pgtable.h (4305B)
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#define __P000 PAGE_NONE 93#define __P001 PAGE_READONLY 94#define __P010 PAGE_COPY 95#define __P011 PAGE_COPY 96#define __P100 PAGE_EXECREAD 97#define __P101 PAGE_EXECREAD 98#define __P110 PAGE_COPY 99#define __P111 PAGE_COPY 100 101#define __S000 PAGE_NONE 102#define __S001 PAGE_READONLY 103#define __S010 PAGE_WRITEONLY 104#define __S011 PAGE_SHARED 105#define __S100 PAGE_EXECREAD 106#define __S101 PAGE_EXECREAD 107#define __S110 PAGE_RWX 108#define __S111 PAGE_RWX 109 110typedef pte_t *pte_addr_t; 111 112#define kern_addr_valid(addr) (1) 113 114#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) 115 116struct vm_area_struct; 117struct mm_struct; 118 119extern void __update_cache(struct vm_area_struct *vma, 120 unsigned long address, pte_t pte); 121extern void __update_tlb(struct vm_area_struct *vma, 122 unsigned long address, pte_t pte); 123 124static inline void 125update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) 126{ 127 pte_t pte = *ptep; 128 __update_cache(vma, address, pte); 129 __update_tlb(vma, address, pte); 130} 131 132extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 133extern void paging_init(void); 134extern void page_table_range_init(unsigned long start, unsigned long end, 135 pgd_t *pgd); 136 137static inline bool __pte_access_permitted(pte_t pte, u64 prot) 138{ 139 return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot; 140} 141 142#ifdef CONFIG_X2TLB 143static inline bool pte_access_permitted(pte_t pte, bool write) 144{ 145 u64 prot = _PAGE_PRESENT; 146 147 prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ); 148 if (write) 149 prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE); 150 return __pte_access_permitted(pte, prot); 151} 152#else 153static inline bool pte_access_permitted(pte_t pte, bool write) 154{ 155 u64 prot = _PAGE_PRESENT | _PAGE_USER; 156 157 if (write) 158 prot |= _PAGE_RW; 159 return __pte_access_permitted(pte, prot); 160} 161#endif 162 163#define pte_access_permitted pte_access_permitted 164 165/* arch/sh/mm/mmap.c */ 166#define HAVE_ARCH_UNMAPPED_AREA 167#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 168 169#endif /* __ASM_SH_PGTABLE_H */