xref: /openbmc/linux/arch/arm/mm/init.c (revision 65939301)
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/export.h>
17 #include <linux/nodemask.h>
18 #include <linux/initrd.h>
19 #include <linux/of_fdt.h>
20 #include <linux/of_reserved_mem.h>
21 #include <linux/highmem.h>
22 #include <linux/gfp.h>
23 #include <linux/memblock.h>
24 #include <linux/dma-contiguous.h>
25 #include <linux/sizes.h>
26 
27 #include <asm/mach-types.h>
28 #include <asm/memblock.h>
29 #include <asm/prom.h>
30 #include <asm/sections.h>
31 #include <asm/setup.h>
32 #include <asm/tlb.h>
33 #include <asm/fixmap.h>
34 
35 #include <asm/mach/arch.h>
36 #include <asm/mach/map.h>
37 
38 #include "mm.h"
39 
40 static phys_addr_t phys_initrd_start __initdata = 0;
41 static unsigned long phys_initrd_size __initdata = 0;
42 
43 static int __init early_initrd(char *p)
44 {
45 	phys_addr_t start;
46 	unsigned long size;
47 	char *endp;
48 
49 	start = memparse(p, &endp);
50 	if (*endp == ',') {
51 		size = memparse(endp + 1, NULL);
52 
53 		phys_initrd_start = start;
54 		phys_initrd_size = size;
55 	}
56 	return 0;
57 }
58 early_param("initrd", early_initrd);
59 
60 static int __init parse_tag_initrd(const struct tag *tag)
61 {
62 	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
63 		"please update your bootloader.\n");
64 	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
65 	phys_initrd_size = tag->u.initrd.size;
66 	return 0;
67 }
68 
69 __tagtable(ATAG_INITRD, parse_tag_initrd);
70 
71 static int __init parse_tag_initrd2(const struct tag *tag)
72 {
73 	phys_initrd_start = tag->u.initrd.start;
74 	phys_initrd_size = tag->u.initrd.size;
75 	return 0;
76 }
77 
78 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
79 
80 #if defined(CONFIG_OF_FLATTREE) && defined(CONFIG_BLK_DEV_INITRD)
81 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
82 {
83 	initrd_start = (unsigned long)__va(start);
84 	initrd_end = (unsigned long)__va(end);
85 }
86 #endif /* CONFIG_OF_FLATTREE */
87 
88 /*
89  * This keeps memory configuration data used by a couple memory
90  * initialization functions, as well as show_mem() for the skipping
91  * of holes in the memory map.  It is populated by arm_add_memory().
92  */
93 struct meminfo meminfo;
94 
95 void show_mem(unsigned int filter)
96 {
97 	int free = 0, total = 0, reserved = 0;
98 	int shared = 0, cached = 0, slab = 0, i;
99 	struct meminfo * mi = &meminfo;
100 
101 	printk("Mem-info:\n");
102 	show_free_areas(filter);
103 
104 	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
105 		return;
106 
107 	for_each_bank (i, mi) {
108 		struct membank *bank = &mi->bank[i];
109 		unsigned int pfn1, pfn2;
110 		struct page *page, *end;
111 
112 		pfn1 = bank_pfn_start(bank);
113 		pfn2 = bank_pfn_end(bank);
114 
115 		page = pfn_to_page(pfn1);
116 		end  = pfn_to_page(pfn2 - 1) + 1;
117 
118 		do {
119 			total++;
120 			if (PageReserved(page))
121 				reserved++;
122 			else if (PageSwapCache(page))
123 				cached++;
124 			else if (PageSlab(page))
125 				slab++;
126 			else if (!page_count(page))
127 				free++;
128 			else
129 				shared += page_count(page) - 1;
130 			page++;
131 		} while (page < end);
132 	}
133 
134 	printk("%d pages of RAM\n", total);
135 	printk("%d free pages\n", free);
136 	printk("%d reserved pages\n", reserved);
137 	printk("%d slab pages\n", slab);
138 	printk("%d pages shared\n", shared);
139 	printk("%d pages swap cached\n", cached);
140 }
141 
142 static void __init find_limits(unsigned long *min, unsigned long *max_low,
143 			       unsigned long *max_high)
144 {
145 	struct meminfo *mi = &meminfo;
146 	int i;
147 
148 	/* This assumes the meminfo array is properly sorted */
149 	*min = bank_pfn_start(&mi->bank[0]);
150 	for_each_bank (i, mi)
151 		if (mi->bank[i].highmem)
152 				break;
153 	*max_low = bank_pfn_end(&mi->bank[i - 1]);
154 	*max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
155 }
156 
157 static void __init arm_bootmem_init(unsigned long start_pfn,
158 	unsigned long end_pfn)
159 {
160 	struct memblock_region *reg;
161 	unsigned int boot_pages;
162 	phys_addr_t bitmap;
163 	pg_data_t *pgdat;
164 
165 	/*
166 	 * Allocate the bootmem bitmap page.  This must be in a region
167 	 * of memory which has already been mapped.
168 	 */
169 	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
170 	bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
171 				__pfn_to_phys(end_pfn));
172 
173 	/*
174 	 * Initialise the bootmem allocator, handing the
175 	 * memory banks over to bootmem.
176 	 */
177 	node_set_online(0);
178 	pgdat = NODE_DATA(0);
179 	init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
180 
181 	/* Free the lowmem regions from memblock into bootmem. */
182 	for_each_memblock(memory, reg) {
183 		unsigned long start = memblock_region_memory_base_pfn(reg);
184 		unsigned long end = memblock_region_memory_end_pfn(reg);
185 
186 		if (end >= end_pfn)
187 			end = end_pfn;
188 		if (start >= end)
189 			break;
190 
191 		free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
192 	}
193 
194 	/* Reserve the lowmem memblock reserved regions in bootmem. */
195 	for_each_memblock(reserved, reg) {
196 		unsigned long start = memblock_region_reserved_base_pfn(reg);
197 		unsigned long end = memblock_region_reserved_end_pfn(reg);
198 
199 		if (end >= end_pfn)
200 			end = end_pfn;
201 		if (start >= end)
202 			break;
203 
204 		reserve_bootmem(__pfn_to_phys(start),
205 			        (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
206 	}
207 }
208 
209 #ifdef CONFIG_ZONE_DMA
210 
211 phys_addr_t arm_dma_zone_size __read_mostly;
212 EXPORT_SYMBOL(arm_dma_zone_size);
213 
214 /*
215  * The DMA mask corresponding to the maximum bus address allocatable
216  * using GFP_DMA.  The default here places no restriction on DMA
217  * allocations.  This must be the smallest DMA mask in the system,
218  * so a successful GFP_DMA allocation will always satisfy this.
219  */
220 phys_addr_t arm_dma_limit;
221 
222 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
223 	unsigned long dma_size)
224 {
225 	if (size[0] <= dma_size)
226 		return;
227 
228 	size[ZONE_NORMAL] = size[0] - dma_size;
229 	size[ZONE_DMA] = dma_size;
230 	hole[ZONE_NORMAL] = hole[0];
231 	hole[ZONE_DMA] = 0;
232 }
233 #endif
234 
235 void __init setup_dma_zone(const struct machine_desc *mdesc)
236 {
237 #ifdef CONFIG_ZONE_DMA
238 	if (mdesc->dma_zone_size) {
239 		arm_dma_zone_size = mdesc->dma_zone_size;
240 		arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
241 	} else
242 		arm_dma_limit = 0xffffffff;
243 #endif
244 }
245 
246 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
247 	unsigned long max_high)
248 {
249 	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
250 	struct memblock_region *reg;
251 
252 	/*
253 	 * initialise the zones.
254 	 */
255 	memset(zone_size, 0, sizeof(zone_size));
256 
257 	/*
258 	 * The memory size has already been determined.  If we need
259 	 * to do anything fancy with the allocation of this memory
260 	 * to the zones, now is the time to do it.
261 	 */
262 	zone_size[0] = max_low - min;
263 #ifdef CONFIG_HIGHMEM
264 	zone_size[ZONE_HIGHMEM] = max_high - max_low;
265 #endif
266 
267 	/*
268 	 * Calculate the size of the holes.
269 	 *  holes = node_size - sum(bank_sizes)
270 	 */
271 	memcpy(zhole_size, zone_size, sizeof(zhole_size));
272 	for_each_memblock(memory, reg) {
273 		unsigned long start = memblock_region_memory_base_pfn(reg);
274 		unsigned long end = memblock_region_memory_end_pfn(reg);
275 
276 		if (start < max_low) {
277 			unsigned long low_end = min(end, max_low);
278 			zhole_size[0] -= low_end - start;
279 		}
280 #ifdef CONFIG_HIGHMEM
281 		if (end > max_low) {
282 			unsigned long high_start = max(start, max_low);
283 			zhole_size[ZONE_HIGHMEM] -= end - high_start;
284 		}
285 #endif
286 	}
287 
288 #ifdef CONFIG_ZONE_DMA
289 	/*
290 	 * Adjust the sizes according to any special requirements for
291 	 * this machine type.
292 	 */
293 	if (arm_dma_zone_size)
294 		arm_adjust_dma_zone(zone_size, zhole_size,
295 			arm_dma_zone_size >> PAGE_SHIFT);
296 #endif
297 
298 	free_area_init_node(0, zone_size, min, zhole_size);
299 }
300 
301 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
302 int pfn_valid(unsigned long pfn)
303 {
304 	return memblock_is_memory(__pfn_to_phys(pfn));
305 }
306 EXPORT_SYMBOL(pfn_valid);
307 #endif
308 
309 #ifndef CONFIG_SPARSEMEM
310 static void __init arm_memory_present(void)
311 {
312 }
313 #else
314 static void __init arm_memory_present(void)
315 {
316 	struct memblock_region *reg;
317 
318 	for_each_memblock(memory, reg)
319 		memory_present(0, memblock_region_memory_base_pfn(reg),
320 			       memblock_region_memory_end_pfn(reg));
321 }
322 #endif
323 
324 static bool arm_memblock_steal_permitted = true;
325 
326 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
327 {
328 	phys_addr_t phys;
329 
330 	BUG_ON(!arm_memblock_steal_permitted);
331 
332 	phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
333 	memblock_free(phys, size);
334 	memblock_remove(phys, size);
335 
336 	return phys;
337 }
338 
339 void __init arm_memblock_init(struct meminfo *mi,
340 	const struct machine_desc *mdesc)
341 {
342 	int i;
343 
344 	for (i = 0; i < mi->nr_banks; i++)
345 		memblock_add(mi->bank[i].start, mi->bank[i].size);
346 
347 	/* Register the kernel text, kernel data and initrd with memblock. */
348 #ifdef CONFIG_XIP_KERNEL
349 	memblock_reserve(__pa(_sdata), _end - _sdata);
350 #else
351 	memblock_reserve(__pa(_stext), _end - _stext);
352 #endif
353 #ifdef CONFIG_BLK_DEV_INITRD
354 	/* FDT scan will populate initrd_start */
355 	if (initrd_start) {
356 		phys_initrd_start = __virt_to_phys(initrd_start);
357 		phys_initrd_size = initrd_end - initrd_start;
358 	}
359 	if (phys_initrd_size &&
360 	    !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
361 		pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
362 		       (u64)phys_initrd_start, phys_initrd_size);
363 		phys_initrd_start = phys_initrd_size = 0;
364 	}
365 	if (phys_initrd_size &&
366 	    memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
367 		pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
368 		       (u64)phys_initrd_start, phys_initrd_size);
369 		phys_initrd_start = phys_initrd_size = 0;
370 	}
371 	if (phys_initrd_size) {
372 		memblock_reserve(phys_initrd_start, phys_initrd_size);
373 
374 		/* Now convert initrd to virtual addresses */
375 		initrd_start = __phys_to_virt(phys_initrd_start);
376 		initrd_end = initrd_start + phys_initrd_size;
377 	}
378 #endif
379 
380 	arm_mm_memblock_reserve();
381 	arm_dt_memblock_reserve();
382 
383 	/* reserve any platform specific memblock areas */
384 	if (mdesc->reserve)
385 		mdesc->reserve();
386 
387 	early_init_dt_scan_reserved_mem();
388 
389 	/*
390 	 * reserve memory for DMA contigouos allocations,
391 	 * must come from DMA area inside low memory
392 	 */
393 	dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
394 
395 	arm_memblock_steal_permitted = false;
396 	memblock_allow_resize();
397 	memblock_dump_all();
398 }
399 
400 void __init bootmem_init(void)
401 {
402 	unsigned long min, max_low, max_high;
403 
404 	max_low = max_high = 0;
405 
406 	find_limits(&min, &max_low, &max_high);
407 
408 	arm_bootmem_init(min, max_low);
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();
415 
416 	/*
417 	 * sparse_init() needs the bootmem allocator up and running.
418 	 */
419 	sparse_init();
420 
421 	/*
422 	 * Now free the memory - free_area_init_node needs
423 	 * the sparse mem_map arrays initialized by sparse_init()
424 	 * for memmap_init_zone(), otherwise all PFNs are invalid.
425 	 */
426 	arm_bootmem_free(min, max_low, max_high);
427 
428 	/*
429 	 * This doesn't seem to be used by the Linux memory manager any
430 	 * more, but is used by ll_rw_block.  If we can get rid of it, we
431 	 * also get rid of some of the stuff above as well.
432 	 *
433 	 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
434 	 * the system, not the maximum PFN.
435 	 */
436 	max_low_pfn = max_low - PHYS_PFN_OFFSET;
437 	max_pfn = max_high - PHYS_PFN_OFFSET;
438 }
439 
440 /*
441  * Poison init memory with an undefined instruction (ARM) or a branch to an
442  * undefined instruction (Thumb).
443  */
444 static inline void poison_init_mem(void *s, size_t count)
445 {
446 	u32 *p = (u32 *)s;
447 	for (; count != 0; count -= 4)
448 		*p++ = 0xe7fddef0;
449 }
450 
451 static inline void
452 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
453 {
454 	struct page *start_pg, *end_pg;
455 	phys_addr_t pg, pgend;
456 
457 	/*
458 	 * Convert start_pfn/end_pfn to a struct page pointer.
459 	 */
460 	start_pg = pfn_to_page(start_pfn - 1) + 1;
461 	end_pg = pfn_to_page(end_pfn - 1) + 1;
462 
463 	/*
464 	 * Convert to physical addresses, and
465 	 * round start upwards and end downwards.
466 	 */
467 	pg = PAGE_ALIGN(__pa(start_pg));
468 	pgend = __pa(end_pg) & PAGE_MASK;
469 
470 	/*
471 	 * If there are free pages between these,
472 	 * free the section of the memmap array.
473 	 */
474 	if (pg < pgend)
475 		free_bootmem(pg, pgend - pg);
476 }
477 
478 /*
479  * The mem_map array can get very big.  Free the unused area of the memory map.
480  */
481 static void __init free_unused_memmap(struct meminfo *mi)
482 {
483 	unsigned long bank_start, prev_bank_end = 0;
484 	unsigned int i;
485 
486 	/*
487 	 * This relies on each bank being in address order.
488 	 * The banks are sorted previously in bootmem_init().
489 	 */
490 	for_each_bank(i, mi) {
491 		struct membank *bank = &mi->bank[i];
492 
493 		bank_start = bank_pfn_start(bank);
494 
495 #ifdef CONFIG_SPARSEMEM
496 		/*
497 		 * Take care not to free memmap entries that don't exist
498 		 * due to SPARSEMEM sections which aren't present.
499 		 */
500 		bank_start = min(bank_start,
501 				 ALIGN(prev_bank_end, PAGES_PER_SECTION));
502 #else
503 		/*
504 		 * Align down here since the VM subsystem insists that the
505 		 * memmap entries are valid from the bank start aligned to
506 		 * MAX_ORDER_NR_PAGES.
507 		 */
508 		bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
509 #endif
510 		/*
511 		 * If we had a previous bank, and there is a space
512 		 * between the current bank and the previous, free it.
513 		 */
514 		if (prev_bank_end && prev_bank_end < bank_start)
515 			free_memmap(prev_bank_end, bank_start);
516 
517 		/*
518 		 * Align up here since the VM subsystem insists that the
519 		 * memmap entries are valid from the bank end aligned to
520 		 * MAX_ORDER_NR_PAGES.
521 		 */
522 		prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
523 	}
524 
525 #ifdef CONFIG_SPARSEMEM
526 	if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
527 		free_memmap(prev_bank_end,
528 			    ALIGN(prev_bank_end, PAGES_PER_SECTION));
529 #endif
530 }
531 
532 #ifdef CONFIG_HIGHMEM
533 static inline void free_area_high(unsigned long pfn, unsigned long end)
534 {
535 	for (; pfn < end; pfn++)
536 		free_highmem_page(pfn_to_page(pfn));
537 }
538 #endif
539 
540 static void __init free_highpages(void)
541 {
542 #ifdef CONFIG_HIGHMEM
543 	unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
544 	struct memblock_region *mem, *res;
545 
546 	/* set highmem page free */
547 	for_each_memblock(memory, mem) {
548 		unsigned long start = memblock_region_memory_base_pfn(mem);
549 		unsigned long end = memblock_region_memory_end_pfn(mem);
550 
551 		/* Ignore complete lowmem entries */
552 		if (end <= max_low)
553 			continue;
554 
555 		/* Truncate partial highmem entries */
556 		if (start < max_low)
557 			start = max_low;
558 
559 		/* Find and exclude any reserved regions */
560 		for_each_memblock(reserved, res) {
561 			unsigned long res_start, res_end;
562 
563 			res_start = memblock_region_reserved_base_pfn(res);
564 			res_end = memblock_region_reserved_end_pfn(res);
565 
566 			if (res_end < start)
567 				continue;
568 			if (res_start < start)
569 				res_start = start;
570 			if (res_start > end)
571 				res_start = end;
572 			if (res_end > end)
573 				res_end = end;
574 			if (res_start != start)
575 				free_area_high(start, res_start);
576 			start = res_end;
577 			if (start == end)
578 				break;
579 		}
580 
581 		/* And now free anything which remains */
582 		if (start < end)
583 			free_area_high(start, end);
584 	}
585 #endif
586 }
587 
588 /*
589  * mem_init() marks the free areas in the mem_map and tells us how much
590  * memory is free.  This is done after various parts of the system have
591  * claimed their memory after the kernel image.
592  */
593 void __init mem_init(void)
594 {
595 #ifdef CONFIG_HAVE_TCM
596 	/* These pointers are filled in on TCM detection */
597 	extern u32 dtcm_end;
598 	extern u32 itcm_end;
599 #endif
600 
601 	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
602 
603 	/* this will put all unused low memory onto the freelists */
604 	free_unused_memmap(&meminfo);
605 	free_all_bootmem();
606 
607 #ifdef CONFIG_SA1111
608 	/* now that our DMA memory is actually so designated, we can free it */
609 	free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
610 #endif
611 
612 	free_highpages();
613 
614 	mem_init_print_info(NULL);
615 
616 #define MLK(b, t) b, t, ((t) - (b)) >> 10
617 #define MLM(b, t) b, t, ((t) - (b)) >> 20
618 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
619 
620 	printk(KERN_NOTICE "Virtual kernel memory layout:\n"
621 			"    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
622 #ifdef CONFIG_HAVE_TCM
623 			"    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
624 			"    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
625 #endif
626 			"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
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 #ifdef CONFIG_MODULES
633 			"    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
634 #endif
635 			"      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
636 			"      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
637 			"      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
638 			"       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
639 
640 			MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
641 				(PAGE_SIZE)),
642 #ifdef CONFIG_HAVE_TCM
643 			MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
644 			MLK(ITCM_OFFSET, (unsigned long) itcm_end),
645 #endif
646 			MLK(FIXADDR_START, FIXADDR_TOP),
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 #ifdef CONFIG_MODULES
654 			MLM(MODULES_VADDR, MODULES_END),
655 #endif
656 
657 			MLK_ROUNDUP(_text, _etext),
658 			MLK_ROUNDUP(__init_begin, __init_end),
659 			MLK_ROUNDUP(_sdata, _edata),
660 			MLK_ROUNDUP(__bss_start, __bss_stop));
661 
662 #undef MLK
663 #undef MLM
664 #undef MLK_ROUNDUP
665 
666 	/*
667 	 * Check boundaries twice: Some fundamental inconsistencies can
668 	 * be detected at build time already.
669 	 */
670 #ifdef CONFIG_MMU
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 && get_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 	poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
697 	free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
698 #endif
699 
700 	poison_init_mem(__init_begin, __init_end - __init_begin);
701 	if (!machine_is_integrator() && !machine_is_cintegrator())
702 		free_initmem_default(-1);
703 }
704 
705 #ifdef CONFIG_BLK_DEV_INITRD
706 
707 static int keep_initrd;
708 
709 void free_initrd_mem(unsigned long start, unsigned long end)
710 {
711 	if (!keep_initrd) {
712 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
713 		free_reserved_area((void *)start, (void *)end, -1, "initrd");
714 	}
715 }
716 
717 static int __init keepinitrd_setup(char *__unused)
718 {
719 	keep_initrd = 1;
720 	return 1;
721 }
722 
723 __setup("keepinitrd", keepinitrd_setup);
724 #endif
725