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
 11#include <linux/const.h>
 12
 13/* PAGE_SHIFT determines the page size */
 14#define PAGE_SHIFT	12
 15#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
 16#define PAGE_MASK	(~(PAGE_SIZE-1))
 17#define PTE_MASK	PAGE_MASK
 18
 19#ifndef __ASSEMBLY__
 20
 21#include <asm/addrspace.h>
 22
 23extern void clear_page(void *to);
 24extern 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 */
 32typedef struct { unsigned long pte; } pte_t;
 33typedef struct { unsigned long pgd; } pgd_t;
 34typedef struct { unsigned long pgprot; } pgprot_t;
 35typedef struct page *pgtable_t;
 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 */
 46extern unsigned long memory_start, memory_end;
 47
 48/* Pure 2^n version of get_order */
 49static 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/*
 61 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff
 62 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when
 63 * segmentation is enabled. We want to make use of this in order to
 64 * minimize TLB pressure.
 65 */
 66#define PAGE_OFFSET		(0x80000000UL)
 67
 68/*
 69 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure
 70 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here
 71 * in that case, so we'll have to mask out the three most significant
 72 * bits of the address instead...
 73 *
 74 * What's the difference between __pa() and virt_to_phys() anyway?
 75 */
 76#define __pa(x)		PHYSADDR(x)
 77#define __va(x)		((void *)(P1SEGADDR(x)))
 78
 79#define MAP_NR(addr)	(((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
 80
 81#define phys_to_page(phys)	(pfn_to_page(phys >> PAGE_SHIFT))
 82#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
 83
 84#ifndef CONFIG_NEED_MULTIPLE_NODES
 85
 86#define PHYS_PFN_OFFSET		(CONFIG_PHYS_OFFSET >> PAGE_SHIFT)
 87
 88#define pfn_to_page(pfn)	(mem_map + ((pfn) - PHYS_PFN_OFFSET))
 89#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET)
 90#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
 91#endif /* CONFIG_NEED_MULTIPLE_NODES */
 92
 93#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 94#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 95
 96#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE |	\
 97				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 98
 99/*
100 * Memory above this physical address will be considered highmem.
101 */
102#define HIGHMEM_START		0x20000000UL
103
104#endif /* __ASM_AVR32_PAGE_H */