[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/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];

/* 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
}


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)
{
	srmmu_paging_init();
	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	47	struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
1da177e4	48
1da177e4 LT	49	/* Initial ramdisk setup */
	50	extern unsigned int sparc_ramdisk_image;
	51	extern unsigned int sparc_ramdisk_size;
	52
	53	unsigned long highstart_pfn, highend_pfn;
	54
	55	pte_t *kmap_pte;
	56	pgprot_t kmap_prot;
	57
	58	#define kmap_get_fixmap_pte(vaddr) \
	59	pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
	60
	61	void __init kmap_init(void)
	62	{
	63	/* cache the first kmap pte */
	64	kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
	65	kmap_prot = __pgprot(SRMMU_ET_PTE \| SRMMU_PRIV \| SRMMU_CACHE);
	66	}
	67
b2b755b5	68	void show_mem(unsigned int filter)
1da177e4 LT	69	{
1da177e4 LT	70	printk("Mem-info:\n");
7bf02ea2	71	show_free_areas(filter);
1da177e4 LT	72	printk("Free swap: %6ldkB\n",
	73	nr_swap_pages << (PAGE_SHIFT-10));
	74	printk("%ld pages of RAM\n", totalram_pages);
f0f0d0c6	75	printk("%ld free pages\n", nr_free_pages());
1da177e4 LT	76	#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
	77	printk("%ld pages in page table cache\n",pgtable_cache_size);
	78	#ifndef CONFIG_SMP
	79	if (sparc_cpu_model == sun4m \|\| sparc_cpu_model == sun4d)
	80	printk("%ld entries in page dir cache\n",pgd_cache_size);
	81	#endif
	82	#endif
	83	}
	84
1da177e4 LT	85
	86	extern unsigned long cmdline_memory_size;
	87	unsigned long last_valid_pfn;
	88
	89	unsigned long calc_highpages(void)
	90	{
	91	int i;
	92	int nr = 0;
	93
	94	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	95	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	96	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	97
	98	if (end_pfn <= max_low_pfn)
	99	continue;
	100
	101	if (start_pfn < max_low_pfn)
	102	start_pfn = max_low_pfn;
	103
	104	nr += end_pfn - start_pfn;
	105	}
	106
	107	return nr;
	108	}
	109
50215d65	110	static unsigned long calc_max_low_pfn(void)
1da177e4 LT	111	{
	112	int i;
	113	unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
	114	unsigned long curr_pfn, last_pfn;
	115
	116	last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
	117	for (i = 1; sp_banks[i].num_bytes != 0; i++) {
	118	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	119
	120	if (curr_pfn >= tmp) {
	121	if (last_pfn < tmp)
	122	tmp = last_pfn;
	123	break;
	124	}
	125
	126	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	127	}
	128
	129	return tmp;
	130	}
	131
	132	unsigned long __init bootmem_init(unsigned long *pages_avail)
	133	{
	134	unsigned long bootmap_size, start_pfn;
	135	unsigned long end_of_phys_memory = 0UL;
	136	unsigned long bootmap_pfn, bytes_avail, size;
	137	int i;
	138
	139	bytes_avail = 0UL;
	140	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	141	end_of_phys_memory = sp_banks[i].base_addr +
	142	sp_banks[i].num_bytes;
	143	bytes_avail += sp_banks[i].num_bytes;
	144	if (cmdline_memory_size) {
	145	if (bytes_avail > cmdline_memory_size) {
	146	unsigned long slack = bytes_avail - cmdline_memory_size;
	147
	148	bytes_avail -= slack;
	149	end_of_phys_memory -= slack;
	150
	151	sp_banks[i].num_bytes -= slack;
	152	if (sp_banks[i].num_bytes == 0) {
	153	sp_banks[i].base_addr = 0xdeadbeef;
	154	} else {
	155	sp_banks[i+1].num_bytes = 0;
	156	sp_banks[i+1].base_addr = 0xdeadbeef;
	157	}
	158	break;
	159	}
	160	}
	161	}
	162
	163	/* Start with page aligned address of last symbol in kernel
	164	* image.
	165	*/
	166	start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
	167
	168	/* Now shift down to get the real physical page frame number. */
	169	start_pfn >>= PAGE_SHIFT;
	170
	171	bootmap_pfn = start_pfn;
	172
	173	max_pfn = end_of_phys_memory >> PAGE_SHIFT;
	174
175	max_low_pfn = max_pfn;
176	highstart_pfn = highend_pfn = max_pfn;
177
178	if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
179	highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
180	max_low_pfn = calc_max_low_pfn();
181	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
182	calc_highpages() >> (20 - PAGE_SHIFT));
183	}
184
185	#ifdef CONFIG_BLK_DEV_INITRD
186	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
187	if (sparc_ramdisk_image) {
efb89630 DM	188	if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
efb89630 DM	189	sparc_ramdisk_image -= KERNBASE;
1da177e4 LT	190	initrd_start = sparc_ramdisk_image + phys_base;
	191	initrd_end = initrd_start + sparc_ramdisk_size;
	192	if (initrd_end > end_of_phys_memory) {
	193	printk(KERN_CRIT "initrd extends beyond end of memory "
	194	"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
	195	initrd_end, end_of_phys_memory);
	196	initrd_start = 0;
	197	}
	198	if (initrd_start) {
	199	if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
	200	initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
	201	bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
	202	}
	203	}
	204	#endif
	205	/* Initialize the boot-time allocator. */
	206	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
	207	max_low_pfn);
	208
	209	/* Now register the available physical memory with the
	210	* allocator.
	211	*/
	212	*pages_avail = 0;
	213	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	214	unsigned long curr_pfn, last_pfn;
	215
	216	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	217	if (curr_pfn >= max_low_pfn)
	218	break;
	219
	220	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	221	if (last_pfn > max_low_pfn)
	222	last_pfn = max_low_pfn;
	223
	224	/*
	225	* .. finally, did all the rounding and playing
	226	* around just make the area go away?
	227	*/
	228	if (last_pfn <= curr_pfn)
	229	continue;
	230
	231	size = (last_pfn - curr_pfn) << PAGE_SHIFT;
	232	*pages_avail += last_pfn - curr_pfn;
	233
	234	free_bootmem(sp_banks[i].base_addr, size);
	235	}
	236
	237	#ifdef CONFIG_BLK_DEV_INITRD
	238	if (initrd_start) {
	239	/* Reserve the initrd image area. */
	240	size = initrd_end - initrd_start;
72a7fe39	241	reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
1da177e4 LT	242	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	243
	244	initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
	245	initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
	246	}
	247	#endif
	248	/* Reserve the kernel text/data/bss. */
	249	size = (start_pfn << PAGE_SHIFT) - phys_base;
72a7fe39	250	reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
1da177e4 LT	251	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	252
	253	/* Reserve the bootmem map. We do not account for it
	254	* in pages_avail because we will release that memory
	255	* in free_all_bootmem.
	256	*/
	257	size = bootmap_size;
72a7fe39	258	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
1da177e4 LT	259	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	260
	261	return max_pfn;
	262	}
	263
1da177e4 LT	264	/*
	265	* paging_init() sets up the page tables: We call the MMU specific
	266	* init routine based upon the Sun model type on the Sparc.
	267	*
	268	*/
1da177e4 LT	269	extern void srmmu_paging_init(void);
	270	extern void device_scan(void);
	271
	272	void __init paging_init(void)
	273	{
cc52aea9	274	srmmu_paging_init();
942a6bdd	275	prom_build_devicetree();
890db403	276	of_fill_in_cpu_data();
1da177e4 LT	277	device_scan();
	278	}
	279
1da177e4 LT	280	static void __init taint_real_pages(void)
	281	{
	282	int i;
	283
	284	for (i = 0; sp_banks[i].num_bytes; i++) {
	285	unsigned long start, end;
	286
	287	start = sp_banks[i].base_addr;
	288	end = start + sp_banks[i].num_bytes;
	289
	290	while (start < end) {
	291	set_bit(start >> 20, sparc_valid_addr_bitmap);
	292	start += PAGE_SIZE;
	293	}
	294	}
	295	}
	296
50215d65	297	static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
1da177e4 LT	298	{
	299	unsigned long tmp;
	300
	301	#ifdef CONFIG_DEBUG_HIGHMEM
	302	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
	303	#endif
	304
	305	for (tmp = start_pfn; tmp < end_pfn; tmp++) {
	306	struct page *page = pfn_to_page(tmp);
	307
	308	ClearPageReserved(page);
7835e98b	309	init_page_count(page);
1da177e4 LT	310	__free_page(page);
	311	totalhigh_pages++;
	312	}
	313	}
	314
	315	void __init mem_init(void)
	316	{
	317	int codepages = 0;
	318	int datapages = 0;
	319	int initpages = 0;
	320	int reservedpages = 0;
	321	int i;
	322
	323	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
	324	prom_printf("BUG: fixmap and pkmap areas overlap\n");
	325	prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
	326	PKMAP_BASE,
	327	(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	328	FIXADDR_START);
	329	prom_printf("Please mail sparclinux@vger.kernel.org.\n");
	330	prom_halt();
	331	}
	332
	333
	334	/* Saves us work later. */
	335	memset((void *)&empty_zero_page, 0, PAGE_SIZE);
	336
	337	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	338	i += 1;
	339	sparc_valid_addr_bitmap = (unsigned long *)
	340	__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
	341
	342	if (sparc_valid_addr_bitmap == NULL) {
	343	prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
	344	prom_halt();
	345	}
	346	memset(sparc_valid_addr_bitmap, 0, i << 2);
	347
	348	taint_real_pages();
	349
	350	max_mapnr = last_valid_pfn - pfn_base;
	351	high_memory = __va(max_low_pfn << PAGE_SHIFT);
	352
	353	totalram_pages = free_all_bootmem();
	354
	355	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	356	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	357	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	358
	359	num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
	360
	361	if (end_pfn <= highstart_pfn)
	362	continue;
	363
	364	if (start_pfn < highstart_pfn)
	365	start_pfn = highstart_pfn;
	366
	367	map_high_region(start_pfn, end_pfn);
	368	}
	369
	370	totalram_pages += totalhigh_pages;
	371
86ed40bd	372	codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
1da177e4	373	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
86ed40bd	374	datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
1da177e4 LT	375	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
	376	initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
	377	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
	378
	379	/* Ignore memory holes for the purpose of counting reserved pages */
	380	for (i=0; i < max_low_pfn; i++)
	381	if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
	382	&& PageReserved(pfn_to_page(i)))
	383	reservedpages++;
	384
	385	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
cc013a88	386	nr_free_pages() << (PAGE_SHIFT-10),
1da177e4 LT	387	num_physpages << (PAGE_SHIFT - 10),
	388	codepages << (PAGE_SHIFT-10),
	389	reservedpages << (PAGE_SHIFT - 10),
	390	datapages << (PAGE_SHIFT-10),
	391	initpages << (PAGE_SHIFT-10),
	392	totalhigh_pages << (PAGE_SHIFT-10));
	393	}
	394
	395	void free_initmem (void)
	396	{
	397	unsigned long addr;
86ed40bd	398	unsigned long freed;
1da177e4 LT	399
1da177e4 LT	400	addr = (unsigned long)(&__init_begin);
86ed40bd	401	freed = (unsigned long)(&__init_end) - addr;
1da177e4 LT	402	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	403	struct page *p;
	404
1aa0365f	405	memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
1da177e4 LT	406	p = virt_to_page(addr);
	407
	408	ClearPageReserved(p);
7835e98b	409	init_page_count(p);
1da177e4 LT	410	__free_page(p);
	411	totalram_pages++;
	412	num_physpages++;
	413	}
86ed40bd SR	414	printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
86ed40bd SR	415	freed >> 10);
1da177e4 LT	416	}
	417
	418	#ifdef CONFIG_BLK_DEV_INITRD
	419	void free_initrd_mem(unsigned long start, unsigned long end)
	420	{
	421	if (start < end)
1aa0365f RR	422	printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
1aa0365f RR	423	(end - start) >> 10);
1da177e4	424	for (; start < end; start += PAGE_SIZE) {
1aa0365f RR	425	struct page *p;
	426
	427	memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
	428	p = virt_to_page(start);
1da177e4 LT	429
1da177e4 LT	430	ClearPageReserved(p);
7835e98b	431	init_page_count(p);
1da177e4	432	__free_page(p);
1aa0365f	433	totalram_pages++;
1da177e4 LT	434	num_physpages++;
	435	}
	436	}
	437	#endif
	438
	439	void sparc_flush_page_to_ram(struct page *page)
	440	{
	441	unsigned long vaddr = (unsigned long)page_address(page);
	442
	443	if (vaddr)
	444	__flush_page_to_ram(vaddr);
	445	}
6943f3da	446	EXPORT_SYMBOL(sparc_flush_page_to_ram);