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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> |
13 | #include <linux/memblock.h> |
14 | #include <linux/mm.h> /* mem_init */ |
15 | #include <linux/initrd.h> |
16 | #include <linux/pagemap.h> |
17 | #include <linux/pfn.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/swap.h> |
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> |
26 | |
27 | /* Use for MMU and noMMU because of PCI generic code */ |
28 | int mem_init_done; |
29 | |
30 | #ifndef CONFIG_MMU |
31 | unsigned int __page_offset; |
32 | EXPORT_SYMBOL(__page_offset); |
33 | |
34 | #else |
35 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); |
36 | |
37 | static int init_bootmem_done; |
38 | #endif /* CONFIG_MMU */ |
39 | |
40 | char *klimit = _end; |
41 | |
42 | /* |
43 | * Initialize the bootmem system and give it all the memory we |
44 | * have available. |
45 | */ |
46 | unsigned long memory_start; |
47 | EXPORT_SYMBOL(memory_start); |
48 | unsigned long memory_end; /* due to mm/nommu.c */ |
49 | unsigned long memory_size; |
50 | EXPORT_SYMBOL(memory_size); |
51 | |
52 | /* |
53 | * paging_init() sets up the page tables - in fact we've already done this. |
54 | */ |
55 | static void __init paging_init(void) |
56 | { |
57 | unsigned long zones_size[MAX_NR_ZONES]; |
58 | |
59 | /* Clean every zones */ |
60 | memset(zones_size, 0, sizeof(zones_size)); |
61 | |
62 | /* |
63 | * old: we can DMA to/from any address.put all page into ZONE_DMA |
64 | * We use only ZONE_NORMAL |
65 | */ |
66 | zones_size[ZONE_NORMAL] = max_mapnr; |
67 | |
68 | free_area_init(zones_size); |
69 | } |
70 | |
71 | void __init setup_memory(void) |
72 | { |
73 | unsigned long map_size; |
74 | struct memblock_region *reg; |
75 | |
76 | #ifndef CONFIG_MMU |
77 | u32 kernel_align_start, kernel_align_size; |
78 | |
79 | /* Find main memory where is the kernel */ |
80 | for_each_memblock(memory, reg) { |
81 | memory_start = (u32)reg->base; |
82 | memory_end = (u32) reg->base + reg->size; |
83 | if ((memory_start <= (u32)_text) && |
84 | ((u32)_text <= memory_end)) { |
85 | memory_size = memory_end - memory_start; |
86 | PAGE_OFFSET = memory_start; |
87 | printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, " |
88 | "size 0x%08x\n", __func__, (u32) memory_start, |
89 | (u32) memory_end, (u32) memory_size); |
90 | break; |
91 | } |
92 | } |
93 | |
94 | if (!memory_start || !memory_end) { |
95 | panic("%s: Missing memory setting 0x%08x-0x%08x\n", |
96 | __func__, (u32) memory_start, (u32) memory_end); |
97 | } |
98 | |
99 | /* reservation of region where is the kernel */ |
100 | kernel_align_start = PAGE_DOWN((u32)_text); |
101 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ |
102 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; |
103 | memblock_reserve(kernel_align_start, kernel_align_size); |
104 | printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n", |
105 | __func__, kernel_align_start, kernel_align_start |
106 | + kernel_align_size, kernel_align_size); |
107 | |
108 | #endif |
109 | /* |
110 | * Kernel: |
111 | * start: base phys address of kernel - page align |
112 | * end: base phys address of kernel - page align |
113 | * |
114 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) |
115 | * max_low_pfn |
116 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) |
117 | * num_physpages - number of all pages |
118 | */ |
119 | |
120 | /* memory start is from the kernel end (aligned) to higher addr */ |
121 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ |
122 | /* RAM is assumed contiguous */ |
123 | num_physpages = max_mapnr = memory_size >> PAGE_SHIFT; |
124 | max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT; |
125 | |
126 | printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr); |
127 | printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); |
128 | printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); |
129 | |
130 | /* |
131 | * Find an area to use for the bootmem bitmap. |
132 | * We look for the first area which is at least |
133 | * 128kB in length (128kB is enough for a bitmap |
134 | * for 4GB of memory, using 4kB pages), plus 1 page |
135 | * (in case the address isn't page-aligned). |
136 | */ |
137 | map_size = init_bootmem_node(NODE_DATA(0), |
138 | PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); |
139 | memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size); |
140 | |
141 | /* free bootmem is whole main memory */ |
142 | free_bootmem(memory_start, memory_size); |
143 | |
144 | /* reserve allocate blocks */ |
145 | for_each_memblock(reserved, reg) { |
146 | pr_debug("reserved - 0x%08x-0x%08x\n", |
147 | (u32) reg->base, (u32) reg->size); |
148 | reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); |
149 | } |
150 | #ifdef CONFIG_MMU |
151 | init_bootmem_done = 1; |
152 | #endif |
153 | paging_init(); |
154 | } |
155 | |
156 | void free_init_pages(char *what, unsigned long begin, unsigned long end) |
157 | { |
158 | unsigned long addr; |
159 | |
160 | for (addr = begin; addr < end; addr += PAGE_SIZE) { |
161 | ClearPageReserved(virt_to_page(addr)); |
162 | init_page_count(virt_to_page(addr)); |
163 | free_page(addr); |
164 | totalram_pages++; |
165 | } |
166 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
167 | } |
168 | |
169 | #ifdef CONFIG_BLK_DEV_INITRD |
170 | void free_initrd_mem(unsigned long start, unsigned long end) |
171 | { |
172 | int pages = 0; |
173 | for (; start < end; start += PAGE_SIZE) { |
174 | ClearPageReserved(virt_to_page(start)); |
175 | init_page_count(virt_to_page(start)); |
176 | free_page(start); |
177 | totalram_pages++; |
178 | pages++; |
179 | } |
180 | printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", |
181 | (int)(pages * (PAGE_SIZE / 1024))); |
182 | } |
183 | #endif |
184 | |
185 | void free_initmem(void) |
186 | { |
187 | free_init_pages("unused kernel memory", |
188 | (unsigned long)(&__init_begin), |
189 | (unsigned long)(&__init_end)); |
190 | } |
191 | |
192 | void __init mem_init(void) |
193 | { |
194 | high_memory = (void *)__va(memory_end); |
195 | /* this will put all memory onto the freelists */ |
196 | totalram_pages += free_all_bootmem(); |
197 | |
198 | printk(KERN_INFO "Memory: %luk/%luk available\n", |
199 | nr_free_pages() << (PAGE_SHIFT-10), |
200 | num_physpages << (PAGE_SHIFT-10)); |
201 | mem_init_done = 1; |
202 | } |
203 | |
204 | #ifndef CONFIG_MMU |
205 | int page_is_ram(unsigned long pfn) |
206 | { |
207 | return __range_ok(pfn, 0); |
208 | } |
209 | #else |
210 | int page_is_ram(unsigned long pfn) |
211 | { |
212 | return pfn < max_low_pfn; |
213 | } |
214 | |
215 | /* |
216 | * Check for command-line options that affect what MMU_init will do. |
217 | */ |
218 | static void mm_cmdline_setup(void) |
219 | { |
220 | unsigned long maxmem = 0; |
221 | char *p = cmd_line; |
222 | |
223 | /* Look for mem= option on command line */ |
224 | p = strstr(cmd_line, "mem="); |
225 | if (p) { |
226 | p += 4; |
227 | maxmem = memparse(p, &p); |
228 | if (maxmem && memory_size > maxmem) { |
229 | memory_size = maxmem; |
230 | memory_end = memory_start + memory_size; |
231 | memblock.memory.regions[0].size = memory_size; |
232 | } |
233 | } |
234 | } |
235 | |
236 | /* |
237 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. |
238 | */ |
239 | static void __init mmu_init_hw(void) |
240 | { |
241 | /* |
242 | * The Zone Protection Register (ZPR) defines how protection will |
243 | * be applied to every page which is a member of a given zone. At |
244 | * present, we utilize only two of the zones. |
245 | * The zone index bits (of ZSEL) in the PTE are used for software |
246 | * indicators, except the LSB. For user access, zone 1 is used, |
247 | * for kernel access, zone 0 is used. We set all but zone 1 |
248 | * to zero, allowing only kernel access as indicated in the PTE. |
249 | * For zone 1, we set a 01 binary (a value of 10 will not work) |
250 | * to allow user access as indicated in the PTE. This also allows |
251 | * kernel access as indicated in the PTE. |
252 | */ |
253 | __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ |
254 | "mts rzpr, r11;" |
255 | : : : "r11"); |
256 | } |
257 | |
258 | /* |
259 | * MMU_init sets up the basic memory mappings for the kernel, |
260 | * including both RAM and possibly some I/O regions, |
261 | * and sets up the page tables and the MMU hardware ready to go. |
262 | */ |
263 | |
264 | /* called from head.S */ |
265 | asmlinkage void __init mmu_init(void) |
266 | { |
267 | unsigned int kstart, ksize; |
268 | |
269 | if (!memblock.reserved.cnt) { |
270 | printk(KERN_EMERG "Error memory count\n"); |
271 | machine_restart(NULL); |
272 | } |
273 | |
274 | if ((u32) memblock.memory.regions[0].size < 0x1000000) { |
275 | printk(KERN_EMERG "Memory must be greater than 16MB\n"); |
276 | machine_restart(NULL); |
277 | } |
278 | /* Find main memory where the kernel is */ |
279 | memory_start = (u32) memblock.memory.regions[0].base; |
280 | memory_end = (u32) memblock.memory.regions[0].base + |
281 | (u32) memblock.memory.regions[0].size; |
282 | memory_size = memory_end - memory_start; |
283 | |
284 | mm_cmdline_setup(); /* FIXME parse args from command line - not used */ |
285 | |
286 | /* |
287 | * Map out the kernel text/data/bss from the available physical |
288 | * memory. |
289 | */ |
290 | kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ |
291 | /* kernel size */ |
292 | ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); |
293 | memblock_reserve(kstart, ksize); |
294 | |
295 | #if defined(CONFIG_BLK_DEV_INITRD) |
296 | /* Remove the init RAM disk from the available memory. */ |
297 | /* if (initrd_start) { |
298 | mem_pieces_remove(&phys_avail, __pa(initrd_start), |
299 | initrd_end - initrd_start, 1); |
300 | }*/ |
301 | #endif /* CONFIG_BLK_DEV_INITRD */ |
302 | |
303 | /* Initialize the MMU hardware */ |
304 | mmu_init_hw(); |
305 | |
306 | /* Map in all of RAM starting at CONFIG_KERNEL_START */ |
307 | mapin_ram(); |
308 | |
309 | #ifdef HIGHMEM_START_BOOL |
310 | ioremap_base = HIGHMEM_START; |
311 | #else |
312 | ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ |
313 | #endif /* CONFIG_HIGHMEM */ |
314 | ioremap_bot = ioremap_base; |
315 | |
316 | /* Initialize the context management stuff */ |
317 | mmu_context_init(); |
318 | } |
319 | |
320 | /* This is only called until mem_init is done. */ |
321 | void __init *early_get_page(void) |
322 | { |
323 | void *p; |
324 | if (init_bootmem_done) { |
325 | p = alloc_bootmem_pages(PAGE_SIZE); |
326 | } else { |
327 | /* |
328 | * Mem start + 32MB -> here is limit |
329 | * because of mem mapping from head.S |
330 | */ |
331 | p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, |
332 | memory_start + 0x2000000)); |
333 | } |
334 | return p; |
335 | } |
336 | |
337 | #endif /* CONFIG_MMU */ |
338 | |
339 | void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask) |
340 | { |
341 | if (mem_init_done) |
342 | return kmalloc(size, mask); |
343 | else |
344 | return alloc_bootmem(size); |
345 | } |
346 | |
347 | void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask) |
348 | { |
349 | void *p; |
350 | |
351 | if (mem_init_done) |
352 | p = kzalloc(size, mask); |
353 | else { |
354 | p = alloc_bootmem(size); |
355 | if (p) |
356 | memset(p, 0, size); |
357 | } |
358 | return p; |
359 | } |
360 |
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