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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 MS |
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 | ||
79bf3a13 MS |
27 | /* Use for MMU and noMMU because of PCI generic code */ |
28 | int mem_init_done; | |
29 | ||
4dc60832 | 30 | #ifndef CONFIG_MMU |
a95d0e16 | 31 | unsigned int __page_offset; |
5af7fa68 | 32 | EXPORT_SYMBOL(__page_offset); |
a95d0e16 | 33 | |
4dc60832 MS |
34 | #else |
35 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
36 | ||
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 MS |
48 | unsigned long memory_end; /* due to mm/nommu.c */ |
49 | unsigned long memory_size; | |
ee4bcdf1 | 50 | EXPORT_SYMBOL(memory_size); |
a95d0e16 MS |
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 | { | |
a95d0e16 MS |
57 | unsigned long zones_size[MAX_NR_ZONES]; |
58 | ||
5af90438 SM |
59 | /* Clean every zones */ |
60 | memset(zones_size, 0, sizeof(zones_size)); | |
61 | ||
a95d0e16 MS |
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 | ||
a95d0e16 MS |
68 | free_area_init(zones_size); |
69 | } | |
70 | ||
71 | void __init setup_memory(void) | |
72 | { | |
a95d0e16 | 73 | unsigned long map_size; |
76bfcc81 BH |
74 | struct memblock_region *reg; |
75 | ||
4dc60832 | 76 | #ifndef CONFIG_MMU |
a95d0e16 MS |
77 | u32 kernel_align_start, kernel_align_size; |
78 | ||
79 | /* Find main memory where is the kernel */ | |
76bfcc81 BH |
80 | for_each_memblock(memory, reg) { |
81 | memory_start = (u32)reg->base; | |
82 | memory_end = (u32) reg->base + reg->size; | |
a95d0e16 MS |
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, " | |
db6e3f91 MS |
88 | "size 0x%08x\n", __func__, (u32) memory_start, |
89 | (u32) memory_end, (u32) memory_size); | |
a95d0e16 MS |
90 | break; |
91 | } | |
92 | } | |
93 | ||
94 | if (!memory_start || !memory_end) { | |
95 | panic("%s: Missing memory setting 0x%08x-0x%08x\n", | |
db6e3f91 | 96 | __func__, (u32) memory_start, (u32) memory_end); |
a95d0e16 MS |
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; | |
95f72d1e | 103 | memblock_reserve(kernel_align_start, kernel_align_size); |
a95d0e16 MS |
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 | ||
4dc60832 | 108 | #endif |
a95d0e16 MS |
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 | */ | |
e0581667 | 137 | map_size = init_bootmem_node(NODE_DATA(0), |
8f37b6c9 | 138 | PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); |
95f72d1e | 139 | memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size); |
a95d0e16 MS |
140 | |
141 | /* free bootmem is whole main memory */ | |
142 | free_bootmem(memory_start, memory_size); | |
143 | ||
144 | /* reserve allocate blocks */ | |
76bfcc81 BH |
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); | |
a95d0e16 | 149 | } |
4dc60832 MS |
150 | #ifdef CONFIG_MMU |
151 | init_bootmem_done = 1; | |
152 | #endif | |
a95d0e16 MS |
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)); | |
a95d0e16 MS |
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 | } | |
d6f61770 LS |
180 | printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", |
181 | (int)(pages * (PAGE_SIZE / 1024))); | |
a95d0e16 MS |
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 | ||
a95d0e16 MS |
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", | |
cc013a88 | 199 | nr_free_pages() << (PAGE_SHIFT-10), |
a95d0e16 | 200 | num_physpages << (PAGE_SHIFT-10)); |
4dc60832 | 201 | mem_init_done = 1; |
a95d0e16 MS |
202 | } |
203 | ||
4dc60832 | 204 | #ifndef CONFIG_MMU |
79bf3a13 MS |
205 | int page_is_ram(unsigned long pfn) |
206 | { | |
207 | return __range_ok(pfn, 0); | |
208 | } | |
4dc60832 MS |
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; | |
da5ab11c | 231 | memblock.memory.regions[0].size = memory_size; |
4dc60832 MS |
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 | ||
95f72d1e | 269 | if (!memblock.reserved.cnt) { |
4dc60832 MS |
270 | printk(KERN_EMERG "Error memory count\n"); |
271 | machine_restart(NULL); | |
272 | } | |
273 | ||
da5ab11c | 274 | if ((u32) memblock.memory.regions[0].size < 0x1000000) { |
4dc60832 MS |
275 | printk(KERN_EMERG "Memory must be greater than 16MB\n"); |
276 | machine_restart(NULL); | |
277 | } | |
278 | /* Find main memory where the kernel is */ | |
da5ab11c MS |
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; | |
4dc60832 MS |
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)); | |
95f72d1e | 293 | memblock_reserve(kstart, ksize); |
4dc60832 MS |
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 | */ | |
95f72d1e | 331 | p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, |
4dc60832 MS |
332 | memory_start + 0x2000000)); |
333 | } | |
334 | return p; | |
335 | } | |
a84642a3 | 336 | |
79bf3a13 MS |
337 | #endif /* CONFIG_MMU */ |
338 | ||
a84642a3 MS |
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 | } |