page.h (5419B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __ASM_SH_PAGE_H 3#define __ASM_SH_PAGE_H 4 5/* 6 * Copyright (C) 1999 Niibe Yutaka 7 */ 8 9#include <linux/const.h> 10 11/* PAGE_SHIFT determines the page size */ 12#if defined(CONFIG_PAGE_SIZE_4KB) 13# define PAGE_SHIFT 12 14#elif defined(CONFIG_PAGE_SIZE_8KB) 15# define PAGE_SHIFT 13 16#elif defined(CONFIG_PAGE_SIZE_16KB) 17# define PAGE_SHIFT 14 18#elif defined(CONFIG_PAGE_SIZE_64KB) 19# define PAGE_SHIFT 16 20#else 21# error "Bogus kernel page size?" 22#endif 23 24#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 25#define PAGE_MASK (~(PAGE_SIZE-1)) 26#define PTE_MASK PAGE_MASK 27 28#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 29#define HPAGE_SHIFT 16 30#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 31#define HPAGE_SHIFT 18 32#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 33#define HPAGE_SHIFT 20 34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 35#define HPAGE_SHIFT 22 36#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 37#define HPAGE_SHIFT 26 38#endif 39 40#ifdef CONFIG_HUGETLB_PAGE 41#define HPAGE_SIZE (1UL << HPAGE_SHIFT) 42#define HPAGE_MASK (~(HPAGE_SIZE-1)) 43#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 44#endif 45 46#ifndef __ASSEMBLY__ 47#include <asm/uncached.h> 48 49extern unsigned long shm_align_mask; 50extern unsigned long max_low_pfn, min_low_pfn; 51extern unsigned long memory_start, memory_end, memory_limit; 52 53static inline unsigned long 54pages_do_alias(unsigned long addr1, unsigned long addr2) 55{ 56 return (addr1 ^ addr2) & shm_align_mask; 57} 58 59#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 60extern void copy_page(void *to, void *from); 61#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) 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#else 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#endif 90 91#define pgd_val(x) ((x).pgd) 92#define pgprot_val(x) ((x).pgprot) 93 94#define __pgd(x) ((pgd_t) { (x) } ) 95#define __pgprot(x) ((pgprot_t) { (x) } ) 96 97typedef struct page *pgtable_t; 98 99#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) 100 101#endif /* !__ASSEMBLY__ */ 102 103/* 104 * __MEMORY_START and SIZE are the physical addresses and size of RAM. 105 */ 106#define __MEMORY_START CONFIG_MEMORY_START 107#define __MEMORY_SIZE CONFIG_MEMORY_SIZE 108 109/* 110 * PHYSICAL_OFFSET is the offset in physical memory where the base 111 * of the kernel is loaded. 112 */ 113#ifdef CONFIG_PHYSICAL_START 114#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START) 115#else 116#define PHYSICAL_OFFSET 0 117#endif 118 119/* 120 * PAGE_OFFSET is the virtual address of the start of kernel address 121 * space. 122 */ 123#define PAGE_OFFSET CONFIG_PAGE_OFFSET 124 125/* 126 * Virtual to physical RAM address translation. 127 * 128 * In 29 bit mode, the physical offset of RAM from address 0 is visible in 129 * the kernel virtual address space, and thus we don't have to take 130 * this into account when translating. However in 32 bit mode this offset 131 * is not visible (it is part of the PMB mapping) and so needs to be 132 * added or subtracted as required. 133 */ 134#ifdef CONFIG_PMB 135#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) 136#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) 137#else 138#define ___pa(x) ((x)-PAGE_OFFSET) 139#define ___va(x) ((x)+PAGE_OFFSET) 140#endif 141 142#ifndef __ASSEMBLY__ 143#define __pa(x) ___pa((unsigned long)x) 144#define __va(x) (void *)___va((unsigned long)x) 145#endif /* !__ASSEMBLY__ */ 146 147#ifdef CONFIG_UNCACHED_MAPPING 148#if defined(CONFIG_29BIT) 149#define UNCAC_ADDR(addr) P2SEGADDR(addr) 150#define CAC_ADDR(addr) P1SEGADDR(addr) 151#else 152#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) 153#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) 154#endif 155#else 156#define UNCAC_ADDR(addr) ((addr)) 157#define CAC_ADDR(addr) ((addr)) 158#endif 159 160#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 161#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 162 163/* 164 * PFN = physical frame number (ie PFN 0 == physical address 0) 165 * PFN_START is the PFN of the first page of RAM. By defining this we 166 * don't have struct page entries for the portion of address space 167 * between physical address 0 and the start of RAM. 168 */ 169#define PFN_START (__MEMORY_START >> PAGE_SHIFT) 170#define ARCH_PFN_OFFSET (PFN_START) 171#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 172#ifdef CONFIG_FLATMEM 173#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn) 174#endif 175#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 176 177#include <asm-generic/memory_model.h> 178#include <asm-generic/getorder.h> 179 180/* 181 * Some drivers need to perform DMA into kmalloc'ed buffers 182 * and so we have to increase the kmalloc minalign for this. 183 */ 184#define ARCH_DMA_MINALIGN L1_CACHE_BYTES 185 186#endif /* __ASM_SH_PAGE_H */