[mirror_ubuntu-bionic-kernel.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/system.h>
#include <asm/vac-ops.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>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

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();
	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,
 * presumably something like sun4/sun4c PMEGs. 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 sun4c_paging_init(void);
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 sun4c:
	case sun4e:
	case sun4:
		sun4c_paging_init();
		sparc_unmapped_base = 0xe0000000;
		BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
		break;
	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	30	#include <asm/system.h>
1da177e4 LT	31	#include <asm/vac-ops.h>
	32	#include <asm/page.h>
	33	#include <asm/pgtable.h>
	34	#include <asm/vaddrs.h>
	35	#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
	36	#include <asm/tlb.h>
942a6bdd	37	#include <asm/prom.h>
0fd7ef1f	38	#include <asm/leon.h>
1da177e4 LT	39
	40	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	41
	42	unsigned long *sparc_valid_addr_bitmap;
6943f3da	43	EXPORT_SYMBOL(sparc_valid_addr_bitmap);
1da177e4 LT	44
1da177e4 LT	45	unsigned long phys_base;
6943f3da SR	46	EXPORT_SYMBOL(phys_base);
6943f3da SR	47
1da177e4	48	unsigned long pfn_base;
6943f3da	49	EXPORT_SYMBOL(pfn_base);
1da177e4 LT	50
1da177e4 LT	51	unsigned long page_kernel;
6943f3da	52	EXPORT_SYMBOL(page_kernel);
1da177e4 LT	53
	54	struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
	55	unsigned long sparc_unmapped_base;
	56
	57	struct pgtable_cache_struct pgt_quicklists;
	58
1da177e4 LT	59	/* Initial ramdisk setup */
	60	extern unsigned int sparc_ramdisk_image;
	61	extern unsigned int sparc_ramdisk_size;
	62
	63	unsigned long highstart_pfn, highend_pfn;
	64
	65	pte_t *kmap_pte;
	66	pgprot_t kmap_prot;
	67
	68	#define kmap_get_fixmap_pte(vaddr) \
	69	pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
	70
	71	void __init kmap_init(void)
	72	{
	73	/* cache the first kmap pte */
	74	kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
	75	kmap_prot = __pgprot(SRMMU_ET_PTE \| SRMMU_PRIV \| SRMMU_CACHE);
	76	}
	77
b2b755b5	78	void show_mem(unsigned int filter)
1da177e4 LT	79	{
	80	printk("Mem-info:\n");
	81	show_free_areas();
	82	printk("Free swap: %6ldkB\n",
	83	nr_swap_pages << (PAGE_SHIFT-10));
	84	printk("%ld pages of RAM\n", totalram_pages);
f0f0d0c6	85	printk("%ld free pages\n", nr_free_pages());
1da177e4 LT	86	#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
	87	printk("%ld pages in page table cache\n",pgtable_cache_size);
	88	#ifndef CONFIG_SMP
	89	if (sparc_cpu_model == sun4m \|\| sparc_cpu_model == sun4d)
	90	printk("%ld entries in page dir cache\n",pgd_cache_size);
	91	#endif
	92	#endif
	93	}
	94
	95	void __init sparc_context_init(int numctx)
	96	{
	97	int ctx;
	98
	99	ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
	100
	101	for(ctx = 0; ctx < numctx; ctx++) {
	102	struct ctx_list *clist;
	103
	104	clist = (ctx_list_pool + ctx);
	105	clist->ctx_number = ctx;
	106	clist->ctx_mm = NULL;
	107	}
	108	ctx_free.next = ctx_free.prev = &ctx_free;
	109	ctx_used.next = ctx_used.prev = &ctx_used;
	110	for(ctx = 0; ctx < numctx; ctx++)
	111	add_to_free_ctxlist(ctx_list_pool + ctx);
	112	}
	113
	114	extern unsigned long cmdline_memory_size;
	115	unsigned long last_valid_pfn;
	116
	117	unsigned long calc_highpages(void)
	118	{
	119	int i;
	120	int nr = 0;
	121
	122	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	123	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	124	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	125
	126	if (end_pfn <= max_low_pfn)
	127	continue;
	128
	129	if (start_pfn < max_low_pfn)
	130	start_pfn = max_low_pfn;
	131
	132	nr += end_pfn - start_pfn;
	133	}
	134
	135	return nr;
	136	}
	137
50215d65	138	static unsigned long calc_max_low_pfn(void)
1da177e4 LT	139	{
	140	int i;
	141	unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
	142	unsigned long curr_pfn, last_pfn;
	143
	144	last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
	145	for (i = 1; sp_banks[i].num_bytes != 0; i++) {
	146	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	147
	148	if (curr_pfn >= tmp) {
	149	if (last_pfn < tmp)
	150	tmp = last_pfn;
	151	break;
	152	}
	153
	154	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	155	}
	156
	157	return tmp;
	158	}
	159
	160	unsigned long __init bootmem_init(unsigned long *pages_avail)
	161	{
	162	unsigned long bootmap_size, start_pfn;
	163	unsigned long end_of_phys_memory = 0UL;
	164	unsigned long bootmap_pfn, bytes_avail, size;
	165	int i;
	166
	167	bytes_avail = 0UL;
	168	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	169	end_of_phys_memory = sp_banks[i].base_addr +
	170	sp_banks[i].num_bytes;
	171	bytes_avail += sp_banks[i].num_bytes;
	172	if (cmdline_memory_size) {
	173	if (bytes_avail > cmdline_memory_size) {
	174	unsigned long slack = bytes_avail - cmdline_memory_size;
	175
	176	bytes_avail -= slack;
	177	end_of_phys_memory -= slack;
	178
	179	sp_banks[i].num_bytes -= slack;
	180	if (sp_banks[i].num_bytes == 0) {
	181	sp_banks[i].base_addr = 0xdeadbeef;
	182	} else {
	183	sp_banks[i+1].num_bytes = 0;
	184	sp_banks[i+1].base_addr = 0xdeadbeef;
	185	}
	186	break;
	187	}
	188	}
	189	}
	190
	191	/* Start with page aligned address of last symbol in kernel
	192	* image.
	193	*/
	194	start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
	195
	196	/* Now shift down to get the real physical page frame number. */
	197	start_pfn >>= PAGE_SHIFT;
	198
	199	bootmap_pfn = start_pfn;
	200
	201	max_pfn = end_of_phys_memory >> PAGE_SHIFT;
	202
203	max_low_pfn = max_pfn;
204	highstart_pfn = highend_pfn = max_pfn;
205
206	if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
207	highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
208	max_low_pfn = calc_max_low_pfn();
209	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
210	calc_highpages() >> (20 - PAGE_SHIFT));
211	}
212
213	#ifdef CONFIG_BLK_DEV_INITRD
214	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
215	if (sparc_ramdisk_image) {
efb89630 DM	216	if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
efb89630 DM	217	sparc_ramdisk_image -= KERNBASE;
1da177e4 LT	218	initrd_start = sparc_ramdisk_image + phys_base;
	219	initrd_end = initrd_start + sparc_ramdisk_size;
	220	if (initrd_end > end_of_phys_memory) {
	221	printk(KERN_CRIT "initrd extends beyond end of memory "
	222	"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
	223	initrd_end, end_of_phys_memory);
	224	initrd_start = 0;
	225	}
	226	if (initrd_start) {
	227	if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
	228	initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
	229	bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
	230	}
	231	}
	232	#endif
	233	/* Initialize the boot-time allocator. */
	234	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
	235	max_low_pfn);
	236
	237	/* Now register the available physical memory with the
	238	* allocator.
	239	*/
	240	*pages_avail = 0;
	241	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	242	unsigned long curr_pfn, last_pfn;
	243
	244	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	245	if (curr_pfn >= max_low_pfn)
	246	break;
	247
	248	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	249	if (last_pfn > max_low_pfn)
	250	last_pfn = max_low_pfn;
	251
	252	/*
	253	* .. finally, did all the rounding and playing
	254	* around just make the area go away?
	255	*/
	256	if (last_pfn <= curr_pfn)
	257	continue;
	258
	259	size = (last_pfn - curr_pfn) << PAGE_SHIFT;
	260	*pages_avail += last_pfn - curr_pfn;
	261
	262	free_bootmem(sp_banks[i].base_addr, size);
	263	}
	264
	265	#ifdef CONFIG_BLK_DEV_INITRD
	266	if (initrd_start) {
	267	/* Reserve the initrd image area. */
	268	size = initrd_end - initrd_start;
72a7fe39	269	reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
1da177e4 LT	270	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	271
	272	initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
	273	initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
	274	}
	275	#endif
	276	/* Reserve the kernel text/data/bss. */
	277	size = (start_pfn << PAGE_SHIFT) - phys_base;
72a7fe39	278	reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
1da177e4 LT	279	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	280
	281	/* Reserve the bootmem map. We do not account for it
	282	* in pages_avail because we will release that memory
	283	* in free_all_bootmem.
	284	*/
	285	size = bootmap_size;
72a7fe39	286	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
1da177e4 LT	287	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	288
	289	return max_pfn;
	290	}
	291
	292	/*
	293	* check_pgt_cache
	294	*
	295	* This is called at the end of unmapping of VMA (zap_page_range),
	296	* to rescan the page cache for architecture specific things,
	297	* presumably something like sun4/sun4c PMEGs. Most architectures
	298	* define check_pgt_cache empty.
	299	*
	300	* We simply copy the 2.4 implementation for now.
	301	*/
50215d65	302	static int pgt_cache_water[2] = { 25, 50 };
1da177e4 LT	303
	304	void check_pgt_cache(void)
	305	{
	306	do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
	307	}
	308
	309	/*
	310	* paging_init() sets up the page tables: We call the MMU specific
	311	* init routine based upon the Sun model type on the Sparc.
	312	*
	313	*/
	314	extern void sun4c_paging_init(void);
	315	extern void srmmu_paging_init(void);
	316	extern void device_scan(void);
	317
378e515c AV	318	pgprot_t PAGE_SHARED __read_mostly;
	319	EXPORT_SYMBOL(PAGE_SHARED);
	320
1da177e4 LT	321	void __init paging_init(void)
	322	{
	323	switch(sparc_cpu_model) {
	324	case sun4c:
	325	case sun4e:
	326	case sun4:
	327	sun4c_paging_init();
	328	sparc_unmapped_base = 0xe0000000;
	329	BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
	330	break;
0fd7ef1f KE	331	case sparc_leon:
	332	leon_init();
	333	/* fall through */
1da177e4 LT	334	case sun4m:
	335	case sun4d:
	336	srmmu_paging_init();
	337	sparc_unmapped_base = 0x50000000;
	338	BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
	339	break;
	340	default:
	341	prom_printf("paging_init: Cannot init paging on this Sparc\n");
	342	prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
	343	prom_printf("paging_init: Halting...\n");
	344	prom_halt();
	345	};
	346
	347	/* Initialize the protection map with non-constant, MMU dependent values. */
	348	protection_map[0] = PAGE_NONE;
	349	protection_map[1] = PAGE_READONLY;
	350	protection_map[2] = PAGE_COPY;
	351	protection_map[3] = PAGE_COPY;
	352	protection_map[4] = PAGE_READONLY;
	353	protection_map[5] = PAGE_READONLY;
	354	protection_map[6] = PAGE_COPY;
	355	protection_map[7] = PAGE_COPY;
	356	protection_map[8] = PAGE_NONE;
	357	protection_map[9] = PAGE_READONLY;
	358	protection_map[10] = PAGE_SHARED;
	359	protection_map[11] = PAGE_SHARED;
	360	protection_map[12] = PAGE_READONLY;
	361	protection_map[13] = PAGE_READONLY;
	362	protection_map[14] = PAGE_SHARED;
	363	protection_map[15] = PAGE_SHARED;
	364	btfixup();
942a6bdd	365	prom_build_devicetree();
890db403	366	of_fill_in_cpu_data();
1da177e4 LT	367	device_scan();
	368	}
	369
1da177e4 LT	370	static void __init taint_real_pages(void)
	371	{
	372	int i;
	373
	374	for (i = 0; sp_banks[i].num_bytes; i++) {
	375	unsigned long start, end;
	376
	377	start = sp_banks[i].base_addr;
	378	end = start + sp_banks[i].num_bytes;
	379
	380	while (start < end) {
	381	set_bit(start >> 20, sparc_valid_addr_bitmap);
	382	start += PAGE_SIZE;
	383	}
	384	}
	385	}
	386
50215d65	387	static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
1da177e4 LT	388	{
	389	unsigned long tmp;
	390
	391	#ifdef CONFIG_DEBUG_HIGHMEM
	392	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
	393	#endif
	394
	395	for (tmp = start_pfn; tmp < end_pfn; tmp++) {
	396	struct page *page = pfn_to_page(tmp);
	397
	398	ClearPageReserved(page);
7835e98b	399	init_page_count(page);
1da177e4 LT	400	__free_page(page);
	401	totalhigh_pages++;
	402	}
	403	}
	404
	405	void __init mem_init(void)
	406	{
	407	int codepages = 0;
	408	int datapages = 0;
	409	int initpages = 0;
	410	int reservedpages = 0;
	411	int i;
	412
	413	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
	414	prom_printf("BUG: fixmap and pkmap areas overlap\n");
	415	prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
	416	PKMAP_BASE,
	417	(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	418	FIXADDR_START);
	419	prom_printf("Please mail sparclinux@vger.kernel.org.\n");
	420	prom_halt();
	421	}
	422
	423
	424	/* Saves us work later. */
	425	memset((void *)&empty_zero_page, 0, PAGE_SIZE);
	426
	427	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	428	i += 1;
	429	sparc_valid_addr_bitmap = (unsigned long *)
	430	__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
	431
	432	if (sparc_valid_addr_bitmap == NULL) {
	433	prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
	434	prom_halt();
	435	}
	436	memset(sparc_valid_addr_bitmap, 0, i << 2);
	437
	438	taint_real_pages();
	439
	440	max_mapnr = last_valid_pfn - pfn_base;
	441	high_memory = __va(max_low_pfn << PAGE_SHIFT);
	442
	443	totalram_pages = free_all_bootmem();
	444
	445	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	446	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	447	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	448
	449	num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
	450
	451	if (end_pfn <= highstart_pfn)
	452	continue;
	453
	454	if (start_pfn < highstart_pfn)
	455	start_pfn = highstart_pfn;
	456
	457	map_high_region(start_pfn, end_pfn);
	458	}
	459
	460	totalram_pages += totalhigh_pages;
	461
86ed40bd	462	codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
1da177e4	463	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
86ed40bd	464	datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
1da177e4 LT	465	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
	466	initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
	467	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
	468
	469	/* Ignore memory holes for the purpose of counting reserved pages */
	470	for (i=0; i < max_low_pfn; i++)
	471	if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
	472	&& PageReserved(pfn_to_page(i)))
	473	reservedpages++;
	474
	475	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
cc013a88	476	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	477	num_physpages << (PAGE_SHIFT - 10),
	478	codepages << (PAGE_SHIFT-10),
	479	reservedpages << (PAGE_SHIFT - 10),
	480	datapages << (PAGE_SHIFT-10),
	481	initpages << (PAGE_SHIFT-10),
	482	totalhigh_pages << (PAGE_SHIFT-10));
	483	}
	484
	485	void free_initmem (void)
	486	{
	487	unsigned long addr;
86ed40bd	488	unsigned long freed;
1da177e4 LT	489
1da177e4 LT	490	addr = (unsigned long)(&__init_begin);
86ed40bd	491	freed = (unsigned long)(&__init_end) - addr;
1da177e4 LT	492	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	493	struct page *p;
	494
1aa0365f	495	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
1da177e4 LT	496	p = virt_to_page(addr);
	497
	498	ClearPageReserved(p);
7835e98b	499	init_page_count(p);
1da177e4 LT	500	__free_page(p);
	501	totalram_pages++;
	502	num_physpages++;
	503	}
86ed40bd SR	504	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
86ed40bd SR	505	freed >> 10);
1da177e4 LT	506	}
	507
	508	#ifdef CONFIG_BLK_DEV_INITRD
	509	void free_initrd_mem(unsigned long start, unsigned long end)
	510	{
	511	if (start < end)
1aa0365f RR	512	printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
1aa0365f RR	513	(end - start) >> 10);
1da177e4	514	for (; start < end; start += PAGE_SIZE) {
1aa0365f RR	515	struct page *p;
	516
	517	memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
	518	p = virt_to_page(start);
1da177e4 LT	519
1da177e4 LT	520	ClearPageReserved(p);
7835e98b	521	init_page_count(p);
1da177e4	522	__free_page(p);
1aa0365f	523	totalram_pages++;
1da177e4 LT	524	num_physpages++;
	525	}
	526	}
	527	#endif
	528
	529	void sparc_flush_page_to_ram(struct page *page)
	530	{
	531	unsigned long vaddr = (unsigned long)page_address(page);
	532
	533	if (vaddr)
	534	__flush_page_to_ram(vaddr);
	535	}
6943f3da	536	EXPORT_SYMBOL(sparc_flush_page_to_ram);