2 * linux/arch/arm/mm/init.c
4 * Copyright (C) 1995-2005 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/swap.h>
13 #include <linux/init.h>
14 #include <linux/bootmem.h>
15 #include <linux/mman.h>
16 #include <linux/nodemask.h>
17 #include <linux/initrd.h>
18 #include <linux/highmem.h>
19 #include <linux/gfp.h>
20 #include <linux/memblock.h>
21 #include <linux/sort.h>
23 #include <asm/mach-types.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/sizes.h>
28 #include <asm/fixmap.h>
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
35 static unsigned long phys_initrd_start __initdata
= 0;
36 static unsigned long phys_initrd_size __initdata
= 0;
38 static int __init
early_initrd(char *p
)
40 unsigned long start
, size
;
43 start
= memparse(p
, &endp
);
45 size
= memparse(endp
+ 1, NULL
);
47 phys_initrd_start
= start
;
48 phys_initrd_size
= size
;
52 early_param("initrd", early_initrd
);
54 static int __init
parse_tag_initrd(const struct tag
*tag
)
56 printk(KERN_WARNING
"ATAG_INITRD is deprecated; "
57 "please update your bootloader.\n");
58 phys_initrd_start
= __virt_to_phys(tag
->u
.initrd
.start
);
59 phys_initrd_size
= tag
->u
.initrd
.size
;
63 __tagtable(ATAG_INITRD
, parse_tag_initrd
);
65 static int __init
parse_tag_initrd2(const struct tag
*tag
)
67 phys_initrd_start
= tag
->u
.initrd
.start
;
68 phys_initrd_size
= tag
->u
.initrd
.size
;
72 __tagtable(ATAG_INITRD2
, parse_tag_initrd2
);
75 * This keeps memory configuration data used by a couple memory
76 * initialization functions, as well as show_mem() for the skipping
77 * of holes in the memory map. It is populated by arm_add_memory().
79 struct meminfo meminfo
;
83 int free
= 0, total
= 0, reserved
= 0;
84 int shared
= 0, cached
= 0, slab
= 0, i
;
85 struct meminfo
* mi
= &meminfo
;
87 printk("Mem-info:\n");
90 for_each_bank (i
, mi
) {
91 struct membank
*bank
= &mi
->bank
[i
];
92 unsigned int pfn1
, pfn2
;
93 struct page
*page
, *end
;
95 pfn1
= bank_pfn_start(bank
);
96 pfn2
= bank_pfn_end(bank
);
98 page
= pfn_to_page(pfn1
);
99 end
= pfn_to_page(pfn2
- 1) + 1;
103 if (PageReserved(page
))
105 else if (PageSwapCache(page
))
107 else if (PageSlab(page
))
109 else if (!page_count(page
))
112 shared
+= page_count(page
) - 1;
114 } while (page
< end
);
117 printk("%d pages of RAM\n", total
);
118 printk("%d free pages\n", free
);
119 printk("%d reserved pages\n", reserved
);
120 printk("%d slab pages\n", slab
);
121 printk("%d pages shared\n", shared
);
122 printk("%d pages swap cached\n", cached
);
125 static void __init
find_limits(struct meminfo
*mi
,
126 unsigned long *min
, unsigned long *max_low
, unsigned long *max_high
)
131 *max_low
= *max_high
= 0;
133 for_each_bank (i
, mi
) {
134 struct membank
*bank
= &mi
->bank
[i
];
135 unsigned long start
, end
;
137 start
= bank_pfn_start(bank
);
138 end
= bank_pfn_end(bank
);
151 static void __init
arm_bootmem_init(unsigned long start_pfn
,
152 unsigned long end_pfn
)
154 struct memblock_region
*reg
;
155 unsigned int boot_pages
;
160 * Allocate the bootmem bitmap page. This must be in a region
161 * of memory which has already been mapped.
163 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
164 bitmap
= memblock_alloc_base(boot_pages
<< PAGE_SHIFT
, L1_CACHE_BYTES
,
165 __pfn_to_phys(end_pfn
));
168 * Initialise the bootmem allocator, handing the
169 * memory banks over to bootmem.
172 pgdat
= NODE_DATA(0);
173 init_bootmem_node(pgdat
, __phys_to_pfn(bitmap
), start_pfn
, end_pfn
);
175 /* Free the lowmem regions from memblock into bootmem. */
176 for_each_memblock(memory
, reg
) {
177 unsigned long start
= memblock_region_memory_base_pfn(reg
);
178 unsigned long end
= memblock_region_memory_end_pfn(reg
);
185 free_bootmem(__pfn_to_phys(start
), (end
- start
) << PAGE_SHIFT
);
188 /* Reserve the lowmem memblock reserved regions in bootmem. */
189 for_each_memblock(reserved
, reg
) {
190 unsigned long start
= memblock_region_reserved_base_pfn(reg
);
191 unsigned long end
= memblock_region_reserved_end_pfn(reg
);
198 reserve_bootmem(__pfn_to_phys(start
),
199 (end
- start
) << PAGE_SHIFT
, BOOTMEM_DEFAULT
);
203 static void __init
arm_bootmem_free(unsigned long min
, unsigned long max_low
,
204 unsigned long max_high
)
206 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
207 struct memblock_region
*reg
;
210 * initialise the zones.
212 memset(zone_size
, 0, sizeof(zone_size
));
215 * The memory size has already been determined. If we need
216 * to do anything fancy with the allocation of this memory
217 * to the zones, now is the time to do it.
219 zone_size
[0] = max_low
- min
;
220 #ifdef CONFIG_HIGHMEM
221 zone_size
[ZONE_HIGHMEM
] = max_high
- max_low
;
225 * Calculate the size of the holes.
226 * holes = node_size - sum(bank_sizes)
228 memcpy(zhole_size
, zone_size
, sizeof(zhole_size
));
229 for_each_memblock(memory
, reg
) {
230 unsigned long start
= memblock_region_memory_base_pfn(reg
);
231 unsigned long end
= memblock_region_memory_end_pfn(reg
);
233 if (start
< max_low
) {
234 unsigned long low_end
= min(end
, max_low
);
235 zhole_size
[0] -= low_end
- start
;
237 #ifdef CONFIG_HIGHMEM
239 unsigned long high_start
= max(start
, max_low
);
240 zhole_size
[ZONE_HIGHMEM
] -= end
- high_start
;
246 * Adjust the sizes according to any special requirements for
249 arch_adjust_zones(zone_size
, zhole_size
);
251 free_area_init_node(0, zone_size
, min
, zhole_size
);
254 #ifndef CONFIG_SPARSEMEM
255 int pfn_valid(unsigned long pfn
)
257 return memblock_is_memory(pfn
<< PAGE_SHIFT
);
259 EXPORT_SYMBOL(pfn_valid
);
261 static void arm_memory_present(void)
265 static void arm_memory_present(void)
267 struct memblock_region
*reg
;
269 for_each_memblock(memory
, reg
)
270 memory_present(0, memblock_region_memory_base_pfn(reg
),
271 memblock_region_memory_end_pfn(reg
));
275 static int __init
meminfo_cmp(const void *_a
, const void *_b
)
277 const struct membank
*a
= _a
, *b
= _b
;
278 long cmp
= bank_pfn_start(a
) - bank_pfn_start(b
);
279 return cmp
< 0 ? -1 : cmp
> 0 ? 1 : 0;
282 void __init
arm_memblock_init(struct meminfo
*mi
, struct machine_desc
*mdesc
)
286 sort(&meminfo
.bank
, meminfo
.nr_banks
, sizeof(meminfo
.bank
[0]), meminfo_cmp
, NULL
);
289 for (i
= 0; i
< mi
->nr_banks
; i
++)
290 memblock_add(mi
->bank
[i
].start
, mi
->bank
[i
].size
);
292 /* Register the kernel text, kernel data and initrd with memblock. */
293 #ifdef CONFIG_XIP_KERNEL
294 memblock_reserve(__pa(_sdata
), _end
- _sdata
);
296 memblock_reserve(__pa(_stext
), _end
- _stext
);
298 #ifdef CONFIG_BLK_DEV_INITRD
299 if (phys_initrd_size
) {
300 memblock_reserve(phys_initrd_start
, phys_initrd_size
);
302 /* Now convert initrd to virtual addresses */
303 initrd_start
= __phys_to_virt(phys_initrd_start
);
304 initrd_end
= initrd_start
+ phys_initrd_size
;
308 arm_mm_memblock_reserve();
310 /* reserve any platform specific memblock areas */
318 void __init
bootmem_init(void)
320 struct meminfo
*mi
= &meminfo
;
321 unsigned long min
, max_low
, max_high
;
323 max_low
= max_high
= 0;
325 find_limits(mi
, &min
, &max_low
, &max_high
);
327 arm_bootmem_init(min
, max_low
);
330 * Sparsemem tries to allocate bootmem in memory_present(),
331 * so must be done after the fixed reservations
333 arm_memory_present();
336 * sparse_init() needs the bootmem allocator up and running.
341 * Now free the memory - free_area_init_node needs
342 * the sparse mem_map arrays initialized by sparse_init()
343 * for memmap_init_zone(), otherwise all PFNs are invalid.
345 arm_bootmem_free(min
, max_low
, max_high
);
347 high_memory
= __va((max_low
<< PAGE_SHIFT
) - 1) + 1;
350 * This doesn't seem to be used by the Linux memory manager any
351 * more, but is used by ll_rw_block. If we can get rid of it, we
352 * also get rid of some of the stuff above as well.
354 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
355 * the system, not the maximum PFN.
357 max_low_pfn
= max_low
- PHYS_PFN_OFFSET
;
358 max_pfn
= max_high
- PHYS_PFN_OFFSET
;
361 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
363 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
365 for (; pfn
< end
; pfn
++) {
366 struct page
*page
= pfn_to_page(pfn
);
367 ClearPageReserved(page
);
368 init_page_count(page
);
374 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
380 free_memmap(unsigned long start_pfn
, unsigned long end_pfn
)
382 struct page
*start_pg
, *end_pg
;
383 unsigned long pg
, pgend
;
386 * Convert start_pfn/end_pfn to a struct page pointer.
388 start_pg
= pfn_to_page(start_pfn
- 1) + 1;
389 end_pg
= pfn_to_page(end_pfn
);
392 * Convert to physical addresses, and
393 * round start upwards and end downwards.
395 pg
= PAGE_ALIGN(__pa(start_pg
));
396 pgend
= __pa(end_pg
) & PAGE_MASK
;
399 * If there are free pages between these,
400 * free the section of the memmap array.
403 free_bootmem(pg
, pgend
- pg
);
407 * The mem_map array can get very big. Free the unused area of the memory map.
409 static void __init
free_unused_memmap(struct meminfo
*mi
)
411 unsigned long bank_start
, prev_bank_end
= 0;
415 * This relies on each bank being in address order.
416 * The banks are sorted previously in bootmem_init().
418 for_each_bank(i
, mi
) {
419 struct membank
*bank
= &mi
->bank
[i
];
421 bank_start
= bank_pfn_start(bank
);
424 * If we had a previous bank, and there is a space
425 * between the current bank and the previous, free it.
427 if (prev_bank_end
&& prev_bank_end
< bank_start
)
428 free_memmap(prev_bank_end
, bank_start
);
431 * Align up here since the VM subsystem insists that the
432 * memmap entries are valid from the bank end aligned to
433 * MAX_ORDER_NR_PAGES.
435 prev_bank_end
= ALIGN(bank_pfn_end(bank
), MAX_ORDER_NR_PAGES
);
439 static void __init
free_highpages(void)
441 #ifdef CONFIG_HIGHMEM
444 /* set highmem page free */
445 for_each_bank (i
, &meminfo
) {
446 unsigned long start
= bank_pfn_start(&meminfo
.bank
[i
]);
447 unsigned long end
= bank_pfn_end(&meminfo
.bank
[i
]);
448 if (start
>= max_low_pfn
+ PHYS_PFN_OFFSET
)
449 totalhigh_pages
+= free_area(start
, end
, NULL
);
451 totalram_pages
+= totalhigh_pages
;
456 * mem_init() marks the free areas in the mem_map and tells us how much
457 * memory is free. This is done after various parts of the system have
458 * claimed their memory after the kernel image.
460 void __init
mem_init(void)
462 unsigned long reserved_pages
, free_pages
;
463 struct memblock_region
*reg
;
465 #ifdef CONFIG_HAVE_TCM
466 /* These pointers are filled in on TCM detection */
471 max_mapnr
= pfn_to_page(max_pfn
+ PHYS_PFN_OFFSET
) - mem_map
;
473 /* this will put all unused low memory onto the freelists */
474 free_unused_memmap(&meminfo
);
476 totalram_pages
+= free_all_bootmem();
479 /* now that our DMA memory is actually so designated, we can free it */
480 totalram_pages
+= free_area(PHYS_PFN_OFFSET
,
481 __phys_to_pfn(__pa(swapper_pg_dir
)), NULL
);
486 reserved_pages
= free_pages
= 0;
488 for_each_bank(i
, &meminfo
) {
489 struct membank
*bank
= &meminfo
.bank
[i
];
490 unsigned int pfn1
, pfn2
;
491 struct page
*page
, *end
;
493 pfn1
= bank_pfn_start(bank
);
494 pfn2
= bank_pfn_end(bank
);
496 page
= pfn_to_page(pfn1
);
497 end
= pfn_to_page(pfn2
- 1) + 1;
500 if (PageReserved(page
))
502 else if (!page_count(page
))
505 } while (page
< end
);
509 * Since our memory may not be contiguous, calculate the
510 * real number of pages we have in this system
512 printk(KERN_INFO
"Memory:");
514 for_each_memblock(memory
, reg
) {
515 unsigned long pages
= memblock_region_memory_end_pfn(reg
) -
516 memblock_region_memory_base_pfn(reg
);
517 num_physpages
+= pages
;
518 printk(" %ldMB", pages
>> (20 - PAGE_SHIFT
));
520 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
522 printk(KERN_NOTICE
"Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
523 nr_free_pages() << (PAGE_SHIFT
-10),
524 free_pages
<< (PAGE_SHIFT
-10),
525 reserved_pages
<< (PAGE_SHIFT
-10),
526 totalhigh_pages
<< (PAGE_SHIFT
-10));
528 #define MLK(b, t) b, t, ((t) - (b)) >> 10
529 #define MLM(b, t) b, t, ((t) - (b)) >> 20
530 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
532 printk(KERN_NOTICE
"Virtual kernel memory layout:\n"
533 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
534 #ifdef CONFIG_HAVE_TCM
535 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
536 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
538 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
540 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
542 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
543 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
544 #ifdef CONFIG_HIGHMEM
545 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
547 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
548 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
549 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
550 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
552 MLK(UL(CONFIG_VECTORS_BASE
), UL(CONFIG_VECTORS_BASE
) +
554 #ifdef CONFIG_HAVE_TCM
555 MLK(DTCM_OFFSET
, (unsigned long) dtcm_end
),
556 MLK(ITCM_OFFSET
, (unsigned long) itcm_end
),
558 MLK(FIXADDR_START
, FIXADDR_TOP
),
560 MLM(CONSISTENT_BASE
, CONSISTENT_END
),
562 MLM(VMALLOC_START
, VMALLOC_END
),
563 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
564 #ifdef CONFIG_HIGHMEM
565 MLM(PKMAP_BASE
, (PKMAP_BASE
) + (LAST_PKMAP
) *
568 MLM(MODULES_VADDR
, MODULES_END
),
570 MLK_ROUNDUP(__init_begin
, __init_end
),
571 MLK_ROUNDUP(_text
, _etext
),
572 MLK_ROUNDUP(_sdata
, _edata
));
579 * Check boundaries twice: Some fundamental inconsistencies can
580 * be detected at build time already.
583 BUILD_BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
584 BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
586 BUILD_BUG_ON(TASK_SIZE
> MODULES_VADDR
);
587 BUG_ON(TASK_SIZE
> MODULES_VADDR
);
590 #ifdef CONFIG_HIGHMEM
591 BUILD_BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
592 BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
595 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
596 extern int sysctl_overcommit_memory
;
598 * On a machine this small we won't get
599 * anywhere without overcommit, so turn
602 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
606 void free_initmem(void)
608 #ifdef CONFIG_HAVE_TCM
609 extern char __tcm_start
, __tcm_end
;
611 totalram_pages
+= free_area(__phys_to_pfn(__pa(&__tcm_start
)),
612 __phys_to_pfn(__pa(&__tcm_end
)),
616 if (!machine_is_integrator() && !machine_is_cintegrator())
617 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
618 __phys_to_pfn(__pa(__init_end
)),
622 #ifdef CONFIG_BLK_DEV_INITRD
624 static int keep_initrd
;
626 void free_initrd_mem(unsigned long start
, unsigned long end
)
629 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
630 __phys_to_pfn(__pa(end
)),
634 static int __init
keepinitrd_setup(char *__unused
)
640 __setup("keepinitrd", keepinitrd_setup
);