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#define PAGE_SHIFT CONFIG_PAGE_SHIFT 13#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 14#define PAGE_MASK (~(PAGE_SIZE-1)) 15#define PTE_MASK PAGE_MASK 16 17#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 18#define HPAGE_SHIFT 16 19#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 20#define HPAGE_SHIFT 18 21#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 22#define HPAGE_SHIFT 20 23#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 24#define HPAGE_SHIFT 22 25#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 26#define HPAGE_SHIFT 26 27#endif 28 29#ifdef CONFIG_HUGETLB_PAGE 30#define HPAGE_SIZE (1UL << HPAGE_SHIFT) 31#define HPAGE_MASK (~(HPAGE_SIZE-1)) 32#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 33#endif 34 35#ifndef __ASSEMBLY__ 36#include <asm/uncached.h> 37 38extern unsigned long shm_align_mask; 39extern unsigned long max_low_pfn, min_low_pfn; 40extern unsigned long memory_start, memory_end, memory_limit; 41 42static inline unsigned long 43pages_do_alias(unsigned long addr1, unsigned long addr2) 44{ 45 return (addr1 ^ addr2) & shm_align_mask; 46} 47 48#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 49extern void copy_page(void *to, void *from); 50#define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) 51 52struct page; 53struct vm_area_struct; 54 55extern void copy_user_highpage(struct page *to, struct page *from, 56 unsigned long vaddr, struct vm_area_struct *vma); 57#define __HAVE_ARCH_COPY_USER_HIGHPAGE 58extern void clear_user_highpage(struct page *page, unsigned long vaddr); 59#define clear_user_highpage clear_user_highpage 60 61/* 62 * These are used to make use of C type-checking.. 63 */ 64#ifdef CONFIG_X2TLB 65typedef struct { unsigned long pte_low, pte_high; } pte_t; 66typedef struct { unsigned long long pgprot; } pgprot_t; 67typedef struct { unsigned long long pgd; } pgd_t; 68#define pte_val(x) \ 69 ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 70#define __pte(x) \ 71 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 72#else 73typedef struct { unsigned long pte_low; } pte_t; 74typedef struct { unsigned long pgprot; } pgprot_t; 75typedef struct { unsigned long pgd; } pgd_t; 76#define pte_val(x) ((x).pte_low) 77#define __pte(x) ((pte_t) { (x) } ) 78#endif 79 80#define pgd_val(x) ((x).pgd) 81#define pgprot_val(x) ((x).pgprot) 82 83#define __pgd(x) ((pgd_t) { (x) } ) 84#define __pgprot(x) ((pgprot_t) { (x) } ) 85 86typedef struct page *pgtable_t; 87 88#define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) 89 90#endif /* !__ASSEMBLY__ */ 91 92/* 93 * __MEMORY_START and SIZE are the physical addresses and size of RAM. 94 */ 95#define __MEMORY_START CONFIG_MEMORY_START 96#define __MEMORY_SIZE CONFIG_MEMORY_SIZE 97 98/* 99 * PHYSICAL_OFFSET is the offset in physical memory where the base 100 * of the kernel is loaded. 101 */ 102#ifdef CONFIG_PHYSICAL_START 103#define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START) 104#else 105#define PHYSICAL_OFFSET 0 106#endif 107 108/* 109 * PAGE_OFFSET is the virtual address of the start of kernel address 110 * space. 111 */ 112#define PAGE_OFFSET CONFIG_PAGE_OFFSET 113 114/* 115 * Virtual to physical RAM address translation. 116 * 117 * In 29 bit mode, the physical offset of RAM from address 0 is visible in 118 * the kernel virtual address space, and thus we don't have to take 119 * this into account when translating. However in 32 bit mode this offset 120 * is not visible (it is part of the PMB mapping) and so needs to be 121 * added or subtracted as required. 122 */ 123#ifdef CONFIG_PMB 124#define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) 125#define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) 126#else 127#define ___pa(x) ((x)-PAGE_OFFSET) 128#define ___va(x) ((x)+PAGE_OFFSET) 129#endif 130 131#ifndef __ASSEMBLY__ 132#define __pa(x) ___pa((unsigned long)x) 133#define __va(x) (void *)___va((unsigned long)x) 134#endif /* !__ASSEMBLY__ */ 135 136#ifdef CONFIG_UNCACHED_MAPPING 137#if defined(CONFIG_29BIT) 138#define UNCAC_ADDR(addr) P2SEGADDR(addr) 139#define CAC_ADDR(addr) P1SEGADDR(addr) 140#else 141#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) 142#define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) 143#endif 144#else 145#define UNCAC_ADDR(addr) ((addr)) 146#define CAC_ADDR(addr) ((addr)) 147#endif 148 149#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 150#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 151 152/* 153 * PFN = physical frame number (ie PFN 0 == physical address 0) 154 * PFN_START is the PFN of the first page of RAM. By defining this we 155 * don't have struct page entries for the portion of address space 156 * between physical address 0 and the start of RAM. 157 */ 158#define PFN_START (__MEMORY_START >> PAGE_SHIFT) 159#define ARCH_PFN_OFFSET (PFN_START) 160#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 161#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 162 163#include <asm-generic/memory_model.h> 164#include <asm-generic/getorder.h> 165 166#endif /* __ASM_SH_PAGE_H */ 167