[deliverable/linux.git] / arch / m32r / mm / init.c

/*
 *  linux/arch/m32r/mm/init.c
 *
 *  Copyright (c) 2001, 2002  Hitoshi Yamamoto
 *
 *  Some code taken from sh version.
 *    Copyright (C) 1999  Niibe Yutaka
 *    Based on linux/arch/i386/mm/init.c:
 *      Copyright (C) 1995  Linus Torvalds
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/swap.h>
#include <linux/highmem.h>
#include <linux/bitops.h>
#include <linux/nodemask.h>
#include <linux/pfn.h>
#include <linux/gfp.h>
#include <asm/types.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/tlb.h>
#include <asm/sections.h>

pgd_t swapper_pg_dir[1024];

/*
 * Cache of MMU context last used.
 */
#ifndef CONFIG_SMP
unsigned long mmu_context_cache_dat;
#else
unsigned long mmu_context_cache_dat[NR_CPUS];
#endif
static unsigned long hole_pages;

/*
 * function prototype
 */
void __init paging_init(void);
void __init mem_init(void);
void free_initmem(void);
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long, unsigned long);
#endif

/* It'd be good if these lines were in the standard header file. */
#define START_PFN(nid)		(NODE_DATA(nid)->bdata->node_min_pfn)
#define MAX_LOW_PFN(nid)	(NODE_DATA(nid)->bdata->node_low_pfn)

#ifndef CONFIG_DISCONTIGMEM
unsigned long __init zone_sizes_init(void)
{
	unsigned long  zones_size[MAX_NR_ZONES] = {0, };
	unsigned long  max_dma;
	unsigned long  low;
	unsigned long  start_pfn;

#ifdef CONFIG_MMU
	start_pfn = START_PFN(0);
	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	low = MAX_LOW_PFN(0);

	if (low < max_dma){
		zones_size[ZONE_DMA] = low - start_pfn;
		zones_size[ZONE_NORMAL] = 0;
	} else {
		zones_size[ZONE_DMA] = low - start_pfn;
		zones_size[ZONE_NORMAL] = low - max_dma;
	}
#else
	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
	start_pfn = __MEMORY_START >> PAGE_SHIFT;
#endif /* CONFIG_MMU */

	free_area_init_node(0, zones_size, start_pfn, 0);

	return 0;
}
#else	/* CONFIG_DISCONTIGMEM */
extern unsigned long zone_sizes_init(void);
#endif	/* CONFIG_DISCONTIGMEM */

/*======================================================================*
 * paging_init() : sets up the page tables
 *======================================================================*/
void __init paging_init(void)
{
#ifdef CONFIG_MMU
	int  i;
	pgd_t *pg_dir;

	/* We don't need kernel mapping as hardware support that. */
	pg_dir = swapper_pg_dir;

	for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
		pgd_val(pg_dir[i]) = 0;
#endif /* CONFIG_MMU */
	hole_pages = zone_sizes_init();
}

int __init reservedpages_count(void)
{
	int reservedpages, nid, i;

	reservedpages = 0;
	for_each_online_node(nid) {
		unsigned long flags;
		pgdat_resize_lock(NODE_DATA(nid), &flags);
		for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
			if (PageReserved(nid_page_nr(nid, i)))
				reservedpages++;
		pgdat_resize_unlock(NODE_DATA(nid), &flags);
	}

	return reservedpages;
}

/*======================================================================*
 * mem_init() :
 * orig : arch/sh/mm/init.c
 *======================================================================*/
void __init mem_init(void)
{
	int codesize, reservedpages, datasize, initsize;
	int nid;
#ifndef CONFIG_MMU
	extern unsigned long memory_end;
#endif

	num_physpages = 0;
	for_each_online_node(nid)
		num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;

	num_physpages -= hole_pages;

#ifndef CONFIG_DISCONTIGMEM
	max_mapnr = num_physpages;
#endif	/* CONFIG_DISCONTIGMEM */

#ifdef CONFIG_MMU
	high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
#else
	high_memory = (void *)(memory_end & PAGE_MASK);
#endif /* CONFIG_MMU */

	/* clear the zero-page */
	memset(empty_zero_page, 0, PAGE_SIZE);

	/* this will put all low memory onto the freelists */
	for_each_online_node(nid)
		free_all_bootmem_node(NODE_DATA(nid));

	reservedpages = reservedpages_count() - hole_pages;
	codesize = (unsigned long) &_etext - (unsigned long)&_text;
	datasize = (unsigned long) &_edata - (unsigned long)&_etext;
	initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;

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

/*======================================================================*
 * free_initmem() :
 * orig : arch/sh/mm/init.c
 *======================================================================*/
void free_initmem(void)
{
	free_initmem_default(-1);
}

#ifdef CONFIG_BLK_DEV_INITRD
/*======================================================================*
 * free_initrd_mem() :
 * orig : arch/sh/mm/init.c
 *======================================================================*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m32r/mm/init.c
	3	*
	4	* Copyright (c) 2001, 2002 Hitoshi Yamamoto
	5	*
	6	* Some code taken from sh version.
	7	* Copyright (C) 1999 Niibe Yutaka
	8	* Based on linux/arch/i386/mm/init.c:
	9	* Copyright (C) 1995 Linus Torvalds
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/mm.h>
	15	#include <linux/pagemap.h>
	16	#include <linux/bootmem.h>
	17	#include <linux/swap.h>
	18	#include <linux/highmem.h>
	19	#include <linux/bitops.h>
	20	#include <linux/nodemask.h>
22a9835c	21	#include <linux/pfn.h>
5a0e3ad6	22	#include <linux/gfp.h>
1da177e4 LT	23	#include <asm/types.h>
	24	#include <asm/processor.h>
	25	#include <asm/page.h>
	26	#include <asm/pgtable.h>
	27	#include <asm/pgalloc.h>
	28	#include <asm/mmu_context.h>
	29	#include <asm/setup.h>
	30	#include <asm/tlb.h>
8be65857	31	#include <asm/sections.h>
1da177e4 LT	32
	33	pgd_t swapper_pg_dir[1024];
	34
1da177e4 LT	35	/*
	36	* Cache of MMU context last used.
	37	*/
	38	#ifndef CONFIG_SMP
	39	unsigned long mmu_context_cache_dat;
	40	#else
	41	unsigned long mmu_context_cache_dat[NR_CPUS];
	42	#endif
	43	static unsigned long hole_pages;
	44
	45	/*
	46	* function prototype
	47	*/
	48	void __init paging_init(void);
	49	void __init mem_init(void);
	50	void free_initmem(void);
	51	#ifdef CONFIG_BLK_DEV_INITRD
	52	void free_initrd_mem(unsigned long, unsigned long);
	53	#endif
	54
	55	/* It'd be good if these lines were in the standard header file. */
3560e249	56	#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
1da177e4 LT	57	#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
	58
	59	#ifndef CONFIG_DISCONTIGMEM
	60	unsigned long __init zone_sizes_init(void)
	61	{
f06a9684	62	unsigned long zones_size[MAX_NR_ZONES] = {0, };
1da177e4 LT	63	unsigned long max_dma;
	64	unsigned long low;
	65	unsigned long start_pfn;
	66
	67	#ifdef CONFIG_MMU
	68	start_pfn = START_PFN(0);
	69	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	70	low = MAX_LOW_PFN(0);
	71
	72	if (low < max_dma){
	73	zones_size[ZONE_DMA] = low - start_pfn;
	74	zones_size[ZONE_NORMAL] = 0;
	75	} else {
	76	zones_size[ZONE_DMA] = low - start_pfn;
	77	zones_size[ZONE_NORMAL] = low - max_dma;
	78	}
	79	#else
	80	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
	81	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
	82	start_pfn = __MEMORY_START >> PAGE_SHIFT;
	83	#endif /* CONFIG_MMU */
	84
9109fb7b	85	free_area_init_node(0, zones_size, start_pfn, 0);
1da177e4 LT	86
	87	return 0;
	88	}
	89	#else /* CONFIG_DISCONTIGMEM */
	90	extern unsigned long zone_sizes_init(void);
	91	#endif /* CONFIG_DISCONTIGMEM */
	92
	93	/======================================================================
	94	* paging_init() : sets up the page tables
	95	======================================================================/
	96	void __init paging_init(void)
	97	{
	98	#ifdef CONFIG_MMU
	99	int i;
	100	pgd_t *pg_dir;
	101
	102	/* We don't need kernel mapping as hardware support that. */
	103	pg_dir = swapper_pg_dir;
	104
	105	for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
	106	pgd_val(pg_dir[i]) = 0;
	107	#endif /* CONFIG_MMU */
	108	hole_pages = zone_sizes_init();
	109	}
	110
	111	int __init reservedpages_count(void)
	112	{
	113	int reservedpages, nid, i;
	114
	115	reservedpages = 0;
208d54e5 DH	116	for_each_online_node(nid) {
	117	unsigned long flags;
	118	pgdat_resize_lock(NODE_DATA(nid), &flags);
1da177e4	119	for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
408fde81	120	if (PageReserved(nid_page_nr(nid, i)))
1da177e4	121	reservedpages++;
208d54e5 DH	122	pgdat_resize_unlock(NODE_DATA(nid), &flags);
208d54e5 DH	123	}
1da177e4 LT	124
	125	return reservedpages;
	126	}
	127
	128	/======================================================================
	129	* mem_init() :
	130	* orig : arch/sh/mm/init.c
	131	======================================================================/
	132	void __init mem_init(void)
	133	{
	134	int codesize, reservedpages, datasize, initsize;
	135	int nid;
	136	#ifndef CONFIG_MMU
	137	extern unsigned long memory_end;
	138	#endif
	139
	140	num_physpages = 0;
	141	for_each_online_node(nid)
	142	num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
	143
	144	num_physpages -= hole_pages;
	145
	146	#ifndef CONFIG_DISCONTIGMEM
	147	max_mapnr = num_physpages;
	148	#endif /* CONFIG_DISCONTIGMEM */
	149
	150	#ifdef CONFIG_MMU
	151	high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
	152	#else
	153	high_memory = (void *)(memory_end & PAGE_MASK);
	154	#endif /* CONFIG_MMU */
	155
	156	/* clear the zero-page */
	157	memset(empty_zero_page, 0, PAGE_SIZE);
	158
	159	/* this will put all low memory onto the freelists */
	160	for_each_online_node(nid)
0c988534	161	free_all_bootmem_node(NODE_DATA(nid));
1da177e4 LT	162
	163	reservedpages = reservedpages_count() - hole_pages;
	164	codesize = (unsigned long) &_etext - (unsigned long)&_text;
	165	datasize = (unsigned long) &_edata - (unsigned long)&_etext;
	166	initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
	167
	168	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
	169	"%dk reserved, %dk data, %dk init)\n",
cc013a88	170	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	171	num_physpages << (PAGE_SHIFT-10),
	172	codesize >> 10,
	173	reservedpages << (PAGE_SHIFT-10),
	174	datasize >> 10,
	175	initsize >> 10);
	176	}
	177
	178	/======================================================================
	179	* free_initmem() :
	180	* orig : arch/sh/mm/init.c
	181	======================================================================/
	182	void free_initmem(void)
	183	{
dbe67df4	184	free_initmem_default(-1);
1da177e4 LT	185	}
	186
	187	#ifdef CONFIG_BLK_DEV_INITRD
	188	/======================================================================
	189	* free_initrd_mem() :
	190	* orig : arch/sh/mm/init.c
	191	======================================================================/
	192	void free_initrd_mem(unsigned long start, unsigned long end)
	193	{
dbe67df4	194	free_reserved_area((void )start, (void )end, -1, "initrd");
1da177e4 LT	195	}
1da177e4 LT	196	#endif