pgtable.h

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/*
 * 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
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file "COPYING" in the main directory of this
 * archive for more details.
 */
#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  0

#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 io_remap_pfn_range(vma, vaddr, pfn, size, prot)     \
        remap_pfn_range(vma, vaddr, pfn, size, prot)

#define pte_pfn(x)      ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))

/*
 * Initialise the page table caches
 */
extern void pgtable_cache_init(void);

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);

/* arch/sh/mm/mmap.c */
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN

#define __HAVE_ARCH_PTE_SPECIAL

#include <asm-generic/pgtable.h>

#endif /* __ASM_SH_PGTABLE_H */