xref: /openbmc/linux/arch/arm/mm/init.c (revision 4800cd83)
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 #include <linux/memblock.h>
21 #include <linux/sort.h>
22 
23 #include <asm/mach-types.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/sizes.h>
27 #include <asm/tlb.h>
28 #include <asm/fixmap.h>
29 
30 #include <asm/mach/arch.h>
31 #include <asm/mach/map.h>
32 
33 #include "mm.h"
34 
35 static unsigned long phys_initrd_start __initdata = 0;
36 static unsigned long phys_initrd_size __initdata = 0;
37 
38 static int __init early_initrd(char *p)
39 {
40 	unsigned long start, size;
41 	char *endp;
42 
43 	start = memparse(p, &endp);
44 	if (*endp == ',') {
45 		size = memparse(endp + 1, NULL);
46 
47 		phys_initrd_start = start;
48 		phys_initrd_size = size;
49 	}
50 	return 0;
51 }
52 early_param("initrd", early_initrd);
53 
54 static int __init parse_tag_initrd(const struct tag *tag)
55 {
56 	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
57 		"please update your bootloader.\n");
58 	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
59 	phys_initrd_size = tag->u.initrd.size;
60 	return 0;
61 }
62 
63 __tagtable(ATAG_INITRD, parse_tag_initrd);
64 
65 static int __init parse_tag_initrd2(const struct tag *tag)
66 {
67 	phys_initrd_start = tag->u.initrd.start;
68 	phys_initrd_size = tag->u.initrd.size;
69 	return 0;
70 }
71 
72 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
73 
74 /*
75  * This keeps memory configuration data used by a couple memory
76  * initialization functions, as well as show_mem() for the skipping
77  * of holes in the memory map.  It is populated by arm_add_memory().
78  */
79 struct meminfo meminfo;
80 
81 void show_mem(void)
82 {
83 	int free = 0, total = 0, reserved = 0;
84 	int shared = 0, cached = 0, slab = 0, i;
85 	struct meminfo * mi = &meminfo;
86 
87 	printk("Mem-info:\n");
88 	show_free_areas();
89 
90 	for_each_bank (i, mi) {
91 		struct membank *bank = &mi->bank[i];
92 		unsigned int pfn1, pfn2;
93 		struct page *page, *end;
94 
95 		pfn1 = bank_pfn_start(bank);
96 		pfn2 = bank_pfn_end(bank);
97 
98 		page = pfn_to_page(pfn1);
99 		end  = pfn_to_page(pfn2 - 1) + 1;
100 
101 		do {
102 			total++;
103 			if (PageReserved(page))
104 				reserved++;
105 			else if (PageSwapCache(page))
106 				cached++;
107 			else if (PageSlab(page))
108 				slab++;
109 			else if (!page_count(page))
110 				free++;
111 			else
112 				shared += page_count(page) - 1;
113 			page++;
114 		} while (page < end);
115 	}
116 
117 	printk("%d pages of RAM\n", total);
118 	printk("%d free pages\n", free);
119 	printk("%d reserved pages\n", reserved);
120 	printk("%d slab pages\n", slab);
121 	printk("%d pages shared\n", shared);
122 	printk("%d pages swap cached\n", cached);
123 }
124 
125 static void __init find_limits(unsigned long *min, unsigned long *max_low,
126 	unsigned long *max_high)
127 {
128 	struct meminfo *mi = &meminfo;
129 	int i;
130 
131 	*min = -1UL;
132 	*max_low = *max_high = 0;
133 
134 	for_each_bank (i, mi) {
135 		struct membank *bank = &mi->bank[i];
136 		unsigned long start, end;
137 
138 		start = bank_pfn_start(bank);
139 		end = bank_pfn_end(bank);
140 
141 		if (*min > start)
142 			*min = start;
143 		if (*max_high < end)
144 			*max_high = end;
145 		if (bank->highmem)
146 			continue;
147 		if (*max_low < end)
148 			*max_low = end;
149 	}
150 }
151 
152 static void __init arm_bootmem_init(unsigned long start_pfn,
153 	unsigned long end_pfn)
154 {
155 	struct memblock_region *reg;
156 	unsigned int boot_pages;
157 	phys_addr_t bitmap;
158 	pg_data_t *pgdat;
159 
160 	/*
161 	 * Allocate the bootmem bitmap page.  This must be in a region
162 	 * of memory which has already been mapped.
163 	 */
164 	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
165 	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
166 				__pfn_to_phys(end_pfn));
167 
168 	/*
169 	 * Initialise the bootmem allocator, handing the
170 	 * memory banks over to bootmem.
171 	 */
172 	node_set_online(0);
173 	pgdat = NODE_DATA(0);
174 	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
175 
176 	/* Free the lowmem regions from memblock into bootmem. */
177 	for_each_memblock(memory, reg) {
178 		unsigned long start = memblock_region_memory_base_pfn(reg);
179 		unsigned long end = memblock_region_memory_end_pfn(reg);
180 
181 		if (end >= end_pfn)
182 			end = end_pfn;
183 		if (start >= end)
184 			break;
185 
186 		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
187 	}
188 
189 	/* Reserve the lowmem memblock reserved regions in bootmem. */
190 	for_each_memblock(reserved, reg) {
191 		unsigned long start = memblock_region_reserved_base_pfn(reg);
192 		unsigned long end = memblock_region_reserved_end_pfn(reg);
193 
194 		if (end >= end_pfn)
195 			end = end_pfn;
196 		if (start >= end)
197 			break;
198 
199 		reserve_bootmem(__pfn_to_phys(start),
200 			        (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
201 	}
202 }
203 
204 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
205 	unsigned long max_high)
206 {
207 	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
208 	struct memblock_region *reg;
209 
210 	/*
211 	 * initialise the zones.
212 	 */
213 	memset(zone_size, 0, sizeof(zone_size));
214 
215 	/*
216 	 * The memory size has already been determined.  If we need
217 	 * to do anything fancy with the allocation of this memory
218 	 * to the zones, now is the time to do it.
219 	 */
220 	zone_size[0] = max_low - min;
221 #ifdef CONFIG_HIGHMEM
222 	zone_size[ZONE_HIGHMEM] = max_high - max_low;
223 #endif
224 
225 	/*
226 	 * Calculate the size of the holes.
227 	 *  holes = node_size - sum(bank_sizes)
228 	 */
229 	memcpy(zhole_size, zone_size, sizeof(zhole_size));
230 	for_each_memblock(memory, reg) {
231 		unsigned long start = memblock_region_memory_base_pfn(reg);
232 		unsigned long end = memblock_region_memory_end_pfn(reg);
233 
234 		if (start < max_low) {
235 			unsigned long low_end = min(end, max_low);
236 			zhole_size[0] -= low_end - start;
237 		}
238 #ifdef CONFIG_HIGHMEM
239 		if (end > max_low) {
240 			unsigned long high_start = max(start, max_low);
241 			zhole_size[ZONE_HIGHMEM] -= end - high_start;
242 		}
243 #endif
244 	}
245 
246 	/*
247 	 * Adjust the sizes according to any special requirements for
248 	 * this machine type.
249 	 */
250 	arch_adjust_zones(zone_size, zhole_size);
251 
252 	free_area_init_node(0, zone_size, min, zhole_size);
253 }
254 
255 #ifndef CONFIG_SPARSEMEM
256 int pfn_valid(unsigned long pfn)
257 {
258 	return memblock_is_memory(pfn << PAGE_SHIFT);
259 }
260 EXPORT_SYMBOL(pfn_valid);
261 
262 static void arm_memory_present(void)
263 {
264 }
265 #else
266 static void arm_memory_present(void)
267 {
268 	struct memblock_region *reg;
269 
270 	for_each_memblock(memory, reg)
271 		memory_present(0, memblock_region_memory_base_pfn(reg),
272 			       memblock_region_memory_end_pfn(reg));
273 }
274 #endif
275 
276 static int __init meminfo_cmp(const void *_a, const void *_b)
277 {
278 	const struct membank *a = _a, *b = _b;
279 	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
280 	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
281 }
282 
283 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
284 {
285 	int i;
286 
287 	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
288 
289 	memblock_init();
290 	for (i = 0; i < mi->nr_banks; i++)
291 		memblock_add(mi->bank[i].start, mi->bank[i].size);
292 
293 	/* Register the kernel text, kernel data and initrd with memblock. */
294 #ifdef CONFIG_XIP_KERNEL
295 	memblock_reserve(__pa(_sdata), _end - _sdata);
296 #else
297 	memblock_reserve(__pa(_stext), _end - _stext);
298 #endif
299 #ifdef CONFIG_BLK_DEV_INITRD
300 	if (phys_initrd_size &&
301 	    memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
302 		pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
303 		       phys_initrd_start, phys_initrd_size);
304 		phys_initrd_start = phys_initrd_size = 0;
305 	}
306 	if (phys_initrd_size) {
307 		memblock_reserve(phys_initrd_start, phys_initrd_size);
308 
309 		/* Now convert initrd to virtual addresses */
310 		initrd_start = __phys_to_virt(phys_initrd_start);
311 		initrd_end = initrd_start + phys_initrd_size;
312 	}
313 #endif
314 
315 	arm_mm_memblock_reserve();
316 
317 	/* reserve any platform specific memblock areas */
318 	if (mdesc->reserve)
319 		mdesc->reserve();
320 
321 	memblock_analyze();
322 	memblock_dump_all();
323 }
324 
325 void __init bootmem_init(void)
326 {
327 	unsigned long min, max_low, max_high;
328 
329 	max_low = max_high = 0;
330 
331 	find_limits(&min, &max_low, &max_high);
332 
333 	arm_bootmem_init(min, max_low);
334 
335 	/*
336 	 * Sparsemem tries to allocate bootmem in memory_present(),
337 	 * so must be done after the fixed reservations
338 	 */
339 	arm_memory_present();
340 
341 	/*
342 	 * sparse_init() needs the bootmem allocator up and running.
343 	 */
344 	sparse_init();
345 
346 	/*
347 	 * Now free the memory - free_area_init_node needs
348 	 * the sparse mem_map arrays initialized by sparse_init()
349 	 * for memmap_init_zone(), otherwise all PFNs are invalid.
350 	 */
351 	arm_bootmem_free(min, max_low, max_high);
352 
353 	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
354 
355 	/*
356 	 * This doesn't seem to be used by the Linux memory manager any
357 	 * more, but is used by ll_rw_block.  If we can get rid of it, we
358 	 * also get rid of some of the stuff above as well.
359 	 *
360 	 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
361 	 * the system, not the maximum PFN.
362 	 */
363 	max_low_pfn = max_low - PHYS_PFN_OFFSET;
364 	max_pfn = max_high - PHYS_PFN_OFFSET;
365 }
366 
367 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
368 {
369 	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
370 
371 	for (; pfn < end; pfn++) {
372 		struct page *page = pfn_to_page(pfn);
373 		ClearPageReserved(page);
374 		init_page_count(page);
375 		__free_page(page);
376 		pages++;
377 	}
378 
379 	if (size && s)
380 		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
381 
382 	return pages;
383 }
384 
385 static inline void
386 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
387 {
388 	struct page *start_pg, *end_pg;
389 	unsigned long pg, pgend;
390 
391 	/*
392 	 * Convert start_pfn/end_pfn to a struct page pointer.
393 	 */
394 	start_pg = pfn_to_page(start_pfn - 1) + 1;
395 	end_pg = pfn_to_page(end_pfn);
396 
397 	/*
398 	 * Convert to physical addresses, and
399 	 * round start upwards and end downwards.
400 	 */
401 	pg = PAGE_ALIGN(__pa(start_pg));
402 	pgend = __pa(end_pg) & PAGE_MASK;
403 
404 	/*
405 	 * If there are free pages between these,
406 	 * free the section of the memmap array.
407 	 */
408 	if (pg < pgend)
409 		free_bootmem(pg, pgend - pg);
410 }
411 
412 /*
413  * The mem_map array can get very big.  Free the unused area of the memory map.
414  */
415 static void __init free_unused_memmap(struct meminfo *mi)
416 {
417 	unsigned long bank_start, prev_bank_end = 0;
418 	unsigned int i;
419 
420 	/*
421 	 * This relies on each bank being in address order.
422 	 * The banks are sorted previously in bootmem_init().
423 	 */
424 	for_each_bank(i, mi) {
425 		struct membank *bank = &mi->bank[i];
426 
427 		bank_start = bank_pfn_start(bank);
428 
429 		/*
430 		 * If we had a previous bank, and there is a space
431 		 * between the current bank and the previous, free it.
432 		 */
433 		if (prev_bank_end && prev_bank_end < bank_start)
434 			free_memmap(prev_bank_end, bank_start);
435 
436 		/*
437 		 * Align up here since the VM subsystem insists that the
438 		 * memmap entries are valid from the bank end aligned to
439 		 * MAX_ORDER_NR_PAGES.
440 		 */
441 		prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
442 	}
443 }
444 
445 static void __init free_highpages(void)
446 {
447 #ifdef CONFIG_HIGHMEM
448 	unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
449 	struct memblock_region *mem, *res;
450 
451 	/* set highmem page free */
452 	for_each_memblock(memory, mem) {
453 		unsigned long start = memblock_region_memory_base_pfn(mem);
454 		unsigned long end = memblock_region_memory_end_pfn(mem);
455 
456 		/* Ignore complete lowmem entries */
457 		if (end <= max_low)
458 			continue;
459 
460 		/* Truncate partial highmem entries */
461 		if (start < max_low)
462 			start = max_low;
463 
464 		/* Find and exclude any reserved regions */
465 		for_each_memblock(reserved, res) {
466 			unsigned long res_start, res_end;
467 
468 			res_start = memblock_region_reserved_base_pfn(res);
469 			res_end = memblock_region_reserved_end_pfn(res);
470 
471 			if (res_end < start)
472 				continue;
473 			if (res_start < start)
474 				res_start = start;
475 			if (res_start > end)
476 				res_start = end;
477 			if (res_end > end)
478 				res_end = end;
479 			if (res_start != start)
480 				totalhigh_pages += free_area(start, res_start,
481 							     NULL);
482 			start = res_end;
483 			if (start == end)
484 				break;
485 		}
486 
487 		/* And now free anything which remains */
488 		if (start < end)
489 			totalhigh_pages += free_area(start, end, NULL);
490 	}
491 	totalram_pages += totalhigh_pages;
492 #endif
493 }
494 
495 /*
496  * mem_init() marks the free areas in the mem_map and tells us how much
497  * memory is free.  This is done after various parts of the system have
498  * claimed their memory after the kernel image.
499  */
500 void __init mem_init(void)
501 {
502 	unsigned long reserved_pages, free_pages;
503 	struct memblock_region *reg;
504 	int i;
505 #ifdef CONFIG_HAVE_TCM
506 	/* These pointers are filled in on TCM detection */
507 	extern u32 dtcm_end;
508 	extern u32 itcm_end;
509 #endif
510 
511 	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
512 
513 	/* this will put all unused low memory onto the freelists */
514 	free_unused_memmap(&meminfo);
515 
516 	totalram_pages += free_all_bootmem();
517 
518 #ifdef CONFIG_SA1111
519 	/* now that our DMA memory is actually so designated, we can free it */
520 	totalram_pages += free_area(PHYS_PFN_OFFSET,
521 				    __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
522 #endif
523 
524 	free_highpages();
525 
526 	reserved_pages = free_pages = 0;
527 
528 	for_each_bank(i, &meminfo) {
529 		struct membank *bank = &meminfo.bank[i];
530 		unsigned int pfn1, pfn2;
531 		struct page *page, *end;
532 
533 		pfn1 = bank_pfn_start(bank);
534 		pfn2 = bank_pfn_end(bank);
535 
536 		page = pfn_to_page(pfn1);
537 		end  = pfn_to_page(pfn2 - 1) + 1;
538 
539 		do {
540 			if (PageReserved(page))
541 				reserved_pages++;
542 			else if (!page_count(page))
543 				free_pages++;
544 			page++;
545 		} while (page < end);
546 	}
547 
548 	/*
549 	 * Since our memory may not be contiguous, calculate the
550 	 * real number of pages we have in this system
551 	 */
552 	printk(KERN_INFO "Memory:");
553 	num_physpages = 0;
554 	for_each_memblock(memory, reg) {
555 		unsigned long pages = memblock_region_memory_end_pfn(reg) -
556 			memblock_region_memory_base_pfn(reg);
557 		num_physpages += pages;
558 		printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
559 	}
560 	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
561 
562 	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
563 		nr_free_pages() << (PAGE_SHIFT-10),
564 		free_pages << (PAGE_SHIFT-10),
565 		reserved_pages << (PAGE_SHIFT-10),
566 		totalhigh_pages << (PAGE_SHIFT-10));
567 
568 #define MLK(b, t) b, t, ((t) - (b)) >> 10
569 #define MLM(b, t) b, t, ((t) - (b)) >> 20
570 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
571 
572 	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
573 			"    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
574 #ifdef CONFIG_HAVE_TCM
575 			"    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
576 			"    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
577 #endif
578 			"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
579 #ifdef CONFIG_MMU
580 			"    DMA     : 0x%08lx - 0x%08lx   (%4ld MB)\n"
581 #endif
582 			"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
583 			"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
584 #ifdef CONFIG_HIGHMEM
585 			"    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
586 #endif
587 			"    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
588 			"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
589 			"      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
590 			"      .data : 0x%p" " - 0x%p" "   (%4d kB)\n",
591 
592 			MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
593 				(PAGE_SIZE)),
594 #ifdef CONFIG_HAVE_TCM
595 			MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
596 			MLK(ITCM_OFFSET, (unsigned long) itcm_end),
597 #endif
598 			MLK(FIXADDR_START, FIXADDR_TOP),
599 #ifdef CONFIG_MMU
600 			MLM(CONSISTENT_BASE, CONSISTENT_END),
601 #endif
602 			MLM(VMALLOC_START, VMALLOC_END),
603 			MLM(PAGE_OFFSET, (unsigned long)high_memory),
604 #ifdef CONFIG_HIGHMEM
605 			MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
606 				(PAGE_SIZE)),
607 #endif
608 			MLM(MODULES_VADDR, MODULES_END),
609 
610 			MLK_ROUNDUP(__init_begin, __init_end),
611 			MLK_ROUNDUP(_text, _etext),
612 			MLK_ROUNDUP(_sdata, _edata));
613 
614 #undef MLK
615 #undef MLM
616 #undef MLK_ROUNDUP
617 
618 	/*
619 	 * Check boundaries twice: Some fundamental inconsistencies can
620 	 * be detected at build time already.
621 	 */
622 #ifdef CONFIG_MMU
623 	BUILD_BUG_ON(VMALLOC_END			> CONSISTENT_BASE);
624 	BUG_ON(VMALLOC_END				> CONSISTENT_BASE);
625 
626 	BUILD_BUG_ON(TASK_SIZE				> MODULES_VADDR);
627 	BUG_ON(TASK_SIZE 				> MODULES_VADDR);
628 #endif
629 
630 #ifdef CONFIG_HIGHMEM
631 	BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
632 	BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE	> PAGE_OFFSET);
633 #endif
634 
635 	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
636 		extern int sysctl_overcommit_memory;
637 		/*
638 		 * On a machine this small we won't get
639 		 * anywhere without overcommit, so turn
640 		 * it on by default.
641 		 */
642 		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
643 	}
644 }
645 
646 void free_initmem(void)
647 {
648 #ifdef CONFIG_HAVE_TCM
649 	extern char __tcm_start, __tcm_end;
650 
651 	totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
652 				    __phys_to_pfn(__pa(&__tcm_end)),
653 				    "TCM link");
654 #endif
655 
656 	if (!machine_is_integrator() && !machine_is_cintegrator())
657 		totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
658 					    __phys_to_pfn(__pa(__init_end)),
659 					    "init");
660 }
661 
662 #ifdef CONFIG_BLK_DEV_INITRD
663 
664 static int keep_initrd;
665 
666 void free_initrd_mem(unsigned long start, unsigned long end)
667 {
668 	if (!keep_initrd)
669 		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
670 					    __phys_to_pfn(__pa(end)),
671 					    "initrd");
672 }
673 
674 static int __init keepinitrd_setup(char *__unused)
675 {
676 	keep_initrd = 1;
677 	return 1;
678 }
679 
680 __setup("keepinitrd", keepinitrd_setup);
681 #endif
682