63 | { | |
64 | int i, total = 0, reserved = 0; | |
65 | int shared = 0, cached = 0; | |
66 | ||
67 | printk("Mem-info:\n"); | |
68 | show_free_areas(); | |
69 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
70 | i = max_mapnr; | |
71 | while (i-- > 0) { | |
72 | total++; | |
73 | if (PageReserved(mem_map+i)) | |
74 | reserved++; | |
75 | else if (PageSwapCache(mem_map+i)) | |
76 | cached++; | |
77 | else if (page_count(mem_map+i)) | |
78 | shared += page_count(mem_map+i) - 1; | |
79 | } | |
80 | printk("%d pages of RAM\n",total); | |
81 | printk("%d reserved pages\n",reserved); | |
82 | printk("%d pages shared\n",shared); | |
83 | printk("%d pages swap cached\n",cached); | |
84 | } | |
85 | ||
86 | static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) | |
87 | { | |
88 | pgd_t *pgd; | |
89 | pmd_t *pmd; | |
90 | pte_t *pte; | |
91 | ||
92 | pgd = swapper_pg_dir + pgd_index(addr); | |
93 | if (pgd_none(*pgd)) { | |
94 | pgd_ERROR(*pgd); | |
95 | return; | |
96 | } | |
97 | ||
98 | pmd = pmd_offset(pgd, addr); | |
99 | if (pmd_none(*pmd)) { | |
100 | pte = (pte_t *)get_zeroed_page(GFP_ATOMIC); | |
101 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
102 | if (pte != pte_offset_kernel(pmd, 0)) { | |
103 | pmd_ERROR(*pmd); | |
104 | return; | |
105 | } | |
106 | } | |
107 | ||
108 | pte = pte_offset_kernel(pmd, addr); | |
109 | if (!pte_none(*pte)) { | |
110 | pte_ERROR(*pte); | |
111 | return; | |
112 | } | |
113 | ||
114 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); | |
115 | ||
116 | __flush_tlb_page(get_asid(), addr); | |
117 | } | |
118 | ||
119 | /* | |
120 | * As a performance optimization, other platforms preserve the fixmap mapping | |
121 | * across a context switch, we don't presently do this, but this could be done | |
122 | * in a similar fashion as to the wired TLB interface that sh64 uses (by way | |
123 | * of the memorry mapped UTLB configuration) -- this unfortunately forces us to | |
124 | * give up a TLB entry for each mapping we want to preserve. While this may be | |
125 | * viable for a small number of fixmaps, it's not particularly useful for | |
126 | * everything and needs to be carefully evaluated. (ie, we may want this for | |
127 | * the vsyscall page). | |
128 | * | |
129 | * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass | |
130 | * in at __set_fixmap() time to determine the appropriate behavior to follow. | |
131 | * | |
132 | * -- PFM. | |
133 | */ | |
134 | void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
135 | { | |
136 | unsigned long address = __fix_to_virt(idx); | |
137 | ||
138 | if (idx >= __end_of_fixed_addresses) { | |
139 | BUG(); | |
140 | return; | |
141 | } | |
142 | ||
143 | set_pte_phys(address, phys, prot); | |
144 | } | |
145 | ||
146 | /* References to section boundaries */ | |
147 | ||
148 | extern char _text, _etext, _edata, __bss_start, _end; | |
149 | extern char __init_begin, __init_end; | |
150 | ||
151 | /* | |
152 | * paging_init() sets up the page tables | |
153 | * | |
154 | * This routines also unmaps the page at virtual kernel address 0, so | |
155 | * that we can trap those pesky NULL-reference errors in the kernel. | |
156 | */ | |
157 | void __init paging_init(void) | |
158 | { | |
159 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
160 | ||
161 | /* | |
162 | * Setup some defaults for the zone sizes.. these should be safe | |
163 | * regardless of distcontiguous memory or MMU settings. | |
164 | */ | |
165 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
166 | zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; | |
167 | #ifdef CONFIG_HIGHMEM | |
168 | zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT; | |
169 | #endif | |
170 | ||
171 | #ifdef CONFIG_MMU | |
172 | /* | |
173 | * If we have an MMU, and want to be using it .. we need to adjust | |
174 | * the zone sizes accordingly, in addition to turning it on. | |
175 | */ | |
176 | { | |
177 | unsigned long max_dma, low, start_pfn; | |
178 | pgd_t *pg_dir; | |
179 | int i; | |
180 | ||
181 | /* We don't need kernel mapping as hardware support that. */ | |
182 | pg_dir = swapper_pg_dir; | |
183 | ||
184 | for (i = 0; i < PTRS_PER_PGD; i++) | |
185 | pgd_val(pg_dir[i]) = 0; | |
186 | ||
187 | /* Turn on the MMU */ | |
188 | enable_mmu(); | |
189 | ||
190 | /* Fixup the zone sizes */ | |
191 | start_pfn = START_PFN; | |
192 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
193 | low = MAX_LOW_PFN; | |
194 | ||
195 | if (low < max_dma) { | |
196 | zones_size[ZONE_DMA] = low - start_pfn; | |
197 | zones_size[ZONE_NORMAL] = 0; | |
198 | } else { | |
199 | zones_size[ZONE_DMA] = max_dma - start_pfn; | |
200 | zones_size[ZONE_NORMAL] = low - max_dma; | |
201 | } | |
202 | } | |
203 | ||
204 | #elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) | |
205 | /* | |
206 | * If we don't have CONFIG_MMU set and the processor in question | |
207 | * still has an MMU, care needs to be taken to make sure it doesn't | |
208 | * stay on.. Since the boot loader could have potentially already | |
209 | * turned it on, and we clearly don't want it, we simply turn it off. | |
210 | * | |
211 | * We don't need to do anything special for the zone sizes, since the | |
212 | * default values that were already configured up above should be | |
213 | * satisfactory. | |
214 | */ | |
215 | disable_mmu(); | |
216 | #endif | |
217 | NODE_DATA(0)->node_mem_map = NULL; | |
218 | free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0); | |
219 | ||
220 | #ifdef CONFIG_DISCONTIGMEM | |
221 | /* | |
222 | * And for discontig, do some more fixups on the zone sizes.. | |
223 | */ | |
224 | zones_size[ZONE_DMA] = __MEMORY_SIZE_2ND >> PAGE_SHIFT; | |
225 | zones_size[ZONE_NORMAL] = 0; | |
226 | free_area_init_node(1, NODE_DATA(1), zones_size, __MEMORY_START_2ND >> PAGE_SHIFT, 0); | |
227 | #endif | |
228 | } | |
229 | ||
230 | void __init mem_init(void) | |
231 | { | |
232 | extern unsigned long empty_zero_page[1024]; | |
233 | int codesize, reservedpages, datasize, initsize; | |
234 | int tmp; | |
235 | extern unsigned long memory_start; | |
236 | ||
237 | #ifdef CONFIG_MMU | |
238 | high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE); | |
239 | #else | |
240 | extern unsigned long memory_end; | |
241 | ||
242 | high_memory = (void *)(memory_end & PAGE_MASK); | |
243 | #endif | |
244 | ||
245 | max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start); | |
246 | ||
247 | /* clear the zero-page */ | |
248 | memset(empty_zero_page, 0, PAGE_SIZE); | |
249 | __flush_wback_region(empty_zero_page, PAGE_SIZE); | |
250 | ||
251 | /* | |
252 | * Setup wrappers for copy/clear_page(), these will get overridden | |
253 | * later in the boot process if a better method is available. | |
254 | */ | |
255 | copy_page = copy_page_slow; | |
256 | clear_page = clear_page_slow; | |
257 | ||
258 | /* this will put all low memory onto the freelists */ | |
259 | totalram_pages += free_all_bootmem_node(NODE_DATA(0)); | |
260 | #ifdef CONFIG_DISCONTIGMEM | |
261 | totalram_pages += free_all_bootmem_node(NODE_DATA(1)); | |
262 | #endif | |
263 | reservedpages = 0; | |
264 | for (tmp = 0; tmp < num_physpages; tmp++) | |
265 | /* | |
266 | * Only count reserved RAM pages | |
267 | */ | |
268 | if (PageReserved(mem_map+tmp)) | |
269 | reservedpages++; | |
270 | ||
271 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
272 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
273 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
274 | ||
275 | printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", | |
276 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
277 | max_mapnr << (PAGE_SHIFT-10), | |
278 | codesize >> 10, | |
279 | reservedpages << (PAGE_SHIFT-10), | |
280 | datasize >> 10, | |
281 | initsize >> 10); | |
282 | ||
283 | p3_cache_init(); | |
284 | } | |
285 | ||
286 | void free_initmem(void) | |
287 | { | |
288 | unsigned long addr; | |
289 | ||
290 | addr = (unsigned long)(&__init_begin); | |
291 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
292 | ClearPageReserved(virt_to_page(addr)); | |
293 | set_page_count(virt_to_page(addr), 1); | |
294 | free_page(addr); | |
295 | totalram_pages++; | |
296 | } | |
297 | printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10); | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_BLK_DEV_INITRD | |
301 | void free_initrd_mem(unsigned long start, unsigned long end) | |
302 | { | |
303 | unsigned long p; | |
304 | for (p = start; p < end; p += PAGE_SIZE) { | |
305 | ClearPageReserved(virt_to_page(p)); | |
306 | set_page_count(virt_to_page(p), 1); | |
307 | free_page(p); | |
308 | totalram_pages++; | |
309 | } | |
310 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
311 | } | |
312 | #endif | |
313 |