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 49 extern unsigned long shm_align_mask; 50 extern unsigned long max_low_pfn, min_low_pfn; 51 extern unsigned long memory_start, memory_end, memory_limit; 52 53 static inline unsigned long 54 pages_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) 60 extern void copy_page(void *to, void *from); 61 #define copy_user_page(to, from, vaddr, pg) __copy_user(to, from, PAGE_SIZE) 62 63 struct page; 64 struct vm_area_struct; 65 66 extern 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 69 extern 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 76 typedef struct { unsigned long pte_low, pte_high; } pte_t; 77 typedef struct { unsigned long long pgprot; } pgprot_t; 78 typedef 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 84 typedef struct { unsigned long pte_low; } pte_t; 85 typedef struct { unsigned long pgprot; } pgprot_t; 86 typedef 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 97 typedef 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 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 173 174 #include <asm-generic/memory_model.h> 175 #include <asm-generic/getorder.h> 176 177 /* 178 * Some drivers need to perform DMA into kmalloc'ed buffers 179 * and so we have to increase the kmalloc minalign for this. 180 */ 181 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES 182 183 #endif /* __ASM_SH_PAGE_H */ 184