ARM: 6246/1: mmci: support larger MMCIDATALENGTH register
[linux-2.6.git] / arch / arm / mm / init.c
1 /*
2  *  linux/arch/arm/mm/init.c
3  *
4  *  Copyright (C) 1995-2005 Russell King
5  *
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.
9  */
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
21 #include <asm/mach-types.h>
22 #include <asm/sections.h>
23 #include <asm/setup.h>
24 #include <asm/sizes.h>
25 #include <asm/tlb.h>
26 #include <asm/fixmap.h>
27
28 #include <asm/mach/arch.h>
29 #include <asm/mach/map.h>
30
31 #include "mm.h"
32
33 static unsigned long phys_initrd_start __initdata = 0;
34 static unsigned long phys_initrd_size __initdata = 0;
35
36 static int __init early_initrd(char *p)
37 {
38         unsigned long start, size;
39         char *endp;
40
41         start = memparse(p, &endp);
42         if (*endp == ',') {
43                 size = memparse(endp + 1, NULL);
44
45                 phys_initrd_start = start;
46                 phys_initrd_size = size;
47         }
48         return 0;
49 }
50 early_param("initrd", early_initrd);
51
52 static int __init parse_tag_initrd(const struct tag *tag)
53 {
54         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
55                 "please update your bootloader.\n");
56         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
57         phys_initrd_size = tag->u.initrd.size;
58         return 0;
59 }
60
61 __tagtable(ATAG_INITRD, parse_tag_initrd);
62
63 static int __init parse_tag_initrd2(const struct tag *tag)
64 {
65         phys_initrd_start = tag->u.initrd.start;
66         phys_initrd_size = tag->u.initrd.size;
67         return 0;
68 }
69
70 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
71
72 /*
73  * This keeps memory configuration data used by a couple memory
74  * initialization functions, as well as show_mem() for the skipping
75  * of holes in the memory map.  It is populated by arm_add_memory().
76  */
77 struct meminfo meminfo;
78
79 void show_mem(void)
80 {
81         int free = 0, total = 0, reserved = 0;
82         int shared = 0, cached = 0, slab = 0, node, i;
83         struct meminfo * mi = &meminfo;
84
85         printk("Mem-info:\n");
86         show_free_areas();
87         for_each_online_node(node) {
88                 for_each_nodebank (i,mi,node) {
89                         struct membank *bank = &mi->bank[i];
90                         unsigned int pfn1, pfn2;
91                         struct page *page, *end;
92
93                         pfn1 = bank_pfn_start(bank);
94                         pfn2 = bank_pfn_end(bank);
95
96                         page = pfn_to_page(pfn1);
97                         end  = pfn_to_page(pfn2 - 1) + 1;
98
99                         do {
100                                 total++;
101                                 if (PageReserved(page))
102                                         reserved++;
103                                 else if (PageSwapCache(page))
104                                         cached++;
105                                 else if (PageSlab(page))
106                                         slab++;
107                                 else if (!page_count(page))
108                                         free++;
109                                 else
110                                         shared += page_count(page) - 1;
111                                 page++;
112                         } while (page < end);
113                 }
114         }
115
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);
122 }
123
124 static void __init find_node_limits(int node, struct meminfo *mi,
125         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
126 {
127         int i;
128
129         *min = -1UL;
130         *max_low = *max_high = 0;
131
132         for_each_nodebank(i, mi, node) {
133                 struct membank *bank = &mi->bank[i];
134                 unsigned long start, end;
135
136                 start = bank_pfn_start(bank);
137                 end = bank_pfn_end(bank);
138
139                 if (*min > start)
140                         *min = start;
141                 if (*max_high < end)
142                         *max_high = end;
143                 if (bank->highmem)
144                         continue;
145                 if (*max_low < end)
146                         *max_low = end;
147         }
148 }
149
150 /*
151  * FIXME: We really want to avoid allocating the bootmap bitmap
152  * over the top of the initrd.  Hopefully, this is located towards
153  * the start of a bank, so if we allocate the bootmap bitmap at
154  * the end, we won't clash.
155  */
156 static unsigned int __init
157 find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
158 {
159         unsigned int start_pfn, i, bootmap_pfn;
160
161         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
162         bootmap_pfn = 0;
163
164         for_each_nodebank(i, mi, node) {
165                 struct membank *bank = &mi->bank[i];
166                 unsigned int start, end;
167
168                 start = bank_pfn_start(bank);
169                 end   = bank_pfn_end(bank);
170
171                 if (end < start_pfn)
172                         continue;
173
174                 if (start < start_pfn)
175                         start = start_pfn;
176
177                 if (end <= start)
178                         continue;
179
180                 if (end - start >= bootmap_pages) {
181                         bootmap_pfn = start;
182                         break;
183                 }
184         }
185
186         if (bootmap_pfn == 0)
187                 BUG();
188
189         return bootmap_pfn;
190 }
191
192 static int __init check_initrd(struct meminfo *mi)
193 {
194         int initrd_node = -2;
195 #ifdef CONFIG_BLK_DEV_INITRD
196         unsigned long end = phys_initrd_start + phys_initrd_size;
197
198         /*
199          * Make sure that the initrd is within a valid area of
200          * memory.
201          */
202         if (phys_initrd_size) {
203                 unsigned int i;
204
205                 initrd_node = -1;
206
207                 for (i = 0; i < mi->nr_banks; i++) {
208                         struct membank *bank = &mi->bank[i];
209                         if (bank_phys_start(bank) <= phys_initrd_start &&
210                             end <= bank_phys_end(bank))
211                                 initrd_node = bank->node;
212                 }
213         }
214
215         if (initrd_node == -1) {
216                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
217                        "physical memory - disabling initrd\n",
218                        phys_initrd_start, phys_initrd_size);
219                 phys_initrd_start = phys_initrd_size = 0;
220         }
221 #endif
222
223         return initrd_node;
224 }
225
226 static void __init bootmem_init_node(int node, struct meminfo *mi,
227         unsigned long start_pfn, unsigned long end_pfn)
228 {
229         unsigned long boot_pfn;
230         unsigned int boot_pages;
231         pg_data_t *pgdat;
232         int i;
233
234         /*
235          * Allocate the bootmem bitmap page.
236          */
237         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
238         boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
239
240         /*
241          * Initialise the bootmem allocator for this node, handing the
242          * memory banks over to bootmem.
243          */
244         node_set_online(node);
245         pgdat = NODE_DATA(node);
246         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
247
248         for_each_nodebank(i, mi, node) {
249                 struct membank *bank = &mi->bank[i];
250                 if (!bank->highmem)
251                         free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
252         }
253
254         /*
255          * Reserve the bootmem bitmap for this node.
256          */
257         reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
258                              boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
259 }
260
261 static void __init bootmem_reserve_initrd(int node)
262 {
263 #ifdef CONFIG_BLK_DEV_INITRD
264         pg_data_t *pgdat = NODE_DATA(node);
265         int res;
266
267         res = reserve_bootmem_node(pgdat, phys_initrd_start,
268                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
269
270         if (res == 0) {
271                 initrd_start = __phys_to_virt(phys_initrd_start);
272                 initrd_end = initrd_start + phys_initrd_size;
273         } else {
274                 printk(KERN_ERR
275                         "INITRD: 0x%08lx+0x%08lx overlaps in-use "
276                         "memory region - disabling initrd\n",
277                         phys_initrd_start, phys_initrd_size);
278         }
279 #endif
280 }
281
282 static void __init bootmem_free_node(int node, struct meminfo *mi)
283 {
284         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
285         unsigned long min, max_low, max_high;
286         int i;
287
288         find_node_limits(node, mi, &min, &max_low, &max_high);
289
290         /*
291          * initialise the zones within this node.
292          */
293         memset(zone_size, 0, sizeof(zone_size));
294
295         /*
296          * The size of this node has already been determined.  If we need
297          * to do anything fancy with the allocation of this memory to the
298          * zones, now is the time to do it.
299          */
300         zone_size[0] = max_low - min;
301 #ifdef CONFIG_HIGHMEM
302         zone_size[ZONE_HIGHMEM] = max_high - max_low;
303 #endif
304
305         /*
306          * For each bank in this node, calculate the size of the holes.
307          *  holes = node_size - sum(bank_sizes_in_node)
308          */
309         memcpy(zhole_size, zone_size, sizeof(zhole_size));
310         for_each_nodebank(i, mi, node) {
311                 int idx = 0;
312 #ifdef CONFIG_HIGHMEM
313                 if (mi->bank[i].highmem)
314                         idx = ZONE_HIGHMEM;
315 #endif
316                 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
317         }
318
319         /*
320          * Adjust the sizes according to any special requirements for
321          * this machine type.
322          */
323         arch_adjust_zones(node, zone_size, zhole_size);
324
325         free_area_init_node(node, zone_size, min, zhole_size);
326 }
327
328 #ifndef CONFIG_SPARSEMEM
329 int pfn_valid(unsigned long pfn)
330 {
331         struct meminfo *mi = &meminfo;
332         unsigned int left = 0, right = mi->nr_banks;
333
334         do {
335                 unsigned int mid = (right + left) / 2;
336                 struct membank *bank = &mi->bank[mid];
337
338                 if (pfn < bank_pfn_start(bank))
339                         right = mid;
340                 else if (pfn >= bank_pfn_end(bank))
341                         left = mid + 1;
342                 else
343                         return 1;
344         } while (left < right);
345         return 0;
346 }
347 EXPORT_SYMBOL(pfn_valid);
348
349 static void arm_memory_present(struct meminfo *mi, int node)
350 {
351 }
352 #else
353 static void arm_memory_present(struct meminfo *mi, int node)
354 {
355         int i;
356         for_each_nodebank(i, mi, node) {
357                 struct membank *bank = &mi->bank[i];
358                 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
359         }
360 }
361 #endif
362
363 void __init bootmem_init(void)
364 {
365         struct meminfo *mi = &meminfo;
366         unsigned long min, max_low, max_high;
367         int node, initrd_node;
368
369         /*
370          * Locate which node contains the ramdisk image, if any.
371          */
372         initrd_node = check_initrd(mi);
373
374         max_low = max_high = 0;
375
376         /*
377          * Run through each node initialising the bootmem allocator.
378          */
379         for_each_node(node) {
380                 unsigned long node_low, node_high;
381
382                 find_node_limits(node, mi, &min, &node_low, &node_high);
383
384                 if (node_low > max_low)
385                         max_low = node_low;
386                 if (node_high > max_high)
387                         max_high = node_high;
388
389                 /*
390                  * If there is no memory in this node, ignore it.
391                  * (We can't have nodes which have no lowmem)
392                  */
393                 if (node_low == 0)
394                         continue;
395
396                 bootmem_init_node(node, mi, min, node_low);
397
398                 /*
399                  * Reserve any special node zero regions.
400                  */
401                 if (node == 0)
402                         reserve_node_zero(NODE_DATA(node));
403
404                 /*
405                  * If the initrd is in this node, reserve its memory.
406                  */
407                 if (node == initrd_node)
408                         bootmem_reserve_initrd(node);
409
410                 /*
411                  * Sparsemem tries to allocate bootmem in memory_present(),
412                  * so must be done after the fixed reservations
413                  */
414                 arm_memory_present(mi, node);
415         }
416
417         /*
418          * sparse_init() needs the bootmem allocator up and running.
419          */
420         sparse_init();
421
422         /*
423          * Now free memory in each node - free_area_init_node needs
424          * the sparse mem_map arrays initialized by sparse_init()
425          * for memmap_init_zone(), otherwise all PFNs are invalid.
426          */
427         for_each_node(node)
428                 bootmem_free_node(node, mi);
429
430         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
431
432         /*
433          * This doesn't seem to be used by the Linux memory manager any
434          * more, but is used by ll_rw_block.  If we can get rid of it, we
435          * also get rid of some of the stuff above as well.
436          *
437          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
438          * the system, not the maximum PFN.
439          */
440         max_low_pfn = max_low - PHYS_PFN_OFFSET;
441         max_pfn = max_high - PHYS_PFN_OFFSET;
442 }
443
444 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
445 {
446         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
447
448         for (; pfn < end; pfn++) {
449                 struct page *page = pfn_to_page(pfn);
450                 ClearPageReserved(page);
451                 init_page_count(page);
452                 __free_page(page);
453                 pages++;
454         }
455
456         if (size && s)
457                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
458
459         return pages;
460 }
461
462 static inline void
463 free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
464 {
465         struct page *start_pg, *end_pg;
466         unsigned long pg, pgend;
467
468         /*
469          * Convert start_pfn/end_pfn to a struct page pointer.
470          */
471         start_pg = pfn_to_page(start_pfn - 1) + 1;
472         end_pg = pfn_to_page(end_pfn);
473
474         /*
475          * Convert to physical addresses, and
476          * round start upwards and end downwards.
477          */
478         pg = PAGE_ALIGN(__pa(start_pg));
479         pgend = __pa(end_pg) & PAGE_MASK;
480
481         /*
482          * If there are free pages between these,
483          * free the section of the memmap array.
484          */
485         if (pg < pgend)
486                 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
487 }
488
489 /*
490  * The mem_map array can get very big.  Free the unused area of the memory map.
491  */
492 static void __init free_unused_memmap_node(int node, struct meminfo *mi)
493 {
494         unsigned long bank_start, prev_bank_end = 0;
495         unsigned int i;
496
497         /*
498          * [FIXME] This relies on each bank being in address order.  This
499          * may not be the case, especially if the user has provided the
500          * information on the command line.
501          */
502         for_each_nodebank(i, mi, node) {
503                 struct membank *bank = &mi->bank[i];
504
505                 bank_start = bank_pfn_start(bank);
506                 if (bank_start < prev_bank_end) {
507                         printk(KERN_ERR "MEM: unordered memory banks.  "
508                                 "Not freeing memmap.\n");
509                         break;
510                 }
511
512                 /*
513                  * If we had a previous bank, and there is a space
514                  * between the current bank and the previous, free it.
515                  */
516                 if (prev_bank_end && prev_bank_end != bank_start)
517                         free_memmap(node, prev_bank_end, bank_start);
518
519                 prev_bank_end = bank_pfn_end(bank);
520         }
521 }
522
523 /*
524  * mem_init() marks the free areas in the mem_map and tells us how much
525  * memory is free.  This is done after various parts of the system have
526  * claimed their memory after the kernel image.
527  */
528 void __init mem_init(void)
529 {
530         unsigned long reserved_pages, free_pages;
531         int i, node;
532 #ifdef CONFIG_HAVE_TCM
533         /* These pointers are filled in on TCM detection */
534         extern u32 dtcm_end;
535         extern u32 itcm_end;
536 #endif
537
538 #ifndef CONFIG_DISCONTIGMEM
539         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
540 #endif
541
542         /* this will put all unused low memory onto the freelists */
543         for_each_online_node(node) {
544                 pg_data_t *pgdat = NODE_DATA(node);
545
546                 free_unused_memmap_node(node, &meminfo);
547
548                 if (pgdat->node_spanned_pages != 0)
549                         totalram_pages += free_all_bootmem_node(pgdat);
550         }
551
552 #ifdef CONFIG_SA1111
553         /* now that our DMA memory is actually so designated, we can free it */
554         totalram_pages += free_area(PHYS_PFN_OFFSET,
555                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
556 #endif
557
558 #ifdef CONFIG_HIGHMEM
559         /* set highmem page free */
560         for_each_online_node(node) {
561                 for_each_nodebank (i, &meminfo, node) {
562                         unsigned long start = bank_pfn_start(&meminfo.bank[i]);
563                         unsigned long end = bank_pfn_end(&meminfo.bank[i]);
564                         if (start >= max_low_pfn + PHYS_PFN_OFFSET)
565                                 totalhigh_pages += free_area(start, end, NULL);
566                 }
567         }
568         totalram_pages += totalhigh_pages;
569 #endif
570
571         reserved_pages = free_pages = 0;
572
573         for_each_online_node(node) {
574                 for_each_nodebank(i, &meminfo, node) {
575                         struct membank *bank = &meminfo.bank[i];
576                         unsigned int pfn1, pfn2;
577                         struct page *page, *end;
578
579                         pfn1 = bank_pfn_start(bank);
580                         pfn2 = bank_pfn_end(bank);
581
582                         page = pfn_to_page(pfn1);
583                         end  = pfn_to_page(pfn2 - 1) + 1;
584
585                         do {
586                                 if (PageReserved(page))
587                                         reserved_pages++;
588                                 else if (!page_count(page))
589                                         free_pages++;
590                                 page++;
591                         } while (page < end);
592                 }
593         }
594
595         /*
596          * Since our memory may not be contiguous, calculate the
597          * real number of pages we have in this system
598          */
599         printk(KERN_INFO "Memory:");
600         num_physpages = 0;
601         for (i = 0; i < meminfo.nr_banks; i++) {
602                 num_physpages += bank_pfn_size(&meminfo.bank[i]);
603                 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
604         }
605         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
606
607         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
608                 nr_free_pages() << (PAGE_SHIFT-10),
609                 free_pages << (PAGE_SHIFT-10),
610                 reserved_pages << (PAGE_SHIFT-10),
611                 totalhigh_pages << (PAGE_SHIFT-10));
612
613 #define MLK(b, t) b, t, ((t) - (b)) >> 10
614 #define MLM(b, t) b, t, ((t) - (b)) >> 20
615 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
616
617         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
618                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
619 #ifdef CONFIG_HAVE_TCM
620                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
621                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
622 #endif
623                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
624 #ifdef CONFIG_MMU
625                         "    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
626 #endif
627                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
628                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
629 #ifdef CONFIG_HIGHMEM
630                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
631 #endif
632                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
633                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
634                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
635                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
636
637                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
638                                 (PAGE_SIZE)),
639 #ifdef CONFIG_HAVE_TCM
640                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
641                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
642 #endif
643                         MLK(FIXADDR_START, FIXADDR_TOP),
644 #ifdef CONFIG_MMU
645                         MLM(CONSISTENT_BASE, CONSISTENT_END),
646 #endif
647                         MLM(VMALLOC_START, VMALLOC_END),
648                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
649 #ifdef CONFIG_HIGHMEM
650                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
651                                 (PAGE_SIZE)),
652 #endif
653                         MLM(MODULES_VADDR, MODULES_END),
654
655                         MLK_ROUNDUP(__init_begin, __init_end),
656                         MLK_ROUNDUP(_text, _etext),
657                         MLK_ROUNDUP(_data, _edata));
658
659 #undef MLK
660 #undef MLM
661 #undef MLK_ROUNDUP
662
663         /*
664          * Check boundaries twice: Some fundamental inconsistencies can
665          * be detected at build time already.
666          */
667 #ifdef CONFIG_MMU
668         BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
669         BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
670
671         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
672         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
673 #endif
674
675 #ifdef CONFIG_HIGHMEM
676         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
677         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
678 #endif
679
680         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
681                 extern int sysctl_overcommit_memory;
682                 /*
683                  * On a machine this small we won't get
684                  * anywhere without overcommit, so turn
685                  * it on by default.
686                  */
687                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
688         }
689 }
690
691 void free_initmem(void)
692 {
693 #ifdef CONFIG_HAVE_TCM
694         extern char __tcm_start, __tcm_end;
695
696         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
697                                     __phys_to_pfn(__pa(&__tcm_end)),
698                                     "TCM link");
699 #endif
700
701         if (!machine_is_integrator() && !machine_is_cintegrator())
702                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
703                                             __phys_to_pfn(__pa(__init_end)),
704                                             "init");
705 }
706
707 #ifdef CONFIG_BLK_DEV_INITRD
708
709 static int keep_initrd;
710
711 void free_initrd_mem(unsigned long start, unsigned long end)
712 {
713         if (!keep_initrd)
714                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
715                                             __phys_to_pfn(__pa(end)),
716                                             "initrd");
717 }
718
719 static int __init keepinitrd_setup(char *__unused)
720 {
721         keep_initrd = 1;
722         return 1;
723 }
724
725 __setup("keepinitrd", keepinitrd_setup);
726 #endif