2 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2006 Atmark Techno, Inc.
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
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>
23 #include <asm/mmu_context.h>
24 #include <asm/pgalloc.h>
25 #include <asm/sections.h>
27 #include <asm/fixmap.h>
29 /* Use for MMU and noMMU because of PCI generic code */
33 unsigned int __page_offset
;
34 EXPORT_SYMBOL(__page_offset
);
37 static int init_bootmem_done
;
38 #endif /* CONFIG_MMU */
43 * Initialize the bootmem system and give it all the memory we
46 unsigned long memory_start
;
47 EXPORT_SYMBOL(memory_start
);
48 unsigned long memory_size
;
49 EXPORT_SYMBOL(memory_size
);
50 unsigned long lowmem_size
;
54 EXPORT_SYMBOL(kmap_pte
);
56 EXPORT_SYMBOL(kmap_prot
);
58 static inline pte_t
*virt_to_kpte(unsigned long vaddr
)
60 return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr
),
64 static void __init
highmem_init(void)
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
);
70 kmap_pte
= virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN
));
71 kmap_prot
= PAGE_KERNEL
;
74 static unsigned long highmem_setup(void)
77 unsigned long reservedpages
= 0;
79 for (pfn
= max_low_pfn
; pfn
< max_pfn
; ++pfn
) {
80 struct page
*page
= pfn_to_page(pfn
);
82 /* FIXME not sure about */
83 if (memblock_is_reserved(pfn
<< PAGE_SHIFT
))
85 free_highmem_page(page
);
88 pr_info("High memory: %luk\n",
89 totalhigh_pages
<< (PAGE_SHIFT
-10));
93 #endif /* CONFIG_HIGHMEM */
96 * paging_init() sets up the page tables - in fact we've already done this.
98 static void __init
paging_init(void)
100 unsigned long zones_size
[MAX_NR_ZONES
];
105 for (idx
= 0; idx
< __end_of_fixed_addresses
; idx
++)
109 /* Clean every zones */
110 memset(zones_size
, 0, sizeof(zones_size
));
112 #ifdef CONFIG_HIGHMEM
115 zones_size
[ZONE_DMA
] = max_low_pfn
;
116 zones_size
[ZONE_HIGHMEM
] = max_pfn
;
118 zones_size
[ZONE_DMA
] = max_pfn
;
121 /* We don't have holes in memory map */
122 free_area_init_nodes(zones_size
);
125 void __init
setup_memory(void)
127 unsigned long map_size
;
128 struct memblock_region
*reg
;
131 u32 kernel_align_start
, kernel_align_size
;
133 /* Find main memory where is the kernel */
134 for_each_memblock(memory
, reg
) {
135 memory_start
= (u32
)reg
->base
;
136 lowmem_size
= reg
->size
;
137 if ((memory_start
<= (u32
)_text
) &&
138 ((u32
)_text
<= (memory_start
+ lowmem_size
- 1))) {
139 memory_size
= lowmem_size
;
140 PAGE_OFFSET
= memory_start
;
141 pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
142 __func__
, (u32
) memory_start
,
148 if (!memory_start
|| !memory_size
) {
149 panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
150 __func__
, (u32
) memory_start
, (u32
) memory_size
);
153 /* reservation of region where is the kernel */
154 kernel_align_start
= PAGE_DOWN((u32
)_text
);
155 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
156 kernel_align_size
= PAGE_UP((u32
)klimit
) - kernel_align_start
;
157 pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
158 __func__
, kernel_align_start
, kernel_align_start
159 + kernel_align_size
, kernel_align_size
);
160 memblock_reserve(kernel_align_start
, kernel_align_size
);
164 * start: base phys address of kernel - page align
165 * end: base phys address of kernel - page align
167 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
169 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
170 * num_physpages - number of all pages
173 /* memory start is from the kernel end (aligned) to higher addr */
174 min_low_pfn
= memory_start
>> PAGE_SHIFT
; /* minimum for allocation */
175 /* RAM is assumed contiguous */
176 num_physpages
= max_mapnr
= memory_size
>> PAGE_SHIFT
;
177 max_low_pfn
= ((u64
)memory_start
+ (u64
)lowmem_size
) >> PAGE_SHIFT
;
178 max_pfn
= ((u64
)memory_start
+ (u64
)memory_size
) >> PAGE_SHIFT
;
180 pr_info("%s: max_mapnr: %#lx\n", __func__
, max_mapnr
);
181 pr_info("%s: min_low_pfn: %#lx\n", __func__
, min_low_pfn
);
182 pr_info("%s: max_low_pfn: %#lx\n", __func__
, max_low_pfn
);
183 pr_info("%s: max_pfn: %#lx\n", __func__
, max_pfn
);
186 * Find an area to use for the bootmem bitmap.
187 * We look for the first area which is at least
188 * 128kB in length (128kB is enough for a bitmap
189 * for 4GB of memory, using 4kB pages), plus 1 page
190 * (in case the address isn't page-aligned).
192 map_size
= init_bootmem_node(NODE_DATA(0),
193 PFN_UP(TOPHYS((u32
)klimit
)), min_low_pfn
, max_low_pfn
);
194 memblock_reserve(PFN_UP(TOPHYS((u32
)klimit
)) << PAGE_SHIFT
, map_size
);
196 /* Add active regions with valid PFNs */
197 for_each_memblock(memory
, reg
) {
198 unsigned long start_pfn
, end_pfn
;
200 start_pfn
= memblock_region_memory_base_pfn(reg
);
201 end_pfn
= memblock_region_memory_end_pfn(reg
);
202 memblock_set_node(start_pfn
<< PAGE_SHIFT
,
203 (end_pfn
- start_pfn
) << PAGE_SHIFT
, 0);
206 /* free bootmem is whole main memory */
207 free_bootmem_with_active_regions(0, max_low_pfn
);
209 /* reserve allocate blocks */
210 for_each_memblock(reserved
, reg
) {
211 unsigned long top
= reg
->base
+ reg
->size
- 1;
213 pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
214 (u32
) reg
->base
, (u32
) reg
->size
, top
,
215 memory_start
+ lowmem_size
- 1);
217 if (top
<= (memory_start
+ lowmem_size
- 1)) {
218 reserve_bootmem(reg
->base
, reg
->size
, BOOTMEM_DEFAULT
);
219 } else if (reg
->base
< (memory_start
+ lowmem_size
- 1)) {
220 unsigned long trunc_size
= memory_start
+ lowmem_size
-
222 reserve_bootmem(reg
->base
, trunc_size
, BOOTMEM_DEFAULT
);
226 /* XXX need to clip this if using highmem? */
227 sparse_memory_present_with_active_regions(0);
230 init_bootmem_done
= 1;
235 #ifdef CONFIG_BLK_DEV_INITRD
236 void free_initrd_mem(unsigned long start
, unsigned long end
)
238 free_reserved_area(start
, end
, 0, "initrd");
242 void free_initmem(void)
244 free_initmem_default(0);
247 void __init
mem_init(void)
250 unsigned long reservedpages
= 0, codesize
, initsize
, datasize
, bsssize
;
252 high_memory
= (void *)__va(memory_start
+ lowmem_size
- 1);
254 /* this will put all memory onto the freelists */
255 totalram_pages
+= free_all_bootmem();
257 for_each_online_pgdat(pgdat
) {
261 for (i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
262 if (!pfn_valid(pgdat
->node_start_pfn
+ i
))
264 page
= pgdat_page_nr(pgdat
, i
);
265 if (PageReserved(page
))
270 #ifdef CONFIG_HIGHMEM
271 reservedpages
-= highmem_setup();
274 codesize
= (unsigned long)&_sdata
- (unsigned long)&_stext
;
275 datasize
= (unsigned long)&_edata
- (unsigned long)&_sdata
;
276 initsize
= (unsigned long)&__init_end
- (unsigned long)&__init_begin
;
277 bsssize
= (unsigned long)&__bss_stop
- (unsigned long)&__bss_start
;
279 pr_info("Memory: %luk/%luk available (%luk kernel code, ",
280 nr_free_pages() << (PAGE_SHIFT
-10),
281 num_physpages
<< (PAGE_SHIFT
-10),
283 pr_cont("%luk reserved, %luk data, %luk bss, %luk init)\n",
284 reservedpages
<< (PAGE_SHIFT
-10),
290 pr_info("Kernel virtual memory layout:\n");
291 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START
, FIXADDR_TOP
);
292 #ifdef CONFIG_HIGHMEM
293 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
294 PKMAP_BASE
, PKMAP_ADDR(LAST_PKMAP
));
295 #endif /* CONFIG_HIGHMEM */
296 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
297 ioremap_bot
, ioremap_base
);
298 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
299 (unsigned long)VMALLOC_START
, VMALLOC_END
);
305 int page_is_ram(unsigned long pfn
)
307 return __range_ok(pfn
, 0);
310 int page_is_ram(unsigned long pfn
)
312 return pfn
< max_low_pfn
;
316 * Check for command-line options that affect what MMU_init will do.
318 static void mm_cmdline_setup(void)
320 unsigned long maxmem
= 0;
323 /* Look for mem= option on command line */
324 p
= strstr(cmd_line
, "mem=");
327 maxmem
= memparse(p
, &p
);
328 if (maxmem
&& memory_size
> maxmem
) {
329 memory_size
= maxmem
;
330 memblock
.memory
.regions
[0].size
= memory_size
;
336 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
338 static void __init
mmu_init_hw(void)
341 * The Zone Protection Register (ZPR) defines how protection will
342 * be applied to every page which is a member of a given zone. At
343 * present, we utilize only two of the zones.
344 * The zone index bits (of ZSEL) in the PTE are used for software
345 * indicators, except the LSB. For user access, zone 1 is used,
346 * for kernel access, zone 0 is used. We set all but zone 1
347 * to zero, allowing only kernel access as indicated in the PTE.
348 * For zone 1, we set a 01 binary (a value of 10 will not work)
349 * to allow user access as indicated in the PTE. This also allows
350 * kernel access as indicated in the PTE.
352 __asm__
__volatile__ ("ori r11, r0, 0x10000000;" \
358 * MMU_init sets up the basic memory mappings for the kernel,
359 * including both RAM and possibly some I/O regions,
360 * and sets up the page tables and the MMU hardware ready to go.
363 /* called from head.S */
364 asmlinkage
void __init
mmu_init(void)
366 unsigned int kstart
, ksize
;
368 if (!memblock
.reserved
.cnt
) {
369 pr_emerg("Error memory count\n");
370 machine_restart(NULL
);
373 if ((u32
) memblock
.memory
.regions
[0].size
< 0x400000) {
374 pr_emerg("Memory must be greater than 4MB\n");
375 machine_restart(NULL
);
378 if ((u32
) memblock
.memory
.regions
[0].size
< kernel_tlb
) {
379 pr_emerg("Kernel size is greater than memory node\n");
380 machine_restart(NULL
);
383 /* Find main memory where the kernel is */
384 memory_start
= (u32
) memblock
.memory
.regions
[0].base
;
385 lowmem_size
= memory_size
= (u32
) memblock
.memory
.regions
[0].size
;
387 if (lowmem_size
> CONFIG_LOWMEM_SIZE
) {
388 lowmem_size
= CONFIG_LOWMEM_SIZE
;
389 #ifndef CONFIG_HIGHMEM
390 memory_size
= lowmem_size
;
394 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
397 * Map out the kernel text/data/bss from the available physical
400 kstart
= __pa(CONFIG_KERNEL_START
); /* kernel start */
402 ksize
= PAGE_ALIGN(((u32
)_end
- (u32
)CONFIG_KERNEL_START
));
403 memblock_reserve(kstart
, ksize
);
405 #if defined(CONFIG_BLK_DEV_INITRD)
406 /* Remove the init RAM disk from the available memory. */
409 size
= initrd_end
- initrd_start
;
410 memblock_reserve(virt_to_phys(initrd_start
), size
);
412 #endif /* CONFIG_BLK_DEV_INITRD */
414 /* Initialize the MMU hardware */
417 /* Map in all of RAM starting at CONFIG_KERNEL_START */
420 /* Extend vmalloc and ioremap area as big as possible */
421 #ifdef CONFIG_HIGHMEM
422 ioremap_base
= ioremap_bot
= PKMAP_BASE
;
424 ioremap_base
= ioremap_bot
= FIXADDR_START
;
427 /* Initialize the context management stuff */
430 /* Shortly after that, the entire linear mapping will be available */
431 /* This will also cause that unflatten device tree will be allocated
432 * inside 768MB limit */
433 memblock_set_current_limit(memory_start
+ lowmem_size
- 1);
436 /* This is only called until mem_init is done. */
437 void __init
*early_get_page(void)
440 if (init_bootmem_done
) {
441 p
= alloc_bootmem_pages(PAGE_SIZE
);
444 * Mem start + kernel_tlb -> here is limit
445 * because of mem mapping from head.S
447 p
= __va(memblock_alloc_base(PAGE_SIZE
, PAGE_SIZE
,
448 memory_start
+ kernel_tlb
));
453 #endif /* CONFIG_MMU */
455 void * __init_refok
alloc_maybe_bootmem(size_t size
, gfp_t mask
)
458 return kmalloc(size
, mask
);
460 return alloc_bootmem(size
);
463 void * __init_refok
zalloc_maybe_bootmem(size_t size
, gfp_t mask
)
468 p
= kzalloc(size
, mask
);
470 p
= alloc_bootmem(size
);