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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
9 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
10 | */ | |
11 | #include <linux/config.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/mman.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/bootmem.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/swap.h> | |
3d503753 | 27 | #include <linux/proc_fs.h> |
22a9835c | 28 | #include <linux/pfn.h> |
1da177e4 LT |
29 | |
30 | #include <asm/bootinfo.h> | |
31 | #include <asm/cachectl.h> | |
32 | #include <asm/cpu.h> | |
33 | #include <asm/dma.h> | |
34 | #include <asm/mmu_context.h> | |
35 | #include <asm/sections.h> | |
36 | #include <asm/pgtable.h> | |
37 | #include <asm/pgalloc.h> | |
38 | #include <asm/tlb.h> | |
39 | ||
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | ||
42 | unsigned long highstart_pfn, highend_pfn; | |
43 | ||
44 | /* | |
45 | * We have up to 8 empty zeroed pages so we can map one of the right colour | |
46 | * when needed. This is necessary only on R4000 / R4400 SC and MC versions | |
47 | * where we have to avoid VCED / VECI exceptions for good performance at | |
48 | * any price. Since page is never written to after the initialization we | |
49 | * don't have to care about aliases on other CPUs. | |
50 | */ | |
51 | unsigned long empty_zero_page, zero_page_mask; | |
52 | ||
53 | /* | |
54 | * Not static inline because used by IP27 special magic initialization code | |
55 | */ | |
56 | unsigned long setup_zero_pages(void) | |
57 | { | |
8dfcc9ba NP |
58 | unsigned int order; |
59 | unsigned long size; | |
1da177e4 LT |
60 | struct page *page; |
61 | ||
62 | if (cpu_has_vce) | |
63 | order = 3; | |
64 | else | |
65 | order = 0; | |
66 | ||
67 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
68 | if (!empty_zero_page) | |
69 | panic("Oh boy, that early out of memory?"); | |
70 | ||
71 | page = virt_to_page(empty_zero_page); | |
8dfcc9ba | 72 | split_page(page, order); |
1da177e4 | 73 | while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { |
68352e6e | 74 | SetPageReserved(page); |
1da177e4 LT |
75 | page++; |
76 | } | |
77 | ||
78 | size = PAGE_SIZE << order; | |
79 | zero_page_mask = (size - 1) & PAGE_MASK; | |
80 | ||
81 | return 1UL << order; | |
82 | } | |
83 | ||
84 | #ifdef CONFIG_HIGHMEM | |
85 | pte_t *kmap_pte; | |
86 | pgprot_t kmap_prot; | |
87 | ||
88 | #define kmap_get_fixmap_pte(vaddr) \ | |
c6e8b587 | 89 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) |
1da177e4 LT |
90 | |
91 | static void __init kmap_init(void) | |
92 | { | |
93 | unsigned long kmap_vstart; | |
94 | ||
95 | /* cache the first kmap pte */ | |
96 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
97 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
98 | ||
99 | kmap_prot = PAGE_KERNEL; | |
100 | } | |
101 | ||
84fd089a RB |
102 | #ifdef CONFIG_32BIT |
103 | void __init fixrange_init(unsigned long start, unsigned long end, | |
1da177e4 LT |
104 | pgd_t *pgd_base) |
105 | { | |
106 | pgd_t *pgd; | |
c6e8b587 | 107 | pud_t *pud; |
1da177e4 LT |
108 | pmd_t *pmd; |
109 | pte_t *pte; | |
c6e8b587 | 110 | int i, j, k; |
1da177e4 LT |
111 | unsigned long vaddr; |
112 | ||
113 | vaddr = start; | |
114 | i = __pgd_offset(vaddr); | |
c6e8b587 RB |
115 | j = __pud_offset(vaddr); |
116 | k = __pmd_offset(vaddr); | |
1da177e4 LT |
117 | pgd = pgd_base + i; |
118 | ||
119 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
c6e8b587 RB |
120 | pud = (pud_t *)pgd; |
121 | for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { | |
122 | pmd = (pmd_t *)pud; | |
123 | for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { | |
124 | if (pmd_none(*pmd)) { | |
125 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
126 | set_pmd(pmd, __pmd(pte)); | |
127 | if (pte != pte_offset_kernel(pmd, 0)) | |
128 | BUG(); | |
129 | } | |
130 | vaddr += PMD_SIZE; | |
1da177e4 | 131 | } |
c6e8b587 | 132 | k = 0; |
1da177e4 LT |
133 | } |
134 | j = 0; | |
135 | } | |
136 | } | |
dbc57169 | 137 | #endif /* CONFIG_32BIT */ |
1da177e4 LT |
138 | #endif /* CONFIG_HIGHMEM */ |
139 | ||
b4819b59 | 140 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
141 | extern void pagetable_init(void); |
142 | ||
143 | void __init paging_init(void) | |
144 | { | |
145 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
146 | unsigned long max_dma, high, low; | |
147 | ||
148 | pagetable_init(); | |
149 | ||
150 | #ifdef CONFIG_HIGHMEM | |
151 | kmap_init(); | |
152 | #endif | |
153 | ||
154 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
155 | low = max_low_pfn; | |
156 | high = highend_pfn; | |
157 | ||
158 | #ifdef CONFIG_ISA | |
159 | if (low < max_dma) | |
160 | zones_size[ZONE_DMA] = low; | |
161 | else { | |
162 | zones_size[ZONE_DMA] = max_dma; | |
163 | zones_size[ZONE_NORMAL] = low - max_dma; | |
164 | } | |
165 | #else | |
166 | zones_size[ZONE_DMA] = low; | |
167 | #endif | |
168 | #ifdef CONFIG_HIGHMEM | |
169 | if (cpu_has_dc_aliases) { | |
170 | printk(KERN_WARNING "This processor doesn't support highmem."); | |
171 | if (high - low) | |
172 | printk(" %ldk highmem ignored", high - low); | |
173 | printk("\n"); | |
174 | } else | |
175 | zones_size[ZONE_HIGHMEM] = high - low; | |
176 | #endif | |
177 | ||
178 | free_area_init(zones_size); | |
179 | } | |
180 | ||
1da177e4 LT |
181 | static inline int page_is_ram(unsigned long pagenr) |
182 | { | |
183 | int i; | |
184 | ||
185 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
186 | unsigned long addr, end; | |
187 | ||
188 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
189 | /* not usable memory */ | |
190 | continue; | |
191 | ||
192 | addr = PFN_UP(boot_mem_map.map[i].addr); | |
193 | end = PFN_DOWN(boot_mem_map.map[i].addr + | |
194 | boot_mem_map.map[i].size); | |
195 | ||
196 | if (pagenr >= addr && pagenr < end) | |
197 | return 1; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
3d503753 DJ |
203 | static struct kcore_list kcore_mem, kcore_vmalloc; |
204 | #ifdef CONFIG_64BIT | |
205 | static struct kcore_list kcore_kseg0; | |
206 | #endif | |
207 | ||
1da177e4 LT |
208 | void __init mem_init(void) |
209 | { | |
210 | unsigned long codesize, reservedpages, datasize, initsize; | |
211 | unsigned long tmp, ram; | |
212 | ||
213 | #ifdef CONFIG_HIGHMEM | |
214 | #ifdef CONFIG_DISCONTIGMEM | |
215 | #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" | |
216 | #endif | |
217 | max_mapnr = num_physpages = highend_pfn; | |
218 | #else | |
219 | max_mapnr = num_physpages = max_low_pfn; | |
220 | #endif | |
221 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); | |
222 | ||
223 | totalram_pages += free_all_bootmem(); | |
224 | totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ | |
225 | ||
226 | reservedpages = ram = 0; | |
227 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
228 | if (page_is_ram(tmp)) { | |
229 | ram++; | |
230 | if (PageReserved(mem_map+tmp)) | |
231 | reservedpages++; | |
232 | } | |
233 | ||
234 | #ifdef CONFIG_HIGHMEM | |
235 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { | |
236 | struct page *page = mem_map + tmp; | |
237 | ||
238 | if (!page_is_ram(tmp)) { | |
239 | SetPageReserved(page); | |
240 | continue; | |
241 | } | |
242 | ClearPageReserved(page); | |
243 | #ifdef CONFIG_LIMITED_DMA | |
244 | set_page_address(page, lowmem_page_address(page)); | |
245 | #endif | |
7835e98b | 246 | init_page_count(page); |
1da177e4 LT |
247 | __free_page(page); |
248 | totalhigh_pages++; | |
249 | } | |
250 | totalram_pages += totalhigh_pages; | |
251 | #endif | |
252 | ||
253 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
254 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
255 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
256 | ||
3d503753 DJ |
257 | #ifdef CONFIG_64BIT |
258 | if ((unsigned long) &_text > (unsigned long) CKSEG0) | |
259 | /* The -4 is a hack so that user tools don't have to handle | |
260 | the overflow. */ | |
261 | kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); | |
262 | #endif | |
263 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
264 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
265 | VMALLOC_END-VMALLOC_START); | |
266 | ||
1da177e4 LT |
267 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
268 | "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", | |
269 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
270 | ram << (PAGE_SHIFT-10), | |
271 | codesize >> 10, | |
272 | reservedpages << (PAGE_SHIFT-10), | |
273 | datasize >> 10, | |
274 | initsize >> 10, | |
275 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); | |
276 | } | |
b4819b59 | 277 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
278 | |
279 | #ifdef CONFIG_BLK_DEV_INITRD | |
280 | void free_initrd_mem(unsigned long start, unsigned long end) | |
281 | { | |
875d43e7 | 282 | #ifdef CONFIG_64BIT |
1da177e4 LT |
283 | /* Switch from KSEG0 to XKPHYS addresses */ |
284 | start = (unsigned long)phys_to_virt(CPHYSADDR(start)); | |
285 | end = (unsigned long)phys_to_virt(CPHYSADDR(end)); | |
286 | #endif | |
287 | if (start < end) | |
288 | printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", | |
289 | (end - start) >> 10); | |
290 | ||
291 | for (; start < end; start += PAGE_SIZE) { | |
292 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 293 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
294 | free_page(start); |
295 | totalram_pages++; | |
296 | } | |
297 | } | |
298 | #endif | |
299 | ||
300 | extern unsigned long prom_free_prom_memory(void); | |
301 | ||
302 | void free_initmem(void) | |
303 | { | |
304 | unsigned long addr, page, freed; | |
305 | ||
306 | freed = prom_free_prom_memory(); | |
307 | ||
308 | addr = (unsigned long) &__init_begin; | |
309 | while (addr < (unsigned long) &__init_end) { | |
875d43e7 | 310 | #ifdef CONFIG_64BIT |
1da177e4 LT |
311 | page = PAGE_OFFSET | CPHYSADDR(addr); |
312 | #else | |
313 | page = addr; | |
314 | #endif | |
315 | ClearPageReserved(virt_to_page(page)); | |
7835e98b | 316 | init_page_count(virt_to_page(page)); |
1da177e4 LT |
317 | free_page(page); |
318 | totalram_pages++; | |
319 | freed += PAGE_SIZE; | |
320 | addr += PAGE_SIZE; | |
321 | } | |
322 | printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", | |
323 | freed >> 10); | |
324 | } |