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/ptrace.h>
13 #include <linux/swap.h>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/mman.h>
17 #include <linux/nodemask.h>
18 #include <linux/initrd.h>
20 #include <asm/mach-types.h>
21 #include <asm/setup.h>
22 #include <asm/sizes.h>
25 #include <asm/mach/arch.h>
26 #include <asm/mach/map.h>
30 extern void _text
, _etext
, __data_start
, _end
, __init_begin
, __init_end
;
31 extern unsigned long phys_initrd_start
;
32 extern unsigned long phys_initrd_size
;
35 * The sole use of this is to pass memory configuration
36 * data from paging_init to mem_init.
38 static struct meminfo meminfo __initdata
= { 0, };
42 int free
= 0, total
= 0, reserved
= 0;
43 int shared
= 0, cached
= 0, slab
= 0, node
;
45 printk("Mem-info:\n");
47 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
49 for_each_online_node(node
) {
50 struct page
*page
, *end
;
52 page
= NODE_MEM_MAP(node
);
53 end
= page
+ NODE_DATA(node
)->node_spanned_pages
;
57 if (PageReserved(page
))
59 else if (PageSwapCache(page
))
61 else if (PageSlab(page
))
63 else if (!page_count(page
))
66 shared
+= page_count(page
) - 1;
71 printk("%d pages of RAM\n", total
);
72 printk("%d free pages\n", free
);
73 printk("%d reserved pages\n", reserved
);
74 printk("%d slab pages\n", slab
);
75 printk("%d pages shared\n", shared
);
76 printk("%d pages swap cached\n", cached
);
79 #define for_each_nodebank(iter,mi,no) \
80 for (iter = 0; iter < mi->nr_banks; iter++) \
81 if (mi->bank[iter].node == no)
84 * FIXME: We really want to avoid allocating the bootmap bitmap
85 * over the top of the initrd. Hopefully, this is located towards
86 * the start of a bank, so if we allocate the bootmap bitmap at
87 * the end, we won't clash.
89 static unsigned int __init
90 find_bootmap_pfn(int node
, struct meminfo
*mi
, unsigned int bootmap_pages
)
92 unsigned int start_pfn
, bank
, bootmap_pfn
;
94 start_pfn
= PAGE_ALIGN(__pa(&_end
)) >> PAGE_SHIFT
;
97 for_each_nodebank(bank
, mi
, node
) {
98 unsigned int start
, end
;
100 start
= mi
->bank
[bank
].start
>> PAGE_SHIFT
;
101 end
= (mi
->bank
[bank
].size
+
102 mi
->bank
[bank
].start
) >> PAGE_SHIFT
;
107 if (start
< start_pfn
)
113 if (end
- start
>= bootmap_pages
) {
119 if (bootmap_pfn
== 0)
125 static int __init
check_initrd(struct meminfo
*mi
)
127 int initrd_node
= -2;
128 #ifdef CONFIG_BLK_DEV_INITRD
129 unsigned long end
= phys_initrd_start
+ phys_initrd_size
;
132 * Make sure that the initrd is within a valid area of
135 if (phys_initrd_size
) {
140 for (i
= 0; i
< mi
->nr_banks
; i
++) {
141 unsigned long bank_end
;
143 bank_end
= mi
->bank
[i
].start
+ mi
->bank
[i
].size
;
145 if (mi
->bank
[i
].start
<= phys_initrd_start
&&
147 initrd_node
= mi
->bank
[i
].node
;
151 if (initrd_node
== -1) {
152 printk(KERN_ERR
"initrd (0x%08lx - 0x%08lx) extends beyond "
153 "physical memory - disabling initrd\n",
154 phys_initrd_start
, end
);
155 phys_initrd_start
= phys_initrd_size
= 0;
162 static inline void map_memory_bank(struct membank
*bank
)
167 map
.pfn
= __phys_to_pfn(bank
->start
);
168 map
.virtual = __phys_to_virt(bank
->start
);
169 map
.length
= bank
->size
;
170 map
.type
= MT_MEMORY
;
172 create_mapping(&map
);
176 static unsigned long __init
177 bootmem_init_node(int node
, int initrd_node
, struct meminfo
*mi
)
179 unsigned long zone_size
[MAX_NR_ZONES
], zhole_size
[MAX_NR_ZONES
];
180 unsigned long start_pfn
, end_pfn
, boot_pfn
;
181 unsigned int boot_pages
;
189 * Calculate the pfn range, and map the memory banks for this node.
191 for_each_nodebank(i
, mi
, node
) {
192 struct membank
*bank
= &mi
->bank
[i
];
193 unsigned long start
, end
;
195 start
= bank
->start
>> PAGE_SHIFT
;
196 end
= (bank
->start
+ bank
->size
) >> PAGE_SHIFT
;
198 if (start_pfn
> start
)
203 map_memory_bank(bank
);
207 * If there is no memory in this node, ignore it.
213 * Allocate the bootmem bitmap page.
215 boot_pages
= bootmem_bootmap_pages(end_pfn
- start_pfn
);
216 boot_pfn
= find_bootmap_pfn(node
, mi
, boot_pages
);
219 * Initialise the bootmem allocator for this node, handing the
220 * memory banks over to bootmem.
222 node_set_online(node
);
223 pgdat
= NODE_DATA(node
);
224 init_bootmem_node(pgdat
, boot_pfn
, start_pfn
, end_pfn
);
226 for_each_nodebank(i
, mi
, node
)
227 free_bootmem_node(pgdat
, mi
->bank
[i
].start
, mi
->bank
[i
].size
);
230 * Reserve the bootmem bitmap for this node.
232 reserve_bootmem_node(pgdat
, boot_pfn
<< PAGE_SHIFT
,
233 boot_pages
<< PAGE_SHIFT
);
235 #ifdef CONFIG_BLK_DEV_INITRD
237 * If the initrd is in this node, reserve its memory.
239 if (node
== initrd_node
) {
240 reserve_bootmem_node(pgdat
, phys_initrd_start
,
242 initrd_start
= __phys_to_virt(phys_initrd_start
);
243 initrd_end
= initrd_start
+ phys_initrd_size
;
248 * Finally, reserve any node zero regions.
251 reserve_node_zero(pgdat
);
254 * initialise the zones within this node.
256 memset(zone_size
, 0, sizeof(zone_size
));
257 memset(zhole_size
, 0, sizeof(zhole_size
));
260 * The size of this node has already been determined. If we need
261 * to do anything fancy with the allocation of this memory to the
262 * zones, now is the time to do it.
264 zone_size
[0] = end_pfn
- start_pfn
;
267 * For each bank in this node, calculate the size of the holes.
268 * holes = node_size - sum(bank_sizes_in_node)
270 zhole_size
[0] = zone_size
[0];
271 for_each_nodebank(i
, mi
, node
)
272 zhole_size
[0] -= mi
->bank
[i
].size
>> PAGE_SHIFT
;
275 * Adjust the sizes according to any special requirements for
278 arch_adjust_zones(node
, zone_size
, zhole_size
);
280 free_area_init_node(node
, pgdat
, zone_size
, start_pfn
, zhole_size
);
285 void __init
bootmem_init(struct meminfo
*mi
)
287 unsigned long memend_pfn
= 0;
288 int node
, initrd_node
, i
;
291 * Invalidate the node number for empty or invalid memory banks
293 for (i
= 0; i
< mi
->nr_banks
; i
++)
294 if (mi
->bank
[i
].size
== 0 || mi
->bank
[i
].node
>= MAX_NUMNODES
)
295 mi
->bank
[i
].node
= -1;
297 memcpy(&meminfo
, mi
, sizeof(meminfo
));
300 * Locate which node contains the ramdisk image, if any.
302 initrd_node
= check_initrd(mi
);
305 * Run through each node initialising the bootmem allocator.
307 for_each_node(node
) {
308 unsigned long end_pfn
;
310 end_pfn
= bootmem_init_node(node
, initrd_node
, mi
);
313 * Remember the highest memory PFN.
315 if (end_pfn
> memend_pfn
)
316 memend_pfn
= end_pfn
;
319 high_memory
= __va(memend_pfn
<< PAGE_SHIFT
);
322 * This doesn't seem to be used by the Linux memory manager any
323 * more, but is used by ll_rw_block. If we can get rid of it, we
324 * also get rid of some of the stuff above as well.
326 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
327 * the system, not the maximum PFN.
329 max_pfn
= max_low_pfn
= memend_pfn
- PHYS_PFN_OFFSET
;
332 static inline void free_area(unsigned long addr
, unsigned long end
, char *s
)
334 unsigned int size
= (end
- addr
) >> 10;
336 for (; addr
< end
; addr
+= PAGE_SIZE
) {
337 struct page
*page
= virt_to_page(addr
);
338 ClearPageReserved(page
);
339 init_page_count(page
);
345 printk(KERN_INFO
"Freeing %s memory: %dK\n", s
, size
);
349 free_memmap(int node
, unsigned long start_pfn
, unsigned long end_pfn
)
351 struct page
*start_pg
, *end_pg
;
352 unsigned long pg
, pgend
;
355 * Convert start_pfn/end_pfn to a struct page pointer.
357 start_pg
= pfn_to_page(start_pfn
);
358 end_pg
= pfn_to_page(end_pfn
);
361 * Convert to physical addresses, and
362 * round start upwards and end downwards.
364 pg
= PAGE_ALIGN(__pa(start_pg
));
365 pgend
= __pa(end_pg
) & PAGE_MASK
;
368 * If there are free pages between these,
369 * free the section of the memmap array.
372 free_bootmem_node(NODE_DATA(node
), pg
, pgend
- pg
);
376 * The mem_map array can get very big. Free the unused area of the memory map.
378 static void __init
free_unused_memmap_node(int node
, struct meminfo
*mi
)
380 unsigned long bank_start
, prev_bank_end
= 0;
384 * [FIXME] This relies on each bank being in address order. This
385 * may not be the case, especially if the user has provided the
386 * information on the command line.
388 for_each_nodebank(i
, mi
, node
) {
389 bank_start
= mi
->bank
[i
].start
>> PAGE_SHIFT
;
390 if (bank_start
< prev_bank_end
) {
391 printk(KERN_ERR
"MEM: unordered memory banks. "
392 "Not freeing memmap.\n");
397 * If we had a previous bank, and there is a space
398 * between the current bank and the previous, free it.
400 if (prev_bank_end
&& prev_bank_end
!= bank_start
)
401 free_memmap(node
, prev_bank_end
, bank_start
);
403 prev_bank_end
= (mi
->bank
[i
].start
+
404 mi
->bank
[i
].size
) >> PAGE_SHIFT
;
409 * mem_init() marks the free areas in the mem_map and tells us how much
410 * memory is free. This is done after various parts of the system have
411 * claimed their memory after the kernel image.
413 void __init
mem_init(void)
415 unsigned int codepages
, datapages
, initpages
;
418 codepages
= &_etext
- &_text
;
419 datapages
= &_end
- &__data_start
;
420 initpages
= &__init_end
- &__init_begin
;
422 #ifndef CONFIG_DISCONTIGMEM
423 max_mapnr
= virt_to_page(high_memory
) - mem_map
;
426 /* this will put all unused low memory onto the freelists */
427 for_each_online_node(node
) {
428 pg_data_t
*pgdat
= NODE_DATA(node
);
430 free_unused_memmap_node(node
, &meminfo
);
432 if (pgdat
->node_spanned_pages
!= 0)
433 totalram_pages
+= free_all_bootmem_node(pgdat
);
437 /* now that our DMA memory is actually so designated, we can free it */
438 free_area(PAGE_OFFSET
, (unsigned long)swapper_pg_dir
, NULL
);
442 * Since our memory may not be contiguous, calculate the
443 * real number of pages we have in this system
445 printk(KERN_INFO
"Memory:");
448 for (i
= 0; i
< meminfo
.nr_banks
; i
++) {
449 num_physpages
+= meminfo
.bank
[i
].size
>> PAGE_SHIFT
;
450 printk(" %ldMB", meminfo
.bank
[i
].size
>> 20);
453 printk(" = %luMB total\n", num_physpages
>> (20 - PAGE_SHIFT
));
454 printk(KERN_NOTICE
"Memory: %luKB available (%dK code, "
455 "%dK data, %dK init)\n",
456 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
457 codepages
>> 10, datapages
>> 10, initpages
>> 10);
459 if (PAGE_SIZE
>= 16384 && num_physpages
<= 128) {
460 extern int sysctl_overcommit_memory
;
462 * On a machine this small we won't get
463 * anywhere without overcommit, so turn
466 sysctl_overcommit_memory
= OVERCOMMIT_ALWAYS
;
470 void free_initmem(void)
472 if (!machine_is_integrator() && !machine_is_cintegrator()) {
473 free_area((unsigned long)(&__init_begin
),
474 (unsigned long)(&__init_end
),
479 #ifdef CONFIG_BLK_DEV_INITRD
481 static int keep_initrd
;
483 void free_initrd_mem(unsigned long start
, unsigned long end
)
486 free_area(start
, end
, "initrd");
489 static int __init
keepinitrd_setup(char *__unused
)
495 __setup("keepinitrd", keepinitrd_setup
);