[linux-2.6-block.git] / include / asm-avr32 / page.h

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_PAGE_H
#define __ASM_AVR32_PAGE_H

#include <linux/const.h>

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE-1))
#define PTE_MASK	PAGE_MASK

#ifndef __ASSEMBLY__

#include <asm/addrspace.h>

extern void clear_page(void *to);
extern void copy_page(void *to, void *from);

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

/*
 * These are used to make use of C type-checking..
 */
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct page *pgtable_t;

#define pte_val(x)		((x).pte)
#define pgd_val(x)		((x).pgd)
#define pgprot_val(x)		((x).pgprot)

#define __pte(x)		((pte_t) { (x) })
#define __pgd(x)		((pgd_t) { (x) })
#define __pgprot(x)		((pgprot_t) { (x) })

/* FIXME: These should be removed soon */
extern unsigned long memory_start, memory_end;

/* Pure 2^n version of get_order */
static inline int get_order(unsigned long size)
{
	unsigned lz;

	size = (size - 1) >> PAGE_SHIFT;
	asm("clz %0, %1" : "=r"(lz) : "r"(size));
	return 32 - lz;
}

#endif /* !__ASSEMBLY__ */

/* Align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)

/*
 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
 * segmentation is enabled. We want to make use of this in order to
 * minimize TLB pressure.
 */
#define PAGE_OFFSET		(0x80000000UL)

/*
 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
 * in that case, so we'll have to mask out the three most significant
 * bits of the address instead...
 *
 * What's the difference between __pa() and virt_to_phys() anyway?
 */
#define __pa(x)		PHYSADDR(x)
#define __va(x)		((void *)(P1SEGADDR(x)))

#define MAP_NR(addr)	(((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)

#define phys_to_page(phys)	(pfn_to_page(phys >> PAGE_SHIFT))
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

#ifndef CONFIG_NEED_MULTIPLE_NODES

#define PHYS_PFN_OFFSET		(CONFIG_PHYS_OFFSET >> PAGE_SHIFT)

#define pfn_to_page(pfn)	(mem_map + ((pfn) - PHYS_PFN_OFFSET))
#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
#endif /* CONFIG_NEED_MULTIPLE_NODES */

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE |	\
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

/*
 * Memory above this physical address will be considered highmem.
 */
#define HIGHMEM_START		0x20000000UL

#endif /* __ASM_AVR32_PAGE_H */
Commit	Line	Data
5f97f7f9 HS	1	/*
	2	* Copyright (C) 2004-2006 Atmel Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8	#ifndef __ASM_AVR32_PAGE_H
	9	#define __ASM_AVR32_PAGE_H
	10
e573ebb0 CG	11	#include <linux/const.h>
e573ebb0 CG	12
5f97f7f9 HS	13	/* PAGE_SHIFT determines the page size */
5f97f7f9 HS	14	#define PAGE_SHIFT 12
e573ebb0	15	#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
5f97f7f9 HS	16	#define PAGE_MASK (~(PAGE_SIZE-1))
	17	#define PTE_MASK PAGE_MASK
	18
	19	#ifndef __ASSEMBLY__
	20
	21	#include <asm/addrspace.h>
	22
	23	extern void clear_page(void *to);
	24	extern void copy_page(void to, void from);
	25
	26	#define clear_user_page(page, vaddr, pg) clear_page(page)
	27	#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
	28
	29	/*
	30	* These are used to make use of C type-checking..
	31	*/
	32	typedef struct { unsigned long pte; } pte_t;
	33	typedef struct { unsigned long pgd; } pgd_t;
	34	typedef struct { unsigned long pgprot; } pgprot_t;
2f569afd	35	typedef struct page *pgtable_t;
5f97f7f9 HS	36
	37	#define pte_val(x) ((x).pte)
	38	#define pgd_val(x) ((x).pgd)
	39	#define pgprot_val(x) ((x).pgprot)
	40
	41	#define __pte(x) ((pte_t) { (x) })
	42	#define __pgd(x) ((pgd_t) { (x) })
	43	#define __pgprot(x) ((pgprot_t) { (x) })
	44
	45	/* FIXME: These should be removed soon */
	46	extern unsigned long memory_start, memory_end;
	47
	48	/* Pure 2^n version of get_order */
	49	static inline int get_order(unsigned long size)
	50	{
	51	unsigned lz;
	52
	53	size = (size - 1) >> PAGE_SHIFT;
	54	asm("clz %0, %1" : "=r"(lz) : "r"(size));
	55	return 32 - lz;
	56	}
	57
	58	#endif /* !__ASSEMBLY__ */
	59
	60	/* Align the pointer to the (next) page boundary */
	61	#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
	62
	63	/*
	64	* The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
	65	* permanently to the physical addresses 0x00000000 -> 0x1fffffff when
	66	* segmentation is enabled. We want to make use of this in order to
	67	* minimize TLB pressure.
	68	*/
	69	#define PAGE_OFFSET (0x80000000UL)
	70
	71	/*
	72	* ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
	73	* is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
	74	* in that case, so we'll have to mask out the three most significant
	75	* bits of the address instead...
	76	*
	77	* What's the difference between __pa() and virt_to_phys() anyway?
	78	*/
	79	#define __pa(x) PHYSADDR(x)
	80	#define __va(x) ((void *)(P1SEGADDR(x)))
	81
	82	#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
	83
	84	#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
	85	#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
	86
	87	#ifndef CONFIG_NEED_MULTIPLE_NODES
	88
	89	#define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
	90
	91	#define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET))
	92	#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
	93	#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
	94	#endif /* CONFIG_NEED_MULTIPLE_NODES */
	95
	96	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	97	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	98
	99	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| \
100	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
101
102	/*
103	* Memory above this physical address will be considered highmem.
104	*/
105	#define HIGHMEM_START 0x20000000UL
106
5f97f7f9	107	#endif /* __ASM_AVR32_PAGE_H */