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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 | ||
10 | #include <linux/bootmem.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
95f72d1e | 13 | #include <linux/memblock.h> |
a95d0e16 MS |
14 | #include <linux/mm.h> /* mem_init */ |
15 | #include <linux/initrd.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/pfn.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
a95d0e16 | 19 | #include <linux/swap.h> |
66421a64 | 20 | #include <linux/export.h> |
a95d0e16 MS |
21 | |
22 | #include <asm/page.h> | |
23 | #include <asm/mmu_context.h> | |
24 | #include <asm/pgalloc.h> | |
25 | #include <asm/sections.h> | |
26 | #include <asm/tlb.h> | |
41938761 | 27 | #include <asm/fixmap.h> |
a95d0e16 | 28 | |
79bf3a13 MS |
29 | /* Use for MMU and noMMU because of PCI generic code */ |
30 | int mem_init_done; | |
31 | ||
4dc60832 | 32 | #ifndef CONFIG_MMU |
a95d0e16 | 33 | unsigned int __page_offset; |
5af7fa68 | 34 | EXPORT_SYMBOL(__page_offset); |
4dc60832 MS |
35 | #endif /* CONFIG_MMU */ |
36 | ||
a95d0e16 MS |
37 | char *klimit = _end; |
38 | ||
39 | /* | |
40 | * Initialize the bootmem system and give it all the memory we | |
41 | * have available. | |
42 | */ | |
4dc60832 | 43 | unsigned long memory_start; |
fd6ed51f | 44 | EXPORT_SYMBOL(memory_start); |
4dc60832 | 45 | unsigned long memory_size; |
ee4bcdf1 | 46 | EXPORT_SYMBOL(memory_size); |
83a92529 | 47 | unsigned long lowmem_size; |
a95d0e16 | 48 | |
2f2f371f MS |
49 | #ifdef CONFIG_HIGHMEM |
50 | pte_t *kmap_pte; | |
51 | EXPORT_SYMBOL(kmap_pte); | |
52 | pgprot_t kmap_prot; | |
53 | EXPORT_SYMBOL(kmap_prot); | |
54 | ||
55 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
56 | { | |
57 | return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), | |
58 | vaddr), vaddr); | |
59 | } | |
60 | ||
61 | static void __init highmem_init(void) | |
62 | { | |
63 | pr_debug("%x\n", (u32)PKMAP_BASE); | |
64 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
65 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); | |
66 | ||
67 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
68 | kmap_prot = PAGE_KERNEL; | |
69 | } | |
70 | ||
6879ea83 | 71 | static void highmem_setup(void) |
2f2f371f MS |
72 | { |
73 | unsigned long pfn; | |
2f2f371f MS |
74 | |
75 | for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) { | |
76 | struct page *page = pfn_to_page(pfn); | |
77 | ||
78 | /* FIXME not sure about */ | |
6879ea83 JL |
79 | if (!memblock_is_reserved(pfn << PAGE_SHIFT)) |
80 | free_highmem_page(page); | |
2f2f371f | 81 | } |
2f2f371f MS |
82 | } |
83 | #endif /* CONFIG_HIGHMEM */ | |
84 | ||
a95d0e16 MS |
85 | /* |
86 | * paging_init() sets up the page tables - in fact we've already done this. | |
87 | */ | |
88 | static void __init paging_init(void) | |
89 | { | |
a95d0e16 | 90 | unsigned long zones_size[MAX_NR_ZONES]; |
41938761 MS |
91 | #ifdef CONFIG_MMU |
92 | int idx; | |
93 | ||
94 | /* Setup fixmaps */ | |
95 | for (idx = 0; idx < __end_of_fixed_addresses; idx++) | |
96 | clear_fixmap(idx); | |
97 | #endif | |
a95d0e16 | 98 | |
5af90438 SM |
99 | /* Clean every zones */ |
100 | memset(zones_size, 0, sizeof(zones_size)); | |
101 | ||
2f2f371f MS |
102 | #ifdef CONFIG_HIGHMEM |
103 | highmem_init(); | |
104 | ||
105 | zones_size[ZONE_DMA] = max_low_pfn; | |
106 | zones_size[ZONE_HIGHMEM] = max_pfn; | |
107 | #else | |
83a92529 | 108 | zones_size[ZONE_DMA] = max_pfn; |
2f2f371f | 109 | #endif |
a95d0e16 | 110 | |
baab8a82 MS |
111 | /* We don't have holes in memory map */ |
112 | free_area_init_nodes(zones_size); | |
a95d0e16 MS |
113 | } |
114 | ||
115 | void __init setup_memory(void) | |
116 | { | |
76bfcc81 BH |
117 | struct memblock_region *reg; |
118 | ||
4dc60832 | 119 | #ifndef CONFIG_MMU |
a95d0e16 MS |
120 | u32 kernel_align_start, kernel_align_size; |
121 | ||
122 | /* Find main memory where is the kernel */ | |
76bfcc81 BH |
123 | for_each_memblock(memory, reg) { |
124 | memory_start = (u32)reg->base; | |
83a92529 | 125 | lowmem_size = reg->size; |
a95d0e16 | 126 | if ((memory_start <= (u32)_text) && |
83a92529 MS |
127 | ((u32)_text <= (memory_start + lowmem_size - 1))) { |
128 | memory_size = lowmem_size; | |
a95d0e16 | 129 | PAGE_OFFSET = memory_start; |
6bd55f0b MS |
130 | pr_info("%s: Main mem: 0x%x, size 0x%08x\n", |
131 | __func__, (u32) memory_start, | |
83a92529 | 132 | (u32) memory_size); |
a95d0e16 MS |
133 | break; |
134 | } | |
135 | } | |
136 | ||
83a92529 MS |
137 | if (!memory_start || !memory_size) { |
138 | panic("%s: Missing memory setting 0x%08x, size=0x%08x\n", | |
139 | __func__, (u32) memory_start, (u32) memory_size); | |
a95d0e16 MS |
140 | } |
141 | ||
142 | /* reservation of region where is the kernel */ | |
143 | kernel_align_start = PAGE_DOWN((u32)_text); | |
144 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ | |
145 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; | |
6bd55f0b | 146 | pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n", |
a95d0e16 MS |
147 | __func__, kernel_align_start, kernel_align_start |
148 | + kernel_align_size, kernel_align_size); | |
83a92529 | 149 | memblock_reserve(kernel_align_start, kernel_align_size); |
4dc60832 | 150 | #endif |
a95d0e16 MS |
151 | /* |
152 | * Kernel: | |
153 | * start: base phys address of kernel - page align | |
154 | * end: base phys address of kernel - page align | |
155 | * | |
156 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) | |
157 | * max_low_pfn | |
158 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) | |
a95d0e16 MS |
159 | */ |
160 | ||
161 | /* memory start is from the kernel end (aligned) to higher addr */ | |
162 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ | |
163 | /* RAM is assumed contiguous */ | |
6879ea83 | 164 | max_mapnr = memory_size >> PAGE_SHIFT; |
83a92529 MS |
165 | max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; |
166 | max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; | |
a95d0e16 | 167 | |
6bd55f0b MS |
168 | pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
169 | pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); | |
170 | pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); | |
171 | pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); | |
a95d0e16 | 172 | |
baab8a82 MS |
173 | /* Add active regions with valid PFNs */ |
174 | for_each_memblock(memory, reg) { | |
175 | unsigned long start_pfn, end_pfn; | |
176 | ||
177 | start_pfn = memblock_region_memory_base_pfn(reg); | |
178 | end_pfn = memblock_region_memory_end_pfn(reg); | |
179 | memblock_set_node(start_pfn << PAGE_SHIFT, | |
e7e8de59 TC |
180 | (end_pfn - start_pfn) << PAGE_SHIFT, |
181 | &memblock.memory, 0); | |
baab8a82 MS |
182 | } |
183 | ||
baab8a82 MS |
184 | /* XXX need to clip this if using highmem? */ |
185 | sparse_memory_present_with_active_regions(0); | |
186 | ||
a95d0e16 MS |
187 | paging_init(); |
188 | } | |
189 | ||
a95d0e16 MS |
190 | #ifdef CONFIG_BLK_DEV_INITRD |
191 | void free_initrd_mem(unsigned long start, unsigned long end) | |
192 | { | |
dbe67df4 | 193 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
a95d0e16 MS |
194 | } |
195 | #endif | |
196 | ||
197 | void free_initmem(void) | |
198 | { | |
dbe67df4 | 199 | free_initmem_default(-1); |
a95d0e16 MS |
200 | } |
201 | ||
a95d0e16 MS |
202 | void __init mem_init(void) |
203 | { | |
83a92529 MS |
204 | high_memory = (void *)__va(memory_start + lowmem_size - 1); |
205 | ||
a95d0e16 | 206 | /* this will put all memory onto the freelists */ |
0c988534 | 207 | free_all_bootmem(); |
2f2f371f | 208 | #ifdef CONFIG_HIGHMEM |
6879ea83 | 209 | highmem_setup(); |
2f2f371f MS |
210 | #endif |
211 | ||
6879ea83 | 212 | mem_init_print_info(NULL); |
83299799 MS |
213 | #ifdef CONFIG_MMU |
214 | pr_info("Kernel virtual memory layout:\n"); | |
215 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
2f2f371f MS |
216 | #ifdef CONFIG_HIGHMEM |
217 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
218 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
219 | #endif /* CONFIG_HIGHMEM */ | |
83299799 MS |
220 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
221 | ioremap_bot, ioremap_base); | |
222 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
223 | (unsigned long)VMALLOC_START, VMALLOC_END); | |
224 | #endif | |
4dc60832 | 225 | mem_init_done = 1; |
a95d0e16 MS |
226 | } |
227 | ||
4dc60832 | 228 | #ifndef CONFIG_MMU |
79bf3a13 MS |
229 | int page_is_ram(unsigned long pfn) |
230 | { | |
231 | return __range_ok(pfn, 0); | |
232 | } | |
4dc60832 MS |
233 | #else |
234 | int page_is_ram(unsigned long pfn) | |
235 | { | |
236 | return pfn < max_low_pfn; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Check for command-line options that affect what MMU_init will do. | |
241 | */ | |
242 | static void mm_cmdline_setup(void) | |
243 | { | |
244 | unsigned long maxmem = 0; | |
245 | char *p = cmd_line; | |
246 | ||
247 | /* Look for mem= option on command line */ | |
248 | p = strstr(cmd_line, "mem="); | |
249 | if (p) { | |
250 | p += 4; | |
251 | maxmem = memparse(p, &p); | |
252 | if (maxmem && memory_size > maxmem) { | |
253 | memory_size = maxmem; | |
da5ab11c | 254 | memblock.memory.regions[0].size = memory_size; |
4dc60832 MS |
255 | } |
256 | } | |
257 | } | |
258 | ||
259 | /* | |
260 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. | |
261 | */ | |
262 | static void __init mmu_init_hw(void) | |
263 | { | |
264 | /* | |
265 | * The Zone Protection Register (ZPR) defines how protection will | |
266 | * be applied to every page which is a member of a given zone. At | |
267 | * present, we utilize only two of the zones. | |
268 | * The zone index bits (of ZSEL) in the PTE are used for software | |
269 | * indicators, except the LSB. For user access, zone 1 is used, | |
270 | * for kernel access, zone 0 is used. We set all but zone 1 | |
271 | * to zero, allowing only kernel access as indicated in the PTE. | |
272 | * For zone 1, we set a 01 binary (a value of 10 will not work) | |
273 | * to allow user access as indicated in the PTE. This also allows | |
274 | * kernel access as indicated in the PTE. | |
275 | */ | |
276 | __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ | |
277 | "mts rzpr, r11;" | |
278 | : : : "r11"); | |
279 | } | |
280 | ||
281 | /* | |
282 | * MMU_init sets up the basic memory mappings for the kernel, | |
283 | * including both RAM and possibly some I/O regions, | |
284 | * and sets up the page tables and the MMU hardware ready to go. | |
285 | */ | |
286 | ||
287 | /* called from head.S */ | |
288 | asmlinkage void __init mmu_init(void) | |
289 | { | |
290 | unsigned int kstart, ksize; | |
291 | ||
95f72d1e | 292 | if (!memblock.reserved.cnt) { |
6bd55f0b | 293 | pr_emerg("Error memory count\n"); |
4dc60832 MS |
294 | machine_restart(NULL); |
295 | } | |
296 | ||
95b0f9ea | 297 | if ((u32) memblock.memory.regions[0].size < 0x400000) { |
6bd55f0b | 298 | pr_emerg("Memory must be greater than 4MB\n"); |
4dc60832 MS |
299 | machine_restart(NULL); |
300 | } | |
95b0f9ea MS |
301 | |
302 | if ((u32) memblock.memory.regions[0].size < kernel_tlb) { | |
6bd55f0b | 303 | pr_emerg("Kernel size is greater than memory node\n"); |
95b0f9ea MS |
304 | machine_restart(NULL); |
305 | } | |
306 | ||
4dc60832 | 307 | /* Find main memory where the kernel is */ |
da5ab11c | 308 | memory_start = (u32) memblock.memory.regions[0].base; |
83a92529 MS |
309 | lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; |
310 | ||
311 | if (lowmem_size > CONFIG_LOWMEM_SIZE) { | |
312 | lowmem_size = CONFIG_LOWMEM_SIZE; | |
2f2f371f | 313 | #ifndef CONFIG_HIGHMEM |
83a92529 | 314 | memory_size = lowmem_size; |
2f2f371f | 315 | #endif |
83a92529 | 316 | } |
4dc60832 MS |
317 | |
318 | mm_cmdline_setup(); /* FIXME parse args from command line - not used */ | |
319 | ||
320 | /* | |
321 | * Map out the kernel text/data/bss from the available physical | |
322 | * memory. | |
323 | */ | |
324 | kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ | |
325 | /* kernel size */ | |
326 | ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); | |
95f72d1e | 327 | memblock_reserve(kstart, ksize); |
4dc60832 MS |
328 | |
329 | #if defined(CONFIG_BLK_DEV_INITRD) | |
330 | /* Remove the init RAM disk from the available memory. */ | |
5eec2f02 MS |
331 | if (initrd_start) { |
332 | unsigned long size; | |
333 | size = initrd_end - initrd_start; | |
a66a6265 | 334 | memblock_reserve(__virt_to_phys(initrd_start), size); |
5eec2f02 | 335 | } |
4dc60832 MS |
336 | #endif /* CONFIG_BLK_DEV_INITRD */ |
337 | ||
338 | /* Initialize the MMU hardware */ | |
339 | mmu_init_hw(); | |
340 | ||
341 | /* Map in all of RAM starting at CONFIG_KERNEL_START */ | |
342 | mapin_ram(); | |
343 | ||
41938761 | 344 | /* Extend vmalloc and ioremap area as big as possible */ |
2f2f371f MS |
345 | #ifdef CONFIG_HIGHMEM |
346 | ioremap_base = ioremap_bot = PKMAP_BASE; | |
347 | #else | |
41938761 | 348 | ioremap_base = ioremap_bot = FIXADDR_START; |
2f2f371f | 349 | #endif |
41938761 | 350 | |
4dc60832 MS |
351 | /* Initialize the context management stuff */ |
352 | mmu_context_init(); | |
83a92529 MS |
353 | |
354 | /* Shortly after that, the entire linear mapping will be available */ | |
355 | /* This will also cause that unflatten device tree will be allocated | |
356 | * inside 768MB limit */ | |
357 | memblock_set_current_limit(memory_start + lowmem_size - 1); | |
4dc60832 MS |
358 | } |
359 | ||
360 | /* This is only called until mem_init is done. */ | |
361 | void __init *early_get_page(void) | |
362 | { | |
101646a2 RH |
363 | /* |
364 | * Mem start + kernel_tlb -> here is limit | |
365 | * because of mem mapping from head.S | |
366 | */ | |
367 | return __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, | |
368 | memory_start + kernel_tlb)); | |
4dc60832 | 369 | } |
a84642a3 | 370 | |
79bf3a13 MS |
371 | #endif /* CONFIG_MMU */ |
372 | ||
bd721ea7 | 373 | void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) |
a84642a3 MS |
374 | { |
375 | void *p; | |
376 | ||
377 | if (mem_init_done) | |
378 | p = kzalloc(size, mask); | |
379 | else { | |
380 | p = alloc_bootmem(size); | |
381 | if (p) | |
382 | memset(p, 0, size); | |
383 | } | |
384 | return p; | |
385 | } |