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/* 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 */
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