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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); |
a95d0e16 | 35 | |
4dc60832 | 36 | #else |
4dc60832 MS |
37 | static int init_bootmem_done; |
38 | #endif /* CONFIG_MMU */ | |
39 | ||
a95d0e16 MS |
40 | char *klimit = _end; |
41 | ||
42 | /* | |
43 | * Initialize the bootmem system and give it all the memory we | |
44 | * have available. | |
45 | */ | |
4dc60832 | 46 | unsigned long memory_start; |
fd6ed51f | 47 | EXPORT_SYMBOL(memory_start); |
4dc60832 | 48 | unsigned long memory_size; |
ee4bcdf1 | 49 | EXPORT_SYMBOL(memory_size); |
83a92529 | 50 | unsigned long lowmem_size; |
a95d0e16 | 51 | |
2f2f371f MS |
52 | #ifdef CONFIG_HIGHMEM |
53 | pte_t *kmap_pte; | |
54 | EXPORT_SYMBOL(kmap_pte); | |
55 | pgprot_t kmap_prot; | |
56 | EXPORT_SYMBOL(kmap_prot); | |
57 | ||
58 | static inline pte_t *virt_to_kpte(unsigned long vaddr) | |
59 | { | |
60 | return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), | |
61 | vaddr), vaddr); | |
62 | } | |
63 | ||
64 | static void __init highmem_init(void) | |
65 | { | |
66 | pr_debug("%x\n", (u32)PKMAP_BASE); | |
67 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
68 | pkmap_page_table = virt_to_kpte(PKMAP_BASE); | |
69 | ||
70 | kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN)); | |
71 | kmap_prot = PAGE_KERNEL; | |
72 | } | |
73 | ||
6879ea83 | 74 | static void highmem_setup(void) |
2f2f371f MS |
75 | { |
76 | unsigned long pfn; | |
2f2f371f MS |
77 | |
78 | for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) { | |
79 | struct page *page = pfn_to_page(pfn); | |
80 | ||
81 | /* FIXME not sure about */ | |
6879ea83 JL |
82 | if (!memblock_is_reserved(pfn << PAGE_SHIFT)) |
83 | free_highmem_page(page); | |
2f2f371f | 84 | } |
2f2f371f MS |
85 | } |
86 | #endif /* CONFIG_HIGHMEM */ | |
87 | ||
a95d0e16 MS |
88 | /* |
89 | * paging_init() sets up the page tables - in fact we've already done this. | |
90 | */ | |
91 | static void __init paging_init(void) | |
92 | { | |
a95d0e16 | 93 | unsigned long zones_size[MAX_NR_ZONES]; |
41938761 MS |
94 | #ifdef CONFIG_MMU |
95 | int idx; | |
96 | ||
97 | /* Setup fixmaps */ | |
98 | for (idx = 0; idx < __end_of_fixed_addresses; idx++) | |
99 | clear_fixmap(idx); | |
100 | #endif | |
a95d0e16 | 101 | |
5af90438 SM |
102 | /* Clean every zones */ |
103 | memset(zones_size, 0, sizeof(zones_size)); | |
104 | ||
2f2f371f MS |
105 | #ifdef CONFIG_HIGHMEM |
106 | highmem_init(); | |
107 | ||
108 | zones_size[ZONE_DMA] = max_low_pfn; | |
109 | zones_size[ZONE_HIGHMEM] = max_pfn; | |
110 | #else | |
83a92529 | 111 | zones_size[ZONE_DMA] = max_pfn; |
2f2f371f | 112 | #endif |
a95d0e16 | 113 | |
baab8a82 MS |
114 | /* We don't have holes in memory map */ |
115 | free_area_init_nodes(zones_size); | |
a95d0e16 MS |
116 | } |
117 | ||
118 | void __init setup_memory(void) | |
119 | { | |
a95d0e16 | 120 | unsigned long map_size; |
76bfcc81 BH |
121 | struct memblock_region *reg; |
122 | ||
4dc60832 | 123 | #ifndef CONFIG_MMU |
a95d0e16 MS |
124 | u32 kernel_align_start, kernel_align_size; |
125 | ||
126 | /* Find main memory where is the kernel */ | |
76bfcc81 BH |
127 | for_each_memblock(memory, reg) { |
128 | memory_start = (u32)reg->base; | |
83a92529 | 129 | lowmem_size = reg->size; |
a95d0e16 | 130 | if ((memory_start <= (u32)_text) && |
83a92529 MS |
131 | ((u32)_text <= (memory_start + lowmem_size - 1))) { |
132 | memory_size = lowmem_size; | |
a95d0e16 | 133 | PAGE_OFFSET = memory_start; |
6bd55f0b MS |
134 | pr_info("%s: Main mem: 0x%x, size 0x%08x\n", |
135 | __func__, (u32) memory_start, | |
83a92529 | 136 | (u32) memory_size); |
a95d0e16 MS |
137 | break; |
138 | } | |
139 | } | |
140 | ||
83a92529 MS |
141 | if (!memory_start || !memory_size) { |
142 | panic("%s: Missing memory setting 0x%08x, size=0x%08x\n", | |
143 | __func__, (u32) memory_start, (u32) memory_size); | |
a95d0e16 MS |
144 | } |
145 | ||
146 | /* reservation of region where is the kernel */ | |
147 | kernel_align_start = PAGE_DOWN((u32)_text); | |
148 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ | |
149 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; | |
6bd55f0b | 150 | pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n", |
a95d0e16 MS |
151 | __func__, kernel_align_start, kernel_align_start |
152 | + kernel_align_size, kernel_align_size); | |
83a92529 | 153 | memblock_reserve(kernel_align_start, kernel_align_size); |
4dc60832 | 154 | #endif |
a95d0e16 MS |
155 | /* |
156 | * Kernel: | |
157 | * start: base phys address of kernel - page align | |
158 | * end: base phys address of kernel - page align | |
159 | * | |
160 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) | |
161 | * max_low_pfn | |
162 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) | |
a95d0e16 MS |
163 | */ |
164 | ||
165 | /* memory start is from the kernel end (aligned) to higher addr */ | |
166 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ | |
167 | /* RAM is assumed contiguous */ | |
6879ea83 | 168 | max_mapnr = memory_size >> PAGE_SHIFT; |
83a92529 MS |
169 | max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT; |
170 | max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT; | |
a95d0e16 | 171 | |
6bd55f0b MS |
172 | pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
173 | pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); | |
174 | pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); | |
175 | pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn); | |
a95d0e16 MS |
176 | |
177 | /* | |
178 | * Find an area to use for the bootmem bitmap. | |
179 | * We look for the first area which is at least | |
180 | * 128kB in length (128kB is enough for a bitmap | |
181 | * for 4GB of memory, using 4kB pages), plus 1 page | |
182 | * (in case the address isn't page-aligned). | |
183 | */ | |
e0581667 | 184 | map_size = init_bootmem_node(NODE_DATA(0), |
8f37b6c9 | 185 | PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); |
95f72d1e | 186 | memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size); |
a95d0e16 | 187 | |
baab8a82 MS |
188 | /* Add active regions with valid PFNs */ |
189 | for_each_memblock(memory, reg) { | |
190 | unsigned long start_pfn, end_pfn; | |
191 | ||
192 | start_pfn = memblock_region_memory_base_pfn(reg); | |
193 | end_pfn = memblock_region_memory_end_pfn(reg); | |
194 | memblock_set_node(start_pfn << PAGE_SHIFT, | |
e7e8de59 TC |
195 | (end_pfn - start_pfn) << PAGE_SHIFT, |
196 | &memblock.memory, 0); | |
baab8a82 MS |
197 | } |
198 | ||
a95d0e16 | 199 | /* free bootmem is whole main memory */ |
baab8a82 | 200 | free_bootmem_with_active_regions(0, max_low_pfn); |
a95d0e16 MS |
201 | |
202 | /* reserve allocate blocks */ | |
76bfcc81 | 203 | for_each_memblock(reserved, reg) { |
83a92529 MS |
204 | unsigned long top = reg->base + reg->size - 1; |
205 | ||
206 | pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n", | |
207 | (u32) reg->base, (u32) reg->size, top, | |
208 | memory_start + lowmem_size - 1); | |
209 | ||
210 | if (top <= (memory_start + lowmem_size - 1)) { | |
211 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); | |
212 | } else if (reg->base < (memory_start + lowmem_size - 1)) { | |
213 | unsigned long trunc_size = memory_start + lowmem_size - | |
214 | reg->base; | |
215 | reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT); | |
216 | } | |
a95d0e16 | 217 | } |
83a92529 | 218 | |
baab8a82 MS |
219 | /* XXX need to clip this if using highmem? */ |
220 | sparse_memory_present_with_active_regions(0); | |
221 | ||
4dc60832 MS |
222 | #ifdef CONFIG_MMU |
223 | init_bootmem_done = 1; | |
224 | #endif | |
a95d0e16 MS |
225 | paging_init(); |
226 | } | |
227 | ||
a95d0e16 MS |
228 | #ifdef CONFIG_BLK_DEV_INITRD |
229 | void free_initrd_mem(unsigned long start, unsigned long end) | |
230 | { | |
dbe67df4 | 231 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
a95d0e16 MS |
232 | } |
233 | #endif | |
234 | ||
235 | void free_initmem(void) | |
236 | { | |
dbe67df4 | 237 | free_initmem_default(-1); |
a95d0e16 MS |
238 | } |
239 | ||
a95d0e16 MS |
240 | void __init mem_init(void) |
241 | { | |
83a92529 MS |
242 | high_memory = (void *)__va(memory_start + lowmem_size - 1); |
243 | ||
a95d0e16 | 244 | /* this will put all memory onto the freelists */ |
0c988534 | 245 | free_all_bootmem(); |
2f2f371f | 246 | #ifdef CONFIG_HIGHMEM |
6879ea83 | 247 | highmem_setup(); |
2f2f371f MS |
248 | #endif |
249 | ||
6879ea83 | 250 | mem_init_print_info(NULL); |
83299799 MS |
251 | #ifdef CONFIG_MMU |
252 | pr_info("Kernel virtual memory layout:\n"); | |
253 | pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP); | |
2f2f371f MS |
254 | #ifdef CONFIG_HIGHMEM |
255 | pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n", | |
256 | PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP)); | |
257 | #endif /* CONFIG_HIGHMEM */ | |
83299799 MS |
258 | pr_info(" * 0x%08lx..0x%08lx : early ioremap\n", |
259 | ioremap_bot, ioremap_base); | |
260 | pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n", | |
261 | (unsigned long)VMALLOC_START, VMALLOC_END); | |
262 | #endif | |
4dc60832 | 263 | mem_init_done = 1; |
a95d0e16 MS |
264 | } |
265 | ||
4dc60832 | 266 | #ifndef CONFIG_MMU |
79bf3a13 MS |
267 | int page_is_ram(unsigned long pfn) |
268 | { | |
269 | return __range_ok(pfn, 0); | |
270 | } | |
4dc60832 MS |
271 | #else |
272 | int page_is_ram(unsigned long pfn) | |
273 | { | |
274 | return pfn < max_low_pfn; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Check for command-line options that affect what MMU_init will do. | |
279 | */ | |
280 | static void mm_cmdline_setup(void) | |
281 | { | |
282 | unsigned long maxmem = 0; | |
283 | char *p = cmd_line; | |
284 | ||
285 | /* Look for mem= option on command line */ | |
286 | p = strstr(cmd_line, "mem="); | |
287 | if (p) { | |
288 | p += 4; | |
289 | maxmem = memparse(p, &p); | |
290 | if (maxmem && memory_size > maxmem) { | |
291 | memory_size = maxmem; | |
da5ab11c | 292 | memblock.memory.regions[0].size = memory_size; |
4dc60832 MS |
293 | } |
294 | } | |
295 | } | |
296 | ||
297 | /* | |
298 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. | |
299 | */ | |
300 | static void __init mmu_init_hw(void) | |
301 | { | |
302 | /* | |
303 | * The Zone Protection Register (ZPR) defines how protection will | |
304 | * be applied to every page which is a member of a given zone. At | |
305 | * present, we utilize only two of the zones. | |
306 | * The zone index bits (of ZSEL) in the PTE are used for software | |
307 | * indicators, except the LSB. For user access, zone 1 is used, | |
308 | * for kernel access, zone 0 is used. We set all but zone 1 | |
309 | * to zero, allowing only kernel access as indicated in the PTE. | |
310 | * For zone 1, we set a 01 binary (a value of 10 will not work) | |
311 | * to allow user access as indicated in the PTE. This also allows | |
312 | * kernel access as indicated in the PTE. | |
313 | */ | |
314 | __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ | |
315 | "mts rzpr, r11;" | |
316 | : : : "r11"); | |
317 | } | |
318 | ||
319 | /* | |
320 | * MMU_init sets up the basic memory mappings for the kernel, | |
321 | * including both RAM and possibly some I/O regions, | |
322 | * and sets up the page tables and the MMU hardware ready to go. | |
323 | */ | |
324 | ||
325 | /* called from head.S */ | |
326 | asmlinkage void __init mmu_init(void) | |
327 | { | |
328 | unsigned int kstart, ksize; | |
329 | ||
95f72d1e | 330 | if (!memblock.reserved.cnt) { |
6bd55f0b | 331 | pr_emerg("Error memory count\n"); |
4dc60832 MS |
332 | machine_restart(NULL); |
333 | } | |
334 | ||
95b0f9ea | 335 | if ((u32) memblock.memory.regions[0].size < 0x400000) { |
6bd55f0b | 336 | pr_emerg("Memory must be greater than 4MB\n"); |
4dc60832 MS |
337 | machine_restart(NULL); |
338 | } | |
95b0f9ea MS |
339 | |
340 | if ((u32) memblock.memory.regions[0].size < kernel_tlb) { | |
6bd55f0b | 341 | pr_emerg("Kernel size is greater than memory node\n"); |
95b0f9ea MS |
342 | machine_restart(NULL); |
343 | } | |
344 | ||
4dc60832 | 345 | /* Find main memory where the kernel is */ |
da5ab11c | 346 | memory_start = (u32) memblock.memory.regions[0].base; |
83a92529 MS |
347 | lowmem_size = memory_size = (u32) memblock.memory.regions[0].size; |
348 | ||
349 | if (lowmem_size > CONFIG_LOWMEM_SIZE) { | |
350 | lowmem_size = CONFIG_LOWMEM_SIZE; | |
2f2f371f | 351 | #ifndef CONFIG_HIGHMEM |
83a92529 | 352 | memory_size = lowmem_size; |
2f2f371f | 353 | #endif |
83a92529 | 354 | } |
4dc60832 MS |
355 | |
356 | mm_cmdline_setup(); /* FIXME parse args from command line - not used */ | |
357 | ||
358 | /* | |
359 | * Map out the kernel text/data/bss from the available physical | |
360 | * memory. | |
361 | */ | |
362 | kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ | |
363 | /* kernel size */ | |
364 | ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); | |
95f72d1e | 365 | memblock_reserve(kstart, ksize); |
4dc60832 MS |
366 | |
367 | #if defined(CONFIG_BLK_DEV_INITRD) | |
368 | /* Remove the init RAM disk from the available memory. */ | |
5eec2f02 MS |
369 | if (initrd_start) { |
370 | unsigned long size; | |
371 | size = initrd_end - initrd_start; | |
a66a6265 | 372 | memblock_reserve(__virt_to_phys(initrd_start), size); |
5eec2f02 | 373 | } |
4dc60832 MS |
374 | #endif /* CONFIG_BLK_DEV_INITRD */ |
375 | ||
376 | /* Initialize the MMU hardware */ | |
377 | mmu_init_hw(); | |
378 | ||
379 | /* Map in all of RAM starting at CONFIG_KERNEL_START */ | |
380 | mapin_ram(); | |
381 | ||
41938761 | 382 | /* Extend vmalloc and ioremap area as big as possible */ |
2f2f371f MS |
383 | #ifdef CONFIG_HIGHMEM |
384 | ioremap_base = ioremap_bot = PKMAP_BASE; | |
385 | #else | |
41938761 | 386 | ioremap_base = ioremap_bot = FIXADDR_START; |
2f2f371f | 387 | #endif |
41938761 | 388 | |
4dc60832 MS |
389 | /* Initialize the context management stuff */ |
390 | mmu_context_init(); | |
83a92529 MS |
391 | |
392 | /* Shortly after that, the entire linear mapping will be available */ | |
393 | /* This will also cause that unflatten device tree will be allocated | |
394 | * inside 768MB limit */ | |
395 | memblock_set_current_limit(memory_start + lowmem_size - 1); | |
4dc60832 MS |
396 | } |
397 | ||
398 | /* This is only called until mem_init is done. */ | |
399 | void __init *early_get_page(void) | |
400 | { | |
401 | void *p; | |
402 | if (init_bootmem_done) { | |
403 | p = alloc_bootmem_pages(PAGE_SIZE); | |
404 | } else { | |
405 | /* | |
95b0f9ea | 406 | * Mem start + kernel_tlb -> here is limit |
4dc60832 MS |
407 | * because of mem mapping from head.S |
408 | */ | |
95f72d1e | 409 | p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, |
95b0f9ea | 410 | memory_start + kernel_tlb)); |
4dc60832 MS |
411 | } |
412 | return p; | |
413 | } | |
a84642a3 | 414 | |
79bf3a13 MS |
415 | #endif /* CONFIG_MMU */ |
416 | ||
bd721ea7 | 417 | void * __ref alloc_maybe_bootmem(size_t size, gfp_t mask) |
a84642a3 MS |
418 | { |
419 | if (mem_init_done) | |
420 | return kmalloc(size, mask); | |
421 | else | |
422 | return alloc_bootmem(size); | |
423 | } | |
424 | ||
bd721ea7 | 425 | void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask) |
a84642a3 MS |
426 | { |
427 | void *p; | |
428 | ||
429 | if (mem_init_done) | |
430 | p = kzalloc(size, mask); | |
431 | else { | |
432 | p = alloc_bootmem(size); | |
433 | if (p) | |
434 | memset(p, 0, size); | |
435 | } | |
436 | return p; | |
437 | } |