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 #include <vdso/page.h> 12 13 #define PTE_MASK PAGE_MASK 14 15 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 16 #define HPAGE_SHIFT 16 17 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 18 #define HPAGE_SHIFT 18 19 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB) 20 #define HPAGE_SHIFT 20 21 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB) 22 #define HPAGE_SHIFT 22 23 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB) 24 #define HPAGE_SHIFT 26 25 #endif 26 27 #ifdef CONFIG_HUGETLB_PAGE 28 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 29 #define HPAGE_MASK (~(HPAGE_SIZE-1)) 30 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 31 #endif 32 33 #ifndef __ASSEMBLY__ 34 #include <asm/uncached.h> 35 36 extern unsigned long shm_align_mask; 37 extern unsigned long max_low_pfn, min_low_pfn; 38 extern unsigned long memory_start, memory_end, memory_limit; 39 40 static inline unsigned long 41 pages_do_alias(unsigned long addr1, unsigned long addr2) 42 { 43 return (addr1 ^ addr2) & shm_align_mask; 44 } 45 46 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 47 extern void copy_page(void *to, void *from); 48 #define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) 49 50 struct page; 51 struct vm_area_struct; 52 53 extern void copy_user_highpage(struct page *to, struct page *from, 54 unsigned long vaddr, struct vm_area_struct *vma); 55 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 56 extern void clear_user_highpage(struct page *page, unsigned long vaddr); 57 #define clear_user_highpage clear_user_highpage 58 59 /* 60 * These are used to make use of C type-checking.. 61 */ 62 #ifdef CONFIG_X2TLB 63 typedef struct { unsigned long pte_low, pte_high; } pte_t; 64 typedef struct { unsigned long long pgprot; } pgprot_t; 65 typedef struct { unsigned long long pgd; } pgd_t; 66 #define pte_val(x) \ 67 ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 68 #define __pte(x) \ 69 ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 70 #else 71 typedef struct { unsigned long pte_low; } pte_t; 72 typedef struct { unsigned long pgprot; } pgprot_t; 73 typedef struct { unsigned long pgd; } pgd_t; 74 #define pte_val(x) ((x).pte_low) 75 #define __pte(x) ((pte_t) { (x) } ) 76 #endif 77 78 #define pgd_val(x) ((x).pgd) 79 #define pgprot_val(x) ((x).pgprot) 80 81 #define __pgd(x) ((pgd_t) { (x) } ) 82 #define __pgprot(x) ((pgprot_t) { (x) } ) 83 84 typedef struct page *pgtable_t; 85 86 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK) 87 88 #endif /* !__ASSEMBLY__ */ 89 90 /* 91 * __MEMORY_START and SIZE are the physical addresses and size of RAM. 92 */ 93 #define __MEMORY_START CONFIG_MEMORY_START 94 #define __MEMORY_SIZE CONFIG_MEMORY_SIZE 95 96 /* 97 * PHYSICAL_OFFSET is the offset in physical memory where the base 98 * of the kernel is loaded. 99 */ 100 #ifdef CONFIG_PHYSICAL_START 101 #define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START) 102 #else 103 #define PHYSICAL_OFFSET 0 104 #endif 105 106 /* 107 * PAGE_OFFSET is the virtual address of the start of kernel address 108 * space. 109 */ 110 #define PAGE_OFFSET CONFIG_PAGE_OFFSET 111 112 /* 113 * Virtual to physical RAM address translation. 114 * 115 * In 29 bit mode, the physical offset of RAM from address 0 is visible in 116 * the kernel virtual address space, and thus we don't have to take 117 * this into account when translating. However in 32 bit mode this offset 118 * is not visible (it is part of the PMB mapping) and so needs to be 119 * added or subtracted as required. 120 */ 121 #ifdef CONFIG_PMB 122 #define ___pa(x) ((x)-PAGE_OFFSET+__MEMORY_START) 123 #define ___va(x) ((x)+PAGE_OFFSET-__MEMORY_START) 124 #else 125 #define ___pa(x) ((x)-PAGE_OFFSET) 126 #define ___va(x) ((x)+PAGE_OFFSET) 127 #endif 128 129 #ifndef __ASSEMBLY__ 130 #define __pa(x) ___pa((unsigned long)x) 131 #define __va(x) (void *)___va((unsigned long)x) 132 #endif /* !__ASSEMBLY__ */ 133 134 #ifdef CONFIG_UNCACHED_MAPPING 135 #if defined(CONFIG_29BIT) 136 #define UNCAC_ADDR(addr) P2SEGADDR(addr) 137 #define CAC_ADDR(addr) P1SEGADDR(addr) 138 #else 139 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + uncached_start) 140 #define CAC_ADDR(addr) ((addr) - uncached_start + PAGE_OFFSET) 141 #endif 142 #else 143 #define UNCAC_ADDR(addr) ((addr)) 144 #define CAC_ADDR(addr) ((addr)) 145 #endif 146 147 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 148 149 /* 150 * PFN = physical frame number (ie PFN 0 == physical address 0) 151 * PFN_START is the PFN of the first page of RAM. By defining this we 152 * don't have struct page entries for the portion of address space 153 * between physical address 0 and the start of RAM. 154 */ 155 #define PFN_START (__MEMORY_START >> PAGE_SHIFT) 156 #define ARCH_PFN_OFFSET (PFN_START) 157 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 158 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 159 160 #include <asm-generic/memory_model.h> 161 #include <asm-generic/getorder.h> 162 163 #endif /* __ASM_SH_PAGE_H */ 164