344 lines
13 KiB
C
344 lines
13 KiB
C
/*
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* This file contains the functions and defines necessary to modify and
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* use the SuperH page table tree.
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2005 Paul Mundt
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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*/
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#ifndef __ASM_SH_PGTABLE_H
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#define __ASM_SH_PGTABLE_H
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#include <asm-generic/pgtable-nopmd.h>
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#include <asm/page.h>
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#define PTRS_PER_PGD 1024
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#ifndef __ASSEMBLY__
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#include <asm/addrspace.h>
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#include <asm/fixmap.h>
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extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
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extern void paging_init(void);
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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#endif /* !__ASSEMBLY__ */
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/* traditional two-level paging structure */
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#define PGDIR_SHIFT 22
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PTE 1024
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#define PMD_SIZE (1UL << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
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#define FIRST_USER_ADDRESS 0
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#define PTE_PHYS_MASK 0x1ffff000
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/*
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* First 1MB map is used by fixed purpose.
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* Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
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*/
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#define VMALLOC_START (P3SEG+0x00100000)
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#define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE)
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/*
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* Linux PTEL encoding.
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*
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* Hardware and software bit definitions for the PTEL value:
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*
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* - Bits 0 and 7 are reserved on SH-3 (_PAGE_WT and _PAGE_SZ1 on SH-4).
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*
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* - Bit 1 is the SH-bit, but is unused on SH-3 due to an MMU bug (the
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* hardware PTEL value can't have the SH-bit set when MMUCR.IX is set,
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* which is the default in cpu-sh3/mmu_context.h:MMU_CONTROL_INIT).
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*
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* In order to keep this relatively clean, do not use these for defining
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* SH-3 specific flags until all of the other unused bits have been
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* exhausted.
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*
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* - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE.
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*
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* - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages.
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* Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused.
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*
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* - Bits 31, 30, and 29 remain unused by everyone and can be used for future
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* software flags, although care must be taken to update _PAGE_CLEAR_FLAGS.
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*/
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#define _PAGE_WT 0x001 /* WT-bit on SH-4, 0 on SH-3 */
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#define _PAGE_HW_SHARED 0x002 /* SH-bit : shared among processes */
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#define _PAGE_DIRTY 0x004 /* D-bit : page changed */
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#define _PAGE_CACHABLE 0x008 /* C-bit : cachable */
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#define _PAGE_SZ0 0x010 /* SZ0-bit : Size of page */
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#define _PAGE_RW 0x020 /* PR0-bit : write access allowed */
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#define _PAGE_USER 0x040 /* PR1-bit : user space access allowed */
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#define _PAGE_SZ1 0x080 /* SZ1-bit : Size of page (on SH-4) */
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#define _PAGE_PRESENT 0x100 /* V-bit : page is valid */
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#define _PAGE_PROTNONE 0x200 /* software: if not present */
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#define _PAGE_ACCESSED 0x400 /* software: page referenced */
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#define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */
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/* software: moves to PTEA.TC (Timing Control) */
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#define _PAGE_PCC_AREA5 0x00000000 /* use BSC registers for area5 */
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#define _PAGE_PCC_AREA6 0x80000000 /* use BSC registers for area6 */
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/* software: moves to PTEA.SA[2:0] (Space Attributes) */
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#define _PAGE_PCC_IODYN 0x00000001 /* IO space, dynamically sized bus */
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#define _PAGE_PCC_IO8 0x20000000 /* IO space, 8 bit bus */
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#define _PAGE_PCC_IO16 0x20000001 /* IO space, 16 bit bus */
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#define _PAGE_PCC_COM8 0x40000000 /* Common Memory space, 8 bit bus */
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#define _PAGE_PCC_COM16 0x40000001 /* Common Memory space, 16 bit bus */
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#define _PAGE_PCC_ATR8 0x60000000 /* Attribute Memory space, 8 bit bus */
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#define _PAGE_PCC_ATR16 0x60000001 /* Attribute Memory space, 6 bit bus */
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/* Mask which drops unused bits from the PTEL value */
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#ifdef CONFIG_CPU_SH3
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#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED| \
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_PAGE_FILE | _PAGE_SZ1 | \
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_PAGE_HW_SHARED)
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#else
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#define _PAGE_CLEAR_FLAGS (_PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_FILE)
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#endif
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#define _PAGE_FLAGS_HARDWARE_MASK (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
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/* Hardware flags: SZ0=1 (4k-byte) */
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#define _PAGE_FLAGS_HARD _PAGE_SZ0
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define _PAGE_SZHUGE (_PAGE_SZ1)
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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#define _PAGE_SZHUGE (_PAGE_SZ0 | _PAGE_SZ1)
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#endif
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#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
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#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY)
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_MMU
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_NOCACHE \
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__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
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#define PAGE_KERNEL_PCC(slot, type) \
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__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
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#else /* no mmu */
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#define PAGE_NONE __pgprot(0)
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#define PAGE_SHARED __pgprot(0)
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#define PAGE_COPY __pgprot(0)
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#define PAGE_READONLY __pgprot(0)
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#define PAGE_KERNEL __pgprot(0)
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#define PAGE_KERNEL_NOCACHE __pgprot(0)
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#define PAGE_KERNEL_RO __pgprot(0)
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#define PAGE_KERNEL_PCC __pgprot(0)
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#endif
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#endif /* __ASSEMBLY__ */
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/*
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* As i386 and MIPS, SuperH can't do page protection for execute, and
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* considers that the same as a read. Also, write permissions imply
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* read permissions. This is the closest we can get..
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*/
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#define __P000 PAGE_NONE
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#define __P001 PAGE_READONLY
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#define __P010 PAGE_COPY
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#define __P011 PAGE_COPY
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#define __P100 PAGE_READONLY
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#define __P101 PAGE_READONLY
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#define __P110 PAGE_COPY
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#define __P111 PAGE_COPY
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#define __S000 PAGE_NONE
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#define __S001 PAGE_READONLY
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#define __S010 PAGE_SHARED
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#define __S011 PAGE_SHARED
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#define __S100 PAGE_READONLY
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#define __S101 PAGE_READONLY
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#define __S110 PAGE_SHARED
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#define __S111 PAGE_SHARED
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#ifndef __ASSEMBLY__
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/*
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* Certain architectures need to do special things when PTEs
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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/*
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* (pmds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
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#define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
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#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
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#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
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#define pte_none(x) (!pte_val(x))
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#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
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#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
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#define pmd_none(x) (!pmd_val(x))
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#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
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#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
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#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
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#define pte_page(x) phys_to_page(pte_val(x)&PTE_PHYS_MASK)
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/*
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* The following only work if pte_present() is true.
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* Undefined behaviour if not..
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*/
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static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
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static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
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static inline int pte_dirty(pte_t pte){ return pte_val(pte) & _PAGE_DIRTY; }
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static inline int pte_young(pte_t pte){ return pte_val(pte) & _PAGE_ACCESSED; }
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static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
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static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
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static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
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static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
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static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
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static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
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static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
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static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
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static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
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static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
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static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
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static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
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static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
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#ifdef CONFIG_HUGETLB_PAGE
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static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
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#endif
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/*
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* Macro and implementation to make a page protection as uncachable.
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*/
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot &= ~_PAGE_CACHABLE;
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return __pgprot(prot);
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}
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#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
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/*
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* Conversion functions: convert a page and protection to a page entry,
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* and a page entry and page directory to the page they refer to.
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*
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* extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
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*/
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#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
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static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
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{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
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#define pmd_page_vaddr(pmd) \
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((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
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#define pmd_page(pmd) \
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(phys_to_page(pmd_val(pmd)))
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/* to find an entry in a page-table-directory. */
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
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#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
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/* to find an entry in a kernel page-table-directory */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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/* Find an entry in the third-level page table.. */
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#define pte_index(address) \
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((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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#define pte_offset_kernel(dir, address) \
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((pte_t *) pmd_page_vaddr(*(dir)) + pte_index(address))
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#define pte_offset_map(dir, address) pte_offset_kernel(dir, address)
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#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
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#define pte_unmap(pte) do { } while (0)
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#define pte_unmap_nested(pte) do { } while (0)
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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struct vm_area_struct;
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extern void update_mmu_cache(struct vm_area_struct * vma,
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unsigned long address, pte_t pte);
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/* Encode and de-code a swap entry */
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/*
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* NOTE: We should set ZEROs at the position of _PAGE_PRESENT
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* and _PAGE_PROTNONE bits
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*/
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#define __swp_type(x) ((x).val & 0xff)
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#define __swp_offset(x) ((x).val >> 10)
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#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 })
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/*
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* Encode and decode a nonlinear file mapping entry
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*/
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#define PTE_FILE_MAX_BITS 29
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#define pte_to_pgoff(pte) (pte_val(pte) >> 1)
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#define pgoff_to_pte(off) ((pte_t) { ((off) << 1) | _PAGE_FILE })
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typedef pte_t *pte_addr_t;
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#define kern_addr_valid(addr) (1)
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#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
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remap_pfn_range(vma, vaddr, pfn, size, prot)
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#define MK_IOSPACE_PFN(space, pfn) (pfn)
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#define GET_IOSPACE(pfn) 0
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#define GET_PFN(pfn) (pfn)
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struct mm_struct;
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/*
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* No page table caches to initialise
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*/
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#define pgtable_cache_init() do { } while (0)
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#ifndef CONFIG_MMU
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extern unsigned int kobjsize(const void *objp);
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#endif /* !CONFIG_MMU */
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#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
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#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
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extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
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#endif
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#include <asm-generic/pgtable.h>
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_SH_PAGE_H */
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