[deliverable/linux.git] / arch / xtensa / mm / init.c

/*
 * arch/xtensa/mm/init.c
 *
 * Derived from MIPS, PPC.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 * Copyright (C) 2014 Cadence Design Systems Inc.
 *
 * Chris Zankel	<chris@zankel.net>
 * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
 * Marc Gauthier
 * Kevin Chea
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/mm.h>

#include <asm/bootparam.h>
#include <asm/page.h>
#include <asm/sections.h>
#include <asm/sysmem.h>

struct sysmem_info sysmem __initdata;

static void __init sysmem_dump(void)
{
	unsigned i;

	pr_debug("Sysmem:\n");
	for (i = 0; i < sysmem.nr_banks; ++i)
		pr_debug("  0x%08lx - 0x%08lx (%ldK)\n",
			 sysmem.bank[i].start, sysmem.bank[i].end,
			 (sysmem.bank[i].end - sysmem.bank[i].start) >> 10);
}

/*
 * Find bank with maximal .start such that bank.start <= start
 */
static inline struct meminfo * __init find_bank(unsigned long start)
{
	unsigned i;
	struct meminfo *it = NULL;

	for (i = 0; i < sysmem.nr_banks; ++i)
		if (sysmem.bank[i].start <= start)
			it = sysmem.bank + i;
		else
			break;
	return it;
}

/*
 * Move all memory banks starting at 'from' to a new place at 'to',
 * adjust nr_banks accordingly.
 * Both 'from' and 'to' must be inside the sysmem.bank.
 *
 * Returns: 0 (success), -ENOMEM (not enough space in the sysmem.bank).
 */
static int __init move_banks(struct meminfo *to, struct meminfo *from)
{
	unsigned n = sysmem.nr_banks - (from - sysmem.bank);

	if (to > from && to - from + sysmem.nr_banks > SYSMEM_BANKS_MAX)
		return -ENOMEM;
	if (to != from)
		memmove(to, from, n * sizeof(struct meminfo));
	sysmem.nr_banks += to - from;
	return 0;
}

/*
 * Add new bank to sysmem. Resulting sysmem is the union of bytes of the
 * original sysmem and the new bank.
 *
 * Returns: 0 (success), < 0 (error)
 */
int __init add_sysmem_bank(unsigned long start, unsigned long end)
{
	unsigned i;
	struct meminfo *it = NULL;
	unsigned long sz;
	unsigned long bank_sz = 0;

	if (start == end ||
	    (start < end) != (PAGE_ALIGN(start) < (end & PAGE_MASK))) {
		pr_warn("Ignoring small memory bank 0x%08lx size: %ld bytes\n",
			start, end - start);
		return -EINVAL;
	}

	start = PAGE_ALIGN(start);
	end &= PAGE_MASK;
	sz = end - start;

	it = find_bank(start);

	if (it)
		bank_sz = it->end - it->start;

	if (it && bank_sz >= start - it->start) {
		if (end - it->start > bank_sz)
			it->end = end;
		else
			return 0;
	} else {
		if (!it)
			it = sysmem.bank;
		else
			++it;

		if (it - sysmem.bank < sysmem.nr_banks &&
		    it->start - start <= sz) {
			it->start = start;
			if (it->end - it->start < sz)
				it->end = end;
			else
				return 0;
		} else {
			if (move_banks(it + 1, it) < 0) {
				pr_warn("Ignoring memory bank 0x%08lx size %ld bytes\n",
					start, end - start);
				return -EINVAL;
			}
			it->start = start;
			it->end = end;
			return 0;
		}
	}
	sz = it->end - it->start;
	for (i = it + 1 - sysmem.bank; i < sysmem.nr_banks; ++i)
		if (sysmem.bank[i].start - it->start <= sz) {
			if (sz < sysmem.bank[i].end - it->start)
				it->end = sysmem.bank[i].end;
		} else {
			break;
		}

	move_banks(it + 1, sysmem.bank + i);
	return 0;
}

/*
 * mem_reserve(start, end, must_exist)
 *
 * Reserve some memory from the memory pool.
 * If must_exist is set and a part of the region being reserved does not exist
 * memory map is not altered.
 *
 * Parameters:
 *  start	Start of region,
 *  end		End of region,
 *  must_exist	Must exist in memory pool.
 *
 * Returns:
 *  0 (success)
 *  < 0 (error)
 */

int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
{
	struct meminfo *it;
	struct meminfo *rm = NULL;
	unsigned long sz;
	unsigned long bank_sz = 0;

	start = start & PAGE_MASK;
	end = PAGE_ALIGN(end);
	sz = end - start;
	if (!sz)
		return -EINVAL;

	it = find_bank(start);

	if (it)
		bank_sz = it->end - it->start;

	if ((!it || end - it->start > bank_sz) && must_exist) {
		pr_warn("mem_reserve: [0x%0lx, 0x%0lx) not in any region!\n",
			start, end);
		return -EINVAL;
	}

	if (it && start - it->start < bank_sz) {
		if (start == it->start) {
			if (end - it->start < bank_sz) {
				it->start = end;
				return 0;
			} else {
				rm = it;
			}
		} else {
			it->end = start;
			if (end - it->start < bank_sz)
				return add_sysmem_bank(end,
						       it->start + bank_sz);
			++it;
		}
	}

	if (!it)
		it = sysmem.bank;

	for (; it < sysmem.bank + sysmem.nr_banks; ++it) {
		if (it->end - start <= sz) {
			if (!rm)
				rm = it;
		} else {
			if (it->start - start < sz)
				it->start = end;
			break;
		}
	}

	if (rm)
		move_banks(rm, it);

	return 0;
}


/*
 * Initialize the bootmem system and give it all low memory we have available.
 */

void __init bootmem_init(void)
{
	unsigned long pfn;
	unsigned long bootmap_start, bootmap_size;
	int i;

	sysmem_dump();
	max_low_pfn = max_pfn = 0;
	min_low_pfn = ~0;

	for (i=0; i < sysmem.nr_banks; i++) {
		pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
		if (pfn < min_low_pfn)
			min_low_pfn = pfn;
		pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
		if (pfn > max_pfn)
			max_pfn = pfn;
	}

	if (min_low_pfn > max_pfn)
		panic("No memory found!\n");

	max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
		max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;

	/* Find an area to use for the bootmem bitmap. */

	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
	bootmap_size <<= PAGE_SHIFT;
	bootmap_start = ~0;

	for (i=0; i<sysmem.nr_banks; i++)
		if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
			bootmap_start = sysmem.bank[i].start;
			break;
		}

	if (bootmap_start == ~0UL)
		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);

	/* Reserve the bootmem bitmap area */

	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 bootmap_start >> PAGE_SHIFT,
					 min_low_pfn,
					 max_low_pfn);

	/* Add all remaining memory pieces into the bootmem map */

	for (i = 0; i < sysmem.nr_banks; i++) {
		if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) {
			unsigned long end = min(max_low_pfn << PAGE_SHIFT,
						sysmem.bank[i].end);
			free_bootmem(sysmem.bank[i].start,
				     end - sysmem.bank[i].start);
		}
	}

}


void __init zones_init(void)
{
	/* All pages are DMA-able, so we put them all in the DMA zone. */
	unsigned long zones_size[MAX_NR_ZONES] = {
		[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
#ifdef CONFIG_HIGHMEM
		[ZONE_HIGHMEM] = max_pfn - max_low_pfn,
#endif
	};
	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
}

/*
 * Initialize memory pages.
 */

void __init mem_init(void)
{
#ifdef CONFIG_HIGHMEM
	unsigned long tmp;

	reset_all_zones_managed_pages();
	for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
		free_highmem_page(pfn_to_page(tmp));
#endif

	max_mapnr = max_pfn - ARCH_PFN_OFFSET;
	high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);

	free_all_bootmem();

	mem_init_print_info(NULL);
	pr_info("virtual kernel memory layout:\n"
#ifdef CONFIG_HIGHMEM
		"    pkmap   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
		"    fixmap  : 0x%08lx - 0x%08lx  (%5lu kB)\n"
#endif
		"    vmalloc : 0x%08x - 0x%08x  (%5u MB)\n"
		"    lowmem  : 0x%08x - 0x%08lx  (%5lu MB)\n",
#ifdef CONFIG_HIGHMEM
		PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
		(LAST_PKMAP*PAGE_SIZE) >> 10,
		FIXADDR_START, FIXADDR_TOP,
		(FIXADDR_TOP - FIXADDR_START) >> 10,
#endif
		VMALLOC_START, VMALLOC_END,
		(VMALLOC_END - VMALLOC_START) >> 20,
		PAGE_OFFSET, PAGE_OFFSET +
		(max_low_pfn - min_low_pfn) * PAGE_SIZE,
		((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20);
}

#ifdef CONFIG_BLK_DEV_INITRD
extern int initrd_is_mapped;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (initrd_is_mapped)
		free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

void free_initmem(void)
{
	free_initmem_default(-1);
}

static void __init parse_memmap_one(char *p)
{
	char *oldp;
	unsigned long start_at, mem_size;

	if (!p)
		return;

	oldp = p;
	mem_size = memparse(p, &p);
	if (p == oldp)
		return;

	switch (*p) {
	case '@':
		start_at = memparse(p + 1, &p);
		add_sysmem_bank(start_at, start_at + mem_size);
		break;

	case '$':
		start_at = memparse(p + 1, &p);
		mem_reserve(start_at, start_at + mem_size, 0);
		break;

	case 0:
		mem_reserve(mem_size, 0, 0);
		break;

	default:
		pr_warn("Unrecognized memmap syntax: %s\n", p);
		break;
	}
}

static int __init parse_memmap_opt(char *str)
{
	while (str) {
		char *k = strchr(str, ',');

		if (k)
			*k++ = 0;

		parse_memmap_one(str);
		str = k;
	}

	return 0;
}
early_param("memmap", parse_memmap_opt);
Commit	Line	Data
3f65ce4d CZ	1	/*
	2	* arch/xtensa/mm/init.c
	3	*
	4	* Derived from MIPS, PPC.
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*
	10	* Copyright (C) 2001 - 2005 Tensilica Inc.
9d4b52df	11	* Copyright (C) 2014 Cadence Design Systems Inc.
3f65ce4d CZ	12	*
	13	* Chris Zankel <chris@zankel.net>
	14	* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
	15	* Marc Gauthier
	16	* Kevin Chea
	17	*/
	18
3f65ce4d CZ	19	#include <linux/kernel.h>
3f65ce4d CZ	20	#include <linux/errno.h>
3f65ce4d	21	#include <linux/bootmem.h>
5a0e3ad6	22	#include <linux/gfp.h>
65559100	23	#include <linux/highmem.h>
3f65ce4d	24	#include <linux/swap.h>
6656920b CZ	25	#include <linux/mman.h>
	26	#include <linux/nodemask.h>
	27	#include <linux/mm.h>
3f65ce4d	28
3f65ce4d	29	#include <asm/bootparam.h>
3f65ce4d	30	#include <asm/page.h>
f022d0fa	31	#include <asm/sections.h>
9ba067f9 MF	32	#include <asm/sysmem.h>
	33
	34	struct sysmem_info sysmem __initdata;
	35
8585b316 MF	36	static void __init sysmem_dump(void)
	37	{
	38	unsigned i;
	39
	40	pr_debug("Sysmem:\n");
	41	for (i = 0; i < sysmem.nr_banks; ++i)
	42	pr_debug(" 0x%08lx - 0x%08lx (%ldK)\n",
	43	sysmem.bank[i].start, sysmem.bank[i].end,
	44	(sysmem.bank[i].end - sysmem.bank[i].start) >> 10);
	45	}
	46
9d4b52df MF	47	/*
	48	* Find bank with maximal .start such that bank.start <= start
	49	*/
	50	static inline struct meminfo * __init find_bank(unsigned long start)
	51	{
	52	unsigned i;
	53	struct meminfo *it = NULL;
	54
	55	for (i = 0; i < sysmem.nr_banks; ++i)
	56	if (sysmem.bank[i].start <= start)
	57	it = sysmem.bank + i;
	58	else
	59	break;
	60	return it;
	61	}
	62
	63	/*
	64	* Move all memory banks starting at 'from' to a new place at 'to',
	65	* adjust nr_banks accordingly.
	66	* Both 'from' and 'to' must be inside the sysmem.bank.
	67	*
	68	* Returns: 0 (success), -ENOMEM (not enough space in the sysmem.bank).
	69	*/
	70	static int __init move_banks(struct meminfo to, struct meminfo from)
	71	{
	72	unsigned n = sysmem.nr_banks - (from - sysmem.bank);
	73
	74	if (to > from && to - from + sysmem.nr_banks > SYSMEM_BANKS_MAX)
	75	return -ENOMEM;
	76	if (to != from)
	77	memmove(to, from, n * sizeof(struct meminfo));
	78	sysmem.nr_banks += to - from;
	79	return 0;
	80	}
	81
	82	/*
	83	* Add new bank to sysmem. Resulting sysmem is the union of bytes of the
	84	* original sysmem and the new bank.
	85	*
	86	* Returns: 0 (success), < 0 (error)
	87	*/
9ba067f9 MF	88	int __init add_sysmem_bank(unsigned long start, unsigned long end)
9ba067f9 MF	89	{
9d4b52df MF	90	unsigned i;
	91	struct meminfo *it = NULL;
	92	unsigned long sz;
	93	unsigned long bank_sz = 0;
	94
	95	if (start == end \|\|
	96	(start < end) != (PAGE_ALIGN(start) < (end & PAGE_MASK))) {
	97	pr_warn("Ignoring small memory bank 0x%08lx size: %ld bytes\n",
9ba067f9 MF	98	start, end - start);
	99	return -EINVAL;
	100	}
9ba067f9	101
9d4b52df MF	102	start = PAGE_ALIGN(start);
	103	end &= PAGE_MASK;
	104	sz = end - start;
	105
	106	it = find_bank(start);
	107
	108	if (it)
	109	bank_sz = it->end - it->start;
	110
	111	if (it && bank_sz >= start - it->start) {
	112	if (end - it->start > bank_sz)
	113	it->end = end;
	114	else
	115	return 0;
	116	} else {
	117	if (!it)
	118	it = sysmem.bank;
	119	else
	120	++it;
	121
	122	if (it - sysmem.bank < sysmem.nr_banks &&
	123	it->start - start <= sz) {
	124	it->start = start;
	125	if (it->end - it->start < sz)
	126	it->end = end;
	127	else
	128	return 0;
	129	} else {
	130	if (move_banks(it + 1, it) < 0) {
	131	pr_warn("Ignoring memory bank 0x%08lx size %ld bytes\n",
	132	start, end - start);
	133	return -EINVAL;
	134	}
	135	it->start = start;
	136	it->end = end;
	137	return 0;
	138	}
	139	}
	140	sz = it->end - it->start;
	141	for (i = it + 1 - sysmem.bank; i < sysmem.nr_banks; ++i)
	142	if (sysmem.bank[i].start - it->start <= sz) {
	143	if (sz < sysmem.bank[i].end - it->start)
	144	it->end = sysmem.bank[i].end;
	145	} else {
	146	break;
	147	}
	148
	149	move_banks(it + 1, sysmem.bank + i);
9ba067f9 MF	150	return 0;
9ba067f9 MF	151	}
3f65ce4d CZ	152
	153	/*
	154	* mem_reserve(start, end, must_exist)
	155	*
	156	* Reserve some memory from the memory pool.
62327918 MF	157	* If must_exist is set and a part of the region being reserved does not exist
62327918 MF	158	* memory map is not altered.
3f65ce4d CZ	159	*
	160	* Parameters:
	161	* start Start of region,
	162	* end End of region,
	163	* must_exist Must exist in memory pool.
	164	*
	165	* Returns:
62327918 MF	166	* 0 (success)
62327918 MF	167	* < 0 (error)
3f65ce4d CZ	168	*/
	169
	170	int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
	171	{
62327918 MF	172	struct meminfo *it;
	173	struct meminfo *rm = NULL;
	174	unsigned long sz;
	175	unsigned long bank_sz = 0;
3f65ce4d CZ	176
	177	start = start & PAGE_MASK;
	178	end = PAGE_ALIGN(end);
62327918 MF	179	sz = end - start;
	180	if (!sz)
	181	return -EINVAL;
3f65ce4d	182
62327918 MF	183	it = find_bank(start);
	184
	185	if (it)
	186	bank_sz = it->end - it->start;
3f65ce4d	187
62327918 MF	188	if ((!it \|\| end - it->start > bank_sz) && must_exist) {
	189	pr_warn("mem_reserve: [0x%0lx, 0x%0lx) not in any region!\n",
	190	start, end);
	191	return -EINVAL;
3f65ce4d CZ	192	}
3f65ce4d CZ	193
62327918 MF	194	if (it && start - it->start < bank_sz) {
	195	if (start == it->start) {
	196	if (end - it->start < bank_sz) {
	197	it->start = end;
	198	return 0;
	199	} else {
	200	rm = it;
	201	}
	202	} else {
	203	it->end = start;
	204	if (end - it->start < bank_sz)
	205	return add_sysmem_bank(end,
	206	it->start + bank_sz);
	207	++it;
3f65ce4d	208	}
62327918	209	}
c4c4594b	210
62327918 MF	211	if (!it)
62327918 MF	212	it = sysmem.bank;
c4c4594b	213
62327918 MF	214	for (; it < sysmem.bank + sysmem.nr_banks; ++it) {
	215	if (it->end - start <= sz) {
	216	if (!rm)
	217	rm = it;
	218	} else {
	219	if (it->start - start < sz)
	220	it->start = end;
	221	break;
	222	}
3f65ce4d	223	}
62327918 MF	224
	225	if (rm)
	226	move_banks(rm, it);
	227
	228	return 0;
3f65ce4d CZ	229	}
	230
	231
	232	/*
e9d6dca5	233	* Initialize the bootmem system and give it all low memory we have available.
3f65ce4d CZ	234	*/
	235
	236	void __init bootmem_init(void)
	237	{
	238	unsigned long pfn;
	239	unsigned long bootmap_start, bootmap_size;
	240	int i;
	241
8585b316	242	sysmem_dump();
3f65ce4d CZ	243	max_low_pfn = max_pfn = 0;
	244	min_low_pfn = ~0;
	245
	246	for (i=0; i < sysmem.nr_banks; i++) {
	247	pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
	248	if (pfn < min_low_pfn)
	249	min_low_pfn = pfn;
	250	pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
	251	if (pfn > max_pfn)
	252	max_pfn = pfn;
	253	}
	254
	255	if (min_low_pfn > max_pfn)
	256	panic("No memory found!\n");
	257
173d6681 CZ	258	max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
173d6681 CZ	259	max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;
3f65ce4d CZ	260
	261	/* Find an area to use for the bootmem bitmap. */
	262
264da9f7 JW	263	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
264da9f7 JW	264	bootmap_size <<= PAGE_SHIFT;
3f65ce4d CZ	265	bootmap_start = ~0;
	266
	267	for (i=0; i<sysmem.nr_banks; i++)
	268	if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
	269	bootmap_start = sysmem.bank[i].start;
	270	break;
	271	}
	272
	273	if (bootmap_start == ~0UL)
	274	panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
	275
	276	/* Reserve the bootmem bitmap area */
	277
	278	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
0bef42e5	279	bootmap_size = init_bootmem_node(NODE_DATA(0),
3f65ce4d	280	bootmap_start >> PAGE_SHIFT,
0bef42e5	281	min_low_pfn,
3f65ce4d CZ	282	max_low_pfn);
	283
	284	/* Add all remaining memory pieces into the bootmem map */
	285
e9d6dca5 MF	286	for (i = 0; i < sysmem.nr_banks; i++) {
	287	if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) {
	288	unsigned long end = min(max_low_pfn << PAGE_SHIFT,
	289	sysmem.bank[i].end);
	290	free_bootmem(sysmem.bank[i].start,
	291	end - sysmem.bank[i].start);
	292	}
	293	}
3f65ce4d CZ	294
	295	}
	296
	297
e5083a63	298	void __init zones_init(void)
3f65ce4d	299	{
3f65ce4d	300	/* All pages are DMA-able, so we put them all in the DMA zone. */
65559100 MF	301	unsigned long zones_size[MAX_NR_ZONES] = {
65559100 MF	302	[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
3f65ce4d	303	#ifdef CONFIG_HIGHMEM
65559100	304	[ZONE_HIGHMEM] = max_pfn - max_low_pfn,
3f65ce4d	305	#endif
65559100	306	};
c947a585	307	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
3f65ce4d CZ	308	}
3f65ce4d CZ	309
3f65ce4d CZ	310	/*
	311	* Initialize memory pages.
	312	*/
	313
	314	void __init mem_init(void)
	315	{
288a60cf	316	#ifdef CONFIG_HIGHMEM
65559100 MF	317	unsigned long tmp;
	318
	319	reset_all_zones_managed_pages();
	320	for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
	321	free_highmem_page(pfn_to_page(tmp));
3f65ce4d CZ	322	#endif
3f65ce4d CZ	323
65559100 MF	324	max_mapnr = max_pfn - ARCH_PFN_OFFSET;
	325	high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
	326
0c988534	327	free_all_bootmem();
3f65ce4d	328
808c2c37	329	mem_init_print_info(NULL);
65559100 MF	330	pr_info("virtual kernel memory layout:\n"
	331	#ifdef CONFIG_HIGHMEM
	332	" pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
	333	" fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
	334	#endif
	335	" vmalloc : 0x%08x - 0x%08x (%5u MB)\n"
	336	" lowmem : 0x%08x - 0x%08lx (%5lu MB)\n",
	337	#ifdef CONFIG_HIGHMEM
	338	PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
	339	(LAST_PKMAP*PAGE_SIZE) >> 10,
	340	FIXADDR_START, FIXADDR_TOP,
	341	(FIXADDR_TOP - FIXADDR_START) >> 10,
	342	#endif
	343	VMALLOC_START, VMALLOC_END,
	344	(VMALLOC_END - VMALLOC_START) >> 20,
	345	PAGE_OFFSET, PAGE_OFFSET +
	346	(max_low_pfn - min_low_pfn) * PAGE_SIZE,
	347	((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20);
3f65ce4d CZ	348	}
3f65ce4d CZ	349
3f65ce4d CZ	350	#ifdef CONFIG_BLK_DEV_INITRD
	351	extern int initrd_is_mapped;
	352
	353	void free_initrd_mem(unsigned long start, unsigned long end)
	354	{
7acb2c2e	355	if (initrd_is_mapped)
dbe67df4	356	free_reserved_area((void )start, (void )end, -1, "initrd");
3f65ce4d CZ	357	}
	358	#endif
	359
	360	void free_initmem(void)
	361	{
dbe67df4	362	free_initmem_default(-1);
3f65ce4d	363	}
06bd2824 MF	364
	365	static void __init parse_memmap_one(char *p)
	366	{
	367	char *oldp;
	368	unsigned long start_at, mem_size;
	369
	370	if (!p)
	371	return;
	372
	373	oldp = p;
	374	mem_size = memparse(p, &p);
	375	if (p == oldp)
	376	return;
	377
	378	switch (*p) {
	379	case '@':
	380	start_at = memparse(p + 1, &p);
	381	add_sysmem_bank(start_at, start_at + mem_size);
	382	break;
	383
	384	case '$':
	385	start_at = memparse(p + 1, &p);
	386	mem_reserve(start_at, start_at + mem_size, 0);
	387	break;
	388
	389	case 0:
	390	mem_reserve(mem_size, 0, 0);
	391	break;
	392
	393	default:
	394	pr_warn("Unrecognized memmap syntax: %s\n", p);
	395	break;
	396	}
	397	}
	398
	399	static int __init parse_memmap_opt(char *str)
	400	{
	401	while (str) {
	402	char *k = strchr(str, ',');
	403
	404	if (k)
	405	*k++ = 0;
	406
	407	parse_memmap_one(str);
	408	str = k;
	409	}
	410
	411	return 0;
	412	}
	413	early_param("memmap", parse_memmap_opt);