1/* SPDX-License-Identifier: GPL-2.0 2 * 3 * This file contains the functions and defines necessary to modify and 4 * use the SuperH page table tree. 5 * 6 * Copyright (C) 1999 Niibe Yutaka 7 * Copyright (C) 2002 - 2007 Paul Mundt 8 */ 9#ifndef __ASM_SH_PGTABLE_H 10#define __ASM_SH_PGTABLE_H 11 12#ifdef CONFIG_X2TLB 13#include <asm/pgtable-3level.h> 14#else 15#include <asm/pgtable-2level.h> 16#endif 17#include <asm/page.h> 18#include <asm/mmu.h> 19 20#ifndef __ASSEMBLY__ 21#include <asm/addrspace.h> 22#include <asm/fixmap.h> 23 24/* 25 * ZERO_PAGE is a global shared page that is always zero: used 26 * for zero-mapped memory areas etc.. 27 */ 28extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 29#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 30 31#endif /* !__ASSEMBLY__ */ 32 33/* 34 * Effective and physical address definitions, to aid with sign 35 * extension. 36 */ 37#define NEFF 32 38#define NEFF_SIGN (1LL << (NEFF - 1)) 39#define NEFF_MASK (-1LL << NEFF) 40 41static inline unsigned long long neff_sign_extend(unsigned long val) 42{ 43 unsigned long long extended = val; 44 return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended; 45} 46 47#ifdef CONFIG_29BIT 48#define NPHYS 29 49#else 50#define NPHYS 32 51#endif 52 53#define NPHYS_SIGN (1LL << (NPHYS - 1)) 54#define NPHYS_MASK (-1LL << NPHYS) 55 56#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 57#define PGDIR_MASK (~(PGDIR_SIZE-1)) 58 59/* Entries per level */ 60#define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE)) 61 62#define PHYS_ADDR_MASK29 0x1fffffff 63#define PHYS_ADDR_MASK32 0xffffffff 64 65static inline unsigned long phys_addr_mask(void) 66{ 67 /* Is the MMU in 29bit mode? */ 68 if (__in_29bit_mode()) 69 return PHYS_ADDR_MASK29; 70 71 return PHYS_ADDR_MASK32; 72} 73 74#define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK) 75#define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT) 76 77#define VMALLOC_START (P3SEG) 78#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) 79 80#include <asm/pgtable_32.h> 81 82/* 83 * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page 84 * protection for execute, and considers it the same as a read. Also, write 85 * permission implies read permission. This is the closest we can get.. 86 * 87 * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme, 88 * not only supporting separate execute, read, and write bits, but having 89 * completely separate permission bits for user and kernel space. 90 */ 91 /*xwr*/ 92 93typedef pte_t *pte_addr_t; 94 95#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) 96 97struct vm_area_struct; 98struct mm_struct; 99 100extern void __update_cache(struct vm_area_struct *vma, 101 unsigned long address, pte_t pte); 102extern void __update_tlb(struct vm_area_struct *vma, 103 unsigned long address, pte_t pte); 104 105static inline void update_mmu_cache_range(struct vm_fault *vmf, 106 struct vm_area_struct *vma, unsigned long address, 107 pte_t *ptep, unsigned int nr) 108{ 109 pte_t pte = *ptep; 110 __update_cache(vma, address, pte); 111 __update_tlb(vma, address, pte); 112} 113#define update_mmu_cache(vma, addr, ptep) \ 114 update_mmu_cache_range(NULL, vma, addr, ptep, 1) 115 116extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 117extern void paging_init(void); 118extern void page_table_range_init(unsigned long start, unsigned long end, 119 pgd_t *pgd); 120 121static inline bool __pte_access_permitted(pte_t pte, u64 prot) 122{ 123 return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot; 124} 125 126#ifdef CONFIG_X2TLB 127static inline bool pte_access_permitted(pte_t pte, bool write) 128{ 129 u64 prot = _PAGE_PRESENT; 130 131 prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ); 132 if (write) 133 prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE); 134 return __pte_access_permitted(pte, prot); 135} 136#else 137static inline bool pte_access_permitted(pte_t pte, bool write) 138{ 139 u64 prot = _PAGE_PRESENT | _PAGE_USER; 140 141 if (write) 142 prot |= _PAGE_RW; 143 return __pte_access_permitted(pte, prot); 144} 145#endif 146 147#define pte_access_permitted pte_access_permitted 148 149/* arch/sh/mm/mmap.c */ 150#define HAVE_ARCH_UNMAPPED_AREA 151#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 152 153#endif /* __ASM_SH_PGTABLE_H */ 154