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a95d0e16 MS |
1 | /* |
2 | * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu> | |
3 | * Copyright (C) 2006 Atmark Techno, Inc. | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | */ | |
9 | ||
57c8a661 | 10 | #include <linux/memblock.h> |
a95d0e16 MS |
11 | #include <linux/init.h> |
12 | #include <linux/kernel.h> | |
a95d0e16 MS |
13 | #include <linux/mm.h> /* mem_init */ |
14 | #include <linux/initrd.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/pfn.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
a95d0e16 | 18 | #include <linux/swap.h> |
66421a64 | 19 | #include <linux/export.h> |
a95d0e16 MS |
20 | |
21 | #include <asm/page.h> | |
22 | #include <asm/mmu_context.h> | |
23 | #include <asm/pgalloc.h> | |
24 | #include <asm/sections.h> | |
25 | #include <asm/tlb.h> | |
41938761 | 26 | #include <asm/fixmap.h> |
a95d0e16 | 27 | |
79bf3a13 MS |
28 | /* Use for MMU and noMMU because of PCI generic code */ |
29 | int mem_init_done; | |
30 | ||
4dc60832 | 31 | #ifndef CONFIG_MMU |
a95d0e16 | 32 | unsigned int __page_offset; |
5af7fa68 | 33 | EXPORT_SYMBOL(__page_offset); |
4dc60832 MS |
34 | #endif /* CONFIG_MMU */ |
35 | ||
a95d0e16 MS |
36 | char *klimit = _end; |
37 | ||
38 | /* | |
39 | * Initialize the bootmem system and give it all the memory we | |
40 | * have available. | |
41 | */ | |
4dc60832 | 42 | unsigned long memory_start; |
fd6ed51f | 43 | EXPORT_SYMBOL(memory_start); |
4dc60832 | 44 | unsigned long memory_size; |
ee4bcdf1 | 45 | EXPORT_SYMBOL(memory_size); |
83a92529 | 46 | unsigned long lowmem_size; |
a95d0e16 | 47 | |
2f2f371f MS |
48 | #ifdef CONFIG_HIGHMEM |
49 | pte_t *kmap_pte; | |
50 | EXPORT_SYMBOL(kmap_pte); | |
51 | pgprot_t kmap_prot; | |
52 | EXPORT_SYMBOL(kmap_prot); | |
53 | ||
54 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
55 | { | |
56 | return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), | |
57 | vaddr), vaddr); | |
58 | } | |
59 | ||
60 | static void __init highmem_init(void) | |
61 | { | |
62 | pr_debug("%x\n", (u32)PKMAP_BASE); | |
63 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
64 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); | |
65 | ||
66 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
67 | kmap_prot = PAGE_KERNEL; | |
68 | } | |
69 | ||
6879ea83 | 70 | static void highmem_setup(void) |
2f2f371f MS |
71 | { |
72 | unsigned long pfn; | |
2f2f371f MS |
73 | |
74 | for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) { | |
75 | struct page *page = pfn_to_page(pfn); | |
76 | ||
77 | /* FIXME not sure about */ | |
6879ea83 JL |
78 | if (!memblock_is_reserved(pfn << PAGE_SHIFT)) |
79 | free_highmem_page(page); | |
2f2f371f | 80 | } |
2f2f371f MS |
81 | } |
82 | #endif /* CONFIG_HIGHMEM */ | |
83 | ||
a95d0e16 MS |
84 | /* |
85 | * paging_init() sets up the page tables - in fact we've already done this. | |
86 | */ | |
87 | static void __init paging_init(void) | |
88 | { | |
a95d0e16 | 89 | unsigned long zones_size[MAX_NR_ZONES]; |
41938761 MS |
90 | #ifdef CONFIG_MMU |
91 | int idx; | |
92 | ||
93 | /* Setup fixmaps */ | |
94 | for (idx = 0; idx < __end_of_fixed_addresses; idx++) | |
95 | clear_fixmap(idx); | |
96 | #endif | |
a95d0e16 | 97 | |
5af90438 SM |
98 | /* Clean every zones */ |
99 | memset(zones_size, 0, sizeof(zones_size)); | |
100 | ||
2f2f371f MS |
101 | #ifdef CONFIG_HIGHMEM |
102 | highmem_init(); | |
103 | ||
104 | zones_size[ZONE_DMA] = max_low_pfn; | |
105 | zones_size[ZONE_HIGHMEM] = max_pfn; | |
106 | #else | |
83a92529 | 107 | zones_size[ZONE_DMA] = max_pfn; |
2f2f371f | 108 | #endif |
a95d0e16 | 109 | |
baab8a82 MS |
110 | /* We don't have holes in memory map */ |
111 | free_area_init_nodes(zones_size); | |
a95d0e16 MS |
112 | } |
113 | ||
114 | void __init setup_memory(void) | |
115 | { | |
76bfcc81 BH |
116 | struct memblock_region *reg; |
117 | ||
4dc60832 | 118 | #ifndef CONFIG_MMU |
a95d0e16 MS |
119 | u32 kernel_align_start, kernel_align_size; |
120 | ||
121 | /* Find main memory where is the kernel */ | |
76bfcc81 BH |
122 | for_each_memblock(memory, reg) { |
123 | memory_start = (u32)reg->base; | |
83a92529 | 124 | lowmem_size = reg->size; |
a95d0e16 | 125 | if ((memory_start <= (u32)_text) && |
83a92529 MS |
126 | ((u32)_text <= (memory_start + lowmem_size - 1))) { |
127 | memory_size = lowmem_size; | |
a95d0e16 | 128 | PAGE_OFFSET = memory_start; |
6bd55f0b MS |
129 | pr_info("%s: Main mem: 0x%x, size 0x%08x\n", |
130 | __func__, (u32) memory_start, | |
83a92529 | 131 | (u32) memory_size); |
a95d0e16 MS |
132 | break; |
133 | } | |
134 | } | |
135 | ||
83a92529 MS |
136 | if (!memory_start || !memory_size) { |
137 | panic("%s: Missing memory setting 0x%08x, size=0x%08x\n", | |
138 | __func__, (u32) memory_start, (u32) memory_size); | |
a95d0e16 MS |
139 | } |
140 | ||
141 | /* reservation of region where is the kernel */ | |
142 | kernel_align_start = PAGE_DOWN((u32)_text); | |
143 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ | |
144 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; | |
6bd55f0b | 145 | pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n", |
a95d0e16 MS |
146 | __func__, kernel_align_start, kernel_align_start |
147 | + kernel_align_size, kernel_align_size); | |
83a92529 | 148 | memblock_reserve(kernel_align_start, kernel_align_size); |
4dc60832 | 149 | #endif |
a95d0e16 MS |
150 | /* |
151 | * Kernel: | |
152 | * start: base phys address of kernel - page align | |
153 | * end: base phys address of kernel - page align | |
154 | * | |
155 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) | |
156 | * max_low_pfn | |
157 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) | |
a95d0e16 MS |
158 | */ |
159 | ||
160 | /* memory start is from the kernel end (aligned) to higher addr */ | |
161 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ | |
162 | /* RAM is assumed contiguous */ | |
6879ea83 | 163 | max_mapnr = memory_size >> PAGE_SHIFT; |
83a92529 MS |
164 | max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; |
165 | max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; | |
a95d0e16 | 166 | |
6bd55f0b MS |
167 | pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
168 | pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); | |
169 | pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); | |
170 | pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); | |
a95d0e16 | 171 | |
baab8a82 MS |
172 | /* Add active regions with valid PFNs */ |
173 | for_each_memblock(memory, reg) { | |
174 | unsigned long start_pfn, end_pfn; | |
175 | ||
176 | start_pfn = memblock_region_memory_base_pfn(reg); | |
177 | end_pfn = memblock_region_memory_end_pfn(reg); | |
178 | memblock_set_node(start_pfn << PAGE_SHIFT, | |
e7e8de59 TC |
179 | (end_pfn - start_pfn) << PAGE_SHIFT, |
180 | &memblock.memory, 0); | |
baab8a82 MS |
181 | } |
182 | ||
baab8a82 MS |
183 | /* XXX need to clip this if using highmem? */ |
184 | sparse_memory_present_with_active_regions(0); | |
185 | ||
a95d0e16 MS |
186 | paging_init(); |
187 | } | |
188 | ||
a95d0e16 MS |
189 | #ifdef CONFIG_BLK_DEV_INITRD |
190 | void free_initrd_mem(unsigned long start, unsigned long end) | |
191 | { | |
dbe67df4 | 192 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
a95d0e16 MS |
193 | } |
194 | #endif | |
195 | ||
196 | void free_initmem(void) | |
197 | { | |
dbe67df4 | 198 | free_initmem_default(-1); |
a95d0e16 MS |
199 | } |
200 | ||
a95d0e16 MS |
201 | void __init mem_init(void) |
202 | { | |
83a92529 MS |
203 | high_memory = (void *)__va(memory_start + lowmem_size - 1); |
204 | ||
a95d0e16 | 205 | /* this will put all memory onto the freelists */ |
c6ffc5ca | 206 | memblock_free_all(); |
2f2f371f | 207 | #ifdef CONFIG_HIGHMEM |
6879ea83 | 208 | highmem_setup(); |
2f2f371f MS |
209 | #endif |
210 | ||
6879ea83 | 211 | mem_init_print_info(NULL); |
83299799 MS |
212 | #ifdef CONFIG_MMU |
213 | pr_info("Kernel virtual memory layout:\n"); | |
214 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
2f2f371f MS |
215 | #ifdef CONFIG_HIGHMEM |
216 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
217 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
218 | #endif /* CONFIG_HIGHMEM */ | |
83299799 MS |
219 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
220 | ioremap_bot, ioremap_base); | |
221 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
222 | (unsigned long)VMALLOC_START, VMALLOC_END); | |
223 | #endif | |
4dc60832 | 224 | mem_init_done = 1; |
a95d0e16 MS |
225 | } |
226 | ||
4dc60832 | 227 | #ifndef CONFIG_MMU |
79bf3a13 MS |
228 | int page_is_ram(unsigned long pfn) |
229 | { | |
230 | return __range_ok(pfn, 0); | |
231 | } | |
4dc60832 MS |
232 | #else |
233 | int page_is_ram(unsigned long pfn) | |
234 | { | |
235 | return pfn < max_low_pfn; | |
236 | } | |
237 | ||
238 | /* | |
239 | * Check for command-line options that affect what MMU_init will do. | |
240 | */ | |
241 | static void mm_cmdline_setup(void) | |
242 | { | |
243 | unsigned long maxmem = 0; | |
244 | char *p = cmd_line; | |
245 | ||
246 | /* Look for mem= option on command line */ | |
247 | p = strstr(cmd_line, "mem="); | |
248 | if (p) { | |
249 | p += 4; | |
250 | maxmem = memparse(p, &p); | |
251 | if (maxmem && memory_size > maxmem) { | |
252 | memory_size = maxmem; | |
da5ab11c | 253 | memblock.memory.regions[0].size = memory_size; |
4dc60832 MS |
254 | } |
255 | } | |
256 | } | |
257 | ||
258 | /* | |
259 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. | |
260 | */ | |
261 | static void __init mmu_init_hw(void) | |
262 | { | |
263 | /* | |
264 | * The Zone Protection Register (ZPR) defines how protection will | |
265 | * be applied to every page which is a member of a given zone. At | |
266 | * present, we utilize only two of the zones. | |
267 | * The zone index bits (of ZSEL) in the PTE are used for software | |
268 | * indicators, except the LSB. For user access, zone 1 is used, | |
269 | * for kernel access, zone 0 is used. We set all but zone 1 | |
270 | * to zero, allowing only kernel access as indicated in the PTE. | |
271 | * For zone 1, we set a 01 binary (a value of 10 will not work) | |
272 | * to allow user access as indicated in the PTE. This also allows | |
273 | * kernel access as indicated in the PTE. | |
274 | */ | |
275 | __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ | |
276 | "mts rzpr, r11;" | |
277 | : : : "r11"); | |
278 | } | |
279 | ||
280 | /* | |
281 | * MMU_init sets up the basic memory mappings for the kernel, | |
282 | * including both RAM and possibly some I/O regions, | |
283 | * and sets up the page tables and the MMU hardware ready to go. | |
284 | */ | |
285 | ||
286 | /* called from head.S */ | |
287 | asmlinkage void __init mmu_init(void) | |
288 | { | |
289 | unsigned int kstart, ksize; | |
290 | ||
95f72d1e | 291 | if (!memblock.reserved.cnt) { |
6bd55f0b | 292 | pr_emerg("Error memory count\n"); |
4dc60832 MS |
293 | machine_restart(NULL); |
294 | } | |
295 | ||
95b0f9ea | 296 | if ((u32) memblock.memory.regions[0].size < 0x400000) { |
6bd55f0b | 297 | pr_emerg("Memory must be greater than 4MB\n"); |
4dc60832 MS |
298 | machine_restart(NULL); |
299 | } | |
95b0f9ea MS |
300 | |
301 | if ((u32) memblock.memory.regions[0].size < kernel_tlb) { | |
6bd55f0b | 302 | pr_emerg("Kernel size is greater than memory node\n"); |
95b0f9ea MS |
303 | machine_restart(NULL); |
304 | } | |
305 | ||
4dc60832 | 306 | /* Find main memory where the kernel is */ |
da5ab11c | 307 | memory_start = (u32) memblock.memory.regions[0].base; |
83a92529 MS |
308 | lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; |
309 | ||
310 | if (lowmem_size > CONFIG_LOWMEM_SIZE) { | |
311 | lowmem_size = CONFIG_LOWMEM_SIZE; | |
2f2f371f | 312 | #ifndef CONFIG_HIGHMEM |
83a92529 | 313 | memory_size = lowmem_size; |
2f2f371f | 314 | #endif |
83a92529 | 315 | } |
4dc60832 MS |
316 | |
317 | mm_cmdline_setup(); /* FIXME parse args from command line - not used */ | |
318 | ||
319 | /* | |
320 | * Map out the kernel text/data/bss from the available physical | |
321 | * memory. | |
322 | */ | |
323 | kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ | |
324 | /* kernel size */ | |
325 | ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); | |
95f72d1e | 326 | memblock_reserve(kstart, ksize); |
4dc60832 MS |
327 | |
328 | #if defined(CONFIG_BLK_DEV_INITRD) | |
329 | /* Remove the init RAM disk from the available memory. */ | |
5eec2f02 MS |
330 | if (initrd_start) { |
331 | unsigned long size; | |
332 | size = initrd_end - initrd_start; | |
a66a6265 | 333 | memblock_reserve(__virt_to_phys(initrd_start), size); |
5eec2f02 | 334 | } |
4dc60832 MS |
335 | #endif /* CONFIG_BLK_DEV_INITRD */ |
336 | ||
337 | /* Initialize the MMU hardware */ | |
338 | mmu_init_hw(); | |
339 | ||
340 | /* Map in all of RAM starting at CONFIG_KERNEL_START */ | |
341 | mapin_ram(); | |
342 | ||
41938761 | 343 | /* Extend vmalloc and ioremap area as big as possible */ |
2f2f371f MS |
344 | #ifdef CONFIG_HIGHMEM |
345 | ioremap_base = ioremap_bot = PKMAP_BASE; | |
346 | #else | |
41938761 | 347 | ioremap_base = ioremap_bot = FIXADDR_START; |
2f2f371f | 348 | #endif |
41938761 | 349 | |
4dc60832 MS |
350 | /* Initialize the context management stuff */ |
351 | mmu_context_init(); | |
83a92529 MS |
352 | |
353 | /* Shortly after that, the entire linear mapping will be available */ | |
354 | /* This will also cause that unflatten device tree will be allocated | |
355 | * inside 768MB limit */ | |
356 | memblock_set_current_limit(memory_start + lowmem_size - 1); | |
4dc60832 MS |
357 | } |
358 | ||
359 | /* This is only called until mem_init is done. */ | |
360 | void __init *early_get_page(void) | |
361 | { | |
101646a2 RH |
362 | /* |
363 | * Mem start + kernel_tlb -> here is limit | |
364 | * because of mem mapping from head.S | |
365 | */ | |
366 | return __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, | |
367 | memory_start + kernel_tlb)); | |
4dc60832 | 368 | } |
a84642a3 | 369 | |
79bf3a13 MS |
370 | #endif /* CONFIG_MMU */ |
371 | ||
bd721ea7 | 372 | void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) |
a84642a3 MS |
373 | { |
374 | void *p; | |
375 | ||
376 | if (mem_init_done) | |
377 | p = kzalloc(size, mask); | |
378 | else { | |
7e1c4e27 | 379 | p = memblock_alloc(size, SMP_CACHE_BYTES); |
a84642a3 MS |
380 | if (p) |
381 | memset(p, 0, size); | |
382 | } | |
383 | return p; | |
384 | } |