[linux-2.6-block.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 <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>

/* References to section boundaries */
extern char _text, _etext, _edata;
extern char __init_begin, __init_end;

pgd_t swapper_pg_dir[1024];

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

void show_mem(void)
{
	int total = 0, reserved = 0;
	int shared = 0, cached = 0;
	int highmem = 0;
	struct page *page;
	pg_data_t *pgdat;
	unsigned long i;

	printk("Mem-info:\n");
	show_free_areas();
	printk("Free swap:       %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
	for_each_online_pgdat(pgdat) {
		unsigned long flags;
		pgdat_resize_lock(pgdat, &flags);
		for (i = 0; i < pgdat->node_spanned_pages; ++i) {
			page = pgdat_page_nr(pgdat, i);
			total++;
			if (PageHighMem(page))
				highmem++;
			if (PageReserved(page))
				reserved++;
			else if (PageSwapCache(page))
				cached++;
			else if (page_count(page))
				shared += page_count(page) - 1;
		}
		pgdat_resize_unlock(pgdat, &flags);
	}
	printk("%d pages of RAM\n", total);
	printk("%d pages of HIGHMEM\n",highmem);
	printk("%d reserved pages\n",reserved);
	printk("%d pages shared\n",shared);
	printk("%d pages swap cached\n",cached);
}

/*
 * 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_boot_start >> PAGE_SHIFT)
#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)
		totalram_pages += 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",
		(unsigned long) 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)
{
	unsigned long addr;

	addr = (unsigned long)(&__init_begin);
	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(addr));
		init_page_count(virt_to_page(addr));
		free_page(addr);
		totalram_pages++;
	}
	printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
	  (int)(&__init_end - &__init_begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
/*======================================================================*
 * free_initrd_mem() :
 * orig : arch/sh/mm/init.c
 *======================================================================*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
	unsigned long p;
	for (p = start; p < end; p += PAGE_SIZE) {
		ClearPageReserved(virt_to_page(p));
		init_page_count(virt_to_page(p));
		free_page(p);
		totalram_pages++;
	}
	printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#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>
1da177e4 LT	22	#include <asm/types.h>
	23	#include <asm/processor.h>
	24	#include <asm/page.h>
	25	#include <asm/pgtable.h>
	26	#include <asm/pgalloc.h>
	27	#include <asm/mmu_context.h>
	28	#include <asm/setup.h>
	29	#include <asm/tlb.h>
	30
	31	/* References to section boundaries */
	32	extern char _text, _etext, _edata;
	33	extern char __init_begin, __init_end;
	34
	35	pgd_t swapper_pg_dir[1024];
	36
	37	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	38
	39	void show_mem(void)
	40	{
	41	int total = 0, reserved = 0;
	42	int shared = 0, cached = 0;
	43	int highmem = 0;
	44	struct page *page;
	45	pg_data_t *pgdat;
	46	unsigned long i;
	47
	48	printk("Mem-info:\n");
	49	show_free_areas();
	50	printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
ec936fc5	51	for_each_online_pgdat(pgdat) {
208d54e5 DH	52	unsigned long flags;
208d54e5 DH	53	pgdat_resize_lock(pgdat, &flags);
1da177e4	54	for (i = 0; i < pgdat->node_spanned_pages; ++i) {
408fde81	55	page = pgdat_page_nr(pgdat, i);
1da177e4 LT	56	total++;
	57	if (PageHighMem(page))
	58	highmem++;
	59	if (PageReserved(page))
	60	reserved++;
	61	else if (PageSwapCache(page))
	62	cached++;
	63	else if (page_count(page))
	64	shared += page_count(page) - 1;
	65	}
208d54e5	66	pgdat_resize_unlock(pgdat, &flags);
1da177e4 LT	67	}
	68	printk("%d pages of RAM\n", total);
	69	printk("%d pages of HIGHMEM\n",highmem);
	70	printk("%d reserved pages\n",reserved);
	71	printk("%d pages shared\n",shared);
	72	printk("%d pages swap cached\n",cached);
	73	}
	74
	75	/*
	76	* Cache of MMU context last used.
	77	*/
	78	#ifndef CONFIG_SMP
	79	unsigned long mmu_context_cache_dat;
	80	#else
	81	unsigned long mmu_context_cache_dat[NR_CPUS];
	82	#endif
	83	static unsigned long hole_pages;
	84
	85	/*
	86	* function prototype
	87	*/
	88	void __init paging_init(void);
	89	void __init mem_init(void);
	90	void free_initmem(void);
	91	#ifdef CONFIG_BLK_DEV_INITRD
	92	void free_initrd_mem(unsigned long, unsigned long);
	93	#endif
	94
	95	/* It'd be good if these lines were in the standard header file. */
	96	#define START_PFN(nid) \
	97	(NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
	98	#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
	99
	100	#ifndef CONFIG_DISCONTIGMEM
	101	unsigned long __init zone_sizes_init(void)
	102	{
f06a9684	103	unsigned long zones_size[MAX_NR_ZONES] = {0, };
1da177e4 LT	104	unsigned long max_dma;
	105	unsigned long low;
	106	unsigned long start_pfn;
	107
	108	#ifdef CONFIG_MMU
	109	start_pfn = START_PFN(0);
	110	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	111	low = MAX_LOW_PFN(0);
	112
	113	if (low < max_dma){
	114	zones_size[ZONE_DMA] = low - start_pfn;
	115	zones_size[ZONE_NORMAL] = 0;
	116	} else {
	117	zones_size[ZONE_DMA] = low - start_pfn;
	118	zones_size[ZONE_NORMAL] = low - max_dma;
	119	}
	120	#else
	121	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
	122	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
	123	start_pfn = __MEMORY_START >> PAGE_SHIFT;
	124	#endif /* CONFIG_MMU */
	125
9109fb7b	126	free_area_init_node(0, zones_size, start_pfn, 0);
1da177e4 LT	127
	128	return 0;
	129	}
	130	#else /* CONFIG_DISCONTIGMEM */
	131	extern unsigned long zone_sizes_init(void);
	132	#endif /* CONFIG_DISCONTIGMEM */
	133
	134	/======================================================================
	135	* paging_init() : sets up the page tables
	136	======================================================================/
	137	void __init paging_init(void)
	138	{
	139	#ifdef CONFIG_MMU
	140	int i;
	141	pgd_t *pg_dir;
	142
	143	/* We don't need kernel mapping as hardware support that. */
	144	pg_dir = swapper_pg_dir;
	145
	146	for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
	147	pgd_val(pg_dir[i]) = 0;
	148	#endif /* CONFIG_MMU */
	149	hole_pages = zone_sizes_init();
	150	}
	151
	152	int __init reservedpages_count(void)
	153	{
	154	int reservedpages, nid, i;
	155
	156	reservedpages = 0;
208d54e5 DH	157	for_each_online_node(nid) {
	158	unsigned long flags;
	159	pgdat_resize_lock(NODE_DATA(nid), &flags);
1da177e4	160	for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
408fde81	161	if (PageReserved(nid_page_nr(nid, i)))
1da177e4	162	reservedpages++;
208d54e5 DH	163	pgdat_resize_unlock(NODE_DATA(nid), &flags);
208d54e5 DH	164	}
1da177e4 LT	165
	166	return reservedpages;
	167	}
	168
	169	/======================================================================
	170	* mem_init() :
	171	* orig : arch/sh/mm/init.c
	172	======================================================================/
	173	void __init mem_init(void)
	174	{
	175	int codesize, reservedpages, datasize, initsize;
	176	int nid;
	177	#ifndef CONFIG_MMU
	178	extern unsigned long memory_end;
	179	#endif
	180
	181	num_physpages = 0;
	182	for_each_online_node(nid)
	183	num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
	184
	185	num_physpages -= hole_pages;
	186
	187	#ifndef CONFIG_DISCONTIGMEM
	188	max_mapnr = num_physpages;
	189	#endif /* CONFIG_DISCONTIGMEM */
	190
	191	#ifdef CONFIG_MMU
	192	high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
	193	#else
	194	high_memory = (void *)(memory_end & PAGE_MASK);
	195	#endif /* CONFIG_MMU */
	196
	197	/* clear the zero-page */
	198	memset(empty_zero_page, 0, PAGE_SIZE);
	199
	200	/* this will put all low memory onto the freelists */
	201	for_each_online_node(nid)
	202	totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
	203
	204	reservedpages = reservedpages_count() - hole_pages;
	205	codesize = (unsigned long) &_etext - (unsigned long)&_text;
	206	datasize = (unsigned long) &_edata - (unsigned long)&_etext;
	207	initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
	208
	209	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
	210	"%dk reserved, %dk data, %dk init)\n",
	211	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	212	num_physpages << (PAGE_SHIFT-10),
	213	codesize >> 10,
	214	reservedpages << (PAGE_SHIFT-10),
	215	datasize >> 10,
	216	initsize >> 10);
	217	}
	218
	219	/======================================================================
	220	* free_initmem() :
	221	* orig : arch/sh/mm/init.c
	222	======================================================================/
	223	void free_initmem(void)
	224	{
	225	unsigned long addr;
	226
	227	addr = (unsigned long)(&__init_begin);
	228	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
229	ClearPageReserved(virt_to_page(addr));
7835e98b	230	init_page_count(virt_to_page(addr));
1da177e4 LT	231	free_page(addr);
	232	totalram_pages++;
	233	}
	234	printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
	235	(int)(&__init_end - &__init_begin) >> 10);
	236	}
	237
	238	#ifdef CONFIG_BLK_DEV_INITRD
	239	/======================================================================
	240	* free_initrd_mem() :
	241	* orig : arch/sh/mm/init.c
	242	======================================================================/
	243	void free_initrd_mem(unsigned long start, unsigned long end)
	244	{
	245	unsigned long p;
	246	for (p = start; p < end; p += PAGE_SIZE) {
	247	ClearPageReserved(virt_to_page(p));
7835e98b	248	init_page_count(virt_to_page(p));
1da177e4 LT	249	free_page(p);
	250	totalram_pages++;
	251	}
	252	printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	253	}
	254	#endif
	255