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>
22 #include <asm/mach-types.h>
23 #include <asm/sections.h>
24 #include <asm/setup.h>
25 #include <asm/sizes.h>
27 #include <asm/fixmap.h>
29 #include <asm/mach/arch.h>
30 #include <asm/mach/map.h>
34 static unsigned long phys_initrd_start __initdata
= 0;
35 static unsigned long phys_initrd_size __initdata
= 0;
37 static int __init
early_initrd(char *p
)
39 unsigned long start
, size
;
42 start
= memparse(p
, &endp
);
44 size
= memparse(endp
+ 1, NULL
);
46 phys_initrd_start
= start
;
47 phys_initrd_size
= size
;
51 early_param("initrd", early_initrd
);
53 static int __init
parse_tag_initrd(const struct tag
*tag
)
55 printk(KERN_WARNING
"ATAG_INITRD is deprecated; "
56 "please update your bootloader.\n");
57 phys_initrd_start
= __virt_to_phys(tag
->u
.initrd
.start
);
58 phys_initrd_size
= tag
->u
.initrd
.size
;
62 __tagtable(ATAG_INITRD
, parse_tag_initrd
);
64 static int __init
parse_tag_initrd2(const struct tag
*tag
)
66 phys_initrd_start
= tag
->u
.initrd
.start
;
67 phys_initrd_size
= tag
->u
.initrd
.size
;
71 __tagtable(ATAG_INITRD2
, parse_tag_initrd2
);
74 * This keeps memory configuration data used by a couple memory
75 * initialization functions, as well as show_mem() for the skipping
76 * of holes in the memory map. It is populated by arm_add_memory().
78 struct meminfo meminfo
;
82 int free
= 0, total
= 0, reserved
= 0;
83 int shared
= 0, cached
= 0, slab
= 0, i
;
84 struct meminfo
* mi
= &meminfo
;
86 printk("Mem-info:\n");
89 for_each_bank (i
, mi
) {
90 struct membank
*bank
= &mi
->bank
[i
];
91 unsigned int pfn1
, pfn2
;
92 struct page
*page
, *end
;
94 pfn1
= bank_pfn_start(bank
);
95 pfn2
= bank_pfn_end(bank
);
97 page
= pfn_to_page(pfn1
);
98 end
= pfn_to_page(pfn2
- 1) + 1;
102 if (PageReserved(page
))
104 else if (PageSwapCache(page
))
106 else if (PageSlab(page
))
108 else if (!page_count(page
))
111 shared
+= page_count(page
) - 1;
113 } while (page
< end
);
116 printk("%d pages of RAM\n", total
);
117 printk("%d free pages\n", free
);
118 printk("%d reserved pages\n", reserved
);
119 printk("%d slab pages\n", slab
);
120 printk("%d pages shared\n", shared
);
121 printk("%d pages swap cached\n", cached
);
124 static void __init
find_limits(struct meminfo
*mi
,
125 unsigned long *min
, unsigned long *max_low
, unsigned long *max_high
)
130 *max_low
= *max_high
= 0;
132 for_each_bank (i
, mi
) {
133 struct membank
*bank
= &mi
->bank
[i
];
134 unsigned long start
, end
;
136 start
= bank_pfn_start(bank
);
137 end
= bank_pfn_end(bank
);
150 static void __init
arm_bootmem_init(struct meminfo
*mi
,
151 unsigned long start_pfn
, unsigned long end_pfn
)
153 unsigned int boot_pages
;
159 * Allocate the bootmem bitmap page. This must be in a region
160 * of memory which has already been mapped.
162 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
163 bitmap
= memblock_alloc_base(boot_pages
<< PAGE_SHIFT
, L1_CACHE_BYTES
,
164 __pfn_to_phys(end_pfn
));
167 * Initialise the bootmem allocator, handing the
168 * memory banks over to bootmem.
171 pgdat
= NODE_DATA(0);
172 init_bootmem_node(pgdat
, __phys_to_pfn(bitmap
), start_pfn
, end_pfn
);
174 for_each_bank(i
, mi
) {
175 struct membank
*bank
= &mi
->bank
[i
];
177 free_bootmem(bank_phys_start(bank
), bank_phys_size(bank
));
181 * Reserve the memblock reserved regions in bootmem.
183 for (i
= 0; i
< memblock
.reserved
.cnt
; i
++) {
184 phys_addr_t start
= memblock_start_pfn(&memblock
.reserved
, i
);
185 if (start
>= start_pfn
&&
186 memblock_end_pfn(&memblock
.reserved
, i
) <= end_pfn
)
187 reserve_bootmem_node(pgdat
, __pfn_to_phys(start
),
188 memblock_size_bytes(&memblock
.reserved
, i
),
193 static void __init
arm_bootmem_free(struct meminfo
*mi
, unsigned long min
,
194 unsigned long max_low
, unsigned long max_high
)
196 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
200 * initialise the zones.
202 memset(zone_size
, 0, sizeof(zone_size
));
205 * The memory size has already been determined. If we need
206 * to do anything fancy with the allocation of this memory
207 * to the zones, now is the time to do it.
209 zone_size
[0] = max_low
- min
;
210 #ifdef CONFIG_HIGHMEM
211 zone_size
[ZONE_HIGHMEM
] = max_high
- max_low
;
215 * Calculate the size of the holes.
216 * holes = node_size - sum(bank_sizes)
218 memcpy(zhole_size
, zone_size
, sizeof(zhole_size
));
219 for_each_bank(i
, mi
) {
221 #ifdef CONFIG_HIGHMEM
222 if (mi
->bank
[i
].highmem
)
225 zhole_size
[idx
] -= bank_pfn_size(&mi
->bank
[i
]);
229 * Adjust the sizes according to any special requirements for
232 arch_adjust_zones(zone_size
, zhole_size
);
234 free_area_init_node(0, zone_size
, min
, zhole_size
);
237 #ifndef CONFIG_SPARSEMEM
238 int pfn_valid(unsigned long pfn
)
240 struct memblock_region
*mem
= &memblock
.memory
;
241 unsigned int left
= 0, right
= mem
->cnt
;
244 unsigned int mid
= (right
+ left
) / 2;
246 if (pfn
< memblock_start_pfn(mem
, mid
))
248 else if (pfn
>= memblock_end_pfn(mem
, mid
))
252 } while (left
< right
);
255 EXPORT_SYMBOL(pfn_valid
);
257 static void arm_memory_present(void)
261 static void arm_memory_present(void)
264 for (i
= 0; i
< memblock
.memory
.cnt
; i
++)
265 memory_present(0, memblock_start_pfn(&memblock
.memory
, i
),
266 memblock_end_pfn(&memblock
.memory
, i
));
270 void __init
arm_memblock_init(struct meminfo
*mi
, struct machine_desc
*mdesc
)
275 for (i
= 0; i
< mi
->nr_banks
; i
++)
276 memblock_add(mi
->bank
[i
].start
, mi
->bank
[i
].size
);
278 /* Register the kernel text, kernel data and initrd with memblock. */
279 #ifdef CONFIG_XIP_KERNEL
280 memblock_reserve(__pa(_data
), _end
- _data
);
282 memblock_reserve(__pa(_stext
), _end
- _stext
);
284 #ifdef CONFIG_BLK_DEV_INITRD
285 if (phys_initrd_size
) {
286 memblock_reserve(phys_initrd_start
, phys_initrd_size
);
288 /* Now convert initrd to virtual addresses */
289 initrd_start
= __phys_to_virt(phys_initrd_start
);
290 initrd_end
= initrd_start
+ phys_initrd_size
;
294 arm_mm_memblock_reserve();
296 /* reserve any platform specific memblock areas */
304 void __init
bootmem_init(void)
306 struct meminfo
*mi
= &meminfo
;
307 unsigned long min
, max_low
, max_high
;
309 max_low
= max_high
= 0;
311 find_limits(mi
, &min
, &max_low
, &max_high
);
313 arm_bootmem_init(mi
, min
, max_low
);
316 * Sparsemem tries to allocate bootmem in memory_present(),
317 * so must be done after the fixed reservations
319 arm_memory_present();
322 * sparse_init() needs the bootmem allocator up and running.
327 * Now free the memory - free_area_init_node needs
328 * the sparse mem_map arrays initialized by sparse_init()
329 * for memmap_init_zone(), otherwise all PFNs are invalid.
331 arm_bootmem_free(mi
, min
, max_low
, max_high
);
333 high_memory
= __va((max_low
<< PAGE_SHIFT
) - 1) + 1;
336 * This doesn't seem to be used by the Linux memory manager any
337 * more, but is used by ll_rw_block. If we can get rid of it, we
338 * also get rid of some of the stuff above as well.
340 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
341 * the system, not the maximum PFN.
343 max_low_pfn
= max_low
- PHYS_PFN_OFFSET
;
344 max_pfn
= max_high
- PHYS_PFN_OFFSET
;
347 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
349 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
351 for (; pfn
< end
; pfn
++) {
352 struct page
*page
= pfn_to_page(pfn
);
353 ClearPageReserved(page
);
354 init_page_count(page
);
360 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
366 free_memmap(unsigned long start_pfn
, unsigned long end_pfn
)
368 struct page
*start_pg
, *end_pg
;
369 unsigned long pg
, pgend
;
372 * Convert start_pfn/end_pfn to a struct page pointer.
374 start_pg
= pfn_to_page(start_pfn
- 1) + 1;
375 end_pg
= pfn_to_page(end_pfn
);
378 * Convert to physical addresses, and
379 * round start upwards and end downwards.
381 pg
= PAGE_ALIGN(__pa(start_pg
));
382 pgend
= __pa(end_pg
) & PAGE_MASK
;
385 * If there are free pages between these,
386 * free the section of the memmap array.
389 free_bootmem(pg
, pgend
- pg
);
393 * The mem_map array can get very big. Free the unused area of the memory map.
395 static void __init
free_unused_memmap(struct meminfo
*mi
)
397 unsigned long bank_start
, prev_bank_end
= 0;
401 * This relies on each bank being in address order.
402 * The banks are sorted previously in bootmem_init().
404 for_each_bank(i
, mi
) {
405 struct membank
*bank
= &mi
->bank
[i
];
407 bank_start
= bank_pfn_start(bank
);
410 * If we had a previous bank, and there is a space
411 * between the current bank and the previous, free it.
413 if (prev_bank_end
&& prev_bank_end
< bank_start
)
414 free_memmap(prev_bank_end
, bank_start
);
417 * Align up here since the VM subsystem insists that the
418 * memmap entries are valid from the bank end aligned to
419 * MAX_ORDER_NR_PAGES.
421 prev_bank_end
= ALIGN(bank_pfn_end(bank
), MAX_ORDER_NR_PAGES
);
426 * mem_init() marks the free areas in the mem_map and tells us how much
427 * memory is free. This is done after various parts of the system have
428 * claimed their memory after the kernel image.
430 void __init
mem_init(void)
432 unsigned long reserved_pages
, free_pages
;
434 #ifdef CONFIG_HAVE_TCM
435 /* These pointers are filled in on TCM detection */
440 max_mapnr
= pfn_to_page(max_pfn
+ PHYS_PFN_OFFSET
) - mem_map
;
442 /* this will put all unused low memory onto the freelists */
443 free_unused_memmap(&meminfo
);
445 totalram_pages
+= free_all_bootmem();
448 /* now that our DMA memory is actually so designated, we can free it */
449 totalram_pages
+= free_area(PHYS_PFN_OFFSET
,
450 __phys_to_pfn(__pa(swapper_pg_dir
)), NULL
);
453 #ifdef CONFIG_HIGHMEM
454 /* set highmem page free */
455 for_each_bank (i
, &meminfo
) {
456 unsigned long start
= bank_pfn_start(&meminfo
.bank
[i
]);
457 unsigned long end
= bank_pfn_end(&meminfo
.bank
[i
]);
458 if (start
>= max_low_pfn
+ PHYS_PFN_OFFSET
)
459 totalhigh_pages
+= free_area(start
, end
, NULL
);
461 totalram_pages
+= totalhigh_pages
;
464 reserved_pages
= free_pages
= 0;
466 for_each_bank(i
, &meminfo
) {
467 struct membank
*bank
= &meminfo
.bank
[i
];
468 unsigned int pfn1
, pfn2
;
469 struct page
*page
, *end
;
471 pfn1
= bank_pfn_start(bank
);
472 pfn2
= bank_pfn_end(bank
);
474 page
= pfn_to_page(pfn1
);
475 end
= pfn_to_page(pfn2
- 1) + 1;
478 if (PageReserved(page
))
480 else if (!page_count(page
))
483 } while (page
< end
);
487 * Since our memory may not be contiguous, calculate the
488 * real number of pages we have in this system
490 printk(KERN_INFO
"Memory:");
492 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
493 num_physpages
+= bank_pfn_size(&meminfo
.bank
[i
]);
494 printk(" %ldMB", bank_phys_size(&meminfo
.bank
[i
]) >> 20);
496 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
498 printk(KERN_NOTICE
"Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
499 nr_free_pages() << (PAGE_SHIFT
-10),
500 free_pages
<< (PAGE_SHIFT
-10),
501 reserved_pages
<< (PAGE_SHIFT
-10),
502 totalhigh_pages
<< (PAGE_SHIFT
-10));
504 #define MLK(b, t) b, t, ((t) - (b)) >> 10
505 #define MLM(b, t) b, t, ((t) - (b)) >> 20
506 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
508 printk(KERN_NOTICE
"Virtual kernel memory layout:\n"
509 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
510 #ifdef CONFIG_HAVE_TCM
511 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
512 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
514 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
516 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
518 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
519 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
520 #ifdef CONFIG_HIGHMEM
521 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
523 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
524 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
525 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
526 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
528 MLK(UL(CONFIG_VECTORS_BASE
), UL(CONFIG_VECTORS_BASE
) +
530 #ifdef CONFIG_HAVE_TCM
531 MLK(DTCM_OFFSET
, (unsigned long) dtcm_end
),
532 MLK(ITCM_OFFSET
, (unsigned long) itcm_end
),
534 MLK(FIXADDR_START
, FIXADDR_TOP
),
536 MLM(CONSISTENT_BASE
, CONSISTENT_END
),
538 MLM(VMALLOC_START
, VMALLOC_END
),
539 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
540 #ifdef CONFIG_HIGHMEM
541 MLM(PKMAP_BASE
, (PKMAP_BASE
) + (LAST_PKMAP
) *
544 MLM(MODULES_VADDR
, MODULES_END
),
546 MLK_ROUNDUP(__init_begin
, __init_end
),
547 MLK_ROUNDUP(_text
, _etext
),
548 MLK_ROUNDUP(_data
, _edata
));
555 * Check boundaries twice: Some fundamental inconsistencies can
556 * be detected at build time already.
559 BUILD_BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
560 BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
562 BUILD_BUG_ON(TASK_SIZE
> MODULES_VADDR
);
563 BUG_ON(TASK_SIZE
> MODULES_VADDR
);
566 #ifdef CONFIG_HIGHMEM
567 BUILD_BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
568 BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
571 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
572 extern int sysctl_overcommit_memory
;
574 * On a machine this small we won't get
575 * anywhere without overcommit, so turn
578 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
582 void free_initmem(void)
584 #ifdef CONFIG_HAVE_TCM
585 extern char __tcm_start
, __tcm_end
;
587 totalram_pages
+= free_area(__phys_to_pfn(__pa(&__tcm_start
)),
588 __phys_to_pfn(__pa(&__tcm_end
)),
592 if (!machine_is_integrator() && !machine_is_cintegrator())
593 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
594 __phys_to_pfn(__pa(__init_end
)),
598 #ifdef CONFIG_BLK_DEV_INITRD
600 static int keep_initrd
;
602 void free_initrd_mem(unsigned long start
, unsigned long end
)
605 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
606 __phys_to_pfn(__pa(end
)),
610 static int __init
keepinitrd_setup(char *__unused
)
616 __setup("keepinitrd", keepinitrd_setup
);