| /* SPDX-License-Identifier: GPL-2.0 |
| * |
| * This file contains the functions and defines necessary to modify and |
| * use the SuperH page table tree. |
| * |
| * Copyright (C) 1999 Niibe Yutaka |
| * Copyright (C) 2002 - 2007 Paul Mundt |
| */ |
| #ifndef __ASM_SH_PGTABLE_H |
| #define __ASM_SH_PGTABLE_H |
| |
| #ifdef CONFIG_X2TLB |
| #include <asm/pgtable-3level.h> |
| #else |
| #include <asm/pgtable-2level.h> |
| #endif |
| #include <asm/page.h> |
| #include <asm/mmu.h> |
| |
| #ifndef __ASSEMBLY__ |
| #include <asm/addrspace.h> |
| #include <asm/fixmap.h> |
| |
| /* |
| * ZERO_PAGE is a global shared page that is always zero: used |
| * for zero-mapped memory areas etc.. |
| */ |
| extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; |
| #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| /* |
| * Effective and physical address definitions, to aid with sign |
| * extension. |
| */ |
| #define NEFF 32 |
| #define NEFF_SIGN (1LL << (NEFF - 1)) |
| #define NEFF_MASK (-1LL << NEFF) |
| |
| static inline unsigned long long neff_sign_extend(unsigned long val) |
| { |
| unsigned long long extended = val; |
| return (extended & NEFF_SIGN) ? (extended | NEFF_MASK) : extended; |
| } |
| |
| #ifdef CONFIG_29BIT |
| #define NPHYS 29 |
| #else |
| #define NPHYS 32 |
| #endif |
| |
| #define NPHYS_SIGN (1LL << (NPHYS - 1)) |
| #define NPHYS_MASK (-1LL << NPHYS) |
| |
| #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| |
| /* Entries per level */ |
| #define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE)) |
| |
| #define FIRST_USER_ADDRESS 0UL |
| |
| #define PHYS_ADDR_MASK29 0x1fffffff |
| #define PHYS_ADDR_MASK32 0xffffffff |
| |
| static inline unsigned long phys_addr_mask(void) |
| { |
| /* Is the MMU in 29bit mode? */ |
| if (__in_29bit_mode()) |
| return PHYS_ADDR_MASK29; |
| |
| return PHYS_ADDR_MASK32; |
| } |
| |
| #define PTE_PHYS_MASK (phys_addr_mask() & PAGE_MASK) |
| #define PTE_FLAGS_MASK (~(PTE_PHYS_MASK) << PAGE_SHIFT) |
| |
| #ifdef CONFIG_SUPERH32 |
| #define VMALLOC_START (P3SEG) |
| #else |
| #define VMALLOC_START (0xf0000000) |
| #endif |
| #define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) |
| |
| #if defined(CONFIG_SUPERH32) |
| #include <asm/pgtable_32.h> |
| #else |
| #include <asm/pgtable_64.h> |
| #endif |
| |
| /* |
| * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page |
| * protection for execute, and considers it the same as a read. Also, write |
| * permission implies read permission. This is the closest we can get.. |
| * |
| * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme, |
| * not only supporting separate execute, read, and write bits, but having |
| * completely separate permission bits for user and kernel space. |
| */ |
| /*xwr*/ |
| #define __P000 PAGE_NONE |
| #define __P001 PAGE_READONLY |
| #define __P010 PAGE_COPY |
| #define __P011 PAGE_COPY |
| #define __P100 PAGE_EXECREAD |
| #define __P101 PAGE_EXECREAD |
| #define __P110 PAGE_COPY |
| #define __P111 PAGE_COPY |
| |
| #define __S000 PAGE_NONE |
| #define __S001 PAGE_READONLY |
| #define __S010 PAGE_WRITEONLY |
| #define __S011 PAGE_SHARED |
| #define __S100 PAGE_EXECREAD |
| #define __S101 PAGE_EXECREAD |
| #define __S110 PAGE_RWX |
| #define __S111 PAGE_RWX |
| |
| typedef pte_t *pte_addr_t; |
| |
| #define kern_addr_valid(addr) (1) |
| |
| #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) |
| |
| struct vm_area_struct; |
| struct mm_struct; |
| |
| extern void __update_cache(struct vm_area_struct *vma, |
| unsigned long address, pte_t pte); |
| extern void __update_tlb(struct vm_area_struct *vma, |
| unsigned long address, pte_t pte); |
| |
| static inline void |
| update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) |
| { |
| pte_t pte = *ptep; |
| __update_cache(vma, address, pte); |
| __update_tlb(vma, address, pte); |
| } |
| |
| extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| extern void paging_init(void); |
| extern void page_table_range_init(unsigned long start, unsigned long end, |
| pgd_t *pgd); |
| |
| static inline bool __pte_access_permitted(pte_t pte, u64 prot) |
| { |
| return (pte_val(pte) & (prot | _PAGE_SPECIAL)) == prot; |
| } |
| |
| #ifdef CONFIG_X2TLB |
| static inline bool pte_access_permitted(pte_t pte, bool write) |
| { |
| u64 prot = _PAGE_PRESENT; |
| |
| prot |= _PAGE_EXT(_PAGE_EXT_KERN_READ | _PAGE_EXT_USER_READ); |
| if (write) |
| prot |= _PAGE_EXT(_PAGE_EXT_KERN_WRITE | _PAGE_EXT_USER_WRITE); |
| return __pte_access_permitted(pte, prot); |
| } |
| #elif defined(CONFIG_SUPERH64) |
| static inline bool pte_access_permitted(pte_t pte, bool write) |
| { |
| u64 prot = _PAGE_PRESENT | _PAGE_USER | _PAGE_READ; |
| |
| if (write) |
| prot |= _PAGE_WRITE; |
| return __pte_access_permitted(pte, prot); |
| } |
| #else |
| static inline bool pte_access_permitted(pte_t pte, bool write) |
| { |
| u64 prot = _PAGE_PRESENT | _PAGE_USER; |
| |
| if (write) |
| prot |= _PAGE_RW; |
| return __pte_access_permitted(pte, prot); |
| } |
| #endif |
| |
| #define pte_access_permitted pte_access_permitted |
| |
| /* arch/sh/mm/mmap.c */ |
| #define HAVE_ARCH_UNMAPPED_AREA |
| #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN |
| |
| #include <asm-generic/pgtable.h> |
| |
| #endif /* __ASM_SH_PGTABLE_H */ |