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#ifdef __KERNEL__ 12 13/* PAGE_SHIFT determines the page size */ 14#define PAGE_SHIFT 12 15#ifdef __ASSEMBLY__ 16#define PAGE_SIZE (1 << PAGE_SHIFT) 17#else 18#define PAGE_SIZE (1UL << PAGE_SHIFT) 19#endif 20#define PAGE_MASK (~(PAGE_SIZE-1)) 21#define PTE_MASK PAGE_MASK 22 23#ifndef __ASSEMBLY__ 24 25#include <asm/addrspace.h> 26 27extern void clear_page(void *to); 28extern void copy_page(void *to, void *from); 29 30#define clear_user_page(page, vaddr, pg) clear_page(page) 31#define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 32 33/* 34 * These are used to make use of C type-checking.. 35 */ 36typedef struct { unsigned long pte; } pte_t; 37typedef struct { unsigned long pgd; } pgd_t; 38typedef struct { unsigned long pgprot; } pgprot_t; 39 40#define pte_val(x) ((x).pte) 41#define pgd_val(x) ((x).pgd) 42#define pgprot_val(x) ((x).pgprot) 43 44#define __pte(x) ((pte_t) { (x) }) 45#define __pgd(x) ((pgd_t) { (x) }) 46#define __pgprot(x) ((pgprot_t) { (x) }) 47 48extern unsigned long memory_start, memory_end; 49 50/* Pure 2^n version of get_order */ 51static inline int get_order(unsigned long size) 52{ 53 unsigned lz; 54 55 size = (size - 1) >> PAGE_SHIFT; 56 asm("clz %0, %1" : "=r"(lz) : "r"(size)); 57 return 32 - lz; 58} 59 60#endif /* !__ASSEMBLY__ */ 61 62/* Align the pointer to the (next) page boundary */ 63#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) 64 65/* 66 * The hardware maps the virtual addresses 0x80000000 -> 0x9fffffff 67 * permanently to the physical addresses 0x00000000 -> 0x1fffffff when 68 * segmentation is enabled. We want to make use of this in order to 69 * minimize TLB pressure. 70 */ 71#define PAGE_OFFSET (0x80000000UL) 72 73/* 74 * ALSA uses virt_to_page() on DMA pages, which I'm not entirely sure 75 * is a good idea. Anyway, we can't simply subtract PAGE_OFFSET here 76 * in that case, so we'll have to mask out the three most significant 77 * bits of the address instead... 78 * 79 * What's the difference between __pa() and virt_to_phys() anyway? 80 */ 81#define __pa(x) PHYSADDR(x) 82#define __va(x) ((void *)(P1SEGADDR(x))) 83 84#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT) 85 86#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT)) 87#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 88 89#ifndef CONFIG_NEED_MULTIPLE_NODES 90 91#define PHYS_PFN_OFFSET (CONFIG_PHYS_OFFSET >> PAGE_SHIFT) 92 93#define pfn_to_page(pfn) (mem_map + ((pfn) - PHYS_PFN_OFFSET)) 94#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PHYS_PFN_OFFSET) 95#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 96#endif /* CONFIG_NEED_MULTIPLE_NODES */ 97 98#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 99#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 100 101#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 102 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 103 104/* 105 * Memory above this physical address will be considered highmem. 106 */ 107#define HIGHMEM_START 0x20000000UL 108 109#endif /* __KERNEL__ */ 110 111#endif /* __ASM_AVR32_PAGE_H */ 112