[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);

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;
}

/*
 * 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);

void __init paging_init(void)
{
	switch(sparc_cpu_model) {
	case sparc_leon:
	case sun4m:
	case sun4d:
		srmmu_paging_init();
		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();
	}

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