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Diffstat (limited to 'arch/sh/include/asm/pgtable.h')
| -rw-r--r-- | arch/sh/include/asm/pgtable.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h new file mode 100644 index 000000000..6fb9ec54c --- /dev/null +++ b/arch/sh/include/asm/pgtable.h @@ -0,0 +1,152 @@ +/* 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 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) + +#define VMALLOC_START (P3SEG) +#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) + +#include <asm/pgtable_32.h> + +/* + * 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*/ + +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); +} +#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 + +#endif /* __ASM_SH_PGTABLE_H */ |