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_is_region_reserved(phys_initrd_start
, phys_initrd_size
)) {
287 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
288 phys_initrd_start
, phys_initrd_size
);
289 phys_initrd_start
= phys_initrd_size
= 0;
291 if (phys_initrd_size
) {
292 memblock_reserve(phys_initrd_start
, phys_initrd_size
);
294 /* Now convert initrd to virtual addresses */
295 initrd_start
= __phys_to_virt(phys_initrd_start
);
296 initrd_end
= initrd_start
+ phys_initrd_size
;
300 arm_mm_memblock_reserve();
302 /* reserve any platform specific memblock areas */
310 void __init
bootmem_init(void)
312 struct meminfo
*mi
= &meminfo
;
313 unsigned long min
, max_low
, max_high
;
315 max_low
= max_high
= 0;
317 find_limits(mi
, &min
, &max_low
, &max_high
);
319 arm_bootmem_init(mi
, min
, max_low
);
322 * Sparsemem tries to allocate bootmem in memory_present(),
323 * so must be done after the fixed reservations
325 arm_memory_present();
328 * sparse_init() needs the bootmem allocator up and running.
333 * Now free the memory - free_area_init_node needs
334 * the sparse mem_map arrays initialized by sparse_init()
335 * for memmap_init_zone(), otherwise all PFNs are invalid.
337 arm_bootmem_free(mi
, min
, max_low
, max_high
);
339 high_memory
= __va((max_low
<< PAGE_SHIFT
) - 1) + 1;
342 * This doesn't seem to be used by the Linux memory manager any
343 * more, but is used by ll_rw_block. If we can get rid of it, we
344 * also get rid of some of the stuff above as well.
346 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
347 * the system, not the maximum PFN.
349 max_low_pfn
= max_low
- PHYS_PFN_OFFSET
;
350 max_pfn
= max_high
- PHYS_PFN_OFFSET
;
353 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
355 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
357 for (; pfn
< end
; pfn
++) {
358 struct page
*page
= pfn_to_page(pfn
);
359 ClearPageReserved(page
);
360 init_page_count(page
);
366 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
372 free_memmap(unsigned long start_pfn
, unsigned long end_pfn
)
374 struct page
*start_pg
, *end_pg
;
375 unsigned long pg
, pgend
;
378 * Convert start_pfn/end_pfn to a struct page pointer.
380 start_pg
= pfn_to_page(start_pfn
- 1) + 1;
381 end_pg
= pfn_to_page(end_pfn
);
384 * Convert to physical addresses, and
385 * round start upwards and end downwards.
387 pg
= PAGE_ALIGN(__pa(start_pg
));
388 pgend
= __pa(end_pg
) & PAGE_MASK
;
391 * If there are free pages between these,
392 * free the section of the memmap array.
395 free_bootmem(pg
, pgend
- pg
);
399 * The mem_map array can get very big. Free the unused area of the memory map.
401 static void __init
free_unused_memmap(struct meminfo
*mi
)
403 unsigned long bank_start
, prev_bank_end
= 0;
407 * This relies on each bank being in address order.
408 * The banks are sorted previously in bootmem_init().
410 for_each_bank(i
, mi
) {
411 struct membank
*bank
= &mi
->bank
[i
];
413 bank_start
= bank_pfn_start(bank
);
416 * If we had a previous bank, and there is a space
417 * between the current bank and the previous, free it.
419 if (prev_bank_end
&& prev_bank_end
< bank_start
)
420 free_memmap(prev_bank_end
, bank_start
);
423 * Align up here since the VM subsystem insists that the
424 * memmap entries are valid from the bank end aligned to
425 * MAX_ORDER_NR_PAGES.
427 prev_bank_end
= ALIGN(bank_pfn_end(bank
), MAX_ORDER_NR_PAGES
);
432 * mem_init() marks the free areas in the mem_map and tells us how much
433 * memory is free. This is done after various parts of the system have
434 * claimed their memory after the kernel image.
436 void __init
mem_init(void)
438 unsigned long reserved_pages
, free_pages
;
440 #ifdef CONFIG_HAVE_TCM
441 /* These pointers are filled in on TCM detection */
446 max_mapnr
= pfn_to_page(max_pfn
+ PHYS_PFN_OFFSET
) - mem_map
;
448 /* this will put all unused low memory onto the freelists */
449 free_unused_memmap(&meminfo
);
451 totalram_pages
+= free_all_bootmem();
454 /* now that our DMA memory is actually so designated, we can free it */
455 totalram_pages
+= free_area(PHYS_PFN_OFFSET
,
456 __phys_to_pfn(__pa(swapper_pg_dir
)), NULL
);
459 #ifdef CONFIG_HIGHMEM
460 /* set highmem page free */
461 for_each_bank (i
, &meminfo
) {
462 unsigned long start
= bank_pfn_start(&meminfo
.bank
[i
]);
463 unsigned long end
= bank_pfn_end(&meminfo
.bank
[i
]);
464 if (start
>= max_low_pfn
+ PHYS_PFN_OFFSET
)
465 totalhigh_pages
+= free_area(start
, end
, NULL
);
467 totalram_pages
+= totalhigh_pages
;
470 reserved_pages
= free_pages
= 0;
472 for_each_bank(i
, &meminfo
) {
473 struct membank
*bank
= &meminfo
.bank
[i
];
474 unsigned int pfn1
, pfn2
;
475 struct page
*page
, *end
;
477 pfn1
= bank_pfn_start(bank
);
478 pfn2
= bank_pfn_end(bank
);
480 page
= pfn_to_page(pfn1
);
481 end
= pfn_to_page(pfn2
- 1) + 1;
484 if (PageReserved(page
))
486 else if (!page_count(page
))
489 } while (page
< end
);
493 * Since our memory may not be contiguous, calculate the
494 * real number of pages we have in this system
496 printk(KERN_INFO
"Memory:");
498 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
499 num_physpages
+= bank_pfn_size(&meminfo
.bank
[i
]);
500 printk(" %ldMB", bank_phys_size(&meminfo
.bank
[i
]) >> 20);
502 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
504 printk(KERN_NOTICE
"Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
505 nr_free_pages() << (PAGE_SHIFT
-10),
506 free_pages
<< (PAGE_SHIFT
-10),
507 reserved_pages
<< (PAGE_SHIFT
-10),
508 totalhigh_pages
<< (PAGE_SHIFT
-10));
510 #define MLK(b, t) b, t, ((t) - (b)) >> 10
511 #define MLM(b, t) b, t, ((t) - (b)) >> 20
512 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
514 printk(KERN_NOTICE
"Virtual kernel memory layout:\n"
515 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
516 #ifdef CONFIG_HAVE_TCM
517 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
518 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
520 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
522 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
524 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
525 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
526 #ifdef CONFIG_HIGHMEM
527 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
529 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
530 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
531 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
532 " .data : 0x%p" " - 0x%p" " (%4d kB)\n",
534 MLK(UL(CONFIG_VECTORS_BASE
), UL(CONFIG_VECTORS_BASE
) +
536 #ifdef CONFIG_HAVE_TCM
537 MLK(DTCM_OFFSET
, (unsigned long) dtcm_end
),
538 MLK(ITCM_OFFSET
, (unsigned long) itcm_end
),
540 MLK(FIXADDR_START
, FIXADDR_TOP
),
542 MLM(CONSISTENT_BASE
, CONSISTENT_END
),
544 MLM(VMALLOC_START
, VMALLOC_END
),
545 MLM(PAGE_OFFSET
, (unsigned long)high_memory
),
546 #ifdef CONFIG_HIGHMEM
547 MLM(PKMAP_BASE
, (PKMAP_BASE
) + (LAST_PKMAP
) *
550 MLM(MODULES_VADDR
, MODULES_END
),
552 MLK_ROUNDUP(__init_begin
, __init_end
),
553 MLK_ROUNDUP(_text
, _etext
),
554 MLK_ROUNDUP(_data
, _edata
));
561 * Check boundaries twice: Some fundamental inconsistencies can
562 * be detected at build time already.
565 BUILD_BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
566 BUG_ON(VMALLOC_END
> CONSISTENT_BASE
);
568 BUILD_BUG_ON(TASK_SIZE
> MODULES_VADDR
);
569 BUG_ON(TASK_SIZE
> MODULES_VADDR
);
572 #ifdef CONFIG_HIGHMEM
573 BUILD_BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
574 BUG_ON(PKMAP_BASE
+ LAST_PKMAP
* PAGE_SIZE
> PAGE_OFFSET
);
577 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
578 extern int sysctl_overcommit_memory
;
580 * On a machine this small we won't get
581 * anywhere without overcommit, so turn
584 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
588 void free_initmem(void)
590 #ifdef CONFIG_HAVE_TCM
591 extern char __tcm_start
, __tcm_end
;
593 totalram_pages
+= free_area(__phys_to_pfn(__pa(&__tcm_start
)),
594 __phys_to_pfn(__pa(&__tcm_end
)),
598 if (!machine_is_integrator() && !machine_is_cintegrator())
599 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
600 __phys_to_pfn(__pa(__init_end
)),
604 #ifdef CONFIG_BLK_DEV_INITRD
606 static int keep_initrd
;
608 void free_initrd_mem(unsigned long start
, unsigned long end
)
611 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
612 __phys_to_pfn(__pa(end
)),
616 static int __init
keepinitrd_setup(char *__unused
)
622 __setup("keepinitrd", keepinitrd_setup
);