[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/setup.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/leon.h>

#include "mm_32.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;

void show_mem(unsigned int filter)
{
	printk("Mem-info:\n");
	show_free_areas(filter);
	printk("Free swap:       %6ldkB\n",
	       get_nr_swap_pages() << (PAGE_SHIFT-10));
	printk("%ld pages of RAM\n", totalram_pages);
	printk("%ld free pages\n", nr_free_pages());
}


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.
 *
 */
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++)
		free_highmem_page(pfn_to_page(tmp));
}

void __init mem_init(void)
{
	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);
	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;

		if (end_pfn <= highstart_pfn)
			continue;

		if (start_pfn < highstart_pfn)
			start_pfn = highstart_pfn;

		map_high_region(start_pfn, end_pfn);
	}
	
	mem_init_print_info(NULL);
}

void free_initmem (void)
{
	free_initmem_default(POISON_FREE_INITMEM);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
			   "initrd");
}
#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 */
d191723f	34	#include <asm/setup.h>
1da177e4	35	#include <asm/tlb.h>
942a6bdd	36	#include <asm/prom.h>
0fd7ef1f	37	#include <asm/leon.h>
1da177e4	38
e8c29c83 SR	39	#include "mm_32.h"
e8c29c83 SR	40
1da177e4	41	unsigned long *sparc_valid_addr_bitmap;
6943f3da	42	EXPORT_SYMBOL(sparc_valid_addr_bitmap);
1da177e4 LT	43
1da177e4 LT	44	unsigned long phys_base;
6943f3da SR	45	EXPORT_SYMBOL(phys_base);
6943f3da SR	46
1da177e4	47	unsigned long pfn_base;
6943f3da	48	EXPORT_SYMBOL(pfn_base);
1da177e4	49
1da177e4	50	struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
1da177e4	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
b2b755b5	58	void show_mem(unsigned int filter)
1da177e4 LT	59	{
1da177e4 LT	60	printk("Mem-info:\n");
7bf02ea2	61	show_free_areas(filter);
1da177e4	62	printk("Free swap: %6ldkB\n",
ec8acf20	63	get_nr_swap_pages() << (PAGE_SHIFT-10));
1da177e4	64	printk("%ld pages of RAM\n", totalram_pages);
f0f0d0c6	65	printk("%ld free pages\n", nr_free_pages());
1da177e4 LT	66	}
1da177e4 LT	67
1da177e4	68
1da177e4 LT	69	unsigned long last_valid_pfn;
	70
	71	unsigned long calc_highpages(void)
	72	{
	73	int i;
	74	int nr = 0;
	75
	76	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	77	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	78	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	79
	80	if (end_pfn <= max_low_pfn)
	81	continue;
	82
	83	if (start_pfn < max_low_pfn)
	84	start_pfn = max_low_pfn;
	85
	86	nr += end_pfn - start_pfn;
	87	}
	88
	89	return nr;
	90	}
	91
50215d65	92	static unsigned long calc_max_low_pfn(void)
1da177e4 LT	93	{
	94	int i;
	95	unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
	96	unsigned long curr_pfn, last_pfn;
	97
	98	last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
	99	for (i = 1; sp_banks[i].num_bytes != 0; i++) {
	100	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	101
	102	if (curr_pfn >= tmp) {
	103	if (last_pfn < tmp)
	104	tmp = last_pfn;
	105	break;
	106	}
	107
	108	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	109	}
	110
	111	return tmp;
	112	}
	113
	114	unsigned long __init bootmem_init(unsigned long *pages_avail)
	115	{
	116	unsigned long bootmap_size, start_pfn;
	117	unsigned long end_of_phys_memory = 0UL;
	118	unsigned long bootmap_pfn, bytes_avail, size;
	119	int i;
	120
	121	bytes_avail = 0UL;
	122	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	123	end_of_phys_memory = sp_banks[i].base_addr +
	124	sp_banks[i].num_bytes;
	125	bytes_avail += sp_banks[i].num_bytes;
	126	if (cmdline_memory_size) {
	127	if (bytes_avail > cmdline_memory_size) {
	128	unsigned long slack = bytes_avail - cmdline_memory_size;
	129
	130	bytes_avail -= slack;
	131	end_of_phys_memory -= slack;
	132
	133	sp_banks[i].num_bytes -= slack;
	134	if (sp_banks[i].num_bytes == 0) {
	135	sp_banks[i].base_addr = 0xdeadbeef;
	136	} else {
	137	sp_banks[i+1].num_bytes = 0;
	138	sp_banks[i+1].base_addr = 0xdeadbeef;
	139	}
	140	break;
	141	}
	142	}
	143	}
	144
	145	/* Start with page aligned address of last symbol in kernel
	146	* image.
	147	*/
	148	start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
	149
	150	/* Now shift down to get the real physical page frame number. */
	151	start_pfn >>= PAGE_SHIFT;
	152
	153	bootmap_pfn = start_pfn;
	154
	155	max_pfn = end_of_phys_memory >> PAGE_SHIFT;
	156
157	max_low_pfn = max_pfn;
158	highstart_pfn = highend_pfn = max_pfn;
159
160	if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
161	highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
162	max_low_pfn = calc_max_low_pfn();
163	printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
164	calc_highpages() >> (20 - PAGE_SHIFT));
165	}
166
167	#ifdef CONFIG_BLK_DEV_INITRD
168	/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
169	if (sparc_ramdisk_image) {
efb89630 DM	170	if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
efb89630 DM	171	sparc_ramdisk_image -= KERNBASE;
1da177e4 LT	172	initrd_start = sparc_ramdisk_image + phys_base;
	173	initrd_end = initrd_start + sparc_ramdisk_size;
	174	if (initrd_end > end_of_phys_memory) {
	175	printk(KERN_CRIT "initrd extends beyond end of memory "
	176	"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
	177	initrd_end, end_of_phys_memory);
	178	initrd_start = 0;
	179	}
	180	if (initrd_start) {
	181	if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
	182	initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
	183	bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
	184	}
	185	}
	186	#endif
	187	/* Initialize the boot-time allocator. */
	188	bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
	189	max_low_pfn);
	190
	191	/* Now register the available physical memory with the
	192	* allocator.
	193	*/
	194	*pages_avail = 0;
	195	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	196	unsigned long curr_pfn, last_pfn;
	197
	198	curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	199	if (curr_pfn >= max_low_pfn)
	200	break;
	201
	202	last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	203	if (last_pfn > max_low_pfn)
	204	last_pfn = max_low_pfn;
	205
	206	/*
	207	* .. finally, did all the rounding and playing
	208	* around just make the area go away?
	209	*/
	210	if (last_pfn <= curr_pfn)
	211	continue;
	212
	213	size = (last_pfn - curr_pfn) << PAGE_SHIFT;
	214	*pages_avail += last_pfn - curr_pfn;
	215
	216	free_bootmem(sp_banks[i].base_addr, size);
	217	}
	218
	219	#ifdef CONFIG_BLK_DEV_INITRD
	220	if (initrd_start) {
	221	/* Reserve the initrd image area. */
	222	size = initrd_end - initrd_start;
72a7fe39	223	reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
1da177e4 LT	224	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	225
	226	initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
	227	initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
	228	}
	229	#endif
	230	/* Reserve the kernel text/data/bss. */
	231	size = (start_pfn << PAGE_SHIFT) - phys_base;
72a7fe39	232	reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
1da177e4 LT	233	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	234
	235	/* Reserve the bootmem map. We do not account for it
	236	* in pages_avail because we will release that memory
	237	* in free_all_bootmem.
	238	*/
	239	size = bootmap_size;
72a7fe39	240	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
1da177e4 LT	241	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
	242
	243	return max_pfn;
	244	}
	245
1da177e4 LT	246	/*
	247	* paging_init() sets up the page tables: We call the MMU specific
	248	* init routine based upon the Sun model type on the Sparc.
	249	*
	250	*/
1da177e4 LT	251	void __init paging_init(void)
1da177e4 LT	252	{
cc52aea9	253	srmmu_paging_init();
942a6bdd	254	prom_build_devicetree();
890db403	255	of_fill_in_cpu_data();
1da177e4 LT	256	device_scan();
	257	}
	258
1da177e4 LT	259	static void __init taint_real_pages(void)
	260	{
	261	int i;
	262
	263	for (i = 0; sp_banks[i].num_bytes; i++) {
	264	unsigned long start, end;
	265
	266	start = sp_banks[i].base_addr;
	267	end = start + sp_banks[i].num_bytes;
	268
	269	while (start < end) {
	270	set_bit(start >> 20, sparc_valid_addr_bitmap);
	271	start += PAGE_SIZE;
	272	}
	273	}
	274	}
	275
50215d65	276	static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
1da177e4 LT	277	{
	278	unsigned long tmp;
	279
	280	#ifdef CONFIG_DEBUG_HIGHMEM
	281	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
	282	#endif
	283
32e1a109 JL	284	for (tmp = start_pfn; tmp < end_pfn; tmp++)
32e1a109 JL	285	free_highmem_page(pfn_to_page(tmp));
1da177e4 LT	286	}
	287
	288	void __init mem_init(void)
	289	{
1da177e4 LT	290	int i;
	291
	292	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
	293	prom_printf("BUG: fixmap and pkmap areas overlap\n");
	294	prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
	295	PKMAP_BASE,
	296	(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	297	FIXADDR_START);
	298	prom_printf("Please mail sparclinux@vger.kernel.org.\n");
	299	prom_halt();
	300	}
	301
	302
	303	/* Saves us work later. */
	304	memset((void *)&empty_zero_page, 0, PAGE_SIZE);
	305
	306	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	307	i += 1;
	308	sparc_valid_addr_bitmap = (unsigned long *)
	309	__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
	310
	311	if (sparc_valid_addr_bitmap == NULL) {
	312	prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
	313	prom_halt();
	314	}
	315	memset(sparc_valid_addr_bitmap, 0, i << 2);
	316
	317	taint_real_pages();
	318
	319	max_mapnr = last_valid_pfn - pfn_base;
	320	high_memory = __va(max_low_pfn << PAGE_SHIFT);
0c988534	321	free_all_bootmem();
1da177e4 LT	322
	323	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	324	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	325	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	326
1da177e4 LT	327	if (end_pfn <= highstart_pfn)
	328	continue;
	329
	330	if (start_pfn < highstart_pfn)
	331	start_pfn = highstart_pfn;
	332
	333	map_high_region(start_pfn, end_pfn);
	334	}
	335
dceccbe9	336	mem_init_print_info(NULL);
1da177e4 LT	337	}
	338
	339	void free_initmem (void)
	340	{
dceccbe9	341	free_initmem_default(POISON_FREE_INITMEM);
1da177e4 LT	342	}
	343
	344	#ifdef CONFIG_BLK_DEV_INITRD
	345	void free_initrd_mem(unsigned long start, unsigned long end)
	346	{
dceccbe9 JL	347	free_reserved_area((void )start, (void )end, POISON_FREE_INITMEM,
dceccbe9 JL	348	"initrd");
1da177e4 LT	349	}
	350	#endif
	351
	352	void sparc_flush_page_to_ram(struct page *page)
	353	{
	354	unsigned long vaddr = (unsigned long)page_address(page);
	355
	356	if (vaddr)
	357	__flush_page_to_ram(vaddr);
	358	}
6943f3da	359	EXPORT_SYMBOL(sparc_flush_page_to_ram);