[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.
 *
 * 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/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>

/*
 * mem_reserve(start, end, must_exist)
 *
 * Reserve some memory from the memory pool.
 *
 * Parameters:
 *  start	Start of region,
 *  end		End of region,
 *  must_exist	Must exist in memory pool.
 *
 * Returns:
 *  0 (memory area couldn't be mapped)
 * -1 (success)
 */

int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
{
	int i;

	if (start == end)
		return 0;

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

	for (i = 0; i < sysmem.nr_banks; i++)
		if (start < sysmem.bank[i].end
		    && end >= sysmem.bank[i].start)
			break;

	if (i == sysmem.nr_banks) {
		if (must_exist)
			printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
				"not in any region!\n", start, end);
		return 0;
	}

	if (start > sysmem.bank[i].start) {
		if (end < sysmem.bank[i].end) {
			/* split entry */
			if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
				panic("meminfo overflow\n");
			sysmem.bank[sysmem.nr_banks].start = end;
			sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
			sysmem.nr_banks++;
		}
		sysmem.bank[i].end = start;
	} else {
		if (end < sysmem.bank[i].end)
			sysmem.bank[i].start = end;
		else {
			/* remove entry */
			sysmem.nr_banks--;
			sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
			sysmem.bank[i].end   = sysmem.bank[sysmem.nr_banks].end;
		}
	}
	return -1;
}


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

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

	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++)
		free_bootmem(sysmem.bank[i].start,
			     sysmem.bank[i].end - sysmem.bank[i].start);

}


void __init zones_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES];
	int i;

	/* All pages are DMA-able, so we put them all in the DMA zone. */

	zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
	for (i = 1; i < MAX_NR_ZONES; i++)
		zones_size[i] = 0;

#ifdef CONFIG_HIGHMEM
	zones_size[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)
{
	unsigned long codesize, reservedpages, datasize, initsize;
	unsigned long highmemsize, tmp, ram;

	max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	highmemsize = 0;

#ifdef CONFIG_HIGHMEM
#error HIGHGMEM not implemented in init.c
#endif

	totalram_pages += free_all_bootmem();

	reservedpages = ram = 0;
	for (tmp = 0; tmp < max_mapnr; tmp++) {
		ram++;
		if (PageReserved(mem_map+tmp))
			reservedpages++;
	}

	codesize =  (unsigned long) _etext - (unsigned long) _stext;
	datasize =  (unsigned long) _edata - (unsigned long) _sdata;
	initsize =  (unsigned long) __init_end - (unsigned long) __init_begin;

	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
	       "%ldk data, %ldk init %ldk highmem)\n",
	       nr_free_pages() << (PAGE_SHIFT-10),
	       ram << (PAGE_SHIFT-10),
	       codesize >> 10,
	       reservedpages << (PAGE_SHIFT-10),
	       datasize >> 10,
	       initsize >> 10,
	       highmemsize >> 10);
}

void
free_reserved_mem(void *start, void *end)
{
	for (; start < end; start += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(start));
		init_page_count(virt_to_page(start));
		free_page((unsigned long)start);
		totalram_pages++;
	}
}

#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_mem((void*)start, (void*)end);
		printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10);
	}
}
#endif

void free_initmem(void)
{
	free_reserved_mem(__init_begin, __init_end);
	printk("Freeing unused kernel memory: %zuk freed\n",
	       (__init_end - __init_begin) >> 10);
}
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.
	11	*
	12	* Chris Zankel <chris@zankel.net>
	13	* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
	14	* Marc Gauthier
	15	* Kevin Chea
	16	*/
	17
3f65ce4d CZ	18	#include <linux/kernel.h>
3f65ce4d CZ	19	#include <linux/errno.h>
3f65ce4d	20	#include <linux/bootmem.h>
5a0e3ad6	21	#include <linux/gfp.h>
3f65ce4d	22	#include <linux/swap.h>
6656920b CZ	23	#include <linux/mman.h>
	24	#include <linux/nodemask.h>
	25	#include <linux/mm.h>
3f65ce4d	26
3f65ce4d	27	#include <asm/bootparam.h>
3f65ce4d	28	#include <asm/page.h>
f022d0fa	29	#include <asm/sections.h>
3f65ce4d CZ	30
	31	/*
	32	* mem_reserve(start, end, must_exist)
	33	*
	34	* Reserve some memory from the memory pool.
	35	*
	36	* Parameters:
	37	* start Start of region,
	38	* end End of region,
	39	* must_exist Must exist in memory pool.
	40	*
	41	* Returns:
	42	* 0 (memory area couldn't be mapped)
	43	* -1 (success)
	44	*/
	45
	46	int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
	47	{
	48	int i;
	49
	50	if (start == end)
	51	return 0;
	52
	53	start = start & PAGE_MASK;
	54	end = PAGE_ALIGN(end);
	55
	56	for (i = 0; i < sysmem.nr_banks; i++)
	57	if (start < sysmem.bank[i].end
	58	&& end >= sysmem.bank[i].start)
	59	break;
	60
	61	if (i == sysmem.nr_banks) {
	62	if (must_exist)
	63	printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
	64	"not in any region!\n", start, end);
	65	return 0;
	66	}
	67
	68	if (start > sysmem.bank[i].start) {
	69	if (end < sysmem.bank[i].end) {
	70	/* split entry */
	71	if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
	72	panic("meminfo overflow\n");
	73	sysmem.bank[sysmem.nr_banks].start = end;
	74	sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
	75	sysmem.nr_banks++;
	76	}
	77	sysmem.bank[i].end = start;
	78	} else {
	79	if (end < sysmem.bank[i].end)
	80	sysmem.bank[i].start = end;
	81	else {
	82	/* remove entry */
	83	sysmem.nr_banks--;
	84	sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
	85	sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end;
	86	}
	87	}
	88	return -1;
	89	}
	90
	91
	92	/*
	93	* Initialize the bootmem system and give it all the memory we have available.
94	*/
95
96	void __init bootmem_init(void)
97	{
98	unsigned long pfn;
99	unsigned long bootmap_start, bootmap_size;
100	int i;
101
102	max_low_pfn = max_pfn = 0;
103	min_low_pfn = ~0;
104
105	for (i=0; i < sysmem.nr_banks; i++) {
106	pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
107	if (pfn < min_low_pfn)
108	min_low_pfn = pfn;
109	pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
110	if (pfn > max_pfn)
111	max_pfn = pfn;
112	}
113
114	if (min_low_pfn > max_pfn)
115	panic("No memory found!\n");
116
173d6681 CZ	117	max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
173d6681 CZ	118	max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;
3f65ce4d CZ	119
	120	/* Find an area to use for the bootmem bitmap. */
	121
264da9f7 JW	122	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
264da9f7 JW	123	bootmap_size <<= PAGE_SHIFT;
3f65ce4d CZ	124	bootmap_start = ~0;
	125
	126	for (i=0; i<sysmem.nr_banks; i++)
	127	if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
	128	bootmap_start = sysmem.bank[i].start;
	129	break;
	130	}
	131
	132	if (bootmap_start == ~0UL)
	133	panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
	134
	135	/* Reserve the bootmem bitmap area */
	136
	137	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
0bef42e5	138	bootmap_size = init_bootmem_node(NODE_DATA(0),
3f65ce4d	139	bootmap_start >> PAGE_SHIFT,
0bef42e5	140	min_low_pfn,
3f65ce4d CZ	141	max_low_pfn);
	142
	143	/* Add all remaining memory pieces into the bootmem map */
	144
	145	for (i=0; i<sysmem.nr_banks; i++)
	146	free_bootmem(sysmem.bank[i].start,
	147	sysmem.bank[i].end - sysmem.bank[i].start);
	148
	149	}
	150
	151
e5083a63	152	void __init zones_init(void)
3f65ce4d CZ	153	{
	154	unsigned long zones_size[MAX_NR_ZONES];
	155	int i;
	156
	157	/* All pages are DMA-able, so we put them all in the DMA zone. */
	158
c947a585	159	zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET;
3f65ce4d CZ	160	for (i = 1; i < MAX_NR_ZONES; i++)
	161	zones_size[i] = 0;
	162
	163	#ifdef CONFIG_HIGHMEM
	164	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
	165	#endif
	166
c947a585	167	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
3f65ce4d CZ	168	}
3f65ce4d CZ	169
3f65ce4d CZ	170	/*
	171	* Initialize memory pages.
	172	*/
	173
	174	void __init mem_init(void)
	175	{
	176	unsigned long codesize, reservedpages, datasize, initsize;
	177	unsigned long highmemsize, tmp, ram;
	178
c947a585 JW	179	max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET;
c947a585 JW	180	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
3f65ce4d CZ	181	highmemsize = 0;
3f65ce4d CZ	182
288a60cf	183	#ifdef CONFIG_HIGHMEM
3f65ce4d CZ	184	#error HIGHGMEM not implemented in init.c
	185	#endif
	186
	187	totalram_pages += free_all_bootmem();
	188
	189	reservedpages = ram = 0;
c947a585	190	for (tmp = 0; tmp < max_mapnr; tmp++) {
3f65ce4d CZ	191	ram++;
	192	if (PageReserved(mem_map+tmp))
	193	reservedpages++;
	194	}
	195
f022d0fa GU	196	codesize = (unsigned long) _etext - (unsigned long) _stext;
	197	datasize = (unsigned long) _edata - (unsigned long) _sdata;
	198	initsize = (unsigned long) __init_end - (unsigned long) __init_begin;
3f65ce4d CZ	199
	200	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
	201	"%ldk data, %ldk init %ldk highmem)\n",
cc013a88	202	nr_free_pages() << (PAGE_SHIFT-10),
3f65ce4d CZ	203	ram << (PAGE_SHIFT-10),
	204	codesize >> 10,
	205	reservedpages << (PAGE_SHIFT-10),
	206	datasize >> 10,
	207	initsize >> 10,
	208	highmemsize >> 10);
	209	}
	210
	211	void
	212	free_reserved_mem(void start, void end)
	213	{
	214	for (; start < end; start += PAGE_SIZE) {
	215	ClearPageReserved(virt_to_page(start));
7835e98b	216	init_page_count(virt_to_page(start));
3f65ce4d CZ	217	free_page((unsigned long)start);
	218	totalram_pages++;
	219	}
	220	}
	221
	222	#ifdef CONFIG_BLK_DEV_INITRD
	223	extern int initrd_is_mapped;
	224
	225	void free_initrd_mem(unsigned long start, unsigned long end)
	226	{
	227	if (initrd_is_mapped) {
	228	free_reserved_mem((void)start, (void)end);
	229	printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10);
	230	}
	231	}
	232	#endif
	233
	234	void free_initmem(void)
	235	{
f022d0fa GU	236	free_reserved_mem(__init_begin, __init_end);
	237	printk("Freeing unused kernel memory: %zuk freed\n",
	238	(__init_end - __init_begin) >> 10);
3f65ce4d	239	}