Commit | Line | Data |
---|---|---|
01066625 PM |
1 | /* |
2 | * linux/arch/sh/mm/init.c | |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1999 Niibe Yutaka | |
01066625 | 5 | * Copyright (C) 2002 - 2007 Paul Mundt |
1da177e4 LT |
6 | * |
7 | * Based on linux/arch/i386/mm/init.c: | |
8 | * Copyright (C) 1995 Linus Torvalds | |
9 | */ | |
1da177e4 LT |
10 | #include <linux/mm.h> |
11 | #include <linux/swap.h> | |
1da177e4 | 12 | #include <linux/init.h> |
1da177e4 | 13 | #include <linux/bootmem.h> |
2cb7ce3b | 14 | #include <linux/proc_fs.h> |
27641dee | 15 | #include <linux/pagemap.h> |
01066625 PM |
16 | #include <linux/percpu.h> |
17 | #include <linux/io.h> | |
94c28510 | 18 | #include <linux/dma-mapping.h> |
1da177e4 | 19 | #include <asm/mmu_context.h> |
1da177e4 LT |
20 | #include <asm/tlb.h> |
21 | #include <asm/cacheflush.h> | |
07cbb41b | 22 | #include <asm/sections.h> |
1da177e4 LT |
23 | #include <asm/cache.h> |
24 | ||
25 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
26 | pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
c6feb614 SM |
27 | |
28 | #ifdef CONFIG_SUPERH32 | |
29 | /* | |
30 | * Handle trivial transitions between cached and uncached | |
31 | * segments, making use of the 1:1 mapping relationship in | |
32 | * 512MB lowmem. | |
33 | * | |
34 | * This is the offset of the uncached section from its cached alias. | |
35 | * Default value only valid in 29 bit mode, in 32bit mode will be | |
36 | * overridden in pmb_init. | |
37 | */ | |
38 | unsigned long cached_to_uncached = P2SEG - P1SEG; | |
39 | #endif | |
1da177e4 | 40 | |
11cbb70e | 41 | #ifdef CONFIG_MMU |
07cad4dc | 42 | static pte_t *__get_pte_phys(unsigned long addr) |
1da177e4 LT |
43 | { |
44 | pgd_t *pgd; | |
26ff6c11 | 45 | pud_t *pud; |
1da177e4 LT |
46 | pmd_t *pmd; |
47 | pte_t *pte; | |
48 | ||
99a596f9 | 49 | pgd = pgd_offset_k(addr); |
1da177e4 LT |
50 | if (pgd_none(*pgd)) { |
51 | pgd_ERROR(*pgd); | |
07cad4dc | 52 | return NULL; |
1da177e4 LT |
53 | } |
54 | ||
99a596f9 SM |
55 | pud = pud_alloc(NULL, pgd, addr); |
56 | if (unlikely(!pud)) { | |
57 | pud_ERROR(*pud); | |
07cad4dc | 58 | return NULL; |
26ff6c11 PM |
59 | } |
60 | ||
99a596f9 SM |
61 | pmd = pmd_alloc(NULL, pud, addr); |
62 | if (unlikely(!pmd)) { | |
63 | pmd_ERROR(*pmd); | |
07cad4dc | 64 | return NULL; |
1da177e4 LT |
65 | } |
66 | ||
67 | pte = pte_offset_kernel(pmd, addr); | |
07cad4dc MF |
68 | return pte; |
69 | } | |
70 | ||
71 | static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) | |
72 | { | |
73 | pte_t *pte; | |
74 | ||
75 | pte = __get_pte_phys(addr); | |
1da177e4 LT |
76 | if (!pte_none(*pte)) { |
77 | pte_ERROR(*pte); | |
78 | return; | |
79 | } | |
80 | ||
81 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); | |
997d0030 | 82 | local_flush_tlb_one(get_asid(), addr); |
07cad4dc MF |
83 | |
84 | if (pgprot_val(prot) & _PAGE_WIRED) | |
85 | tlb_wire_entry(NULL, addr, *pte); | |
86 | } | |
87 | ||
88 | static void clear_pte_phys(unsigned long addr, pgprot_t prot) | |
89 | { | |
90 | pte_t *pte; | |
91 | ||
92 | pte = __get_pte_phys(addr); | |
93 | ||
94 | if (pgprot_val(prot) & _PAGE_WIRED) | |
95 | tlb_unwire_entry(); | |
96 | ||
97 | set_pte(pte, pfn_pte(0, __pgprot(0))); | |
98 | local_flush_tlb_one(get_asid(), addr); | |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 LT |
101 | void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
102 | { | |
103 | unsigned long address = __fix_to_virt(idx); | |
104 | ||
105 | if (idx >= __end_of_fixed_addresses) { | |
106 | BUG(); | |
107 | return; | |
108 | } | |
109 | ||
110 | set_pte_phys(address, phys, prot); | |
111 | } | |
2adb4e10 | 112 | |
07cad4dc MF |
113 | void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) |
114 | { | |
115 | unsigned long address = __fix_to_virt(idx); | |
116 | ||
117 | if (idx >= __end_of_fixed_addresses) { | |
118 | BUG(); | |
119 | return; | |
120 | } | |
121 | ||
122 | clear_pte_phys(address, prot); | |
123 | } | |
124 | ||
2adb4e10 SM |
125 | void __init page_table_range_init(unsigned long start, unsigned long end, |
126 | pgd_t *pgd_base) | |
127 | { | |
128 | pgd_t *pgd; | |
129 | pud_t *pud; | |
130 | pmd_t *pmd; | |
0906a3ad PM |
131 | pte_t *pte; |
132 | int i, j, k; | |
2adb4e10 SM |
133 | unsigned long vaddr; |
134 | ||
0906a3ad PM |
135 | vaddr = start; |
136 | i = __pgd_offset(vaddr); | |
137 | j = __pud_offset(vaddr); | |
138 | k = __pmd_offset(vaddr); | |
139 | pgd = pgd_base + i; | |
140 | ||
141 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
142 | pud = (pud_t *)pgd; | |
143 | for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { | |
5d9b4b19 | 144 | #ifdef __PAGETABLE_PMD_FOLDED |
0906a3ad | 145 | pmd = (pmd_t *)pud; |
5d9b4b19 MF |
146 | #else |
147 | pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
148 | pud_populate(&init_mm, pud, pmd); | |
149 | pmd += k; | |
150 | #endif | |
0906a3ad PM |
151 | for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { |
152 | if (pmd_none(*pmd)) { | |
153 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
154 | pmd_populate_kernel(&init_mm, pmd, pte); | |
155 | BUG_ON(pte != pte_offset_kernel(pmd, 0)); | |
156 | } | |
157 | vaddr += PMD_SIZE; | |
158 | } | |
159 | k = 0; | |
2adb4e10 | 160 | } |
0906a3ad | 161 | j = 0; |
2adb4e10 SM |
162 | } |
163 | } | |
11cbb70e | 164 | #endif /* CONFIG_MMU */ |
1da177e4 | 165 | |
1da177e4 LT |
166 | /* |
167 | * paging_init() sets up the page tables | |
1da177e4 LT |
168 | */ |
169 | void __init paging_init(void) | |
170 | { | |
2de212eb | 171 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
0906a3ad | 172 | unsigned long vaddr, end; |
01066625 | 173 | int nid; |
1da177e4 | 174 | |
01066625 PM |
175 | /* We don't need to map the kernel through the TLB, as |
176 | * it is permanatly mapped using P1. So clear the | |
177 | * entire pgd. */ | |
178 | memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); | |
1da177e4 | 179 | |
6e4662ff SM |
180 | /* Set an initial value for the MMU.TTB so we don't have to |
181 | * check for a null value. */ | |
182 | set_TTB(swapper_pg_dir); | |
183 | ||
acca4f4d PM |
184 | /* |
185 | * Populate the relevant portions of swapper_pg_dir so that | |
2adb4e10 | 186 | * we can use the fixmap entries without calling kmalloc. |
acca4f4d PM |
187 | * pte's will be filled in by __set_fixmap(). |
188 | */ | |
189 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
0906a3ad PM |
190 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
191 | page_table_range_init(vaddr, end, swapper_pg_dir); | |
acca4f4d PM |
192 | |
193 | kmap_coherent_init(); | |
2adb4e10 | 194 | |
2de212eb PM |
195 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
196 | ||
01066625 PM |
197 | for_each_online_node(nid) { |
198 | pg_data_t *pgdat = NODE_DATA(nid); | |
01066625 PM |
199 | unsigned long low, start_pfn; |
200 | ||
3560e249 | 201 | start_pfn = pgdat->bdata->node_min_pfn; |
01066625 PM |
202 | low = pgdat->bdata->node_low_pfn; |
203 | ||
2de212eb PM |
204 | if (max_zone_pfns[ZONE_NORMAL] < low) |
205 | max_zone_pfns[ZONE_NORMAL] = low; | |
01066625 PM |
206 | |
207 | printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", | |
208 | nid, start_pfn, low); | |
01066625 | 209 | } |
2de212eb PM |
210 | |
211 | free_area_init_nodes(max_zone_pfns); | |
cbaa118e SM |
212 | |
213 | /* Set up the uncached fixmap */ | |
214 | set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start)); | |
1da177e4 LT |
215 | } |
216 | ||
94c28510 PM |
217 | /* |
218 | * Early initialization for any I/O MMUs we might have. | |
219 | */ | |
220 | static void __init iommu_init(void) | |
221 | { | |
222 | no_iommu_init(); | |
223 | } | |
224 | ||
d9b9487a PM |
225 | unsigned int mem_init_done = 0; |
226 | ||
1da177e4 LT |
227 | void __init mem_init(void) |
228 | { | |
dfbb9042 | 229 | int codesize, datasize, initsize; |
01066625 | 230 | int nid; |
1da177e4 | 231 | |
94c28510 PM |
232 | iommu_init(); |
233 | ||
2de212eb PM |
234 | num_physpages = 0; |
235 | high_memory = NULL; | |
236 | ||
01066625 PM |
237 | for_each_online_node(nid) { |
238 | pg_data_t *pgdat = NODE_DATA(nid); | |
239 | unsigned long node_pages = 0; | |
240 | void *node_high_memory; | |
01066625 PM |
241 | |
242 | num_physpages += pgdat->node_present_pages; | |
243 | ||
244 | if (pgdat->node_spanned_pages) | |
245 | node_pages = free_all_bootmem_node(pgdat); | |
246 | ||
247 | totalram_pages += node_pages; | |
1da177e4 | 248 | |
2de212eb PM |
249 | node_high_memory = (void *)__va((pgdat->node_start_pfn + |
250 | pgdat->node_spanned_pages) << | |
251 | PAGE_SHIFT); | |
01066625 PM |
252 | if (node_high_memory > high_memory) |
253 | high_memory = node_high_memory; | |
254 | } | |
1da177e4 | 255 | |
37443ef3 PM |
256 | /* Set this up early, so we can take care of the zero page */ |
257 | cpu_cache_init(); | |
258 | ||
1da177e4 LT |
259 | /* clear the zero-page */ |
260 | memset(empty_zero_page, 0, PAGE_SIZE); | |
261 | __flush_wback_region(empty_zero_page, PAGE_SIZE); | |
262 | ||
1da177e4 LT |
263 | codesize = (unsigned long) &_etext - (unsigned long) &_text; |
264 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
265 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
266 | ||
2cb7ce3b | 267 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " |
dfbb9042 | 268 | "%dk data, %dk init)\n", |
cc013a88 | 269 | nr_free_pages() << (PAGE_SHIFT-10), |
2de212eb | 270 | num_physpages << (PAGE_SHIFT-10), |
1da177e4 | 271 | codesize >> 10, |
1da177e4 LT |
272 | datasize >> 10, |
273 | initsize >> 10); | |
274 | ||
19f9a34f PM |
275 | /* Initialize the vDSO */ |
276 | vsyscall_init(); | |
d9b9487a PM |
277 | |
278 | mem_init_done = 1; | |
1da177e4 LT |
279 | } |
280 | ||
281 | void free_initmem(void) | |
282 | { | |
283 | unsigned long addr; | |
65463b73 | 284 | |
1da177e4 LT |
285 | addr = (unsigned long)(&__init_begin); |
286 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
287 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 288 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
289 | free_page(addr); |
290 | totalram_pages++; | |
291 | } | |
07cbb41b PM |
292 | printk("Freeing unused kernel memory: %ldk freed\n", |
293 | ((unsigned long)&__init_end - | |
294 | (unsigned long)&__init_begin) >> 10); | |
1da177e4 LT |
295 | } |
296 | ||
297 | #ifdef CONFIG_BLK_DEV_INITRD | |
298 | void free_initrd_mem(unsigned long start, unsigned long end) | |
299 | { | |
300 | unsigned long p; | |
301 | for (p = start; p < end; p += PAGE_SIZE) { | |
302 | ClearPageReserved(virt_to_page(p)); | |
7835e98b | 303 | init_page_count(virt_to_page(p)); |
1da177e4 LT |
304 | free_page(p); |
305 | totalram_pages++; | |
306 | } | |
2de212eb | 307 | printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); |
1da177e4 LT |
308 | } |
309 | #endif | |
33d63bd8 PM |
310 | |
311 | #ifdef CONFIG_MEMORY_HOTPLUG | |
33d63bd8 PM |
312 | int arch_add_memory(int nid, u64 start, u64 size) |
313 | { | |
314 | pg_data_t *pgdat; | |
315 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
316 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
317 | int ret; | |
318 | ||
319 | pgdat = NODE_DATA(nid); | |
320 | ||
321 | /* We only have ZONE_NORMAL, so this is easy.. */ | |
c04fc586 GH |
322 | ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL, |
323 | start_pfn, nr_pages); | |
33d63bd8 | 324 | if (unlikely(ret)) |
866e6b9e | 325 | printk("%s: Failed, __add_pages() == %d\n", __func__, ret); |
33d63bd8 PM |
326 | |
327 | return ret; | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(arch_add_memory); | |
330 | ||
357d5946 | 331 | #ifdef CONFIG_NUMA |
33d63bd8 PM |
332 | int memory_add_physaddr_to_nid(u64 addr) |
333 | { | |
334 | /* Node 0 for now.. */ | |
335 | return 0; | |
336 | } | |
337 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); | |
338 | #endif | |
1f69b6af | 339 | |
3159e7d6 | 340 | #endif /* CONFIG_MEMORY_HOTPLUG */ |