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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> | |
27 | ||
28 | #include <asm/bootinfo.h> | |
29 | #include <asm/cachectl.h> | |
30 | #include <asm/cpu.h> | |
31 | #include <asm/dma.h> | |
32 | #include <asm/mmu_context.h> | |
33 | #include <asm/sections.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/pgalloc.h> | |
36 | #include <asm/tlb.h> | |
37 | ||
38 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
39 | ||
40 | unsigned long highstart_pfn, highend_pfn; | |
41 | ||
42 | /* | |
43 | * We have up to 8 empty zeroed pages so we can map one of the right colour | |
44 | * when needed. This is necessary only on R4000 / R4400 SC and MC versions | |
45 | * where we have to avoid VCED / VECI exceptions for good performance at | |
46 | * any price. Since page is never written to after the initialization we | |
47 | * don't have to care about aliases on other CPUs. | |
48 | */ | |
49 | unsigned long empty_zero_page, zero_page_mask; | |
50 | ||
51 | /* | |
52 | * Not static inline because used by IP27 special magic initialization code | |
53 | */ | |
54 | unsigned long setup_zero_pages(void) | |
55 | { | |
56 | unsigned long order, size; | |
57 | struct page *page; | |
58 | ||
59 | if (cpu_has_vce) | |
60 | order = 3; | |
61 | else | |
62 | order = 0; | |
63 | ||
64 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
65 | if (!empty_zero_page) | |
66 | panic("Oh boy, that early out of memory?"); | |
67 | ||
68 | page = virt_to_page(empty_zero_page); | |
69 | while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) { | |
70 | set_bit(PG_reserved, &page->flags); | |
71 | set_page_count(page, 0); | |
72 | page++; | |
73 | } | |
74 | ||
75 | size = PAGE_SIZE << order; | |
76 | zero_page_mask = (size - 1) & PAGE_MASK; | |
77 | ||
78 | return 1UL << order; | |
79 | } | |
80 | ||
81 | #ifdef CONFIG_HIGHMEM | |
82 | pte_t *kmap_pte; | |
83 | pgprot_t kmap_prot; | |
84 | ||
85 | #define kmap_get_fixmap_pte(vaddr) \ | |
86 | pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)) | |
87 | ||
88 | static void __init kmap_init(void) | |
89 | { | |
90 | unsigned long kmap_vstart; | |
91 | ||
92 | /* cache the first kmap pte */ | |
93 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
94 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
95 | ||
96 | kmap_prot = PAGE_KERNEL; | |
97 | } | |
98 | ||
875d43e7 | 99 | #ifdef CONFIG_64BIT |
1da177e4 LT |
100 | static void __init fixrange_init(unsigned long start, unsigned long end, |
101 | pgd_t *pgd_base) | |
102 | { | |
103 | pgd_t *pgd; | |
104 | pmd_t *pmd; | |
105 | pte_t *pte; | |
106 | int i, j; | |
107 | unsigned long vaddr; | |
108 | ||
109 | vaddr = start; | |
110 | i = __pgd_offset(vaddr); | |
111 | j = __pmd_offset(vaddr); | |
112 | pgd = pgd_base + i; | |
113 | ||
114 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
115 | pmd = (pmd_t *)pgd; | |
116 | for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { | |
117 | if (pmd_none(*pmd)) { | |
118 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
119 | set_pmd(pmd, __pmd(pte)); | |
120 | if (pte != pte_offset_kernel(pmd, 0)) | |
121 | BUG(); | |
122 | } | |
123 | vaddr += PMD_SIZE; | |
124 | } | |
125 | j = 0; | |
126 | } | |
127 | } | |
875d43e7 | 128 | #endif /* CONFIG_64BIT */ |
1da177e4 LT |
129 | #endif /* CONFIG_HIGHMEM */ |
130 | ||
b4819b59 | 131 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
132 | extern void pagetable_init(void); |
133 | ||
134 | void __init paging_init(void) | |
135 | { | |
136 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
137 | unsigned long max_dma, high, low; | |
138 | ||
139 | pagetable_init(); | |
140 | ||
141 | #ifdef CONFIG_HIGHMEM | |
142 | kmap_init(); | |
143 | #endif | |
144 | ||
145 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
146 | low = max_low_pfn; | |
147 | high = highend_pfn; | |
148 | ||
149 | #ifdef CONFIG_ISA | |
150 | if (low < max_dma) | |
151 | zones_size[ZONE_DMA] = low; | |
152 | else { | |
153 | zones_size[ZONE_DMA] = max_dma; | |
154 | zones_size[ZONE_NORMAL] = low - max_dma; | |
155 | } | |
156 | #else | |
157 | zones_size[ZONE_DMA] = low; | |
158 | #endif | |
159 | #ifdef CONFIG_HIGHMEM | |
160 | if (cpu_has_dc_aliases) { | |
161 | printk(KERN_WARNING "This processor doesn't support highmem."); | |
162 | if (high - low) | |
163 | printk(" %ldk highmem ignored", high - low); | |
164 | printk("\n"); | |
165 | } else | |
166 | zones_size[ZONE_HIGHMEM] = high - low; | |
167 | #endif | |
168 | ||
169 | free_area_init(zones_size); | |
170 | } | |
171 | ||
172 | #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) | |
173 | #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) | |
174 | ||
175 | static inline int page_is_ram(unsigned long pagenr) | |
176 | { | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
180 | unsigned long addr, end; | |
181 | ||
182 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
183 | /* not usable memory */ | |
184 | continue; | |
185 | ||
186 | addr = PFN_UP(boot_mem_map.map[i].addr); | |
187 | end = PFN_DOWN(boot_mem_map.map[i].addr + | |
188 | boot_mem_map.map[i].size); | |
189 | ||
190 | if (pagenr >= addr && pagenr < end) | |
191 | return 1; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | void __init mem_init(void) | |
198 | { | |
199 | unsigned long codesize, reservedpages, datasize, initsize; | |
200 | unsigned long tmp, ram; | |
201 | ||
202 | #ifdef CONFIG_HIGHMEM | |
203 | #ifdef CONFIG_DISCONTIGMEM | |
204 | #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" | |
205 | #endif | |
206 | max_mapnr = num_physpages = highend_pfn; | |
207 | #else | |
208 | max_mapnr = num_physpages = max_low_pfn; | |
209 | #endif | |
210 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); | |
211 | ||
212 | totalram_pages += free_all_bootmem(); | |
213 | totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ | |
214 | ||
215 | reservedpages = ram = 0; | |
216 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
217 | if (page_is_ram(tmp)) { | |
218 | ram++; | |
219 | if (PageReserved(mem_map+tmp)) | |
220 | reservedpages++; | |
221 | } | |
222 | ||
223 | #ifdef CONFIG_HIGHMEM | |
224 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { | |
225 | struct page *page = mem_map + tmp; | |
226 | ||
227 | if (!page_is_ram(tmp)) { | |
228 | SetPageReserved(page); | |
229 | continue; | |
230 | } | |
231 | ClearPageReserved(page); | |
232 | #ifdef CONFIG_LIMITED_DMA | |
233 | set_page_address(page, lowmem_page_address(page)); | |
234 | #endif | |
1da177e4 LT |
235 | set_page_count(page, 1); |
236 | __free_page(page); | |
237 | totalhigh_pages++; | |
238 | } | |
239 | totalram_pages += totalhigh_pages; | |
240 | #endif | |
241 | ||
242 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
243 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
244 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
245 | ||
246 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " | |
247 | "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", | |
248 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
249 | ram << (PAGE_SHIFT-10), | |
250 | codesize >> 10, | |
251 | reservedpages << (PAGE_SHIFT-10), | |
252 | datasize >> 10, | |
253 | initsize >> 10, | |
254 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); | |
255 | } | |
b4819b59 | 256 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 LT |
257 | |
258 | #ifdef CONFIG_BLK_DEV_INITRD | |
259 | void free_initrd_mem(unsigned long start, unsigned long end) | |
260 | { | |
875d43e7 | 261 | #ifdef CONFIG_64BIT |
1da177e4 LT |
262 | /* Switch from KSEG0 to XKPHYS addresses */ |
263 | start = (unsigned long)phys_to_virt(CPHYSADDR(start)); | |
264 | end = (unsigned long)phys_to_virt(CPHYSADDR(end)); | |
265 | #endif | |
266 | if (start < end) | |
267 | printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", | |
268 | (end - start) >> 10); | |
269 | ||
270 | for (; start < end; start += PAGE_SIZE) { | |
271 | ClearPageReserved(virt_to_page(start)); | |
272 | set_page_count(virt_to_page(start), 1); | |
273 | free_page(start); | |
274 | totalram_pages++; | |
275 | } | |
276 | } | |
277 | #endif | |
278 | ||
279 | extern unsigned long prom_free_prom_memory(void); | |
280 | ||
281 | void free_initmem(void) | |
282 | { | |
283 | unsigned long addr, page, freed; | |
284 | ||
285 | freed = prom_free_prom_memory(); | |
286 | ||
287 | addr = (unsigned long) &__init_begin; | |
288 | while (addr < (unsigned long) &__init_end) { | |
875d43e7 | 289 | #ifdef CONFIG_64BIT |
1da177e4 LT |
290 | page = PAGE_OFFSET | CPHYSADDR(addr); |
291 | #else | |
292 | page = addr; | |
293 | #endif | |
294 | ClearPageReserved(virt_to_page(page)); | |
295 | set_page_count(virt_to_page(page), 1); | |
296 | free_page(page); | |
297 | totalram_pages++; | |
298 | freed += PAGE_SIZE; | |
299 | addr += PAGE_SIZE; | |
300 | } | |
301 | printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", | |
302 | freed >> 10); | |
303 | } |