[mirror_ubuntu-zesty-kernel.git] / arch / mips / mm / init.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2000 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>
#include <linux/hardirq.h>
#include <linux/gfp.h>
#include <linux/kcore.h>

#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/kmap_types.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/fixmap.h>

/*
 * We have up to 8 empty zeroed pages so we can map one of the right colour
 * when needed.	 This is necessary only on R4000 / R4400 SC and MC versions
 * where we have to avoid VCED / VECI exceptions for good performance at
 * any price.  Since page is never written to after the initialization we
 * don't have to care about aliases on other CPUs.
 */
unsigned long empty_zero_page, zero_page_mask;
EXPORT_SYMBOL_GPL(empty_zero_page);
EXPORT_SYMBOL(zero_page_mask);

/*
 * Not static inline because used by IP27 special magic initialization code
 */
void setup_zero_pages(void)
{
	unsigned int order, i;
	struct page *page;

	if (cpu_has_vce)
		order = 3;
	else
		order = 0;

	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
	if (!empty_zero_page)
		panic("Oh boy, that early out of memory?");

	page = virt_to_page((void *)empty_zero_page);
	split_page(page, order);
	for (i = 0; i < (1 << order); i++, page++)
		mark_page_reserved(page);

	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
}

static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
{
	enum fixed_addresses idx;
	unsigned long vaddr, flags, entrylo;
	unsigned long old_ctx;
	pte_t pte;
	int tlbidx;

	BUG_ON(Page_dcache_dirty(page));

	pagefault_disable();
	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
	idx += in_interrupt() ? FIX_N_COLOURS : 0;
	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
	pte = mk_pte(page, prot);
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
	entrylo = pte_to_entrylo(pte.pte_high);
#else
	entrylo = pte_to_entrylo(pte_val(pte));
#endif

	local_irq_save(flags);
	old_ctx = read_c0_entryhi();
	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	write_c0_entrylo0(entrylo);
	write_c0_entrylo1(entrylo);
#ifdef CONFIG_XPA
	entrylo = (pte.pte_low & _PFNX_MASK);
	writex_c0_entrylo0(entrylo);
	writex_c0_entrylo1(entrylo);
#endif
	tlbidx = read_c0_wired();
	write_c0_wired(tlbidx + 1);
	write_c0_index(tlbidx);
	mtc0_tlbw_hazard();
	tlb_write_indexed();
	tlbw_use_hazard();
	write_c0_entryhi(old_ctx);
	local_irq_restore(flags);

	return (void*) vaddr;
}

void *kmap_coherent(struct page *page, unsigned long addr)
{
	return __kmap_pgprot(page, addr, PAGE_KERNEL);
}

void *kmap_noncoherent(struct page *page, unsigned long addr)
{
	return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
}

void kunmap_coherent(void)
{
	unsigned int wired;
	unsigned long flags, old_ctx;

	local_irq_save(flags);
	old_ctx = read_c0_entryhi();
	wired = read_c0_wired() - 1;
	write_c0_wired(wired);
	write_c0_index(wired);
	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
	write_c0_entrylo0(0);
	write_c0_entrylo1(0);
	mtc0_tlbw_hazard();
	tlb_write_indexed();
	tlbw_use_hazard();
	write_c0_entryhi(old_ctx);
	local_irq_restore(flags);
	pagefault_enable();
}

void copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma)
{
	void *vfrom, *vto;

	vto = kmap_atomic(to);
	if (cpu_has_dc_aliases &&
	    page_mapped(from) && !Page_dcache_dirty(from)) {
		vfrom = kmap_coherent(from, vaddr);
		copy_page(vto, vfrom);
		kunmap_coherent();
	} else {
		vfrom = kmap_atomic(from);
		copy_page(vto, vfrom);
		kunmap_atomic(vfrom);
	}
	if ((!cpu_has_ic_fills_f_dc) ||
	    pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
		flush_data_cache_page((unsigned long)vto);
	kunmap_atomic(vto);
	/* Make sure this page is cleared on other CPU's too before using it */
	smp_wmb();
}

void copy_to_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len)
{
	if (cpu_has_dc_aliases &&
	    page_mapped(page) && !Page_dcache_dirty(page)) {
		void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(vto, src, len);
		kunmap_coherent();
	} else {
		memcpy(dst, src, len);
		if (cpu_has_dc_aliases)
			SetPageDcacheDirty(page);
	}
	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
		flush_cache_page(vma, vaddr, page_to_pfn(page));
}

void copy_from_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len)
{
	if (cpu_has_dc_aliases &&
	    page_mapped(page) && !Page_dcache_dirty(page)) {
		void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(dst, vfrom, len);
		kunmap_coherent();
	} else {
		memcpy(dst, src, len);
		if (cpu_has_dc_aliases)
			SetPageDcacheDirty(page);
	}
}
EXPORT_SYMBOL_GPL(copy_from_user_page);

void __init fixrange_init(unsigned long start, unsigned long end,
	pgd_t *pgd_base)
{
#ifdef CONFIG_HIGHMEM
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	int i, j, k;
	unsigned long vaddr;

	vaddr = start;
	i = __pgd_offset(vaddr);
	j = __pud_offset(vaddr);
	k = __pmd_offset(vaddr);
	pgd = pgd_base + i;

	for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
		pud = (pud_t *)pgd;
		for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
			pmd = (pmd_t *)pud;
			for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
				if (pmd_none(*pmd)) {
					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
					set_pmd(pmd, __pmd((unsigned long)pte));
					BUG_ON(pte != pte_offset_kernel(pmd, 0));
				}
				vaddr += PMD_SIZE;
			}
			k = 0;
		}
		j = 0;
	}
#endif
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
int page_is_ram(unsigned long pagenr)
{
	int i;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long addr, end;

		switch (boot_mem_map.map[i].type) {
		case BOOT_MEM_RAM:
		case BOOT_MEM_INIT_RAM:
			break;
		default:
			/* not usable memory */
			continue;
		}

		addr = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr +
			       boot_mem_map.map[i].size);

		if (pagenr >= addr && pagenr < end)
			return 1;
	}

	return 0;
}

void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long lastpfn __maybe_unused;

	pagetable_init();

#ifdef CONFIG_HIGHMEM
	kmap_init();
#endif
#ifdef CONFIG_ZONE_DMA
	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	lastpfn = max_low_pfn;
#ifdef CONFIG_HIGHMEM
	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
	lastpfn = highend_pfn;

	if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
		printk(KERN_WARNING "This processor doesn't support highmem."
		       " %ldk highmem ignored\n",
		       (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
		max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
		lastpfn = max_low_pfn;
	}
#endif

	free_area_init_nodes(max_zone_pfns);
}

#ifdef CONFIG_64BIT
static struct kcore_list kcore_kseg0;
#endif

static inline void mem_init_free_highmem(void)
{
#ifdef CONFIG_HIGHMEM
	unsigned long tmp;

	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
		struct page *page = pfn_to_page(tmp);

		if (!page_is_ram(tmp))
			SetPageReserved(page);
		else
			free_highmem_page(page);
	}
#endif
}

unsigned __weak platform_maar_init(unsigned num_maars)
{
	return 0;
}

static void maar_init(void)
{
	unsigned num_maars, used, i;

	if (!cpu_has_maar)
		return;

	/* Detect the number of MAARs */
	write_c0_maari(~0);
	back_to_back_c0_hazard();
	num_maars = read_c0_maari() + 1;

	/* MAARs should be in pairs */
	WARN_ON(num_maars % 2);

	/* Configure the required MAARs */
	used = platform_maar_init(num_maars / 2);

	/* Disable any further MAARs */
	for (i = (used * 2); i < num_maars; i++) {
		write_c0_maari(i);
		back_to_back_c0_hazard();
		write_c0_maar(0);
		back_to_back_c0_hazard();
	}
}

void __init mem_init(void)
{
#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_DISCONTIGMEM
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
#endif
	max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
#else
	max_mapnr = max_low_pfn;
#endif
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

	maar_init();
	free_all_bootmem();
	setup_zero_pages();	/* Setup zeroed pages.  */
	mem_init_free_highmem();
	mem_init_print_info(NULL);

#ifdef CONFIG_64BIT
	if ((unsigned long) &_text > (unsigned long) CKSEG0)
		/* The -4 is a hack so that user tools don't have to handle
		   the overflow.  */
		kclist_add(&kcore_kseg0, (void *) CKSEG0,
				0x80000000 - 4, KCORE_TEXT);
#endif
}
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void free_init_pages(const char *what, unsigned long begin, unsigned long end)
{
	unsigned long pfn;

	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
		struct page *page = pfn_to_page(pfn);
		void *addr = phys_to_virt(PFN_PHYS(pfn));

		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
		free_reserved_page(page);
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}

#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 (*free_init_pages_eva)(void *begin, void *end) = NULL;

void __init_refok free_initmem(void)
{
	prom_free_prom_memory();
	/*
	 * Let the platform define a specific function to free the
	 * init section since EVA may have used any possible mapping
	 * between virtual and physical addresses.
	 */
	if (free_init_pages_eva)
		free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
	else
		free_initmem_default(POISON_FREE_INITMEM);
}

#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
unsigned long pgd_current[NR_CPUS];
#endif

/*
 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 * are constants.  So we use the variants from asm-offset.h until that gcc
 * will officially be retired.
 *
 * Align swapper_pg_dir in to 64K, allows its address to be loaded
 * with a single LUI instruction in the TLB handlers.  If we used
 * __aligned(64K), its size would get rounded up to the alignment
 * size, and waste space.  So we place it in its own section and align
 * it in the linker script.
 */
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1994 - 2000 Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
	9	* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
	10	*/
b868868a	11	#include <linux/bug.h>
1da177e4 LT	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/signal.h>
	15	#include <linux/sched.h>
631330f5	16	#include <linux/smp.h>
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/errno.h>
	19	#include <linux/string.h>
	20	#include <linux/types.h>
	21	#include <linux/pagemap.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/mman.h>
	24	#include <linux/mm.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/highmem.h>
	27	#include <linux/swap.h>
3d503753	28	#include <linux/proc_fs.h>
22a9835c	29	#include <linux/pfn.h>
0f334a3e	30	#include <linux/hardirq.h>
5a0e3ad6	31	#include <linux/gfp.h>
2f96b8c1	32	#include <linux/kcore.h>
1da177e4	33
9975e77d	34	#include <asm/asm-offsets.h>
1da177e4 LT	35	#include <asm/bootinfo.h>
	36	#include <asm/cachectl.h>
	37	#include <asm/cpu.h>
	38	#include <asm/dma.h>
f8829cae	39	#include <asm/kmap_types.h>
1da177e4 LT	40	#include <asm/mmu_context.h>
	41	#include <asm/sections.h>
	42	#include <asm/pgtable.h>
	43	#include <asm/pgalloc.h>
	44	#include <asm/tlb.h>
f8829cae RB	45	#include <asm/fixmap.h>
f8829cae RB	46
1da177e4 LT	47	/*
1da177e4 LT	48	* We have up to 8 empty zeroed pages so we can map one of the right colour
70342287	49	* when needed. This is necessary only on R4000 / R4400 SC and MC versions
1da177e4 LT	50	* where we have to avoid VCED / VECI exceptions for good performance at
	51	* any price. Since page is never written to after the initialization we
	52	* don't have to care about aliases on other CPUs.
	53	*/
	54	unsigned long empty_zero_page, zero_page_mask;
497d2adc	55	EXPORT_SYMBOL_GPL(empty_zero_page);
0b70068e	56	EXPORT_SYMBOL(zero_page_mask);
1da177e4 LT	57
	58	/*
	59	* Not static inline because used by IP27 special magic initialization code
	60	*/
31605922	61	void setup_zero_pages(void)
1da177e4	62	{
31605922	63	unsigned int order, i;
1da177e4 LT	64	struct page *page;
	65
	66	if (cpu_has_vce)
	67	order = 3;
	68	else
	69	order = 0;
	70
	71	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	72	if (!empty_zero_page)
	73	panic("Oh boy, that early out of memory?");
	74
99e3b942	75	page = virt_to_page((void *)empty_zero_page);
8dfcc9ba	76	split_page(page, order);
31605922 JL	77	for (i = 0; i < (1 << order); i++, page++)
31605922 JL	78	mark_page_reserved(page);
1da177e4	79
31605922	80	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
1da177e4 LT	81	}
1da177e4 LT	82
e2a9e5ad	83	static void __kmap_pgprot(struct page page, unsigned long addr, pgprot_t prot)
f8829cae RB	84	{
	85	enum fixed_addresses idx;
	86	unsigned long vaddr, flags, entrylo;
	87	unsigned long old_ctx;
	88	pte_t pte;
	89	int tlbidx;
	90
b868868a RB	91	BUG_ON(Page_dcache_dirty(page));
b868868a RB	92
bdb43806	93	pagefault_disable();
f8829cae	94	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
0f334a3e	95	idx += in_interrupt() ? FIX_N_COLOURS : 0;
f8829cae	96	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
e2a9e5ad	97	pte = mk_pte(page, prot);
34adb28d	98	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
c5b36783	99	entrylo = pte_to_entrylo(pte.pte_high);
f8829cae	100	#else
6dd9344c	101	entrylo = pte_to_entrylo(pte_val(pte));
f8829cae RB	102	#endif
f8829cae RB	103
b633648c	104	local_irq_save(flags);
f8829cae RB	105	old_ctx = read_c0_entryhi();
	106	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	107	write_c0_entrylo0(entrylo);
	108	write_c0_entrylo1(entrylo);
c5b36783 SH	109	#ifdef CONFIG_XPA
	110	entrylo = (pte.pte_low & _PFNX_MASK);
	111	writex_c0_entrylo0(entrylo);
	112	writex_c0_entrylo1(entrylo);
	113	#endif
f8829cae RB	114	tlbidx = read_c0_wired();
	115	write_c0_wired(tlbidx + 1);
	116	write_c0_index(tlbidx);
	117	mtc0_tlbw_hazard();
	118	tlb_write_indexed();
f8829cae RB	119	tlbw_use_hazard();
f8829cae RB	120	write_c0_entryhi(old_ctx);
b633648c	121	local_irq_restore(flags);
f8829cae RB	122
	123	return (void*) vaddr;
	124	}
	125
e2a9e5ad PB	126	void kmap_coherent(struct page page, unsigned long addr)
	127	{
	128	return __kmap_pgprot(page, addr, PAGE_KERNEL);
	129	}
	130
	131	void kmap_noncoherent(struct page page, unsigned long addr)
	132	{
	133	return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
	134	}
	135
eacb9d61	136	void kunmap_coherent(void)
f8829cae	137	{
f8829cae RB	138	unsigned int wired;
	139	unsigned long flags, old_ctx;
	140
b633648c	141	local_irq_save(flags);
f8829cae RB	142	old_ctx = read_c0_entryhi();
	143	wired = read_c0_wired() - 1;
	144	write_c0_wired(wired);
	145	write_c0_index(wired);
	146	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
	147	write_c0_entrylo0(0);
	148	write_c0_entrylo1(0);
	149	mtc0_tlbw_hazard();
	150	tlb_write_indexed();
	151	tlbw_use_hazard();
	152	write_c0_entryhi(old_ctx);
b633648c	153	local_irq_restore(flags);
bdb43806	154	pagefault_enable();
f8829cae RB	155	}
f8829cae RB	156
bcd02280 AN	157	void copy_user_highpage(struct page to, struct page from,
	158	unsigned long vaddr, struct vm_area_struct *vma)
	159	{
	160	void vfrom, vto;
	161
9c02048f	162	vto = kmap_atomic(to);
9a74b3eb RB	163	if (cpu_has_dc_aliases &&
9a74b3eb RB	164	page_mapped(from) && !Page_dcache_dirty(from)) {
bcd02280 AN	165	vfrom = kmap_coherent(from, vaddr);
bcd02280 AN	166	copy_page(vto, vfrom);
eacb9d61	167	kunmap_coherent();
bcd02280	168	} else {
9c02048f	169	vfrom = kmap_atomic(from);
bcd02280	170	copy_page(vto, vfrom);
9c02048f	171	kunmap_atomic(vfrom);
bcd02280	172	}
39b8d525	173	if ((!cpu_has_ic_fills_f_dc) \|\|
bcd02280 AN	174	pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
bcd02280 AN	175	flush_data_cache_page((unsigned long)vto);
9c02048f	176	kunmap_atomic(vto);
bcd02280 AN	177	/* Make sure this page is cleared on other CPU's too before using it */
	178	smp_wmb();
	179	}
	180
f8829cae RB	181	void copy_to_user_page(struct vm_area_struct *vma,
	182	struct page page, unsigned long vaddr, void dst, const void *src,
	183	unsigned long len)
	184	{
9a74b3eb RB	185	if (cpu_has_dc_aliases &&
9a74b3eb RB	186	page_mapped(page) && !Page_dcache_dirty(page)) {
f8829cae RB	187	void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
f8829cae RB	188	memcpy(vto, src, len);
eacb9d61	189	kunmap_coherent();
985c30ef	190	} else {
f8829cae	191	memcpy(dst, src, len);
985c30ef RB	192	if (cpu_has_dc_aliases)
	193	SetPageDcacheDirty(page);
	194	}
f8829cae RB	195	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
	196	flush_cache_page(vma, vaddr, page_to_pfn(page));
	197	}
	198
f8829cae RB	199	void copy_from_user_page(struct vm_area_struct *vma,
	200	struct page page, unsigned long vaddr, void dst, const void *src,
	201	unsigned long len)
	202	{
9a74b3eb RB	203	if (cpu_has_dc_aliases &&
9a74b3eb RB	204	page_mapped(page) && !Page_dcache_dirty(page)) {
985c30ef	205	void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
f8829cae	206	memcpy(dst, vfrom, len);
eacb9d61	207	kunmap_coherent();
985c30ef	208	} else {
f8829cae	209	memcpy(dst, src, len);
985c30ef RB	210	if (cpu_has_dc_aliases)
	211	SetPageDcacheDirty(page);
	212	}
f8829cae	213	}
bf9621aa	214	EXPORT_SYMBOL_GPL(copy_from_user_page);
f8829cae	215
84fd089a	216	void __init fixrange_init(unsigned long start, unsigned long end,
1da177e4 LT	217	pgd_t *pgd_base)
1da177e4 LT	218	{
b633648c	219	#ifdef CONFIG_HIGHMEM
1da177e4	220	pgd_t *pgd;
c6e8b587	221	pud_t *pud;
1da177e4 LT	222	pmd_t *pmd;
1da177e4 LT	223	pte_t *pte;
c6e8b587	224	int i, j, k;
1da177e4 LT	225	unsigned long vaddr;
	226
	227	vaddr = start;
	228	i = __pgd_offset(vaddr);
c6e8b587 RB	229	j = __pud_offset(vaddr);
c6e8b587 RB	230	k = __pmd_offset(vaddr);
1da177e4 LT	231	pgd = pgd_base + i;
1da177e4 LT	232
464fd83e	233	for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
c6e8b587	234	pud = (pud_t *)pgd;
464fd83e	235	for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
c6e8b587	236	pmd = (pmd_t *)pud;
464fd83e	237	for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
c6e8b587 RB	238	if (pmd_none(*pmd)) {
c6e8b587 RB	239	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
f8829cae	240	set_pmd(pmd, __pmd((unsigned long)pte));
b72b7092	241	BUG_ON(pte != pte_offset_kernel(pmd, 0));
c6e8b587 RB	242	}
c6e8b587 RB	243	vaddr += PMD_SIZE;
1da177e4	244	}
c6e8b587	245	k = 0;
1da177e4 LT	246	}
	247	j = 0;
	248	}
f8829cae	249	#endif
1da177e4	250	}
1da177e4	251
b4819b59	252	#ifndef CONFIG_NEED_MULTIPLE_NODES
61ef2489	253	int page_is_ram(unsigned long pagenr)
565200a1 AN	254	{
	255	int i;
	256
	257	for (i = 0; i < boot_mem_map.nr_map; i++) {
	258	unsigned long addr, end;
	259
43064c0c DD	260	switch (boot_mem_map.map[i].type) {
	261	case BOOT_MEM_RAM:
	262	case BOOT_MEM_INIT_RAM:
	263	break;
	264	default:
565200a1 AN	265	/* not usable memory */
565200a1 AN	266	continue;
43064c0c	267	}
565200a1 AN	268
	269	addr = PFN_UP(boot_mem_map.map[i].addr);
	270	end = PFN_DOWN(boot_mem_map.map[i].addr +
	271	boot_mem_map.map[i].size);
	272
	273	if (pagenr >= addr && pagenr < end)
	274	return 1;
	275	}
	276
	277	return 0;
	278	}
	279
1da177e4 LT	280	void __init paging_init(void)
1da177e4 LT	281	{
cce335ae	282	unsigned long max_zone_pfns[MAX_NR_ZONES];
d3ce0e98	283	unsigned long lastpfn __maybe_unused;
1da177e4 LT	284
	285	pagetable_init();
	286
	287	#ifdef CONFIG_HIGHMEM
	288	kmap_init();
	289	#endif
05502339	290	#ifdef CONFIG_ZONE_DMA
cce335ae	291	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
1da177e4	292	#endif
cce335ae RB	293	#ifdef CONFIG_ZONE_DMA32
	294	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
	295	#endif
	296	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	297	lastpfn = max_low_pfn;
1da177e4	298	#ifdef CONFIG_HIGHMEM
cce335ae RB	299	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
cce335ae RB	300	lastpfn = highend_pfn;
cbb8fc07	301
cce335ae	302	if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
cbb8fc07	303	printk(KERN_WARNING "This processor doesn't support highmem."
cce335ae RB	304	" %ldk highmem ignored\n",
	305	(highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
	306	max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
	307	lastpfn = max_low_pfn;
cbb8fc07	308	}
1da177e4 LT	309	#endif
1da177e4 LT	310
cce335ae	311	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	312	}
1da177e4 LT	313
3d503753 DJ	314	#ifdef CONFIG_64BIT
	315	static struct kcore_list kcore_kseg0;
	316	#endif
	317
1132137e	318	static inline void mem_init_free_highmem(void)
1da177e4	319	{
1132137e JL	320	#ifdef CONFIG_HIGHMEM
1132137e JL	321	unsigned long tmp;
1da177e4	322
1132137e JL	323	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
	324	struct page *page = pfn_to_page(tmp);
	325
	326	if (!page_is_ram(tmp))
	327	SetPageReserved(page);
	328	else
	329	free_highmem_page(page);
	330	}
	331	#endif
	332	}
	333
ab9988a3 PB	334	unsigned __weak platform_maar_init(unsigned num_maars)
	335	{
	336	return 0;
	337	}
	338
	339	static void maar_init(void)
	340	{
	341	unsigned num_maars, used, i;
	342
	343	if (!cpu_has_maar)
	344	return;
	345
	346	/* Detect the number of MAARs */
	347	write_c0_maari(~0);
	348	back_to_back_c0_hazard();
	349	num_maars = read_c0_maari() + 1;
	350
	351	/* MAARs should be in pairs */
	352	WARN_ON(num_maars % 2);
	353
	354	/* Configure the required MAARs */
	355	used = platform_maar_init(num_maars / 2);
	356
	357	/* Disable any further MAARs */
	358	for (i = (used * 2); i < num_maars; i++) {
	359	write_c0_maari(i);
	360	back_to_back_c0_hazard();
	361	write_c0_maar(0);
	362	back_to_back_c0_hazard();
	363	}
	364	}
	365
1132137e JL	366	void __init mem_init(void)
1132137e JL	367	{
1da177e4 LT	368	#ifdef CONFIG_HIGHMEM
	369	#ifdef CONFIG_DISCONTIGMEM
	370	#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
	371	#endif
b6da0ffb	372	max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
1da177e4	373	#else
565200a1	374	max_mapnr = max_low_pfn;
1da177e4 LT	375	#endif
	376	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	377
ab9988a3	378	maar_init();
0c988534	379	free_all_bootmem();
31605922	380	setup_zero_pages(); /* Setup zeroed pages. */
1132137e JL	381	mem_init_free_highmem();
1132137e JL	382	mem_init_print_info(NULL);
1da177e4	383
3d503753 DJ	384	#ifdef CONFIG_64BIT
	385	if ((unsigned long) &_text > (unsigned long) CKSEG0)
	386	/* The -4 is a hack so that user tools don't have to handle
	387	the overflow. */
c30bb2a2 KH	388	kclist_add(&kcore_kseg0, (void *) CKSEG0,
c30bb2a2 KH	389	0x80000000 - 4, KCORE_TEXT);
3d503753	390	#endif
1da177e4	391	}
b4819b59	392	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4	393
c44e8d5e	394	void free_init_pages(const char *what, unsigned long begin, unsigned long end)
6fd11a21	395	{
acd86b86	396	unsigned long pfn;
6fd11a21	397
acd86b86 FBH	398	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
	399	struct page *page = pfn_to_page(pfn);
	400	void *addr = phys_to_virt(PFN_PHYS(pfn));
	401
acd86b86	402	memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
31605922	403	free_reserved_page(page);
6fd11a21 RB	404	}
	405	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	406	}
	407
1da177e4 LT	408	#ifdef CONFIG_BLK_DEV_INITRD
	409	void free_initrd_mem(unsigned long start, unsigned long end)
	410	{
11199692 JL	411	free_reserved_area((void )start, (void )end, POISON_FREE_INITMEM,
11199692 JL	412	"initrd");
1da177e4 LT	413	}
	414	#endif
	415
0893d3fb MC	416	void (free_init_pages_eva)(void begin, void *end) = NULL;
0893d3fb MC	417
fb4bb133	418	void __init_refok free_initmem(void)
1da177e4	419	{
c44e8d5e	420	prom_free_prom_memory();
0893d3fb MC	421	/*
	422	* Let the platform define a specific function to free the
	423	* init section since EVA may have used any possible mapping
	424	* between virtual and physical addresses.
	425	*/
	426	if (free_init_pages_eva)
	427	free_init_pages_eva((void )&__init_begin, (void )&__init_end);
	428	else
	429	free_initmem_default(POISON_FREE_INITMEM);
1da177e4	430	}
69a6c312	431
82622284	432	#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
69a6c312	433	unsigned long pgd_current[NR_CPUS];
82622284	434	#endif
9975e77d RB	435
	436	/*
	437	* gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
	438	* are constants. So we use the variants from asm-offset.h until that gcc
	439	* will officially be retired.
485172b3 DD	440	*
	441	* Align swapper_pg_dir in to 64K, allows its address to be loaded
	442	* with a single LUI instruction in the TLB handlers. If we used
	443	* __aligned(64K), its size would get rounded up to the alignment
	444	* size, and waste space. So we place it in its own section and align
	445	* it in the linker script.
9975e77d	446	*/
485172b3	447	pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
325f8a0a	448	#ifndef __PAGETABLE_PMD_FOLDED
485172b3	449	pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
69a6c312	450	#endif
485172b3	451	pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;