forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
169 lines
4.2 KiB
169 lines
4.2 KiB
/* 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*/ |
|
#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); |
|
} |
|
#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 */
|
|
|