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

/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
 *
 *  linux/arch/sh/mm/init.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002, 2004  Paul Mundt
 *
 *  Based on linux/arch/i386/mm/init.c:
 *   Copyright (C) 1995  Linus Torvalds
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];

/*
 * Cache of MMU context last used.
 */
unsigned long mmu_context_cache = NO_CONTEXT;

#ifdef CONFIG_MMU
/* It'd be good if these lines were in the standard header file. */
#define START_PFN	(NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN	(NODE_DATA(0)->bdata->node_low_pfn)
#endif

void (*copy_page)(void *from, void *to);
void (*clear_page)(void *to);

void show_mem(void)
{
	int i, total = 0, reserved = 0;
	int shared = 0, cached = 0;

	printk("Mem-info:\n");
	show_free_areas();
	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	i = max_mapnr;
	while (i-- > 0) {
		total++;
		if (PageReserved(mem_map+i))
			reserved++;
		else if (PageSwapCache(mem_map+i))
			cached++;
		else if (page_count(mem_map+i))
			shared += page_count(mem_map+i) - 1;
	}
	printk("%d pages of RAM\n",total);
	printk("%d reserved pages\n",reserved);
	printk("%d pages shared\n",shared);
	printk("%d pages swap cached\n",cached);
}

#ifdef CONFIG_MMU
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_offset_k(addr);
	if (pgd_none(*pgd)) {
		pgd_ERROR(*pgd);
		return;
	}

	pud = pud_alloc(NULL, pgd, addr);
	if (unlikely(!pud)) {
		pud_ERROR(*pud);
		return;
	}

	pmd = pmd_alloc(NULL, pud, addr);
	if (unlikely(!pmd)) {
		pmd_ERROR(*pmd);
		return;
	}

	pte = pte_offset_kernel(pmd, addr);
	if (!pte_none(*pte)) {
		pte_ERROR(*pte);
		return;
	}

	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));

	__flush_tlb_page(get_asid(), addr);
}

/*
 * As a performance optimization, other platforms preserve the fixmap mapping
 * across a context switch, we don't presently do this, but this could be done
 * in a similar fashion as to the wired TLB interface that sh64 uses (by way
 * of the memorry mapped UTLB configuration) -- this unfortunately forces us to
 * give up a TLB entry for each mapping we want to preserve. While this may be
 * viable for a small number of fixmaps, it's not particularly useful for
 * everything and needs to be carefully evaluated. (ie, we may want this for
 * the vsyscall page).
 *
 * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
 * in at __set_fixmap() time to determine the appropriate behavior to follow.
 *
 *					 -- PFM.
 */
void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
		BUG();
		return;
	}

	set_pte_phys(address, phys, prot);
}
#endif	/* CONFIG_MMU */

/* References to section boundaries */

extern char _text, _etext, _edata, __bss_start, _end;
extern char __init_begin, __init_end;

/*
 * paging_init() sets up the page tables
 */
void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = { 0, };

	/*
	 * Setup some defaults for the zone sizes.. these should be safe
	 * regardless of distcontiguous memory or MMU settings.
	 */
	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
	zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
#endif

#ifdef CONFIG_MMU
	/*
	 * If we have an MMU, and want to be using it .. we need to adjust
	 * the zone sizes accordingly, in addition to turning it on.
	 */
	{
		unsigned long max_dma, low, start_pfn;

		/* We don't need to map the kernel through the TLB, as
		 * it is permanatly mapped using P1. So clear the
		 * entire pgd. */
		memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));

		/* Turn on the MMU */
		enable_mmu();

		/* Fixup the zone sizes */
		start_pfn = START_PFN;
		max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
		low = MAX_LOW_PFN;

		if (low < max_dma) {
			zones_size[ZONE_DMA] = low - start_pfn;
			zones_size[ZONE_NORMAL] = 0;
		} else {
			zones_size[ZONE_DMA] = max_dma - start_pfn;
			zones_size[ZONE_NORMAL] = low - max_dma;
		}
	}

	/* Set an initial value for the MMU.TTB so we don't have to
	 * check for a null value. */
	set_TTB(swapper_pg_dir);

#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
	/*
	 * If we don't have CONFIG_MMU set and the processor in question
	 * still has an MMU, care needs to be taken to make sure it doesn't
	 * stay on.. Since the boot loader could have potentially already
	 * turned it on, and we clearly don't want it, we simply turn it off.
	 *
	 * We don't need to do anything special for the zone sizes, since the
	 * default values that were already configured up above should be
	 * satisfactory.
	 */
	disable_mmu();
#endif
	NODE_DATA(0)->node_mem_map = NULL;
	free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
}

static struct kcore_list kcore_mem, kcore_vmalloc;

void __init mem_init(void)
{
	int codesize, reservedpages, datasize, initsize;
	int tmp;
	extern unsigned long memory_start;

#ifdef CONFIG_MMU
	high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
#else
	extern unsigned long memory_end;

	high_memory = (void *)(memory_end & PAGE_MASK);
#endif

	max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);

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

	/*
	 * Setup wrappers for copy/clear_page(), these will get overridden
	 * later in the boot process if a better method is available.
	 */
#ifdef CONFIG_MMU
	copy_page = copy_page_slow;
	clear_page = clear_page_slow;
#else
	copy_page = copy_page_nommu;
	clear_page = clear_page_nommu;
#endif

	/* this will put all low memory onto the freelists */
	totalram_pages += free_all_bootmem_node(NODE_DATA(0));
	reservedpages = 0;
	for (tmp = 0; tmp < num_physpages; tmp++)
		/*
		 * Only count reserved RAM pages
		 */
		if (PageReserved(mem_map+tmp))
			reservedpages++;

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

	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
		   VMALLOC_END - VMALLOC_START);

	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),
		max_mapnr << (PAGE_SHIFT-10),
		codesize >> 10,
		reservedpages << (PAGE_SHIFT-10),
		datasize >> 10,
		initsize >> 10);

	p3_cache_init();

	/* Initialize the vDSO */
	vsyscall_init();
}

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 ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
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 ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
Commit	Line	Data
1da177e4 LT	1	/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
	2	*
	3	* linux/arch/sh/mm/init.c
	4	*
	5	* Copyright (C) 1999 Niibe Yutaka
	6	* Copyright (C) 2002, 2004 Paul Mundt
	7	*
	8	* Based on linux/arch/i386/mm/init.c:
	9	* Copyright (C) 1995 Linus Torvalds
	10	*/
	11
1da177e4 LT	12	#include <linux/signal.h>
	13	#include <linux/sched.h>
	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/string.h>
	17	#include <linux/types.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/mman.h>
	20	#include <linux/mm.h>
	21	#include <linux/swap.h>
	22	#include <linux/smp.h>
	23	#include <linux/init.h>
	24	#include <linux/highmem.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/pagemap.h>
2cb7ce3b	27	#include <linux/proc_fs.h>
1da177e4 LT	28	#include <asm/processor.h>
	29	#include <asm/system.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/pgalloc.h>
	33	#include <asm/mmu_context.h>
	34	#include <asm/io.h>
	35	#include <asm/tlb.h>
	36	#include <asm/cacheflush.h>
	37	#include <asm/cache.h>
	38
	39	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	40	pgd_t swapper_pg_dir[PTRS_PER_PGD];
	41
	42	/*
	43	* Cache of MMU context last used.
	44	*/
	45	unsigned long mmu_context_cache = NO_CONTEXT;
	46
	47	#ifdef CONFIG_MMU
	48	/* It'd be good if these lines were in the standard header file. */
	49	#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
	50	#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
	51	#endif
	52
1da177e4 LT	53	void (copy_page)(void from, void *to);
	54	void (clear_page)(void to);
	55
	56	void show_mem(void)
	57	{
	58	int i, total = 0, reserved = 0;
	59	int shared = 0, cached = 0;
	60
	61	printk("Mem-info:\n");
	62	show_free_areas();
	63	printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	64	i = max_mapnr;
	65	while (i-- > 0) {
	66	total++;
	67	if (PageReserved(mem_map+i))
	68	reserved++;
	69	else if (PageSwapCache(mem_map+i))
	70	cached++;
	71	else if (page_count(mem_map+i))
	72	shared += page_count(mem_map+i) - 1;
	73	}
	74	printk("%d pages of RAM\n",total);
	75	printk("%d reserved pages\n",reserved);
	76	printk("%d pages shared\n",shared);
	77	printk("%d pages swap cached\n",cached);
	78	}
	79
11cbb70e	80	#ifdef CONFIG_MMU
1da177e4 LT	81	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	82	{
	83	pgd_t *pgd;
26ff6c11	84	pud_t *pud;
1da177e4 LT	85	pmd_t *pmd;
	86	pte_t *pte;
	87
99a596f9	88	pgd = pgd_offset_k(addr);
1da177e4 LT	89	if (pgd_none(*pgd)) {
	90	pgd_ERROR(*pgd);
	91	return;
	92	}
	93
99a596f9 SM	94	pud = pud_alloc(NULL, pgd, addr);
	95	if (unlikely(!pud)) {
	96	pud_ERROR(*pud);
	97	return;
26ff6c11 PM	98	}
26ff6c11 PM	99
99a596f9 SM	100	pmd = pmd_alloc(NULL, pud, addr);
	101	if (unlikely(!pmd)) {
	102	pmd_ERROR(*pmd);
	103	return;
1da177e4 LT	104	}
	105
	106	pte = pte_offset_kernel(pmd, addr);
	107	if (!pte_none(*pte)) {
	108	pte_ERROR(*pte);
	109	return;
	110	}
	111
	112	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
	113
	114	__flush_tlb_page(get_asid(), addr);
	115	}
	116
	117	/*
	118	* As a performance optimization, other platforms preserve the fixmap mapping
	119	* across a context switch, we don't presently do this, but this could be done
	120	* in a similar fashion as to the wired TLB interface that sh64 uses (by way
	121	* of the memorry mapped UTLB configuration) -- this unfortunately forces us to
	122	* give up a TLB entry for each mapping we want to preserve. While this may be
	123	* viable for a small number of fixmaps, it's not particularly useful for
	124	* everything and needs to be carefully evaluated. (ie, we may want this for
	125	* the vsyscall page).
	126	*
	127	* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
	128	* in at __set_fixmap() time to determine the appropriate behavior to follow.
	129	*
	130	* -- PFM.
	131	*/
	132	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	133	{
	134	unsigned long address = __fix_to_virt(idx);
	135
	136	if (idx >= __end_of_fixed_addresses) {
	137	BUG();
	138	return;
	139	}
	140
	141	set_pte_phys(address, phys, prot);
	142	}
11cbb70e	143	#endif /* CONFIG_MMU */
1da177e4 LT	144
	145	/* References to section boundaries */
	146
	147	extern char _text, _etext, _edata, __bss_start, _end;
	148	extern char __init_begin, __init_end;
	149
	150	/*
	151	* paging_init() sets up the page tables
1da177e4 LT	152	*/
	153	void __init paging_init(void)
	154	{
	155	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
	156
	157	/*
	158	* Setup some defaults for the zone sizes.. these should be safe
	159	* regardless of distcontiguous memory or MMU settings.
	160	*/
	161	zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
	162	zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
	163	#ifdef CONFIG_HIGHMEM
	164	zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
	165	#endif
	166
	167	#ifdef CONFIG_MMU
	168	/*
	169	* If we have an MMU, and want to be using it .. we need to adjust
	170	* the zone sizes accordingly, in addition to turning it on.
	171	*/
	172	{
	173	unsigned long max_dma, low, start_pfn;
1da177e4	174
6e4662ff SM	175	/* We don't need to map the kernel through the TLB, as
	176	* it is permanatly mapped using P1. So clear the
	177	* entire pgd. */
	178	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
1da177e4 LT	179
	180	/* Turn on the MMU */
	181	enable_mmu();
	182
	183	/* Fixup the zone sizes */
	184	start_pfn = START_PFN;
	185	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	186	low = MAX_LOW_PFN;
	187
	188	if (low < max_dma) {
	189	zones_size[ZONE_DMA] = low - start_pfn;
	190	zones_size[ZONE_NORMAL] = 0;
	191	} else {
	192	zones_size[ZONE_DMA] = max_dma - start_pfn;
	193	zones_size[ZONE_NORMAL] = low - max_dma;
	194	}
	195	}
	196
6e4662ff SM	197	/* Set an initial value for the MMU.TTB so we don't have to
	198	* check for a null value. */
	199	set_TTB(swapper_pg_dir);
	200
1da177e4 LT	201	#elif defined(CONFIG_CPU_SH3) \|\| defined(CONFIG_CPU_SH4)
	202	/*
	203	* If we don't have CONFIG_MMU set and the processor in question
	204	* still has an MMU, care needs to be taken to make sure it doesn't
	205	* stay on.. Since the boot loader could have potentially already
	206	* turned it on, and we clearly don't want it, we simply turn it off.
	207	*
	208	* We don't need to do anything special for the zone sizes, since the
	209	* default values that were already configured up above should be
	210	* satisfactory.
	211	*/
	212	disable_mmu();
	213	#endif
	214	NODE_DATA(0)->node_mem_map = NULL;
	215	free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
1da177e4 LT	216	}
1da177e4 LT	217
2cb7ce3b PM	218	static struct kcore_list kcore_mem, kcore_vmalloc;
2cb7ce3b PM	219
1da177e4 LT	220	void __init mem_init(void)
1da177e4 LT	221	{
1da177e4 LT	222	int codesize, reservedpages, datasize, initsize;
	223	int tmp;
	224	extern unsigned long memory_start;
	225
	226	#ifdef CONFIG_MMU
	227	high_memory = (void )__va(MAX_LOW_PFN PAGE_SIZE);
	228	#else
	229	extern unsigned long memory_end;
	230
	231	high_memory = (void *)(memory_end & PAGE_MASK);
	232	#endif
	233
	234	max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
	235
	236	/* clear the zero-page */
	237	memset(empty_zero_page, 0, PAGE_SIZE);
	238	__flush_wback_region(empty_zero_page, PAGE_SIZE);
	239
65463b73	240	/*
1da177e4 LT	241	* Setup wrappers for copy/clear_page(), these will get overridden
	242	* later in the boot process if a better method is available.
	243	*/
e96636cc	244	#ifdef CONFIG_MMU
1da177e4 LT	245	copy_page = copy_page_slow;
1da177e4 LT	246	clear_page = clear_page_slow;
e96636cc YS	247	#else
	248	copy_page = copy_page_nommu;
	249	clear_page = clear_page_nommu;
	250	#endif
1da177e4 LT	251
	252	/* this will put all low memory onto the freelists */
	253	totalram_pages += free_all_bootmem_node(NODE_DATA(0));
1da177e4 LT	254	reservedpages = 0;
	255	for (tmp = 0; tmp < num_physpages; tmp++)
	256	/*
	257	* Only count reserved RAM pages
	258	*/
	259	if (PageReserved(mem_map+tmp))
	260	reservedpages++;
	261
	262	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	263	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	264	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	265
2cb7ce3b PM	266	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	267	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	268	VMALLOC_END - VMALLOC_START);
	269
	270	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
	271	"%dk reserved, %dk data, %dk init)\n",
1da177e4 LT	272	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	273	max_mapnr << (PAGE_SHIFT-10),
	274	codesize >> 10,
	275	reservedpages << (PAGE_SHIFT-10),
	276	datasize >> 10,
	277	initsize >> 10);
	278
	279	p3_cache_init();
19f9a34f PM	280
	281	/* Initialize the vDSO */
	282	vsyscall_init();
1da177e4 LT	283	}
	284
	285	void free_initmem(void)
	286	{
	287	unsigned long addr;
65463b73	288
1da177e4 LT	289	addr = (unsigned long)(&__init_begin);
	290	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	291	ClearPageReserved(virt_to_page(addr));
7835e98b	292	init_page_count(virt_to_page(addr));
1da177e4 LT	293	free_page(addr);
	294	totalram_pages++;
	295	}
	296	printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
	297	}
	298
	299	#ifdef CONFIG_BLK_DEV_INITRD
	300	void free_initrd_mem(unsigned long start, unsigned long end)
	301	{
	302	unsigned long p;
	303	for (p = start; p < end; p += PAGE_SIZE) {
	304	ClearPageReserved(virt_to_page(p));
7835e98b	305	init_page_count(virt_to_page(p));
1da177e4 LT	306	free_page(p);
	307	totalram_pages++;
	308	}
	309	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	310	}
	311	#endif
	312