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>
21 #include <asm/mach-types.h>
22 #include <asm/sections.h>
23 #include <asm/setup.h>
24 #include <asm/sizes.h>
26 #include <asm/fixmap.h>
28 #include <asm/mach/arch.h>
29 #include <asm/mach/map.h>
33 static unsigned long phys_initrd_start __initdata
= 0;
34 static unsigned long phys_initrd_size __initdata
= 0;
36 static int __init
early_initrd(char *p
)
38 unsigned long start
, size
;
41 start
= memparse(p
, &endp
);
43 size
= memparse(endp
+ 1, NULL
);
45 phys_initrd_start
= start
;
46 phys_initrd_size
= size
;
50 early_param("initrd", early_initrd
);
52 static int __init
parse_tag_initrd(const struct tag
*tag
)
54 printk(KERN_WARNING
"ATAG_INITRD is deprecated; "
55 "please update your bootloader.\n");
56 phys_initrd_start
= __virt_to_phys(tag
->u
.initrd
.start
);
57 phys_initrd_size
= tag
->u
.initrd
.size
;
61 __tagtable(ATAG_INITRD
, parse_tag_initrd
);
63 static int __init
parse_tag_initrd2(const struct tag
*tag
)
65 phys_initrd_start
= tag
->u
.initrd
.start
;
66 phys_initrd_size
= tag
->u
.initrd
.size
;
70 __tagtable(ATAG_INITRD2
, parse_tag_initrd2
);
73 * This keeps memory configuration data used by a couple memory
74 * initialization functions, as well as show_mem() for the skipping
75 * of holes in the memory map. It is populated by arm_add_memory().
77 struct meminfo meminfo
;
81 int free
= 0, total
= 0, reserved
= 0;
82 int shared
= 0, cached
= 0, slab
= 0, i
;
83 struct meminfo
* mi
= &meminfo
;
85 printk("Mem-info:\n");
88 for_each_bank (i
, mi
) {
89 struct membank
*bank
= &mi
->bank
[i
];
90 unsigned int pfn1
, pfn2
;
91 struct page
*page
, *end
;
93 pfn1
= bank_pfn_start(bank
);
94 pfn2
= bank_pfn_end(bank
);
96 page
= pfn_to_page(pfn1
);
97 end
= pfn_to_page(pfn2
- 1) + 1;
101 if (PageReserved(page
))
103 else if (PageSwapCache(page
))
105 else if (PageSlab(page
))
107 else if (!page_count(page
))
110 shared
+= page_count(page
) - 1;
112 } while (page
< end
);
115 printk("%d pages of RAM\n", total
);
116 printk("%d free pages\n", free
);
117 printk("%d reserved pages\n", reserved
);
118 printk("%d slab pages\n", slab
);
119 printk("%d pages shared\n", shared
);
120 printk("%d pages swap cached\n", cached
);
123 static void __init
find_limits(struct meminfo
*mi
,
124 unsigned long *min
, unsigned long *max_low
, unsigned long *max_high
)
129 *max_low
= *max_high
= 0;
131 for_each_bank (i
, mi
) {
132 struct membank
*bank
= &mi
->bank
[i
];
133 unsigned long start
, end
;
135 start
= bank_pfn_start(bank
);
136 end
= bank_pfn_end(bank
);
150 * FIXME: We really want to avoid allocating the bootmap bitmap
151 * over the top of the initrd. Hopefully, this is located towards
152 * the start of a bank, so if we allocate the bootmap bitmap at
153 * the end, we won't clash.
155 static unsigned int __init
156 find_bootmap_pfn(struct meminfo
*mi
, unsigned int bootmap_pages
)
158 unsigned int start_pfn
, i
, bootmap_pfn
;
160 start_pfn
= PAGE_ALIGN(__pa(_end
)) >> PAGE_SHIFT
;
163 for_each_bank(i
, mi
) {
164 struct membank
*bank
= &mi
->bank
[i
];
165 unsigned int start
, end
;
167 start
= bank_pfn_start(bank
);
168 end
= bank_pfn_end(bank
);
173 if (start
< start_pfn
)
179 if (end
- start
>= bootmap_pages
) {
185 if (bootmap_pfn
== 0)
191 static int __init
check_initrd(struct meminfo
*mi
)
194 #ifdef CONFIG_BLK_DEV_INITRD
195 unsigned long end
= phys_initrd_start
+ phys_initrd_size
;
198 * Make sure that the initrd is within a valid area of
201 if (phys_initrd_size
) {
206 for (i
= 0; i
< mi
->nr_banks
; i
++) {
207 struct membank
*bank
= &mi
->bank
[i
];
208 if (bank_phys_start(bank
) <= phys_initrd_start
&&
209 end
<= bank_phys_end(bank
))
215 printk(KERN_ERR
"INITRD: 0x%08lx+0x%08lx extends beyond "
216 "physical memory - disabling initrd\n",
217 phys_initrd_start
, phys_initrd_size
);
218 phys_initrd_start
= phys_initrd_size
= 0;
225 static void __init
arm_bootmem_init(struct meminfo
*mi
,
226 unsigned long start_pfn
, unsigned long end_pfn
)
228 unsigned long boot_pfn
;
229 unsigned int boot_pages
;
234 * Allocate the bootmem bitmap page.
236 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
237 boot_pfn
= find_bootmap_pfn(mi
, boot_pages
);
240 * Initialise the bootmem allocator, handing the
241 * memory banks over to bootmem.
244 pgdat
= NODE_DATA(0);
245 init_bootmem_node(pgdat
, boot_pfn
, start_pfn
, end_pfn
);
247 for_each_bank(i
, mi
) {
248 struct membank
*bank
= &mi
->bank
[i
];
250 free_bootmem(bank_phys_start(bank
), bank_phys_size(bank
));
254 * Reserve the bootmem bitmap.
256 reserve_bootmem(boot_pfn
<< PAGE_SHIFT
,
257 boot_pages
<< PAGE_SHIFT
, BOOTMEM_DEFAULT
);
260 static void __init
bootmem_reserve_initrd(void)
262 #ifdef CONFIG_BLK_DEV_INITRD
265 res
= reserve_bootmem(phys_initrd_start
,
266 phys_initrd_size
, BOOTMEM_EXCLUSIVE
);
269 initrd_start
= __phys_to_virt(phys_initrd_start
);
270 initrd_end
= initrd_start
+ phys_initrd_size
;
273 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
274 "memory region - disabling initrd\n",
275 phys_initrd_start
, phys_initrd_size
);
280 static void __init
arm_bootmem_free(struct meminfo
*mi
)
282 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
283 unsigned long min
, max_low
, max_high
;
286 find_limits(mi
, &min
, &max_low
, &max_high
);
289 * initialise the zones.
291 memset(zone_size
, 0, sizeof(zone_size
));
294 * The memory size has already been determined. If we need
295 * to do anything fancy with the allocation of this memory
296 * to the zones, now is the time to do it.
298 zone_size
[0] = max_low
- min
;
299 #ifdef CONFIG_HIGHMEM
300 zone_size
[ZONE_HIGHMEM
] = max_high
- max_low
;
304 * Calculate the size of the holes.
305 * holes = node_size - sum(bank_sizes)
307 memcpy(zhole_size
, zone_size
, sizeof(zhole_size
));
308 for_each_bank(i
, mi
) {
310 #ifdef CONFIG_HIGHMEM
311 if (mi
->bank
[i
].highmem
)
314 zhole_size
[idx
] -= bank_pfn_size(&mi
->bank
[i
]);
318 * Adjust the sizes according to any special requirements for
321 arch_adjust_zones(zone_size
, zhole_size
);
323 free_area_init_node(0, zone_size
, min
, zhole_size
);
326 #ifndef CONFIG_SPARSEMEM
327 int pfn_valid(unsigned long pfn
)
329 struct meminfo
*mi
= &meminfo
;
330 unsigned int left
= 0, right
= mi
->nr_banks
;
333 unsigned int mid
= (right
+ left
) / 2;
334 struct membank
*bank
= &mi
->bank
[mid
];
336 if (pfn
< bank_pfn_start(bank
))
338 else if (pfn
>= bank_pfn_end(bank
))
342 } while (left
< right
);
345 EXPORT_SYMBOL(pfn_valid
);
347 static void arm_memory_present(struct meminfo
*mi
)
351 static void arm_memory_present(struct meminfo
*mi
)
354 for_each_bank(i
, mi
) {
355 struct membank
*bank
= &mi
->bank
[i
];
356 memory_present(0, bank_pfn_start(bank
), bank_pfn_end(bank
));
361 void __init
bootmem_init(struct machine_desc
*mdesc
)
363 struct meminfo
*mi
= &meminfo
;
364 unsigned long min
, max_low
, max_high
;
368 * Locate the ramdisk image, if any.
370 initrd
= check_initrd(mi
);
372 max_low
= max_high
= 0;
374 find_limits(mi
, &min
, &max_low
, &max_high
);
376 arm_bootmem_init(mi
, min
, max_low
);
379 * Reserve any special regions.
381 reserve_special_regions();
387 * If the initrd is present, reserve its memory.
390 bootmem_reserve_initrd();
393 * Sparsemem tries to allocate bootmem in memory_present(),
394 * so must be done after the fixed reservations
396 arm_memory_present(mi
);
399 * sparse_init() needs the bootmem allocator up and running.
404 * Now free the memory - free_area_init_node needs
405 * the sparse mem_map arrays initialized by sparse_init()
406 * for memmap_init_zone(), otherwise all PFNs are invalid.
408 arm_bootmem_free(mi
);
410 high_memory
= __va((max_low
<< PAGE_SHIFT
) - 1) + 1;
413 * This doesn't seem to be used by the Linux memory manager any
414 * more, but is used by ll_rw_block. If we can get rid of it, we
415 * also get rid of some of the stuff above as well.
417 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
418 * the system, not the maximum PFN.
420 max_low_pfn
= max_low
- PHYS_PFN_OFFSET
;
421 max_pfn
= max_high
- PHYS_PFN_OFFSET
;
424 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
426 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
428 for (; pfn
< end
; pfn
++) {
429 struct page
*page
= pfn_to_page(pfn
);
430 ClearPageReserved(page
);
431 init_page_count(page
);
437 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
443 free_memmap(unsigned long start_pfn
, unsigned long end_pfn
)
445 struct page
*start_pg
, *end_pg
;
446 unsigned long pg
, pgend
;
449 * Convert start_pfn/end_pfn to a struct page pointer.
451 start_pg
= pfn_to_page(start_pfn
- 1) + 1;
452 end_pg
= pfn_to_page(end_pfn
);
455 * Convert to physical addresses, and
456 * round start upwards and end downwards.
458 pg
= PAGE_ALIGN(__pa(start_pg
));
459 pgend
= __pa(end_pg
) & PAGE_MASK
;
462 * If there are free pages between these,
463 * free the section of the memmap array.
466 free_bootmem(pg
, pgend
- pg
);
470 * The mem_map array can get very big. Free the unused area of the memory map.
472 static void __init
free_unused_memmap(struct meminfo
*mi
)
474 unsigned long bank_start
, prev_bank_end
= 0;
478 * [FIXME] This relies on each bank being in address order. This
479 * may not be the case, especially if the user has provided the
480 * information on the command line.
482 for_each_bank(i
, mi
) {
483 struct membank
*bank
= &mi
->bank
[i
];
485 bank_start
= bank_pfn_start(bank
);
486 if (bank_start
< prev_bank_end
) {
487 printk(KERN_ERR
"MEM: unordered memory banks. "
488 "Not freeing memmap.\n");
493 * If we had a previous bank, and there is a space
494 * between the current bank and the previous, free it.
496 if (prev_bank_end
&& prev_bank_end
!= bank_start
)
497 free_memmap(prev_bank_end
, bank_start
);
499 prev_bank_end
= bank_pfn_end(bank
);
504 * mem_init() marks the free areas in the mem_map and tells us how much
505 * memory is free. This is done after various parts of the system have
506 * claimed their memory after the kernel image.
508 void __init
mem_init(void)
510 unsigned long reserved_pages
, free_pages
;
513 max_mapnr
= pfn_to_page(max_pfn
+ PHYS_PFN_OFFSET
) - mem_map
;
515 /* this will put all unused low memory onto the freelists */
516 free_unused_memmap(&meminfo
);
518 totalram_pages
+= free_all_bootmem();
521 /* now that our DMA memory is actually so designated, we can free it */
522 totalram_pages
+= free_area(PHYS_PFN_OFFSET
,
523 __phys_to_pfn(__pa(swapper_pg_dir
)), NULL
);
526 #ifdef CONFIG_HIGHMEM
527 /* set highmem page free */
528 for_each_bank (i
, &meminfo
) {
529 unsigned long start
= bank_pfn_start(&meminfo
.bank
[i
]);
530 unsigned long end
= bank_pfn_end(&meminfo
.bank
[i
]);
531 if (start
>= max_low_pfn
+ PHYS_PFN_OFFSET
)
532 totalhigh_pages
+= free_area(start
, end
, NULL
);
534 totalram_pages
+= totalhigh_pages
;
537 reserved_pages
= free_pages
= 0;
539 for_each_bank(i
, &meminfo
) {
540 struct membank
*bank
= &meminfo
.bank
[i
];
541 unsigned int pfn1
, pfn2
;
542 struct page
*page
, *end
;
544 pfn1
= bank_pfn_start(bank
);
545 pfn2
= bank_pfn_end(bank
);
547 page
= pfn_to_page(pfn1
);
548 end
= pfn_to_page(pfn2
- 1) + 1;
551 if (PageReserved(page
))
553 else if (!page_count(page
))
556 } while (page
< end
);
560 * Since our memory may not be contiguous, calculate the
561 * real number of pages we have in this system
563 printk(KERN_INFO
"Memory:");
565 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
566 num_physpages
+= bank_pfn_size(&meminfo
.bank
[i
]);
567 printk(" %ldMB", bank_phys_size(&meminfo
.bank
[i
]) >> 20);
569 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
571 printk(KERN_NOTICE
"Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
572 nr_free_pages() << (PAGE_SHIFT
-10),
573 free_pages
<< (PAGE_SHIFT
-10),
574 reserved_pages
<< (PAGE_SHIFT
-10),
575 totalhigh_pages
<< (PAGE_SHIFT
-10));
577 #define MLK(b, t) b, t, ((t) - (b)) >> 10
578 #define MLM(b, t) b, t, ((t) - (b)) >> 20
579 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
581 printk(KERN_NOTICE
"Virtual kernel memory layout:\n"
582 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
583 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
585 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
587 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
588 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
589 #ifdef CONFIG_HIGHMEM
590 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
592 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
593 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
594 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
595 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
597 MLK(UL(CONFIG_VECTORS_BASE
), UL(CONFIG_VECTORS_BASE
) +
599 MLK(FIXADDR_START
, FIXADDR_TOP
),
601 MLM(CONSISTENT_BASE
, CONSISTENT_END
),
603 MLM(VMALLOC_START
, VMALLOC_END
),
604 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
605 #ifdef CONFIG_HIGHMEM
606 MLM(PKMAP_BASE
, (PKMAP_BASE
) + (LAST_PKMAP
) *
609 MLM(MODULES_VADDR
, MODULES_END
),
611 MLK_ROUNDUP(__init_begin
, __init_end
),
612 MLK_ROUNDUP(_text
, _etext
),
613 MLK_ROUNDUP(_data
, _edata
));
620 * Check boundaries twice: Some fundamental inconsistencies can
621 * be detected at build time already.
624 BUILD_BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
625 BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
627 BUILD_BUG_ON(TASK_SIZE
> MODULES_VADDR
);
628 BUG_ON(TASK_SIZE
> MODULES_VADDR
);
631 #ifdef CONFIG_HIGHMEM
632 BUILD_BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
633 BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
636 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
637 extern int sysctl_overcommit_memory
;
639 * On a machine this small we won't get
640 * anywhere without overcommit, so turn
643 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
647 void free_initmem(void)
649 #ifdef CONFIG_HAVE_TCM
650 extern char __tcm_start
, __tcm_end
;
652 totalram_pages
+= free_area(__phys_to_pfn(__pa(&__tcm_start
)),
653 __phys_to_pfn(__pa(&__tcm_end
)),
657 if (!machine_is_integrator() && !machine_is_cintegrator())
658 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
659 __phys_to_pfn(__pa(__init_end
)),
663 #ifdef CONFIG_BLK_DEV_INITRD
665 static int keep_initrd
;
667 void free_initrd_mem(unsigned long start
, unsigned long end
)
670 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
671 __phys_to_pfn(__pa(end
)),
675 static int __init
keepinitrd_setup(char *__unused
)
681 __setup("keepinitrd", keepinitrd_setup
);