[deliverable/linux.git] / arch / sparc / mm / init_32.c

/*
 *  linux/arch/sparc/mm/init.c
 *
 *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
 *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *  Copyright (C) 2000 Anton Blanchard (anton@samba.org)
 */

#include <linux/module.h>
#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/initrd.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/poison.h>
#include <linux/gfp.h>

#include <asm/sections.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/vaddrs.h>
#include <asm/pgalloc.h>	/* bug in asm-generic/tlb.h: check_pgt_cache */
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/leon.h>

unsigned long *sparc_valid_addr_bitmap;
EXPORT_SYMBOL(sparc_valid_addr_bitmap);

unsigned long phys_base;
EXPORT_SYMBOL(phys_base);

unsigned long pfn_base;
EXPORT_SYMBOL(pfn_base);

unsigned long page_kernel;
EXPORT_SYMBOL(page_kernel);

struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
unsigned long sparc_unmapped_base;

struct pgtable_cache_struct pgt_quicklists;

/* Initial ramdisk setup */
extern unsigned int sparc_ramdisk_image;
extern unsigned int sparc_ramdisk_size;

unsigned long highstart_pfn, highend_pfn;

pte_t *kmap_pte;
pgprot_t kmap_prot;

#define kmap_get_fixmap_pte(vaddr) \
	pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))

void __init kmap_init(void)
{
	/* cache the first kmap pte */
	kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
	kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
}

void show_mem(unsigned int filter)
{
	printk("Mem-info:\n");
	show_free_areas(filter);
	printk("Free swap:       %6ldkB\n",
	       nr_swap_pages << (PAGE_SHIFT-10));
	printk("%ld pages of RAM\n", totalram_pages);
	printk("%ld free pages\n", nr_free_pages());
#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
	printk("%ld pages in page table cache\n",pgtable_cache_size);
#ifndef CONFIG_SMP
	if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
		printk("%ld entries in page dir cache\n",pgd_cache_size);
#endif	
#endif
}

void __init sparc_context_init(int numctx)
{
	int ctx;

	ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);

	for(ctx = 0; ctx < numctx; ctx++) {
		struct ctx_list *clist;

		clist = (ctx_list_pool + ctx);
		clist->ctx_number = ctx;
		clist->ctx_mm = NULL;
	}
	ctx_free.next = ctx_free.prev = &ctx_free;
	ctx_used.next = ctx_used.prev = &ctx_used;
	for(ctx = 0; ctx < numctx; ctx++)
		add_to_free_ctxlist(ctx_list_pool + ctx);
}

extern unsigned long cmdline_memory_size;
unsigned long last_valid_pfn;

unsigned long calc_highpages(void)
{
	int i;
	int nr = 0;

	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
		unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;

		if (end_pfn <= max_low_pfn)
			continue;

		if (start_pfn < max_low_pfn)
			start_pfn = max_low_pfn;

		nr += end_pfn - start_pfn;
	}

	return nr;
}

static unsigned long calc_max_low_pfn(void)
{
	int i;
	unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
	unsigned long curr_pfn, last_pfn;

	last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
	for (i = 1; sp_banks[i].num_bytes != 0; i++) {
		curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;

		if (curr_pfn >= tmp) {
			if (last_pfn < tmp)
				tmp = last_pfn;
			break;
		}

		last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	}

	return tmp;
}

unsigned long __init bootmem_init(unsigned long *pages_avail)
{
	unsigned long bootmap_size, start_pfn;
	unsigned long end_of_phys_memory = 0UL;
	unsigned long bootmap_pfn, bytes_avail, size;
	int i;

	bytes_avail = 0UL;
	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		end_of_phys_memory = sp_banks[i].base_addr +
			sp_banks[i].num_bytes;
		bytes_avail += sp_banks[i].num_bytes;
		if (cmdline_memory_size) {
			if (bytes_avail > cmdline_memory_size) {
				unsigned long slack = bytes_avail - cmdline_memory_size;

				bytes_avail -= slack;
				end_of_phys_memory -= slack;

				sp_banks[i].num_bytes -= slack;
				if (sp_banks[i].num_bytes == 0) {
					sp_banks[i].base_addr = 0xdeadbeef;
				} else {
					sp_banks[i+1].num_bytes = 0;
					sp_banks[i+1].base_addr = 0xdeadbeef;
				}
				break;
			}
		}
	}

	/* Start with page aligned address of last symbol in kernel
	 * image.  
	 */
	start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));

	/* Now shift down to get the real physical page frame number. */
	start_pfn >>= PAGE_SHIFT;

	bootmap_pfn = start_pfn;

	max_pfn = end_of_phys_memory >> PAGE_SHIFT;

	max_low_pfn = max_pfn;
	highstart_pfn = highend_pfn = max_pfn;

	if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
		highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
		max_low_pfn = calc_max_low_pfn();
		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
		    calc_highpages() >> (20 - PAGE_SHIFT));
	}

#ifdef CONFIG_BLK_DEV_INITRD
	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
	if (sparc_ramdisk_image) {
		if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
			sparc_ramdisk_image -= KERNBASE;
		initrd_start = sparc_ramdisk_image + phys_base;
		initrd_end = initrd_start + sparc_ramdisk_size;
		if (initrd_end > end_of_phys_memory) {
			printk(KERN_CRIT "initrd extends beyond end of memory "
		                 	 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
			       initrd_end, end_of_phys_memory);
			initrd_start = 0;
		}
		if (initrd_start) {
			if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
			    initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
				bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
		}
	}
#endif	
	/* Initialize the boot-time allocator. */
	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
					 max_low_pfn);

	/* Now register the available physical memory with the
	 * allocator.
	 */
	*pages_avail = 0;
	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		unsigned long curr_pfn, last_pfn;

		curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
		if (curr_pfn >= max_low_pfn)
			break;

		last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
		if (last_pfn > max_low_pfn)
			last_pfn = max_low_pfn;

		/*
		 * .. finally, did all the rounding and playing
		 * around just make the area go away?
		 */
		if (last_pfn <= curr_pfn)
			continue;

		size = (last_pfn - curr_pfn) << PAGE_SHIFT;
		*pages_avail += last_pfn - curr_pfn;

		free_bootmem(sp_banks[i].base_addr, size);
	}

#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start) {
		/* Reserve the initrd image area. */
		size = initrd_end - initrd_start;
		reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
		*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;

		initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
		initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;		
	}
#endif
	/* Reserve the kernel text/data/bss. */
	size = (start_pfn << PAGE_SHIFT) - phys_base;
	reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;

	/* Reserve the bootmem map.   We do not account for it
	 * in pages_avail because we will release that memory
	 * in free_all_bootmem.
	 */
	size = bootmap_size;
	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;

	return max_pfn;
}

/*
 * check_pgt_cache
 *
 * This is called at the end of unmapping of VMA (zap_page_range),
 * to rescan the page cache for architecture specific things.
 * Most architectures define check_pgt_cache empty.
 *
 * We simply copy the 2.4 implementation for now.
 */
static int pgt_cache_water[2] = { 25, 50 };

void check_pgt_cache(void)
{
	do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
}

/*
 * paging_init() sets up the page tables: We call the MMU specific
 * init routine based upon the Sun model type on the Sparc.
 *
 */
extern void srmmu_paging_init(void);
extern void device_scan(void);

pgprot_t PAGE_SHARED __read_mostly;
EXPORT_SYMBOL(PAGE_SHARED);

void __init paging_init(void)
{
	switch(sparc_cpu_model) {
	case sparc_leon:
		leon_init();
		/* fall through */
	case sun4m:
	case sun4d:
		srmmu_paging_init();
		sparc_unmapped_base = 0x50000000;
		BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
		break;
	default:
		prom_printf("paging_init: Cannot init paging on this Sparc\n");
		prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
		prom_printf("paging_init: Halting...\n");
		prom_halt();
	}

	/* Initialize the protection map with non-constant, MMU dependent values. */
	protection_map[0] = PAGE_NONE;
	protection_map[1] = PAGE_READONLY;
	protection_map[2] = PAGE_COPY;
	protection_map[3] = PAGE_COPY;
	protection_map[4] = PAGE_READONLY;
	protection_map[5] = PAGE_READONLY;
	protection_map[6] = PAGE_COPY;
	protection_map[7] = PAGE_COPY;
	protection_map[8] = PAGE_NONE;
	protection_map[9] = PAGE_READONLY;
	protection_map[10] = PAGE_SHARED;
	protection_map[11] = PAGE_SHARED;
	protection_map[12] = PAGE_READONLY;
	protection_map[13] = PAGE_READONLY;
	protection_map[14] = PAGE_SHARED;
	protection_map[15] = PAGE_SHARED;
	btfixup();
	prom_build_devicetree();
	of_fill_in_cpu_data();
	device_scan();
}

static void __init taint_real_pages(void)
{
	int i;

	for (i = 0; sp_banks[i].num_bytes; i++) {
		unsigned long start, end;

		start = sp_banks[i].base_addr;
		end = start + sp_banks[i].num_bytes;

		while (start < end) {
			set_bit(start >> 20, sparc_valid_addr_bitmap);
			start += PAGE_SIZE;
		}
	}
}

static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
{
	unsigned long tmp;

#ifdef CONFIG_DEBUG_HIGHMEM
	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
#endif

	for (tmp = start_pfn; tmp < end_pfn; tmp++) {
		struct page *page = pfn_to_page(tmp);

		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		totalhigh_pages++;
	}
}

void __init mem_init(void)
{
	int codepages = 0;
	int datapages = 0;
	int initpages = 0; 
	int reservedpages = 0;
	int i;

	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
		prom_printf("BUG: fixmap and pkmap areas overlap\n");
		prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
		       PKMAP_BASE,
		       (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
		       FIXADDR_START);
		prom_printf("Please mail sparclinux@vger.kernel.org.\n");
		prom_halt();
	}


	/* Saves us work later. */
	memset((void *)&empty_zero_page, 0, PAGE_SIZE);

	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	i += 1;
	sparc_valid_addr_bitmap = (unsigned long *)
		__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);

	if (sparc_valid_addr_bitmap == NULL) {
		prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
		prom_halt();
	}
	memset(sparc_valid_addr_bitmap, 0, i << 2);

	taint_real_pages();

	max_mapnr = last_valid_pfn - pfn_base;
	high_memory = __va(max_low_pfn << PAGE_SHIFT);

	totalram_pages = free_all_bootmem();

	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
		unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;

		num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;

		if (end_pfn <= highstart_pfn)
			continue;

		if (start_pfn < highstart_pfn)
			start_pfn = highstart_pfn;

		map_high_region(start_pfn, end_pfn);
	}
	
	totalram_pages += totalhigh_pages;

	codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
	datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
	initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;

	/* Ignore memory holes for the purpose of counting reserved pages */
	for (i=0; i < max_low_pfn; i++)
		if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
		    && PageReserved(pfn_to_page(i)))
			reservedpages++;

	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
	       nr_free_pages() << (PAGE_SHIFT-10),
	       num_physpages << (PAGE_SHIFT - 10),
	       codepages << (PAGE_SHIFT-10),
	       reservedpages << (PAGE_SHIFT - 10),
	       datapages << (PAGE_SHIFT-10), 
	       initpages << (PAGE_SHIFT-10),
	       totalhigh_pages << (PAGE_SHIFT-10));
}

void free_initmem (void)
{
	unsigned long addr;
	unsigned long freed;

	addr = (unsigned long)(&__init_begin);
	freed = (unsigned long)(&__init_end) - addr;
	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
		struct page *p;

		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
		p = virt_to_page(addr);

		ClearPageReserved(p);
		init_page_count(p);
		__free_page(p);
		totalram_pages++;
		num_physpages++;
	}
	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
		freed >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (start < end)
		printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
			(end - start) >> 10);
	for (; start < end; start += PAGE_SIZE) {
		struct page *p;

		memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
		p = virt_to_page(start);

		ClearPageReserved(p);
		init_page_count(p);
		__free_page(p);
		totalram_pages++;
		num_physpages++;
	}
}
#endif

void sparc_flush_page_to_ram(struct page *page)
{
	unsigned long vaddr = (unsigned long)page_address(page);

	if (vaddr)
		__flush_page_to_ram(vaddr);
}
EXPORT_SYMBOL(sparc_flush_page_to_ram);
Commit	Line	Data
88278ca2	1	/*
1da177e4 LT	2	* linux/arch/sparc/mm/init.c
	3	*
	4	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
	6	* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	7	* Copyright (C) 2000 Anton Blanchard (anton@samba.org)
	8	*/
	9
1da177e4 LT	10	#include <linux/module.h>
	11	#include <linux/signal.h>
	12	#include <linux/sched.h>
	13	#include <linux/kernel.h>
	14	#include <linux/errno.h>
	15	#include <linux/string.h>
	16	#include <linux/types.h>
	17	#include <linux/ptrace.h>
	18	#include <linux/mman.h>
	19	#include <linux/mm.h>
	20	#include <linux/swap.h>
	21	#include <linux/initrd.h>
	22	#include <linux/init.h>
	23	#include <linux/highmem.h>
	24	#include <linux/bootmem.h>
f538f3df	25	#include <linux/pagemap.h>
1aa0365f	26	#include <linux/poison.h>
5a0e3ad6	27	#include <linux/gfp.h>
1da177e4	28
86ed40bd	29	#include <asm/sections.h>
1da177e4 LT	30	#include <asm/page.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/vaddrs.h>
	33	#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
	34	#include <asm/tlb.h>
942a6bdd	35	#include <asm/prom.h>
0fd7ef1f	36	#include <asm/leon.h>
1da177e4	37
1da177e4	38	unsigned long *sparc_valid_addr_bitmap;
6943f3da	39	EXPORT_SYMBOL(sparc_valid_addr_bitmap);
1da177e4 LT	40
1da177e4 LT	41	unsigned long phys_base;
6943f3da SR	42	EXPORT_SYMBOL(phys_base);
6943f3da SR	43
1da177e4	44	unsigned long pfn_base;
6943f3da	45	EXPORT_SYMBOL(pfn_base);
1da177e4 LT	46
1da177e4 LT	47	unsigned long page_kernel;
6943f3da	48	EXPORT_SYMBOL(page_kernel);
1da177e4 LT	49
	50	struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
	51	unsigned long sparc_unmapped_base;
	52
	53	struct pgtable_cache_struct pgt_quicklists;
	54
1da177e4 LT	55	/* Initial ramdisk setup */
	56	extern unsigned int sparc_ramdisk_image;
	57	extern unsigned int sparc_ramdisk_size;
	58
	59	unsigned long highstart_pfn, highend_pfn;
	60
	61	pte_t *kmap_pte;
	62	pgprot_t kmap_prot;
	63
	64	#define kmap_get_fixmap_pte(vaddr) \
	65	pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
	66
	67	void __init kmap_init(void)
	68	{
	69	/* cache the first kmap pte */
	70	kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
	71	kmap_prot = __pgprot(SRMMU_ET_PTE \| SRMMU_PRIV \| SRMMU_CACHE);
	72	}
	73
b2b755b5	74	void show_mem(unsigned int filter)
1da177e4 LT	75	{
1da177e4 LT	76	printk("Mem-info:\n");
7bf02ea2	77	show_free_areas(filter);
1da177e4 LT	78	printk("Free swap: %6ldkB\n",
	79	nr_swap_pages << (PAGE_SHIFT-10));
	80	printk("%ld pages of RAM\n", totalram_pages);
f0f0d0c6	81	printk("%ld free pages\n", nr_free_pages());
1da177e4 LT	82	#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
	83	printk("%ld pages in page table cache\n",pgtable_cache_size);
	84	#ifndef CONFIG_SMP
	85	if (sparc_cpu_model == sun4m \|\| sparc_cpu_model == sun4d)
	86	printk("%ld entries in page dir cache\n",pgd_cache_size);
	87	#endif
	88	#endif
	89	}
	90
	91	void __init sparc_context_init(int numctx)
	92	{
	93	int ctx;
	94
	95	ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
	96
	97	for(ctx = 0; ctx < numctx; ctx++) {
	98	struct ctx_list *clist;
	99
	100	clist = (ctx_list_pool + ctx);
	101	clist->ctx_number = ctx;
	102	clist->ctx_mm = NULL;
	103	}
	104	ctx_free.next = ctx_free.prev = &ctx_free;
	105	ctx_used.next = ctx_used.prev = &ctx_used;
	106	for(ctx = 0; ctx < numctx; ctx++)
	107	add_to_free_ctxlist(ctx_list_pool + ctx);
	108	}
	109
	110	extern unsigned long cmdline_memory_size;
	111	unsigned long last_valid_pfn;
	112
	113	unsigned long calc_highpages(void)
	114	{
	115	int i;
	116	int nr = 0;
	117
	118	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	119	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	120	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	121
	122	if (end_pfn <= max_low_pfn)
	123	continue;
	124
	125	if (start_pfn < max_low_pfn)
	126	start_pfn = max_low_pfn;
	127
	128	nr += end_pfn - start_pfn;
	129	}
	130
	131	return nr;
	132	}
	133
50215d65	134	static unsigned long calc_max_low_pfn(void)
1da177e4 LT	135	{
	136	int i;
	137	unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
	138	unsigned long curr_pfn, last_pfn;
	139
	140	last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
	141	for (i = 1; sp_banks[i].num_bytes != 0; i++) {
	142	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	143
	144	if (curr_pfn >= tmp) {
	145	if (last_pfn < tmp)
	146	tmp = last_pfn;
	147	break;
	148	}
	149
	150	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	151	}
	152
	153	return tmp;
	154	}
	155
	156	unsigned long __init bootmem_init(unsigned long *pages_avail)
	157	{
	158	unsigned long bootmap_size, start_pfn;
	159	unsigned long end_of_phys_memory = 0UL;
	160	unsigned long bootmap_pfn, bytes_avail, size;
	161	int i;
	162
	163	bytes_avail = 0UL;
	164	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	165	end_of_phys_memory = sp_banks[i].base_addr +
	166	sp_banks[i].num_bytes;
	167	bytes_avail += sp_banks[i].num_bytes;
	168	if (cmdline_memory_size) {
	169	if (bytes_avail > cmdline_memory_size) {
	170	unsigned long slack = bytes_avail - cmdline_memory_size;
	171
	172	bytes_avail -= slack;
	173	end_of_phys_memory -= slack;
	174
	175	sp_banks[i].num_bytes -= slack;
	176	if (sp_banks[i].num_bytes == 0) {
	177	sp_banks[i].base_addr = 0xdeadbeef;
	178	} else {
	179	sp_banks[i+1].num_bytes = 0;
	180	sp_banks[i+1].base_addr = 0xdeadbeef;
	181	}
	182	break;
	183	}
	184	}
	185	}
	186
	187	/* Start with page aligned address of last symbol in kernel
	188	* image.
	189	*/
	190	start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
	191
	192	/* Now shift down to get the real physical page frame number. */
	193	start_pfn >>= PAGE_SHIFT;
	194
	195	bootmap_pfn = start_pfn;
	196
	197	max_pfn = end_of_phys_memory >> PAGE_SHIFT;
	198
199	max_low_pfn = max_pfn;
200	highstart_pfn = highend_pfn = max_pfn;
201
202	if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
203	highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
204	max_low_pfn = calc_max_low_pfn();
205	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
206	calc_highpages() >> (20 - PAGE_SHIFT));
207	}
208
209	#ifdef CONFIG_BLK_DEV_INITRD
210	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
211	if (sparc_ramdisk_image) {
efb89630 DM	212	if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
efb89630 DM	213	sparc_ramdisk_image -= KERNBASE;
1da177e4 LT	214	initrd_start = sparc_ramdisk_image + phys_base;
	215	initrd_end = initrd_start + sparc_ramdisk_size;
	216	if (initrd_end > end_of_phys_memory) {
	217	printk(KERN_CRIT "initrd extends beyond end of memory "
	218	"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
	219	initrd_end, end_of_phys_memory);
	220	initrd_start = 0;
	221	}
	222	if (initrd_start) {
	223	if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
	224	initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
	225	bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
	226	}
	227	}
	228	#endif
	229	/* Initialize the boot-time allocator. */
	230	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
	231	max_low_pfn);
	232
	233	/* Now register the available physical memory with the
	234	* allocator.
	235	*/
	236	*pages_avail = 0;
	237	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	238	unsigned long curr_pfn, last_pfn;
	239
	240	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	241	if (curr_pfn >= max_low_pfn)
	242	break;
	243
	244	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	245	if (last_pfn > max_low_pfn)
	246	last_pfn = max_low_pfn;
	247
	248	/*
	249	* .. finally, did all the rounding and playing
	250	* around just make the area go away?
	251	*/
	252	if (last_pfn <= curr_pfn)
	253	continue;
	254
	255	size = (last_pfn - curr_pfn) << PAGE_SHIFT;
	256	*pages_avail += last_pfn - curr_pfn;
	257
	258	free_bootmem(sp_banks[i].base_addr, size);
	259	}
	260
	261	#ifdef CONFIG_BLK_DEV_INITRD
	262	if (initrd_start) {
	263	/* Reserve the initrd image area. */
	264	size = initrd_end - initrd_start;
72a7fe39	265	reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
1da177e4 LT	266	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	267
	268	initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
	269	initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
	270	}
	271	#endif
	272	/* Reserve the kernel text/data/bss. */
	273	size = (start_pfn << PAGE_SHIFT) - phys_base;
72a7fe39	274	reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
1da177e4 LT	275	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	276
	277	/* Reserve the bootmem map. We do not account for it
	278	* in pages_avail because we will release that memory
	279	* in free_all_bootmem.
	280	*/
	281	size = bootmap_size;
72a7fe39	282	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
1da177e4 LT	283	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	284
	285	return max_pfn;
	286	}
	287
	288	/*
	289	* check_pgt_cache
	290	*
	291	* This is called at the end of unmapping of VMA (zap_page_range),
ee906c9e DM	292	* to rescan the page cache for architecture specific things.
ee906c9e DM	293	* Most architectures define check_pgt_cache empty.
1da177e4 LT	294	*
	295	* We simply copy the 2.4 implementation for now.
	296	*/
50215d65	297	static int pgt_cache_water[2] = { 25, 50 };
1da177e4 LT	298
	299	void check_pgt_cache(void)
	300	{
	301	do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
	302	}
	303
	304	/*
	305	* paging_init() sets up the page tables: We call the MMU specific
	306	* init routine based upon the Sun model type on the Sparc.
	307	*
	308	*/
1da177e4 LT	309	extern void srmmu_paging_init(void);
	310	extern void device_scan(void);
	311
378e515c AV	312	pgprot_t PAGE_SHARED __read_mostly;
	313	EXPORT_SYMBOL(PAGE_SHARED);
	314
1da177e4 LT	315	void __init paging_init(void)
	316	{
	317	switch(sparc_cpu_model) {
0fd7ef1f KE	318	case sparc_leon:
	319	leon_init();
	320	/* fall through */
1da177e4 LT	321	case sun4m:
	322	case sun4d:
	323	srmmu_paging_init();
	324	sparc_unmapped_base = 0x50000000;
	325	BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
	326	break;
	327	default:
	328	prom_printf("paging_init: Cannot init paging on this Sparc\n");
	329	prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
	330	prom_printf("paging_init: Halting...\n");
	331	prom_halt();
6cb79b3f	332	}
1da177e4 LT	333
	334	/* Initialize the protection map with non-constant, MMU dependent values. */
	335	protection_map[0] = PAGE_NONE;
	336	protection_map[1] = PAGE_READONLY;
	337	protection_map[2] = PAGE_COPY;
	338	protection_map[3] = PAGE_COPY;
	339	protection_map[4] = PAGE_READONLY;
	340	protection_map[5] = PAGE_READONLY;
	341	protection_map[6] = PAGE_COPY;
	342	protection_map[7] = PAGE_COPY;
	343	protection_map[8] = PAGE_NONE;
	344	protection_map[9] = PAGE_READONLY;
	345	protection_map[10] = PAGE_SHARED;
	346	protection_map[11] = PAGE_SHARED;
	347	protection_map[12] = PAGE_READONLY;
	348	protection_map[13] = PAGE_READONLY;
	349	protection_map[14] = PAGE_SHARED;
	350	protection_map[15] = PAGE_SHARED;
	351	btfixup();
942a6bdd	352	prom_build_devicetree();
890db403	353	of_fill_in_cpu_data();
1da177e4 LT	354	device_scan();
	355	}
	356
1da177e4 LT	357	static void __init taint_real_pages(void)
	358	{
	359	int i;
	360
	361	for (i = 0; sp_banks[i].num_bytes; i++) {
	362	unsigned long start, end;
	363
	364	start = sp_banks[i].base_addr;
	365	end = start + sp_banks[i].num_bytes;
	366
	367	while (start < end) {
	368	set_bit(start >> 20, sparc_valid_addr_bitmap);
	369	start += PAGE_SIZE;
	370	}
	371	}
	372	}
	373
50215d65	374	static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
1da177e4 LT	375	{
	376	unsigned long tmp;
	377
	378	#ifdef CONFIG_DEBUG_HIGHMEM
	379	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
	380	#endif
	381
	382	for (tmp = start_pfn; tmp < end_pfn; tmp++) {
	383	struct page *page = pfn_to_page(tmp);
	384
	385	ClearPageReserved(page);
7835e98b	386	init_page_count(page);
1da177e4 LT	387	__free_page(page);
	388	totalhigh_pages++;
	389	}
	390	}
	391
	392	void __init mem_init(void)
	393	{
	394	int codepages = 0;
	395	int datapages = 0;
	396	int initpages = 0;
	397	int reservedpages = 0;
	398	int i;
	399
	400	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
	401	prom_printf("BUG: fixmap and pkmap areas overlap\n");
	402	prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
	403	PKMAP_BASE,
	404	(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	405	FIXADDR_START);
	406	prom_printf("Please mail sparclinux@vger.kernel.org.\n");
	407	prom_halt();
	408	}
	409
	410
	411	/* Saves us work later. */
	412	memset((void *)&empty_zero_page, 0, PAGE_SIZE);
	413
	414	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	415	i += 1;
	416	sparc_valid_addr_bitmap = (unsigned long *)
	417	__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
	418
	419	if (sparc_valid_addr_bitmap == NULL) {
	420	prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
	421	prom_halt();
	422	}
	423	memset(sparc_valid_addr_bitmap, 0, i << 2);
	424
	425	taint_real_pages();
	426
	427	max_mapnr = last_valid_pfn - pfn_base;
	428	high_memory = __va(max_low_pfn << PAGE_SHIFT);
	429
	430	totalram_pages = free_all_bootmem();
	431
	432	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	433	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	434	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	435
	436	num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
	437
	438	if (end_pfn <= highstart_pfn)
	439	continue;
	440
	441	if (start_pfn < highstart_pfn)
	442	start_pfn = highstart_pfn;
	443
	444	map_high_region(start_pfn, end_pfn);
	445	}
	446
	447	totalram_pages += totalhigh_pages;
	448
86ed40bd	449	codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
1da177e4	450	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
86ed40bd	451	datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
1da177e4 LT	452	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
	453	initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
	454	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
	455
	456	/* Ignore memory holes for the purpose of counting reserved pages */
	457	for (i=0; i < max_low_pfn; i++)
	458	if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
	459	&& PageReserved(pfn_to_page(i)))
	460	reservedpages++;
	461
	462	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
cc013a88	463	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	464	num_physpages << (PAGE_SHIFT - 10),
	465	codepages << (PAGE_SHIFT-10),
	466	reservedpages << (PAGE_SHIFT - 10),
	467	datapages << (PAGE_SHIFT-10),
	468	initpages << (PAGE_SHIFT-10),
	469	totalhigh_pages << (PAGE_SHIFT-10));
	470	}
	471
	472	void free_initmem (void)
	473	{
	474	unsigned long addr;
86ed40bd	475	unsigned long freed;
1da177e4 LT	476
1da177e4 LT	477	addr = (unsigned long)(&__init_begin);
86ed40bd	478	freed = (unsigned long)(&__init_end) - addr;
1da177e4 LT	479	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	480	struct page *p;
	481
1aa0365f	482	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
1da177e4 LT	483	p = virt_to_page(addr);
	484
	485	ClearPageReserved(p);
7835e98b	486	init_page_count(p);
1da177e4 LT	487	__free_page(p);
	488	totalram_pages++;
	489	num_physpages++;
	490	}
86ed40bd SR	491	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
86ed40bd SR	492	freed >> 10);
1da177e4 LT	493	}
	494
	495	#ifdef CONFIG_BLK_DEV_INITRD
	496	void free_initrd_mem(unsigned long start, unsigned long end)
	497	{
	498	if (start < end)
1aa0365f RR	499	printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
1aa0365f RR	500	(end - start) >> 10);
1da177e4	501	for (; start < end; start += PAGE_SIZE) {
1aa0365f RR	502	struct page *p;
	503
	504	memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
	505	p = virt_to_page(start);
1da177e4 LT	506
1da177e4 LT	507	ClearPageReserved(p);
7835e98b	508	init_page_count(p);
1da177e4	509	__free_page(p);
1aa0365f	510	totalram_pages++;
1da177e4 LT	511	num_physpages++;
	512	}
	513	}
	514	#endif
	515
	516	void sparc_flush_page_to_ram(struct page *page)
	517	{
	518	unsigned long vaddr = (unsigned long)page_address(page);
	519
	520	if (vaddr)
	521	__flush_page_to_ram(vaddr);
	522	}
6943f3da	523	EXPORT_SYMBOL(sparc_flush_page_to_ram);