mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-16 23:45:31 +08:00
ca5999fde0
The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
172 lines
4.2 KiB
C
172 lines
4.2 KiB
C
/* 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)
|
|
|
|
#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 */
|