1#ifndef __ASM_SH_PAGE_H 2#define __ASM_SH_PAGE_H 3 4/* 5 * Copyright (C) 1999 Niibe Yutaka 6 */ 7 8#include <linux/const.h> 9 10/* PAGE_SHIFT determines the page size */ 11#if defined(CONFIG_PAGE_SIZE_4KB) 12# define PAGE_SHIFT 12 13#elif defined(CONFIG_PAGE_SIZE_8KB) 14# define PAGE_SHIFT 13 15#elif defined(CONFIG_PAGE_SIZE_16KB) 16# define PAGE_SHIFT 14 17#elif defined(CONFIG_PAGE_SIZE_64KB) 18# define PAGE_SHIFT 16 19#else 20# error "Bogus kernel page size?" 21#endif 22 23#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 24#define PAGE_MASK (~(PAGE_SIZE-1)) 25#define PTE_MASK PAGE_MASK 26 27#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 28#define HPAGE_SHIFT 16 29#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 30#define HPAGE_SHIFT 18 31#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 32#define HPAGE_SHIFT 20 33#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 34#define HPAGE_SHIFT 22 35#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 36#define HPAGE_SHIFT 26 37#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB) 38#define HPAGE_SHIFT 29 39#endif 40 41#ifdef CONFIG_HUGETLB_PAGE 42#define HPAGE_SIZE (1UL << HPAGE_SHIFT) 43#define HPAGE_MASK (~(HPAGE_SIZE-1)) 44#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 45#endif 46 47#ifndef __ASSEMBLY__ 48#include <asm/uncached.h> 49 50extern unsigned long shm_align_mask; 51extern unsigned long max_low_pfn, min_low_pfn; 52extern unsigned long memory_start, memory_end, memory_limit; 53 54static inline unsigned long 55pages_do_alias(unsigned long addr1, unsigned long addr2) 56{ 57 return (addr1 ^ addr2) & shm_align_mask; 58} 59 60#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 61extern void copy_page(void *to, void *from); 62 63struct page; 64struct vm_area_struct; 65 66extern void copy_user_highpage(struct page *to, struct page *from, 67 unsigned long vaddr, struct vm_area_struct *vma); 68#define __HAVE_ARCH_COPY_USER_HIGHPAGE 69extern void clear_user_highpage(struct page *page, unsigned long vaddr); 70#define clear_user_highpage clear_user_highpage 71 72/* 73 * These are used to make use of C type-checking.. 74 */ 75#ifdef CONFIG_X2TLB 76typedef struct { unsigned long pte_low, pte_high; } pte_t; 77typedef struct { unsigned long long pgprot; } pgprot_t; 78typedef struct { unsigned long long pgd; } pgd_t; 79#define pte_val(x) \ 80 ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 81#define __pte(x) \ 82 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 83#elif defined(CONFIG_SUPERH32) 84typedef struct { unsigned long pte_low; } pte_t; 85typedef struct { unsigned long pgprot; } pgprot_t; 86typedef struct { unsigned long pgd; } pgd_t; 87#define pte_val(x) ((x).pte_low) 88#define __pte(x) ((pte_t) { (x) } ) 89#else 90typedef struct { unsigned long long pte_low; } pte_t; 91typedef struct { unsigned long long pgprot; } pgprot_t; 92typedef struct { unsigned long pgd; } pgd_t; 93#define pte_val(x) ((x).pte_low) 94#define __pte(x) ((pte_t) { (x) } ) 95#endif 96 97#define pgd_val(x) ((x).pgd) 98#define pgprot_val(x) ((x).pgprot) 99 100#define __pgd(x) ((pgd_t) { (x) } ) 101#define __pgprot(x) ((pgprot_t) { (x) } ) 102 103typedef struct page *pgtable_t; 104 105#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) 106 107#endif /* !__ASSEMBLY__ */ 108 109/* 110 * __MEMORY_START and SIZE are the physical addresses and size of RAM. 111 */ 112#define __MEMORY_START CONFIG_MEMORY_START 113#define __MEMORY_SIZE CONFIG_MEMORY_SIZE 114 115/* 116 * PAGE_OFFSET is the virtual address of the start of kernel address 117 * space. 118 */ 119#define PAGE_OFFSET CONFIG_PAGE_OFFSET 120 121/* 122 * Virtual to physical RAM address translation. 123 * 124 * In 29 bit mode, the physical offset of RAM from address 0 is visible in 125 * the kernel virtual address space, and thus we don't have to take 126 * this into account when translating. However in 32 bit mode this offset 127 * is not visible (it is part of the PMB mapping) and so needs to be 128 * added or subtracted as required. 129 */ 130#ifdef CONFIG_PMB 131#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) 132#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) 133#else 134#define ___pa(x) ((x)-PAGE_OFFSET) 135#define ___va(x) ((x)+PAGE_OFFSET) 136#endif 137 138#ifndef __ASSEMBLY__ 139#define __pa(x) ___pa((unsigned long)x) 140#define __va(x) (void *)___va((unsigned long)x) 141#endif /* !__ASSEMBLY__ */ 142 143#ifdef CONFIG_UNCACHED_MAPPING 144#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) 145#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) 146#else 147#define UNCAC_ADDR(addr) ((addr)) 148#define CAC_ADDR(addr) ((addr)) 149#endif 150 151#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 152#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 153 154/* 155 * PFN = physical frame number (ie PFN 0 == physical address 0) 156 * PFN_START is the PFN of the first page of RAM. By defining this we 157 * don't have struct page entries for the portion of address space 158 * between physical address 0 and the start of RAM. 159 */ 160#define PFN_START (__MEMORY_START >> PAGE_SHIFT) 161#define ARCH_PFN_OFFSET (PFN_START) 162#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 163#ifdef CONFIG_FLATMEM 164#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn) 165#endif 166#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 167 168#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 169 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 170 171#include <asm-generic/memory_model.h> 172#include <asm-generic/getorder.h> 173 174/* vDSO support */ 175#ifdef CONFIG_VSYSCALL 176#define __HAVE_ARCH_GATE_AREA 177#endif 178 179/* 180 * Some drivers need to perform DMA into kmalloc'ed buffers 181 * and so we have to increase the kmalloc minalign for this. 182 */ 183#define ARCH_DMA_MINALIGN L1_CACHE_BYTES 184 185#ifdef CONFIG_SUPERH64 186/* 187 * While BYTES_PER_WORD == 4 on the current sh64 ABI, GCC will still 188 * happily generate {ld/st}.q pairs, requiring us to have 8-byte 189 * alignment to avoid traps. The kmalloc alignment is gauranteed by 190 * virtue of L1_CACHE_BYTES, requiring this to only be special cased 191 * for slab caches. 192 */ 193#define ARCH_SLAB_MINALIGN 8 194#endif 195 196#endif /* __ASM_SH_PAGE_H */ 197