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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/memblock.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/mm.h> /* mem_init */
14#include <linux/initrd.h>
15#include <linux/pagemap.h>
16#include <linux/pfn.h>
17#include <linux/slab.h>
18#include <linux/swap.h>
19#include <linux/export.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#include <asm/fixmap.h>
27
28/* Use for MMU and noMMU because of PCI generic code */
29int mem_init_done;
30
31#ifndef CONFIG_MMU
32unsigned int __page_offset;
33EXPORT_SYMBOL(__page_offset);
34#endif /* CONFIG_MMU */
35
36char *klimit = _end;
37
38/*
39 * Initialize the bootmem system and give it all the memory we
40 * have available.
41 */
42unsigned long memory_start;
43EXPORT_SYMBOL(memory_start);
44unsigned long memory_size;
45EXPORT_SYMBOL(memory_size);
46unsigned long lowmem_size;
47
48#ifdef CONFIG_HIGHMEM
49pte_t *kmap_pte;
50EXPORT_SYMBOL(kmap_pte);
51pgprot_t kmap_prot;
52EXPORT_SYMBOL(kmap_prot);
53
54static inline pte_t *virt_to_kpte(unsigned long vaddr)
55{
56 return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr),
57 vaddr), vaddr);
58}
59
60static void __init highmem_init(void)
61{
62 pr_debug("%x\n", (u32)PKMAP_BASE);
63 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
64 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
65
66 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
67 kmap_prot = PAGE_KERNEL;
68}
69
70static void highmem_setup(void)
71{
72 unsigned long pfn;
73
74 for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
75 struct page *page = pfn_to_page(pfn);
76
77 /* FIXME not sure about */
78 if (!memblock_is_reserved(pfn << PAGE_SHIFT))
79 free_highmem_page(page);
80 }
81}
82#endif /* CONFIG_HIGHMEM */
83
84/*
85 * paging_init() sets up the page tables - in fact we've already done this.
86 */
87static void __init paging_init(void)
88{
89 unsigned long zones_size[MAX_NR_ZONES];
90#ifdef CONFIG_MMU
91 int idx;
92
93 /* Setup fixmaps */
94 for (idx = 0; idx < __end_of_fixed_addresses; idx++)
95 clear_fixmap(idx);
96#endif
97
98 /* Clean every zones */
99 memset(zones_size, 0, sizeof(zones_size));
100
101#ifdef CONFIG_HIGHMEM
102 highmem_init();
103
104 zones_size[ZONE_DMA] = max_low_pfn;
105 zones_size[ZONE_HIGHMEM] = max_pfn;
106#else
107 zones_size[ZONE_DMA] = max_pfn;
108#endif
109
110 /* We don't have holes in memory map */
111 free_area_init_nodes(zones_size);
112}
113
114void __init setup_memory(void)
115{
116 struct memblock_region *reg;
117
118#ifndef CONFIG_MMU
119 u32 kernel_align_start, kernel_align_size;
120
121 /* Find main memory where is the kernel */
122 for_each_memblock(memory, reg) {
123 memory_start = (u32)reg->base;
124 lowmem_size = reg->size;
125 if ((memory_start <= (u32)_text) &&
126 ((u32)_text <= (memory_start + lowmem_size - 1))) {
127 memory_size = lowmem_size;
128 PAGE_OFFSET = memory_start;
129 pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
130 __func__, (u32) memory_start,
131 (u32) memory_size);
132 break;
133 }
134 }
135
136 if (!memory_start || !memory_size) {
137 panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
138 __func__, (u32) memory_start, (u32) memory_size);
139 }
140
141 /* reservation of region where is the kernel */
142 kernel_align_start = PAGE_DOWN((u32)_text);
143 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
144 kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
145 pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
146 __func__, kernel_align_start, kernel_align_start
147 + kernel_align_size, kernel_align_size);
148 memblock_reserve(kernel_align_start, kernel_align_size);
149#endif
150 /*
151 * Kernel:
152 * start: base phys address of kernel - page align
153 * end: base phys address of kernel - page align
154 *
155 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
156 * max_low_pfn
157 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
158 */
159
160 /* memory start is from the kernel end (aligned) to higher addr */
161 min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
162 /* RAM is assumed contiguous */
163 max_mapnr = memory_size >> PAGE_SHIFT;
164 max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
165 max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
166
167 pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
168 pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
169 pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
170 pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
171
172 /* Add active regions with valid PFNs */
173 for_each_memblock(memory, reg) {
174 unsigned long start_pfn, end_pfn;
175
176 start_pfn = memblock_region_memory_base_pfn(reg);
177 end_pfn = memblock_region_memory_end_pfn(reg);
178 memblock_set_node(start_pfn << PAGE_SHIFT,
179 (end_pfn - start_pfn) << PAGE_SHIFT,
180 &memblock.memory, 0);
181 }
182
183 /* XXX need to clip this if using highmem? */
184 sparse_memory_present_with_active_regions(0);
185
186 paging_init();
187}
188
189void __init mem_init(void)
190{
191 high_memory = (void *)__va(memory_start + lowmem_size - 1);
192
193 /* this will put all memory onto the freelists */
194 memblock_free_all();
195#ifdef CONFIG_HIGHMEM
196 highmem_setup();
197#endif
198
199 mem_init_print_info(NULL);
200#ifdef CONFIG_MMU
201 pr_info("Kernel virtual memory layout:\n");
202 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
203#ifdef CONFIG_HIGHMEM
204 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
205 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
206#endif /* CONFIG_HIGHMEM */
207 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
208 ioremap_bot, ioremap_base);
209 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
210 (unsigned long)VMALLOC_START, VMALLOC_END);
211#endif
212 mem_init_done = 1;
213}
214
215#ifndef CONFIG_MMU
216int page_is_ram(unsigned long pfn)
217{
218 return __range_ok(pfn, 0);
219}
220#else
221int page_is_ram(unsigned long pfn)
222{
223 return pfn < max_low_pfn;
224}
225
226/*
227 * Check for command-line options that affect what MMU_init will do.
228 */
229static void mm_cmdline_setup(void)
230{
231 unsigned long maxmem = 0;
232 char *p = cmd_line;
233
234 /* Look for mem= option on command line */
235 p = strstr(cmd_line, "mem=");
236 if (p) {
237 p += 4;
238 maxmem = memparse(p, &p);
239 if (maxmem && memory_size > maxmem) {
240 memory_size = maxmem;
241 memblock.memory.regions[0].size = memory_size;
242 }
243 }
244}
245
246/*
247 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
248 */
249static void __init mmu_init_hw(void)
250{
251 /*
252 * The Zone Protection Register (ZPR) defines how protection will
253 * be applied to every page which is a member of a given zone. At
254 * present, we utilize only two of the zones.
255 * The zone index bits (of ZSEL) in the PTE are used for software
256 * indicators, except the LSB. For user access, zone 1 is used,
257 * for kernel access, zone 0 is used. We set all but zone 1
258 * to zero, allowing only kernel access as indicated in the PTE.
259 * For zone 1, we set a 01 binary (a value of 10 will not work)
260 * to allow user access as indicated in the PTE. This also allows
261 * kernel access as indicated in the PTE.
262 */
263 __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
264 "mts rzpr, r11;"
265 : : : "r11");
266}
267
268/*
269 * MMU_init sets up the basic memory mappings for the kernel,
270 * including both RAM and possibly some I/O regions,
271 * and sets up the page tables and the MMU hardware ready to go.
272 */
273
274/* called from head.S */
275asmlinkage void __init mmu_init(void)
276{
277 unsigned int kstart, ksize;
278
279 if (!memblock.reserved.cnt) {
280 pr_emerg("Error memory count\n");
281 machine_restart(NULL);
282 }
283
284 if ((u32) memblock.memory.regions[0].size < 0x400000) {
285 pr_emerg("Memory must be greater than 4MB\n");
286 machine_restart(NULL);
287 }
288
289 if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
290 pr_emerg("Kernel size is greater than memory node\n");
291 machine_restart(NULL);
292 }
293
294 /* Find main memory where the kernel is */
295 memory_start = (u32) memblock.memory.regions[0].base;
296 lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
297
298 if (lowmem_size > CONFIG_LOWMEM_SIZE) {
299 lowmem_size = CONFIG_LOWMEM_SIZE;
300#ifndef CONFIG_HIGHMEM
301 memory_size = lowmem_size;
302#endif
303 }
304
305 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
306
307 /*
308 * Map out the kernel text/data/bss from the available physical
309 * memory.
310 */
311 kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
312 /* kernel size */
313 ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
314 memblock_reserve(kstart, ksize);
315
316#if defined(CONFIG_BLK_DEV_INITRD)
317 /* Remove the init RAM disk from the available memory. */
318 if (initrd_start) {
319 unsigned long size;
320 size = initrd_end - initrd_start;
321 memblock_reserve(__virt_to_phys(initrd_start), size);
322 }
323#endif /* CONFIG_BLK_DEV_INITRD */
324
325 /* Initialize the MMU hardware */
326 mmu_init_hw();
327
328 /* Map in all of RAM starting at CONFIG_KERNEL_START */
329 mapin_ram();
330
331 /* Extend vmalloc and ioremap area as big as possible */
332#ifdef CONFIG_HIGHMEM
333 ioremap_base = ioremap_bot = PKMAP_BASE;
334#else
335 ioremap_base = ioremap_bot = FIXADDR_START;
336#endif
337
338 /* Initialize the context management stuff */
339 mmu_context_init();
340
341 /* Shortly after that, the entire linear mapping will be available */
342 /* This will also cause that unflatten device tree will be allocated
343 * inside 768MB limit */
344 memblock_set_current_limit(memory_start + lowmem_size - 1);
345}
346
347/* This is only called until mem_init is done. */
348void __init *early_get_page(void)
349{
350 /*
351 * Mem start + kernel_tlb -> here is limit
352 * because of mem mapping from head.S
353 */
354 return memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
355 MEMBLOCK_LOW_LIMIT, memory_start + kernel_tlb,
356 NUMA_NO_NODE);
357}
358
359#endif /* CONFIG_MMU */
360
361void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
362{
363 void *p;
364
365 if (mem_init_done) {
366 p = kzalloc(size, mask);
367 } else {
368 p = memblock_alloc(size, SMP_CACHE_BYTES);
369 if (!p)
370 panic("%s: Failed to allocate %zu bytes\n",
371 __func__, size);
372 }
373
374 return p;
375}