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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> | |
13 | #include <linux/lmb.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/swap.h> | |
19 | ||
20 | #include <asm/page.h> | |
21 | #include <asm/mmu_context.h> | |
22 | #include <asm/pgalloc.h> | |
23 | #include <asm/sections.h> | |
24 | #include <asm/tlb.h> | |
25 | ||
4dc60832 | 26 | #ifndef CONFIG_MMU |
a95d0e16 | 27 | unsigned int __page_offset; |
5af7fa68 | 28 | EXPORT_SYMBOL(__page_offset); |
a95d0e16 | 29 | |
4dc60832 MS |
30 | #else |
31 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
32 | ||
33 | int mem_init_done; | |
34 | static int init_bootmem_done; | |
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 MS |
43 | unsigned long memory_start; |
44 | unsigned long memory_end; /* due to mm/nommu.c */ | |
45 | unsigned long memory_size; | |
a95d0e16 MS |
46 | |
47 | /* | |
48 | * paging_init() sets up the page tables - in fact we've already done this. | |
49 | */ | |
50 | static void __init paging_init(void) | |
51 | { | |
a95d0e16 MS |
52 | unsigned long zones_size[MAX_NR_ZONES]; |
53 | ||
5af90438 SM |
54 | /* Clean every zones */ |
55 | memset(zones_size, 0, sizeof(zones_size)); | |
56 | ||
a95d0e16 MS |
57 | /* |
58 | * old: we can DMA to/from any address.put all page into ZONE_DMA | |
59 | * We use only ZONE_NORMAL | |
60 | */ | |
61 | zones_size[ZONE_NORMAL] = max_mapnr; | |
62 | ||
a95d0e16 MS |
63 | free_area_init(zones_size); |
64 | } | |
65 | ||
66 | void __init setup_memory(void) | |
67 | { | |
68 | int i; | |
69 | unsigned long map_size; | |
4dc60832 | 70 | #ifndef CONFIG_MMU |
a95d0e16 MS |
71 | u32 kernel_align_start, kernel_align_size; |
72 | ||
73 | /* Find main memory where is the kernel */ | |
74 | for (i = 0; i < lmb.memory.cnt; i++) { | |
75 | memory_start = (u32) lmb.memory.region[i].base; | |
76 | memory_end = (u32) lmb.memory.region[i].base | |
77 | + (u32) lmb.memory.region[i].size; | |
78 | if ((memory_start <= (u32)_text) && | |
79 | ((u32)_text <= memory_end)) { | |
80 | memory_size = memory_end - memory_start; | |
81 | PAGE_OFFSET = memory_start; | |
82 | printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, " | |
db6e3f91 MS |
83 | "size 0x%08x\n", __func__, (u32) memory_start, |
84 | (u32) memory_end, (u32) memory_size); | |
a95d0e16 MS |
85 | break; |
86 | } | |
87 | } | |
88 | ||
89 | if (!memory_start || !memory_end) { | |
90 | panic("%s: Missing memory setting 0x%08x-0x%08x\n", | |
db6e3f91 | 91 | __func__, (u32) memory_start, (u32) memory_end); |
a95d0e16 MS |
92 | } |
93 | ||
94 | /* reservation of region where is the kernel */ | |
95 | kernel_align_start = PAGE_DOWN((u32)_text); | |
96 | /* ALIGN can be remove because _end in vmlinux.lds.S is align */ | |
97 | kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; | |
98 | lmb_reserve(kernel_align_start, kernel_align_size); | |
99 | printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n", | |
100 | __func__, kernel_align_start, kernel_align_start | |
101 | + kernel_align_size, kernel_align_size); | |
102 | ||
4dc60832 | 103 | #endif |
a95d0e16 MS |
104 | /* |
105 | * Kernel: | |
106 | * start: base phys address of kernel - page align | |
107 | * end: base phys address of kernel - page align | |
108 | * | |
109 | * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) | |
110 | * max_low_pfn | |
111 | * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) | |
112 | * num_physpages - number of all pages | |
113 | */ | |
114 | ||
115 | /* memory start is from the kernel end (aligned) to higher addr */ | |
116 | min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ | |
117 | /* RAM is assumed contiguous */ | |
118 | num_physpages = max_mapnr = memory_size >> PAGE_SHIFT; | |
119 | max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT; | |
120 | ||
121 | printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr); | |
122 | printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); | |
123 | printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); | |
124 | ||
125 | /* | |
126 | * Find an area to use for the bootmem bitmap. | |
127 | * We look for the first area which is at least | |
128 | * 128kB in length (128kB is enough for a bitmap | |
129 | * for 4GB of memory, using 4kB pages), plus 1 page | |
130 | * (in case the address isn't page-aligned). | |
131 | */ | |
4dc60832 | 132 | #ifndef CONFIG_MMU |
8f37b6c9 | 133 | map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)), |
a95d0e16 | 134 | min_low_pfn, max_low_pfn); |
4dc60832 MS |
135 | #else |
136 | map_size = init_bootmem_node(&contig_page_data, | |
8f37b6c9 | 137 | PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); |
4dc60832 | 138 | #endif |
8f37b6c9 | 139 | lmb_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 */ | |
145 | for (i = 0; i < lmb.reserved.cnt; i++) { | |
146 | pr_debug("reserved %d - 0x%08x-0x%08x\n", i, | |
147 | (u32) lmb.reserved.region[i].base, | |
148 | (u32) lmb_size_bytes(&lmb.reserved, i)); | |
149 | reserve_bootmem(lmb.reserved.region[i].base, | |
150 | lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT); | |
151 | } | |
4dc60832 MS |
152 | #ifdef CONFIG_MMU |
153 | init_bootmem_done = 1; | |
154 | #endif | |
a95d0e16 MS |
155 | paging_init(); |
156 | } | |
157 | ||
158 | void free_init_pages(char *what, unsigned long begin, unsigned long end) | |
159 | { | |
160 | unsigned long addr; | |
161 | ||
162 | for (addr = begin; addr < end; addr += PAGE_SIZE) { | |
163 | ClearPageReserved(virt_to_page(addr)); | |
164 | init_page_count(virt_to_page(addr)); | |
165 | memset((void *)addr, 0xcc, PAGE_SIZE); | |
166 | free_page(addr); | |
167 | totalram_pages++; | |
168 | } | |
169 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
170 | } | |
171 | ||
172 | #ifdef CONFIG_BLK_DEV_INITRD | |
173 | void free_initrd_mem(unsigned long start, unsigned long end) | |
174 | { | |
175 | int pages = 0; | |
176 | for (; start < end; start += PAGE_SIZE) { | |
177 | ClearPageReserved(virt_to_page(start)); | |
178 | init_page_count(virt_to_page(start)); | |
179 | free_page(start); | |
180 | totalram_pages++; | |
181 | pages++; | |
182 | } | |
d6f61770 LS |
183 | printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", |
184 | (int)(pages * (PAGE_SIZE / 1024))); | |
a95d0e16 MS |
185 | } |
186 | #endif | |
187 | ||
188 | void free_initmem(void) | |
189 | { | |
190 | free_init_pages("unused kernel memory", | |
191 | (unsigned long)(&__init_begin), | |
192 | (unsigned long)(&__init_end)); | |
193 | } | |
194 | ||
195 | /* FIXME from arch/powerpc/mm/mem.c*/ | |
196 | void show_mem(void) | |
197 | { | |
198 | printk(KERN_NOTICE "%s\n", __func__); | |
199 | } | |
200 | ||
201 | void __init mem_init(void) | |
202 | { | |
203 | high_memory = (void *)__va(memory_end); | |
204 | /* this will put all memory onto the freelists */ | |
205 | totalram_pages += free_all_bootmem(); | |
206 | ||
207 | printk(KERN_INFO "Memory: %luk/%luk available\n", | |
cc013a88 | 208 | nr_free_pages() << (PAGE_SHIFT-10), |
a95d0e16 | 209 | num_physpages << (PAGE_SHIFT-10)); |
4dc60832 MS |
210 | #ifdef CONFIG_MMU |
211 | mem_init_done = 1; | |
212 | #endif | |
a95d0e16 MS |
213 | } |
214 | ||
4dc60832 | 215 | #ifndef CONFIG_MMU |
a95d0e16 MS |
216 | /* Check against bounds of physical memory */ |
217 | int ___range_ok(unsigned long addr, unsigned long size) | |
218 | { | |
219 | return ((addr < memory_start) || | |
220 | ((addr + size) > memory_end)); | |
221 | } | |
5af7fa68 | 222 | EXPORT_SYMBOL(___range_ok); |
4dc60832 MS |
223 | |
224 | #else | |
225 | int page_is_ram(unsigned long pfn) | |
226 | { | |
227 | return pfn < max_low_pfn; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Check for command-line options that affect what MMU_init will do. | |
232 | */ | |
233 | static void mm_cmdline_setup(void) | |
234 | { | |
235 | unsigned long maxmem = 0; | |
236 | char *p = cmd_line; | |
237 | ||
238 | /* Look for mem= option on command line */ | |
239 | p = strstr(cmd_line, "mem="); | |
240 | if (p) { | |
241 | p += 4; | |
242 | maxmem = memparse(p, &p); | |
243 | if (maxmem && memory_size > maxmem) { | |
244 | memory_size = maxmem; | |
245 | memory_end = memory_start + memory_size; | |
246 | lmb.memory.region[0].size = memory_size; | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
251 | /* | |
252 | * MMU_init_hw does the chip-specific initialization of the MMU hardware. | |
253 | */ | |
254 | static void __init mmu_init_hw(void) | |
255 | { | |
256 | /* | |
257 | * The Zone Protection Register (ZPR) defines how protection will | |
258 | * be applied to every page which is a member of a given zone. At | |
259 | * present, we utilize only two of the zones. | |
260 | * The zone index bits (of ZSEL) in the PTE are used for software | |
261 | * indicators, except the LSB. For user access, zone 1 is used, | |
262 | * for kernel access, zone 0 is used. We set all but zone 1 | |
263 | * to zero, allowing only kernel access as indicated in the PTE. | |
264 | * For zone 1, we set a 01 binary (a value of 10 will not work) | |
265 | * to allow user access as indicated in the PTE. This also allows | |
266 | * kernel access as indicated in the PTE. | |
267 | */ | |
268 | __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ | |
269 | "mts rzpr, r11;" | |
270 | : : : "r11"); | |
271 | } | |
272 | ||
273 | /* | |
274 | * MMU_init sets up the basic memory mappings for the kernel, | |
275 | * including both RAM and possibly some I/O regions, | |
276 | * and sets up the page tables and the MMU hardware ready to go. | |
277 | */ | |
278 | ||
279 | /* called from head.S */ | |
280 | asmlinkage void __init mmu_init(void) | |
281 | { | |
282 | unsigned int kstart, ksize; | |
283 | ||
284 | if (!lmb.reserved.cnt) { | |
285 | printk(KERN_EMERG "Error memory count\n"); | |
286 | machine_restart(NULL); | |
287 | } | |
288 | ||
289 | if ((u32) lmb.memory.region[0].size < 0x1000000) { | |
290 | printk(KERN_EMERG "Memory must be greater than 16MB\n"); | |
291 | machine_restart(NULL); | |
292 | } | |
293 | /* Find main memory where the kernel is */ | |
294 | memory_start = (u32) lmb.memory.region[0].base; | |
295 | memory_end = (u32) lmb.memory.region[0].base + | |
296 | (u32) lmb.memory.region[0].size; | |
297 | memory_size = memory_end - memory_start; | |
298 | ||
299 | mm_cmdline_setup(); /* FIXME parse args from command line - not used */ | |
300 | ||
301 | /* | |
302 | * Map out the kernel text/data/bss from the available physical | |
303 | * memory. | |
304 | */ | |
305 | kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ | |
306 | /* kernel size */ | |
307 | ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); | |
308 | lmb_reserve(kstart, ksize); | |
309 | ||
310 | #if defined(CONFIG_BLK_DEV_INITRD) | |
311 | /* Remove the init RAM disk from the available memory. */ | |
312 | /* if (initrd_start) { | |
313 | mem_pieces_remove(&phys_avail, __pa(initrd_start), | |
314 | initrd_end - initrd_start, 1); | |
315 | }*/ | |
316 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
317 | ||
318 | /* Initialize the MMU hardware */ | |
319 | mmu_init_hw(); | |
320 | ||
321 | /* Map in all of RAM starting at CONFIG_KERNEL_START */ | |
322 | mapin_ram(); | |
323 | ||
324 | #ifdef HIGHMEM_START_BOOL | |
325 | ioremap_base = HIGHMEM_START; | |
326 | #else | |
327 | ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ | |
328 | #endif /* CONFIG_HIGHMEM */ | |
329 | ioremap_bot = ioremap_base; | |
330 | ||
331 | /* Initialize the context management stuff */ | |
332 | mmu_context_init(); | |
333 | } | |
334 | ||
335 | /* This is only called until mem_init is done. */ | |
336 | void __init *early_get_page(void) | |
337 | { | |
338 | void *p; | |
339 | if (init_bootmem_done) { | |
340 | p = alloc_bootmem_pages(PAGE_SIZE); | |
341 | } else { | |
342 | /* | |
343 | * Mem start + 32MB -> here is limit | |
344 | * because of mem mapping from head.S | |
345 | */ | |
346 | p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE, | |
347 | memory_start + 0x2000000)); | |
348 | } | |
349 | return p; | |
350 | } | |
351 | #endif /* CONFIG_MMU */ |