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

/*  $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
 *  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/config.h>
#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 <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>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

unsigned long *sparc_valid_addr_bitmap;

unsigned long phys_base;
unsigned long pfn_base;

unsigned long page_kernel;

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

struct pgtable_cache_struct pgt_quicklists;

/* References to section boundaries */
extern char __init_begin, __init_end, _start, _end, etext , edata;

/* 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(void)
{
	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("%d 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;
}

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);
		*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);
	*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);
	*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.
 */
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);

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 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();
	device_scan();
}

struct cache_palias *sparc_aliases;

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;
		}
	}
}

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);
		set_page_count(page, 1);
		__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",
	       (unsigned long) 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;

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

		p = virt_to_page(addr);

		ClearPageReserved(p);
		set_page_count(p, 1);
		__free_page(p);
		totalram_pages++;
		num_physpages++;
	}
	printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 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 = virt_to_page(start);

		ClearPageReserved(p);
		set_page_count(p, 1);
		__free_page(p);
		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);
}
Commit	Line	Data
1da177e4 LT	1	/* $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
	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
	10	#include <linux/config.h>
	11	#include <linux/module.h>
	12	#include <linux/signal.h>
	13	#include <linux/sched.h>
	14	#include <linux/kernel.h>
	15	#include <linux/errno.h>
	16	#include <linux/string.h>
	17	#include <linux/types.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/mman.h>
	20	#include <linux/mm.h>
	21	#include <linux/swap.h>
	22	#include <linux/initrd.h>
	23	#include <linux/init.h>
	24	#include <linux/highmem.h>
	25	#include <linux/bootmem.h>
	26
	27	#include <asm/system.h>
1da177e4 LT	28	#include <asm/vac-ops.h>
	29	#include <asm/page.h>
	30	#include <asm/pgtable.h>
	31	#include <asm/vaddrs.h>
	32	#include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
	33	#include <asm/tlb.h>
	34
	35	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	36
	37	unsigned long *sparc_valid_addr_bitmap;
	38
	39	unsigned long phys_base;
	40	unsigned long pfn_base;
	41
	42	unsigned long page_kernel;
	43
	44	struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
	45	unsigned long sparc_unmapped_base;
	46
	47	struct pgtable_cache_struct pgt_quicklists;
	48
	49	/* References to section boundaries */
	50	extern char __init_begin, __init_end, _start, _end, etext , edata;
	51
	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
	71	void show_mem(void)
	72	{
	73	printk("Mem-info:\n");
	74	show_free_areas();
	75	printk("Free swap: %6ldkB\n",
	76	nr_swap_pages << (PAGE_SHIFT-10));
	77	printk("%ld pages of RAM\n", totalram_pages);
	78	printk("%d free pages\n", nr_free_pages());
	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
131	unsigned long calc_max_low_pfn(void)
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) {
209	if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
210	sparc_ramdisk_image -= KERNBASE;
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;
262	reserve_bootmem(initrd_start, size);
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;
271	reserve_bootmem(phys_base, size);
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;
279	reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
280	*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
281
282	return max_pfn;
283	}
284
285	/*
286	* check_pgt_cache
287	*
288	* This is called at the end of unmapping of VMA (zap_page_range),
289	* to rescan the page cache for architecture specific things,
290	* presumably something like sun4/sun4c PMEGs. Most architectures
291	* define check_pgt_cache empty.
292	*
293	* We simply copy the 2.4 implementation for now.
294	*/
295	int pgt_cache_water[2] = { 25, 50 };
296
297	void check_pgt_cache(void)
298	{
299	do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
300	}
301
302	/*
303	* paging_init() sets up the page tables: We call the MMU specific
304	* init routine based upon the Sun model type on the Sparc.
305	*
306	*/
307	extern void sun4c_paging_init(void);
308	extern void srmmu_paging_init(void);
309	extern void device_scan(void);
310
311	void __init paging_init(void)
312	{
313	switch(sparc_cpu_model) {
314	case sun4c:
315	case sun4e:
316	case sun4:
317	sun4c_paging_init();
318	sparc_unmapped_base = 0xe0000000;
319	BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
320	break;
321	case sun4m:
322	case sun4d:
323	srmmu_paging_init();
324	sparc_unmapped_base = 0x50000000;
325	BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
326	break;
327	default:
328	prom_printf("paging_init: Cannot init paging on this Sparc\n");
329	prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
330	prom_printf("paging_init: Halting...\n");
331	prom_halt();
332	};
333
334	/* Initialize the protection map with non-constant, MMU dependent values. */
335	protection_map[0] = PAGE_NONE;
336	protection_map[1] = PAGE_READONLY;
337	protection_map[2] = PAGE_COPY;
338	protection_map[3] = PAGE_COPY;
339	protection_map[4] = PAGE_READONLY;
340	protection_map[5] = PAGE_READONLY;
341	protection_map[6] = PAGE_COPY;
342	protection_map[7] = PAGE_COPY;
343	protection_map[8] = PAGE_NONE;
344	protection_map[9] = PAGE_READONLY;
345	protection_map[10] = PAGE_SHARED;
346	protection_map[11] = PAGE_SHARED;
347	protection_map[12] = PAGE_READONLY;
348	protection_map[13] = PAGE_READONLY;
349	protection_map[14] = PAGE_SHARED;
350	protection_map[15] = PAGE_SHARED;
351	btfixup();
352	device_scan();
353	}
354
355	struct cache_palias *sparc_aliases;
356
357	static void __init taint_real_pages(void)
358	{
359	int i;
360
361	for (i = 0; sp_banks[i].num_bytes; i++) {
362	unsigned long start, end;
363
364	start = sp_banks[i].base_addr;
365	end = start + sp_banks[i].num_bytes;
366
367	while (start < end) {
368	set_bit(start >> 20, sparc_valid_addr_bitmap);
369	start += PAGE_SIZE;
370	}
371	}
372	}
373
374	void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
375	{
376	unsigned long tmp;
377
378	#ifdef CONFIG_DEBUG_HIGHMEM
379	printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
380	#endif
381
382	for (tmp = start_pfn; tmp < end_pfn; tmp++) {
383	struct page *page = pfn_to_page(tmp);
384
385	ClearPageReserved(page);
1da177e4 LT	386	set_page_count(page, 1);
	387	__free_page(page);
	388	totalhigh_pages++;
	389	}
	390	}
	391
	392	void __init mem_init(void)
	393	{
	394	int codepages = 0;
	395	int datapages = 0;
	396	int initpages = 0;
	397	int reservedpages = 0;
	398	int i;
	399
	400	if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
	401	prom_printf("BUG: fixmap and pkmap areas overlap\n");
	402	prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
	403	PKMAP_BASE,
	404	(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	405	FIXADDR_START);
	406	prom_printf("Please mail sparclinux@vger.kernel.org.\n");
	407	prom_halt();
	408	}
	409
	410
	411	/* Saves us work later. */
	412	memset((void *)&empty_zero_page, 0, PAGE_SIZE);
	413
	414	i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
	415	i += 1;
	416	sparc_valid_addr_bitmap = (unsigned long *)
	417	__alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
	418
	419	if (sparc_valid_addr_bitmap == NULL) {
	420	prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
	421	prom_halt();
	422	}
	423	memset(sparc_valid_addr_bitmap, 0, i << 2);
	424
	425	taint_real_pages();
	426
	427	max_mapnr = last_valid_pfn - pfn_base;
	428	high_memory = __va(max_low_pfn << PAGE_SHIFT);
	429
	430	totalram_pages = free_all_bootmem();
	431
	432	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
	433	unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
	434	unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
	435
	436	num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
	437
	438	if (end_pfn <= highstart_pfn)
	439	continue;
	440
	441	if (start_pfn < highstart_pfn)
	442	start_pfn = highstart_pfn;
	443
	444	map_high_region(start_pfn, end_pfn);
	445	}
	446
	447	totalram_pages += totalhigh_pages;
	448
	449	codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
450	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
451	datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
452	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
453	initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
454	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
455
456	/* Ignore memory holes for the purpose of counting reserved pages */
457	for (i=0; i < max_low_pfn; i++)
458	if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
459	&& PageReserved(pfn_to_page(i)))
460	reservedpages++;
461
462	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
463	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
464	num_physpages << (PAGE_SHIFT - 10),
465	codepages << (PAGE_SHIFT-10),
466	reservedpages << (PAGE_SHIFT - 10),
467	datapages << (PAGE_SHIFT-10),
468	initpages << (PAGE_SHIFT-10),
469	totalhigh_pages << (PAGE_SHIFT-10));
470	}
471
472	void free_initmem (void)
473	{
474	unsigned long addr;
475
476	addr = (unsigned long)(&__init_begin);
477	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
478	struct page *p;
479
480	p = virt_to_page(addr);
481
482	ClearPageReserved(p);
483	set_page_count(p, 1);
484	__free_page(p);
485	totalram_pages++;
486	num_physpages++;
487	}
488	printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
489	}
490
491	#ifdef CONFIG_BLK_DEV_INITRD
492	void free_initrd_mem(unsigned long start, unsigned long end)
493	{
494	if (start < end)
495	printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
496	for (; start < end; start += PAGE_SIZE) {
497	struct page *p = virt_to_page(start);
498
499	ClearPageReserved(p);
500	set_page_count(p, 1);
501	__free_page(p);
502	num_physpages++;
503	}
504	}
505	#endif
506
507	void sparc_flush_page_to_ram(struct page *page)
508	{
509	unsigned long vaddr = (unsigned long)page_address(page);
510
511	if (vaddr)
512	__flush_page_to_ram(vaddr);
513	}