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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#include <linux/export.h>
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>
27#include <asm/fixmap.h>
28
29/* Use for MMU and noMMU because of PCI generic code */
30int mem_init_done;
31
32#ifndef CONFIG_MMU
33unsigned int __page_offset;
34EXPORT_SYMBOL(__page_offset);
35#endif /* CONFIG_MMU */
36
37char *klimit = _end;
38
39/*
40 * Initialize the bootmem system and give it all the memory we
41 * have available.
42 */
43unsigned long memory_start;
44EXPORT_SYMBOL(memory_start);
45unsigned long memory_size;
46EXPORT_SYMBOL(memory_size);
47unsigned long lowmem_size;
48
49#ifdef CONFIG_HIGHMEM
50pte_t *kmap_pte;
51EXPORT_SYMBOL(kmap_pte);
52pgprot_t kmap_prot;
53EXPORT_SYMBOL(kmap_prot);
54
55static 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
61static 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
71static void highmem_setup(void)
72{
73 unsigned long pfn;
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 */
79 if (!memblock_is_reserved(pfn << PAGE_SHIFT))
80 free_highmem_page(page);
81 }
82}
83#endif /* CONFIG_HIGHMEM */
84
85/*
86 * paging_init() sets up the page tables - in fact we've already done this.
87 */
88static void __init paging_init(void)
89{
90 unsigned long zones_size[MAX_NR_ZONES];
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
98
99 /* Clean every zones */
100 memset(zones_size, 0, sizeof(zones_size));
101
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
108 zones_size[ZONE_DMA] = max_pfn;
109#endif
110
111 /* We don't have holes in memory map */
112 free_area_init_nodes(zones_size);
113}
114
115void __init setup_memory(void)
116{
117 struct memblock_region *reg;
118
119#ifndef CONFIG_MMU
120 u32 kernel_align_start, kernel_align_size;
121
122 /* Find main memory where is the kernel */
123 for_each_memblock(memory, reg) {
124 memory_start = (u32)reg->base;
125 lowmem_size = reg->size;
126 if ((memory_start <= (u32)_text) &&
127 ((u32)_text <= (memory_start + lowmem_size - 1))) {
128 memory_size = lowmem_size;
129 PAGE_OFFSET = memory_start;
130 pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
131 __func__, (u32) memory_start,
132 (u32) memory_size);
133 break;
134 }
135 }
136
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);
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;
146 pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
147 __func__, kernel_align_start, kernel_align_start
148 + kernel_align_size, kernel_align_size);
149 memblock_reserve(kernel_align_start, kernel_align_size);
150#endif
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)
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 */
164 max_mapnr = memory_size >> PAGE_SHIFT;
165 max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
166 max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
167
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);
172
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,
180 (end_pfn - start_pfn) << PAGE_SHIFT,
181 &memblock.memory, 0);
182 }
183
184 /* XXX need to clip this if using highmem? */
185 sparse_memory_present_with_active_regions(0);
186
187 paging_init();
188}
189
190#ifdef CONFIG_BLK_DEV_INITRD
191void free_initrd_mem(unsigned long start, unsigned long end)
192{
193 free_reserved_area((void *)start, (void *)end, -1, "initrd");
194}
195#endif
196
197void free_initmem(void)
198{
199 free_initmem_default(-1);
200}
201
202void __init mem_init(void)
203{
204 high_memory = (void *)__va(memory_start + lowmem_size - 1);
205
206 /* this will put all memory onto the freelists */
207 free_all_bootmem();
208#ifdef CONFIG_HIGHMEM
209 highmem_setup();
210#endif
211
212 mem_init_print_info(NULL);
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);
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 */
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
225 mem_init_done = 1;
226}
227
228#ifndef CONFIG_MMU
229int page_is_ram(unsigned long pfn)
230{
231 return __range_ok(pfn, 0);
232}
233#else
234int 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 */
242static 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;
254 memblock.memory.regions[0].size = memory_size;
255 }
256 }
257}
258
259/*
260 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
261 */
262static 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 */
288asmlinkage void __init mmu_init(void)
289{
290 unsigned int kstart, ksize;
291
292 if (!memblock.reserved.cnt) {
293 pr_emerg("Error memory count\n");
294 machine_restart(NULL);
295 }
296
297 if ((u32) memblock.memory.regions[0].size < 0x400000) {
298 pr_emerg("Memory must be greater than 4MB\n");
299 machine_restart(NULL);
300 }
301
302 if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
303 pr_emerg("Kernel size is greater than memory node\n");
304 machine_restart(NULL);
305 }
306
307 /* Find main memory where the kernel is */
308 memory_start = (u32) memblock.memory.regions[0].base;
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;
313#ifndef CONFIG_HIGHMEM
314 memory_size = lowmem_size;
315#endif
316 }
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));
327 memblock_reserve(kstart, ksize);
328
329#if defined(CONFIG_BLK_DEV_INITRD)
330 /* Remove the init RAM disk from the available memory. */
331 if (initrd_start) {
332 unsigned long size;
333 size = initrd_end - initrd_start;
334 memblock_reserve(__virt_to_phys(initrd_start), size);
335 }
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
344 /* Extend vmalloc and ioremap area as big as possible */
345#ifdef CONFIG_HIGHMEM
346 ioremap_base = ioremap_bot = PKMAP_BASE;
347#else
348 ioremap_base = ioremap_bot = FIXADDR_START;
349#endif
350
351 /* Initialize the context management stuff */
352 mmu_context_init();
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);
358}
359
360/* This is only called until mem_init is done. */
361void __init *early_get_page(void)
362{
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));
369}
370
371#endif /* CONFIG_MMU */
372
373void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
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}
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#include <linux/export.h>
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>
27#include <asm/fixmap.h>
28
29/* Use for MMU and noMMU because of PCI generic code */
30int mem_init_done;
31
32#ifndef CONFIG_MMU
33unsigned int __page_offset;
34EXPORT_SYMBOL(__page_offset);
35
36#else
37static int init_bootmem_done;
38#endif /* CONFIG_MMU */
39
40char *klimit = _end;
41
42/*
43 * Initialize the bootmem system and give it all the memory we
44 * have available.
45 */
46unsigned long memory_start;
47EXPORT_SYMBOL(memory_start);
48unsigned long memory_size;
49EXPORT_SYMBOL(memory_size);
50unsigned long lowmem_size;
51
52#ifdef CONFIG_HIGHMEM
53pte_t *kmap_pte;
54EXPORT_SYMBOL(kmap_pte);
55pgprot_t kmap_prot;
56EXPORT_SYMBOL(kmap_prot);
57
58static 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
64static 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
74static void highmem_setup(void)
75{
76 unsigned long pfn;
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 */
82 if (!memblock_is_reserved(pfn << PAGE_SHIFT))
83 free_highmem_page(page);
84 }
85}
86#endif /* CONFIG_HIGHMEM */
87
88/*
89 * paging_init() sets up the page tables - in fact we've already done this.
90 */
91static void __init paging_init(void)
92{
93 unsigned long zones_size[MAX_NR_ZONES];
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
101
102 /* Clean every zones */
103 memset(zones_size, 0, sizeof(zones_size));
104
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
111 zones_size[ZONE_DMA] = max_pfn;
112#endif
113
114 /* We don't have holes in memory map */
115 free_area_init_nodes(zones_size);
116}
117
118void __init setup_memory(void)
119{
120 unsigned long map_size;
121 struct memblock_region *reg;
122
123#ifndef CONFIG_MMU
124 u32 kernel_align_start, kernel_align_size;
125
126 /* Find main memory where is the kernel */
127 for_each_memblock(memory, reg) {
128 memory_start = (u32)reg->base;
129 lowmem_size = reg->size;
130 if ((memory_start <= (u32)_text) &&
131 ((u32)_text <= (memory_start + lowmem_size - 1))) {
132 memory_size = lowmem_size;
133 PAGE_OFFSET = memory_start;
134 pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
135 __func__, (u32) memory_start,
136 (u32) memory_size);
137 break;
138 }
139 }
140
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);
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;
150 pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
151 __func__, kernel_align_start, kernel_align_start
152 + kernel_align_size, kernel_align_size);
153 memblock_reserve(kernel_align_start, kernel_align_size);
154#endif
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)
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 */
168 max_mapnr = memory_size >> PAGE_SHIFT;
169 max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
170 max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
171
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);
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 */
184 map_size = init_bootmem_node(NODE_DATA(0),
185 PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
186 memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
187
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,
195 (end_pfn - start_pfn) << PAGE_SHIFT,
196 &memblock.memory, 0);
197 }
198
199 /* free bootmem is whole main memory */
200 free_bootmem_with_active_regions(0, max_low_pfn);
201
202 /* reserve allocate blocks */
203 for_each_memblock(reserved, reg) {
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 }
217 }
218
219 /* XXX need to clip this if using highmem? */
220 sparse_memory_present_with_active_regions(0);
221
222#ifdef CONFIG_MMU
223 init_bootmem_done = 1;
224#endif
225 paging_init();
226}
227
228#ifdef CONFIG_BLK_DEV_INITRD
229void free_initrd_mem(unsigned long start, unsigned long end)
230{
231 free_reserved_area((void *)start, (void *)end, -1, "initrd");
232}
233#endif
234
235void free_initmem(void)
236{
237 free_initmem_default(-1);
238}
239
240void __init mem_init(void)
241{
242 high_memory = (void *)__va(memory_start + lowmem_size - 1);
243
244 /* this will put all memory onto the freelists */
245 free_all_bootmem();
246#ifdef CONFIG_HIGHMEM
247 highmem_setup();
248#endif
249
250 mem_init_print_info(NULL);
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);
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 */
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
263 mem_init_done = 1;
264}
265
266#ifndef CONFIG_MMU
267int page_is_ram(unsigned long pfn)
268{
269 return __range_ok(pfn, 0);
270}
271#else
272int 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 */
280static 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;
292 memblock.memory.regions[0].size = memory_size;
293 }
294 }
295}
296
297/*
298 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
299 */
300static 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 */
326asmlinkage void __init mmu_init(void)
327{
328 unsigned int kstart, ksize;
329
330 if (!memblock.reserved.cnt) {
331 pr_emerg("Error memory count\n");
332 machine_restart(NULL);
333 }
334
335 if ((u32) memblock.memory.regions[0].size < 0x400000) {
336 pr_emerg("Memory must be greater than 4MB\n");
337 machine_restart(NULL);
338 }
339
340 if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
341 pr_emerg("Kernel size is greater than memory node\n");
342 machine_restart(NULL);
343 }
344
345 /* Find main memory where the kernel is */
346 memory_start = (u32) memblock.memory.regions[0].base;
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;
351#ifndef CONFIG_HIGHMEM
352 memory_size = lowmem_size;
353#endif
354 }
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));
365 memblock_reserve(kstart, ksize);
366
367#if defined(CONFIG_BLK_DEV_INITRD)
368 /* Remove the init RAM disk from the available memory. */
369 if (initrd_start) {
370 unsigned long size;
371 size = initrd_end - initrd_start;
372 memblock_reserve(__virt_to_phys(initrd_start), size);
373 }
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
382 /* Extend vmalloc and ioremap area as big as possible */
383#ifdef CONFIG_HIGHMEM
384 ioremap_base = ioremap_bot = PKMAP_BASE;
385#else
386 ioremap_base = ioremap_bot = FIXADDR_START;
387#endif
388
389 /* Initialize the context management stuff */
390 mmu_context_init();
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);
396}
397
398/* This is only called until mem_init is done. */
399void __init *early_get_page(void)
400{
401 void *p;
402 if (init_bootmem_done) {
403 p = alloc_bootmem_pages(PAGE_SIZE);
404 } else {
405 /*
406 * Mem start + kernel_tlb -> here is limit
407 * because of mem mapping from head.S
408 */
409 p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
410 memory_start + kernel_tlb));
411 }
412 return p;
413}
414
415#endif /* CONFIG_MMU */
416
417void * __ref alloc_maybe_bootmem(size_t size, gfp_t mask)
418{
419 if (mem_init_done)
420 return kmalloc(size, mask);
421 else
422 return alloc_bootmem(size);
423}
424
425void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
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}