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/sections.h>
21 #include <asm/setup.h>
22 #include <asm/sizes.h>
25 #include <asm/mach/arch.h>
26 #include <asm/mach/map.h>
30 static unsigned long phys_initrd_start __initdata
= 0;
31 static unsigned long phys_initrd_size __initdata
= 0;
33 static void __init
early_initrd(char **p
)
35 unsigned long start
, size
;
37 start
= memparse(*p
, p
);
39 size
= memparse((*p
) + 1, p
);
41 phys_initrd_start
= start
;
42 phys_initrd_size
= size
;
45 __early_param("initrd=", early_initrd
);
47 static int __init
parse_tag_initrd(const struct tag
*tag
)
49 printk(KERN_WARNING
"ATAG_INITRD is deprecated; "
50 "please update your bootloader.\n");
51 phys_initrd_start
= __virt_to_phys(tag
->u
.initrd
.start
);
52 phys_initrd_size
= tag
->u
.initrd
.size
;
56 __tagtable(ATAG_INITRD
, parse_tag_initrd
);
58 static int __init
parse_tag_initrd2(const struct tag
*tag
)
60 phys_initrd_start
= tag
->u
.initrd
.start
;
61 phys_initrd_size
= tag
->u
.initrd
.size
;
65 __tagtable(ATAG_INITRD2
, parse_tag_initrd2
);
68 * This keeps memory configuration data used by a couple memory
69 * initialization functions, as well as show_mem() for the skipping
70 * of holes in the memory map. It is populated by arm_add_memory().
72 struct meminfo meminfo
;
76 int free
= 0, total
= 0, reserved
= 0;
77 int shared
= 0, cached
= 0, slab
= 0, node
, i
;
78 struct meminfo
* mi
= &meminfo
;
80 printk("Mem-info:\n");
82 for_each_online_node(node
) {
83 pg_data_t
*n
= NODE_DATA(node
);
84 struct page
*map
= pgdat_page_nr(n
, 0) - n
->node_start_pfn
;
86 for_each_nodebank (i
,mi
,node
) {
87 struct membank
*bank
= &mi
->bank
[i
];
88 unsigned int pfn1
, pfn2
;
89 struct page
*page
, *end
;
91 pfn1
= bank_pfn_start(bank
);
92 pfn2
= bank_pfn_end(bank
);
99 if (PageReserved(page
))
101 else if (PageSwapCache(page
))
103 else if (PageSlab(page
))
105 else if (!page_count(page
))
108 shared
+= page_count(page
) - 1;
110 } while (page
< end
);
114 printk("%d pages of RAM\n", total
);
115 printk("%d free pages\n", free
);
116 printk("%d reserved pages\n", reserved
);
117 printk("%d slab pages\n", slab
);
118 printk("%d pages shared\n", shared
);
119 printk("%d pages swap cached\n", cached
);
123 * FIXME: We really want to avoid allocating the bootmap bitmap
124 * over the top of the initrd. Hopefully, this is located towards
125 * the start of a bank, so if we allocate the bootmap bitmap at
126 * the end, we won't clash.
128 static unsigned int __init
129 find_bootmap_pfn(int node
, struct meminfo
*mi
, unsigned int bootmap_pages
)
131 unsigned int start_pfn
, i
, bootmap_pfn
;
133 start_pfn
= PAGE_ALIGN(__pa(_end
)) >> PAGE_SHIFT
;
136 for_each_nodebank(i
, mi
, node
) {
137 struct membank
*bank
= &mi
->bank
[i
];
138 unsigned int start
, end
;
140 start
= bank_pfn_start(bank
);
141 end
= bank_pfn_end(bank
);
146 if (start
< start_pfn
)
152 if (end
- start
>= bootmap_pages
) {
158 if (bootmap_pfn
== 0)
164 static int __init
check_initrd(struct meminfo
*mi
)
166 int initrd_node
= -2;
167 #ifdef CONFIG_BLK_DEV_INITRD
168 unsigned long end
= phys_initrd_start
+ phys_initrd_size
;
171 * Make sure that the initrd is within a valid area of
174 if (phys_initrd_size
) {
179 for (i
= 0; i
< mi
->nr_banks
; i
++) {
180 struct membank
*bank
= &mi
->bank
[i
];
181 if (bank_phys_start(bank
) <= phys_initrd_start
&&
182 end
<= bank_phys_end(bank
))
183 initrd_node
= bank
->node
;
187 if (initrd_node
== -1) {
188 printk(KERN_ERR
"INITRD: 0x%08lx+0x%08lx extends beyond "
189 "physical memory - disabling initrd\n",
190 phys_initrd_start
, phys_initrd_size
);
191 phys_initrd_start
= phys_initrd_size
= 0;
198 static inline void map_memory_bank(struct membank
*bank
)
203 map
.pfn
= bank_pfn_start(bank
);
204 map
.virtual = __phys_to_virt(bank_phys_start(bank
));
205 map
.length
= bank_phys_size(bank
);
206 map
.type
= MT_MEMORY
;
208 create_mapping(&map
);
212 static unsigned long __init
bootmem_init_node(int node
, struct meminfo
*mi
)
214 unsigned long start_pfn
, end_pfn
, boot_pfn
;
215 unsigned int boot_pages
;
223 * Calculate the pfn range, and map the memory banks for this node.
225 for_each_nodebank(i
, mi
, node
) {
226 struct membank
*bank
= &mi
->bank
[i
];
227 unsigned long start
, end
;
229 start
= bank_pfn_start(bank
);
230 end
= bank_pfn_end(bank
);
232 if (start_pfn
> start
)
237 map_memory_bank(bank
);
241 * If there is no memory in this node, ignore it.
247 * Allocate the bootmem bitmap page.
249 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
250 boot_pfn
= find_bootmap_pfn(node
, mi
, boot_pages
);
253 * Initialise the bootmem allocator for this node, handing the
254 * memory banks over to bootmem.
256 node_set_online(node
);
257 pgdat
= NODE_DATA(node
);
258 init_bootmem_node(pgdat
, boot_pfn
, start_pfn
, end_pfn
);
260 for_each_nodebank(i
, mi
, node
) {
261 struct membank
*bank
= &mi
->bank
[i
];
262 free_bootmem_node(pgdat
, bank_phys_start(bank
), bank_phys_size(bank
));
263 memory_present(node
, bank_pfn_start(bank
), bank_pfn_end(bank
));
267 * Reserve the bootmem bitmap for this node.
269 reserve_bootmem_node(pgdat
, boot_pfn
<< PAGE_SHIFT
,
270 boot_pages
<< PAGE_SHIFT
, BOOTMEM_DEFAULT
);
275 static void __init
bootmem_reserve_initrd(int node
)
277 #ifdef CONFIG_BLK_DEV_INITRD
278 pg_data_t
*pgdat
= NODE_DATA(node
);
281 res
= reserve_bootmem_node(pgdat
, phys_initrd_start
,
282 phys_initrd_size
, BOOTMEM_EXCLUSIVE
);
285 initrd_start
= __phys_to_virt(phys_initrd_start
);
286 initrd_end
= initrd_start
+ phys_initrd_size
;
289 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
290 "memory region - disabling initrd\n",
291 phys_initrd_start
, phys_initrd_size
);
296 static void __init
bootmem_free_node(int node
, struct meminfo
*mi
)
298 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
299 unsigned long start_pfn
, end_pfn
;
300 pg_data_t
*pgdat
= NODE_DATA(node
);
303 start_pfn
= pgdat
->bdata
->node_min_pfn
;
304 end_pfn
= pgdat
->bdata
->node_low_pfn
;
307 * initialise the zones within this node.
309 memset(zone_size
, 0, sizeof(zone_size
));
310 memset(zhole_size
, 0, sizeof(zhole_size
));
313 * The size of this node has already been determined. If we need
314 * to do anything fancy with the allocation of this memory to the
315 * zones, now is the time to do it.
317 zone_size
[0] = end_pfn
- start_pfn
;
320 * For each bank in this node, calculate the size of the holes.
321 * holes = node_size - sum(bank_sizes_in_node)
323 zhole_size
[0] = zone_size
[0];
324 for_each_nodebank(i
, mi
, node
)
325 zhole_size
[0] -= bank_pfn_size(&mi
->bank
[i
]);
328 * Adjust the sizes according to any special requirements for
331 arch_adjust_zones(node
, zone_size
, zhole_size
);
333 free_area_init_node(node
, zone_size
, start_pfn
, zhole_size
);
336 void __init
bootmem_init(void)
338 struct meminfo
*mi
= &meminfo
;
339 unsigned long memend_pfn
= 0;
340 int node
, initrd_node
;
343 * Locate which node contains the ramdisk image, if any.
345 initrd_node
= check_initrd(mi
);
348 * Run through each node initialising the bootmem allocator.
350 for_each_node(node
) {
351 unsigned long end_pfn
= bootmem_init_node(node
, mi
);
354 * Reserve any special node zero regions.
357 reserve_node_zero(NODE_DATA(node
));
360 * If the initrd is in this node, reserve its memory.
362 if (node
== initrd_node
)
363 bootmem_reserve_initrd(node
);
366 * Remember the highest memory PFN.
368 if (end_pfn
> memend_pfn
)
369 memend_pfn
= end_pfn
;
373 * sparse_init() needs the bootmem allocator up and running.
378 * Now free memory in each node - free_area_init_node needs
379 * the sparse mem_map arrays initialized by sparse_init()
380 * for memmap_init_zone(), otherwise all PFNs are invalid.
383 bootmem_free_node(node
, mi
);
385 high_memory
= __va((memend_pfn
<< PAGE_SHIFT
) - 1) + 1;
388 * This doesn't seem to be used by the Linux memory manager any
389 * more, but is used by ll_rw_block. If we can get rid of it, we
390 * also get rid of some of the stuff above as well.
392 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
393 * the system, not the maximum PFN.
395 max_pfn
= max_low_pfn
= memend_pfn
- PHYS_PFN_OFFSET
;
398 static inline int free_area(unsigned long pfn
, unsigned long end
, char *s
)
400 unsigned int pages
= 0, size
= (end
- pfn
) << (PAGE_SHIFT
- 10);
402 for (; pfn
< end
; pfn
++) {
403 struct page
*page
= pfn_to_page(pfn
);
404 ClearPageReserved(page
);
405 init_page_count(page
);
411 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
417 free_memmap(int node
, unsigned long start_pfn
, unsigned long end_pfn
)
419 struct page
*start_pg
, *end_pg
;
420 unsigned long pg
, pgend
;
423 * Convert start_pfn/end_pfn to a struct page pointer.
425 start_pg
= pfn_to_page(start_pfn
);
426 end_pg
= pfn_to_page(end_pfn
);
429 * Convert to physical addresses, and
430 * round start upwards and end downwards.
432 pg
= PAGE_ALIGN(__pa(start_pg
));
433 pgend
= __pa(end_pg
) & PAGE_MASK
;
436 * If there are free pages between these,
437 * free the section of the memmap array.
440 free_bootmem_node(NODE_DATA(node
), pg
, pgend
- pg
);
444 * The mem_map array can get very big. Free the unused area of the memory map.
446 static void __init
free_unused_memmap_node(int node
, struct meminfo
*mi
)
448 unsigned long bank_start
, prev_bank_end
= 0;
452 * [FIXME] This relies on each bank being in address order. This
453 * may not be the case, especially if the user has provided the
454 * information on the command line.
456 for_each_nodebank(i
, mi
, node
) {
457 struct membank
*bank
= &mi
->bank
[i
];
459 bank_start
= bank_pfn_start(bank
);
460 if (bank_start
< prev_bank_end
) {
461 printk(KERN_ERR
"MEM: unordered memory banks. "
462 "Not freeing memmap.\n");
467 * If we had a previous bank, and there is a space
468 * between the current bank and the previous, free it.
470 if (prev_bank_end
&& prev_bank_end
!= bank_start
)
471 free_memmap(node
, prev_bank_end
, bank_start
);
473 prev_bank_end
= bank_pfn_end(bank
);
478 * mem_init() marks the free areas in the mem_map and tells us how much
479 * memory is free. This is done after various parts of the system have
480 * claimed their memory after the kernel image.
482 void __init
mem_init(void)
484 unsigned int codesize
, datasize
, initsize
;
487 #ifndef CONFIG_DISCONTIGMEM
488 max_mapnr
= virt_to_page(high_memory
) - mem_map
;
491 /* this will put all unused low memory onto the freelists */
492 for_each_online_node(node
) {
493 pg_data_t
*pgdat
= NODE_DATA(node
);
495 free_unused_memmap_node(node
, &meminfo
);
497 if (pgdat
->node_spanned_pages
!= 0)
498 totalram_pages
+= free_all_bootmem_node(pgdat
);
502 /* now that our DMA memory is actually so designated, we can free it */
503 totalram_pages
+= free_area(PHYS_PFN_OFFSET
,
504 __phys_to_pfn(__pa(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:");
513 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
514 num_physpages
+= bank_pfn_size(&meminfo
.bank
[i
]);
515 printk(" %ldMB", bank_phys_size(&meminfo
.bank
[i
]) >> 20);
517 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
519 codesize
= _etext
- _text
;
520 datasize
= _end
- _data
;
521 initsize
= __init_end
- __init_begin
;
523 printk(KERN_NOTICE
"Memory: %luKB available (%dK code, "
524 "%dK data, %dK init)\n",
525 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
526 codesize
>> 10, datasize
>> 10, initsize
>> 10);
528 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
529 extern int sysctl_overcommit_memory
;
531 * On a machine this small we won't get
532 * anywhere without overcommit, so turn
535 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
539 void free_initmem(void)
541 if (!machine_is_integrator() && !machine_is_cintegrator())
542 totalram_pages
+= free_area(__phys_to_pfn(__pa(__init_begin
)),
543 __phys_to_pfn(__pa(__init_end
)),
547 #ifdef CONFIG_BLK_DEV_INITRD
549 static int keep_initrd
;
551 void free_initrd_mem(unsigned long start
, unsigned long end
)
554 totalram_pages
+= free_area(__phys_to_pfn(__pa(start
)),
555 __phys_to_pfn(__pa(end
)),
559 static int __init
keepinitrd_setup(char *__unused
)
565 __setup("keepinitrd", keepinitrd_setup
);