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 45extern unsigned long memory_start, memory_end; 46 47/* Pure 2^n version of get_order */ 48static inline int get_order(unsigned long size) 49{ 50 unsigned lz; 51 52 size = (size - 1) >> PAGE_SHIFT; 53 asm("clz %0, %1" : "=r"(lz) : "r"(size)); 54 return 32 - lz; 55} 56 57#endif /* !__ASSEMBLY__ */ 58 59/* 60 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff 61 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when 62 * segmentation is enabled. We want to make use of this in order to 63 * minimize TLB pressure. 64 */ 65#define PAGE_OFFSET (0x80000000UL) 66 67/* 68 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure 69 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here 70 * in that case, so we'll have to mask out the three most significant 71 * bits of the address instead... 72 * 73 * What's the difference between __pa() and virt_to_phys() anyway? 74 */ 75#define __pa(x) PHYSADDR(x) 76#define __va(x) ((void *)(P1SEGADDR(x))) 77 78#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT) 79 80#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT)) 81#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 82 83#ifndef CONFIG_NEED_MULTIPLE_NODES 84 85#define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT) 86 87#define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET)) 88#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET) 89#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 90#endif /* CONFIG_NEED_MULTIPLE_NODES */ 91 92#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 93#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 94 95#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 96 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 97 98/* 99 * Memory above this physical address will be considered highmem. 100 */ 101#define HIGHMEM_START 0x20000000UL 102 103#endif /* __ASM_AVR32_PAGE_H */ 104