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>
19 #include <asm/mach-types.h>
20 #include <asm/setup.h>
21 #include <asm/sizes.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach/map.h>
29 static unsigned long phys_initrd_start __initdata
= 0;
30 static unsigned long phys_initrd_size __initdata
= 0;
32 static void __init
early_initrd(char **p
)
34 unsigned long start
, size
;
36 start
= memparse(*p
, p
);
38 size
= memparse((*p
) + 1, p
);
40 phys_initrd_start
= start
;
41 phys_initrd_size
= size
;
44 __early_param("initrd=", early_initrd
);
46 static int __init
parse_tag_initrd(const struct tag
*tag
)
48 printk(KERN_WARNING
"ATAG_INITRD is deprecated; "
49 "please update your bootloader.\n");
50 phys_initrd_start
= __virt_to_phys(tag
->u
.initrd
.start
);
51 phys_initrd_size
= tag
->u
.initrd
.size
;
55 __tagtable(ATAG_INITRD
, parse_tag_initrd
);
57 static int __init
parse_tag_initrd2(const struct tag
*tag
)
59 phys_initrd_start
= tag
->u
.initrd
.start
;
60 phys_initrd_size
= tag
->u
.initrd
.size
;
64 __tagtable(ATAG_INITRD2
, parse_tag_initrd2
);
67 * This is used to pass memory configuration data from paging_init
68 * to mem_init, and by show_mem() to skip holes in the memory map.
70 static struct meminfo meminfo
= { 0, };
74 int free
= 0, total
= 0, reserved
= 0;
75 int shared
= 0, cached
= 0, slab
= 0, node
, i
;
76 struct meminfo
* mi
= &meminfo
;
78 printk("Mem-info:\n");
80 for_each_online_node(node
) {
81 pg_data_t
*n
= NODE_DATA(node
);
82 struct page
*map
= pgdat_page_nr(n
, 0) - n
->node_start_pfn
;
84 for_each_nodebank (i
,mi
,node
) {
85 struct membank
*bank
= &mi
->bank
[i
];
86 unsigned int pfn1
, pfn2
;
87 struct page
*page
, *end
;
89 pfn1
= bank_pfn_start(bank
);
90 pfn2
= bank_pfn_end(bank
);
97 if (PageReserved(page
))
99 else if (PageSwapCache(page
))
101 else if (PageSlab(page
))
103 else if (!page_count(page
))
106 shared
+= page_count(page
) - 1;
108 } while (page
< end
);
112 printk("%d pages of RAM\n", total
);
113 printk("%d free pages\n", free
);
114 printk("%d reserved pages\n", reserved
);
115 printk("%d slab pages\n", slab
);
116 printk("%d pages shared\n", shared
);
117 printk("%d pages swap cached\n", cached
);
121 * FIXME: We really want to avoid allocating the bootmap bitmap
122 * over the top of the initrd. Hopefully, this is located towards
123 * the start of a bank, so if we allocate the bootmap bitmap at
124 * the end, we won't clash.
126 static unsigned int __init
127 find_bootmap_pfn(int node
, struct meminfo
*mi
, unsigned int bootmap_pages
)
129 unsigned int start_pfn
, i
, bootmap_pfn
;
131 start_pfn
= PAGE_ALIGN(__pa(&_end
)) >> PAGE_SHIFT
;
134 for_each_nodebank(i
, mi
, node
) {
135 struct membank
*bank
= &mi
->bank
[i
];
136 unsigned int start
, end
;
138 start
= bank_pfn_start(bank
);
139 end
= bank_pfn_end(bank
);
144 if (start
< start_pfn
)
150 if (end
- start
>= bootmap_pages
) {
156 if (bootmap_pfn
== 0)
162 static int __init
check_initrd(struct meminfo
*mi
)
164 int initrd_node
= -2;
165 #ifdef CONFIG_BLK_DEV_INITRD
166 unsigned long end
= phys_initrd_start
+ phys_initrd_size
;
169 * Make sure that the initrd is within a valid area of
172 if (phys_initrd_size
) {
177 for (i
= 0; i
< mi
->nr_banks
; i
++) {
178 struct membank
*bank
= &mi
->bank
[i
];
179 if (bank_phys_start(bank
) <= phys_initrd_start
&&
180 end
<= bank_phys_end(bank
))
181 initrd_node
= bank
->node
;
185 if (initrd_node
== -1) {
186 printk(KERN_ERR
"INITRD: 0x%08lx+0x%08lx extends beyond "
187 "physical memory - disabling initrd\n",
188 phys_initrd_start
, phys_initrd_size
);
189 phys_initrd_start
= phys_initrd_size
= 0;
196 static inline void map_memory_bank(struct membank
*bank
)
201 map
.pfn
= bank_pfn_start(bank
);
202 map
.virtual = __phys_to_virt(bank_phys_start(bank
));
203 map
.length
= bank_phys_size(bank
);
204 map
.type
= MT_MEMORY
;
206 create_mapping(&map
);
210 static unsigned long __init
bootmem_init_node(int node
, struct meminfo
*mi
)
212 unsigned long start_pfn
, end_pfn
, boot_pfn
;
213 unsigned int boot_pages
;
221 * Calculate the pfn range, and map the memory banks for this node.
223 for_each_nodebank(i
, mi
, node
) {
224 struct membank
*bank
= &mi
->bank
[i
];
225 unsigned long start
, end
;
227 start
= bank_pfn_start(bank
);
228 end
= bank_pfn_end(bank
);
230 if (start_pfn
> start
)
235 map_memory_bank(bank
);
239 * If there is no memory in this node, ignore it.
245 * Allocate the bootmem bitmap page.
247 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
248 boot_pfn
= find_bootmap_pfn(node
, mi
, boot_pages
);
251 * Initialise the bootmem allocator for this node, handing the
252 * memory banks over to bootmem.
254 node_set_online(node
);
255 pgdat
= NODE_DATA(node
);
256 init_bootmem_node(pgdat
, boot_pfn
, start_pfn
, end_pfn
);
258 for_each_nodebank(i
, mi
, node
) {
259 struct membank
*bank
= &mi
->bank
[i
];
260 free_bootmem_node(pgdat
, bank_phys_start(bank
), bank_phys_size(bank
));
261 memory_present(node
, bank_pfn_start(bank
), bank_pfn_end(bank
));
265 * Reserve the bootmem bitmap for this node.
267 reserve_bootmem_node(pgdat
, boot_pfn
<< PAGE_SHIFT
,
268 boot_pages
<< PAGE_SHIFT
, BOOTMEM_DEFAULT
);
273 static void __init
bootmem_reserve_initrd(int node
)
275 #ifdef CONFIG_BLK_DEV_INITRD
276 pg_data_t
*pgdat
= NODE_DATA(node
);
279 res
= reserve_bootmem_node(pgdat
, phys_initrd_start
,
280 phys_initrd_size
, BOOTMEM_EXCLUSIVE
);
283 initrd_start
= __phys_to_virt(phys_initrd_start
);
284 initrd_end
= initrd_start
+ phys_initrd_size
;
287 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
288 "memory region - disabling initrd\n",
289 phys_initrd_start
, phys_initrd_size
);
294 static void __init
bootmem_free_node(int node
, struct meminfo
*mi
)
296 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
297 unsigned long start_pfn
, end_pfn
;
298 pg_data_t
*pgdat
= NODE_DATA(node
);
301 start_pfn
= pgdat
->bdata
->node_min_pfn
;
302 end_pfn
= pgdat
->bdata
->node_low_pfn
;
305 * initialise the zones within this node.
307 memset(zone_size
, 0, sizeof(zone_size
));
308 memset(zhole_size
, 0, sizeof(zhole_size
));
311 * The size of this node has already been determined. If we need
312 * to do anything fancy with the allocation of this memory to the
313 * zones, now is the time to do it.
315 zone_size
[0] = end_pfn
- start_pfn
;
318 * For each bank in this node, calculate the size of the holes.
319 * holes = node_size - sum(bank_sizes_in_node)
321 zhole_size
[0] = zone_size
[0];
322 for_each_nodebank(i
, mi
, node
)
323 zhole_size
[0] -= bank_pfn_size(&mi
->bank
[i
]);
326 * Adjust the sizes according to any special requirements for
329 arch_adjust_zones(node
, zone_size
, zhole_size
);
331 free_area_init_node(node
, zone_size
, start_pfn
, zhole_size
);
334 void __init
bootmem_init(struct meminfo
*mi
)
336 unsigned long memend_pfn
= 0;
337 int node
, initrd_node
;
339 memcpy(&meminfo
, mi
, sizeof(meminfo
));
342 * Locate which node contains the ramdisk image, if any.
344 initrd_node
= check_initrd(mi
);
347 * Run through each node initialising the bootmem allocator.
349 for_each_node(node
) {
350 unsigned long end_pfn
= bootmem_init_node(node
, mi
);
353 * Reserve any special node zero regions.
356 reserve_node_zero(NODE_DATA(node
));
359 * If the initrd is in this node, reserve its memory.
361 if (node
== initrd_node
)
362 bootmem_reserve_initrd(node
);
365 * Remember the highest memory PFN.
367 if (end_pfn
> memend_pfn
)
368 memend_pfn
= end_pfn
;
372 * sparse_init() needs the bootmem allocator up and running.
377 * Now free memory in each node - free_area_init_node needs
378 * the sparse mem_map arrays initialized by sparse_init()
379 * for memmap_init_zone(), otherwise all PFNs are invalid.
382 bootmem_free_node(node
, mi
);
384 high_memory
= __va(memend_pfn
<< PAGE_SHIFT
);
387 * This doesn't seem to be used by the Linux memory manager any
388 * more, but is used by ll_rw_block. If we can get rid of it, we
389 * also get rid of some of the stuff above as well.
391 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
392 * the system, not the maximum PFN.
394 max_pfn
= max_low_pfn
= memend_pfn
- PHYS_PFN_OFFSET
;
397 static inline void free_area(unsigned long addr
, unsigned long end
, char *s
)
399 unsigned int size
= (end
- addr
) >> 10;
401 for (; addr
< end
; addr
+= PAGE_SIZE
) {
402 struct page
*page
= virt_to_page(addr
);
403 ClearPageReserved(page
);
404 init_page_count(page
);
410 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
414 free_memmap(int node
, unsigned long start_pfn
, unsigned long end_pfn
)
416 struct page
*start_pg
, *end_pg
;
417 unsigned long pg
, pgend
;
420 * Convert start_pfn/end_pfn to a struct page pointer.
422 start_pg
= pfn_to_page(start_pfn
);
423 end_pg
= pfn_to_page(end_pfn
);
426 * Convert to physical addresses, and
427 * round start upwards and end downwards.
429 pg
= PAGE_ALIGN(__pa(start_pg
));
430 pgend
= __pa(end_pg
) & PAGE_MASK
;
433 * If there are free pages between these,
434 * free the section of the memmap array.
437 free_bootmem_node(NODE_DATA(node
), pg
, pgend
- pg
);
441 * The mem_map array can get very big. Free the unused area of the memory map.
443 static void __init
free_unused_memmap_node(int node
, struct meminfo
*mi
)
445 unsigned long bank_start
, prev_bank_end
= 0;
449 * [FIXME] This relies on each bank being in address order. This
450 * may not be the case, especially if the user has provided the
451 * information on the command line.
453 for_each_nodebank(i
, mi
, node
) {
454 struct membank
*bank
= &mi
->bank
[i
];
456 bank_start
= bank_pfn_start(bank
);
457 if (bank_start
< prev_bank_end
) {
458 printk(KERN_ERR
"MEM: unordered memory banks. "
459 "Not freeing memmap.\n");
464 * If we had a previous bank, and there is a space
465 * between the current bank and the previous, free it.
467 if (prev_bank_end
&& prev_bank_end
!= bank_start
)
468 free_memmap(node
, prev_bank_end
, bank_start
);
470 prev_bank_end
= bank_pfn_end(bank
);
475 * mem_init() marks the free areas in the mem_map and tells us how much
476 * memory is free. This is done after various parts of the system have
477 * claimed their memory after the kernel image.
479 void __init
mem_init(void)
481 unsigned int codepages
, datapages
, initpages
;
484 codepages
= &_etext
- &_text
;
485 datapages
= &_end
- &__data_start
;
486 initpages
= &__init_end
- &__init_begin
;
488 #ifndef CONFIG_DISCONTIGMEM
489 max_mapnr
= virt_to_page(high_memory
) - mem_map
;
492 /* this will put all unused low memory onto the freelists */
493 for_each_online_node(node
) {
494 pg_data_t
*pgdat
= NODE_DATA(node
);
496 free_unused_memmap_node(node
, &meminfo
);
498 if (pgdat
->node_spanned_pages
!= 0)
499 totalram_pages
+= free_all_bootmem_node(pgdat
);
503 /* now that our DMA memory is actually so designated, we can free it */
504 free_area(PAGE_OFFSET
, (unsigned long)swapper_pg_dir
, NULL
);
508 * Since our memory may not be contiguous, calculate the
509 * real number of pages we have in this system
511 printk(KERN_INFO
"Memory:");
514 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
515 num_physpages
+= bank_pfn_size(&meminfo
.bank
[i
]);
516 printk(" %ldMB", bank_phys_size(&meminfo
.bank
[i
]) >> 20);
519 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
520 printk(KERN_NOTICE
"Memory: %luKB available (%dK code, "
521 "%dK data, %dK init)\n",
522 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
523 codepages
>> 10, datapages
>> 10, initpages
>> 10);
525 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
526 extern int sysctl_overcommit_memory
;
528 * On a machine this small we won't get
529 * anywhere without overcommit, so turn
532 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
536 void free_initmem(void)
538 if (!machine_is_integrator() && !machine_is_cintegrator()) {
539 free_area((unsigned long)(&__init_begin
),
540 (unsigned long)(&__init_end
),
545 #ifdef CONFIG_BLK_DEV_INITRD
547 static int keep_initrd
;
549 void free_initrd_mem(unsigned long start
, unsigned long end
)
552 free_area(start
, end
, "initrd");
555 static int __init
keepinitrd_setup(char *__unused
)
561 __setup("keepinitrd", keepinitrd_setup
);