311 lines
11 KiB
C
311 lines
11 KiB
C
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#ifndef __ASM_SH_PGTABLE_64_H
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#define __ASM_SH_PGTABLE_64_H
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/*
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* include/asm-sh/pgtable_64.h
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*
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* This file contains the functions and defines necessary to modify and use
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* the SuperH page table tree.
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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* Copyright (C) 2003, 2004 Paul Mundt
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* Copyright (C) 2003, 2004 Richard Curnow
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/threads.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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/*
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* Error outputs.
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*/
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %016Lx.\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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/*
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* Table setting routines. Used within arch/mm only.
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*/
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
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static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
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{
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unsigned long long x = ((unsigned long long) pteval.pte_low);
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unsigned long long *xp = (unsigned long long *) pteptr;
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/*
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* Sign-extend based on NPHYS.
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*/
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*(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x;
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}
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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/*
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* PGD defines. Top level.
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*/
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/* To find an entry in a generic PGD. */
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#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
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#define __pgd_offset(address) pgd_index(address)
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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 PGD. */
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#define pgd_offset_k(address) pgd_offset(&init_mm, address)
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#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
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#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
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/*
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* PMD level access routines. Same notes as above.
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*/
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#define _PMD_EMPTY 0x0
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/* Either the PMD is empty or present, it's not paged out */
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#define pmd_present(pmd_entry) (pmd_val(pmd_entry) & _PAGE_PRESENT)
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#define pmd_clear(pmd_entry_p) (set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
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#define pmd_none(pmd_entry) (pmd_val((pmd_entry)) == _PMD_EMPTY)
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#define pmd_bad(pmd_entry) ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
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#define pmd_page_vaddr(pmd_entry) \
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((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))
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#define pmd_page(pmd) \
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(virt_to_page(pmd_val(pmd)))
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/* PMD to PTE dereferencing */
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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(address) pte_index(address)
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#define pte_offset_kernel(dir, addr) \
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((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + pte_index((addr)))
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#define pte_offset_map(dir,addr) pte_offset_kernel(dir, addr)
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#define pte_unmap(pte) do { } while (0)
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#ifndef __ASSEMBLY__
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/*
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* PTEL coherent flags.
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* See Chapter 17 ST50 CPU Core Volume 1, Architecture.
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*/
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/* The bits that are required in the SH-5 TLB are placed in the h/w-defined
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positions, to avoid expensive bit shuffling on every refill. The remaining
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bits are used for s/w purposes and masked out on each refill.
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Note, the PTE slots are used to hold data of type swp_entry_t when a page is
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swapped out. Only the _PAGE_PRESENT flag is significant when the page is
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swapped out, and it must be placed so that it doesn't overlap either the
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type or offset fields of swp_entry_t. For x86, offset is at [31:8] and type
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at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t. This
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scheme doesn't map to SH-5 because bit [0] controls cacheability. So bit
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[2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
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into 2 pieces. That is handled by SWP_ENTRY and SWP_TYPE below. */
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#define _PAGE_WT 0x001 /* CB0: if cacheable, 1->write-thru, 0->write-back */
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#define _PAGE_DEVICE 0x001 /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
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#define _PAGE_CACHABLE 0x002 /* CB1: uncachable/cachable */
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#define _PAGE_PRESENT 0x004 /* software: page referenced */
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#define _PAGE_SIZE0 0x008 /* SZ0-bit : size of page */
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#define _PAGE_SIZE1 0x010 /* SZ1-bit : size of page */
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#define _PAGE_SHARED 0x020 /* software: reflects PTEH's SH */
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#define _PAGE_READ 0x040 /* PR0-bit : read access allowed */
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#define _PAGE_EXECUTE 0x080 /* PR1-bit : execute access allowed */
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#define _PAGE_WRITE 0x100 /* PR2-bit : write access allowed */
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#define _PAGE_USER 0x200 /* PR3-bit : user space access allowed */
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#define _PAGE_DIRTY 0x400 /* software: page accessed in write */
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#define _PAGE_ACCESSED 0x800 /* software: page referenced */
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/* Wrapper for extended mode pgprot twiddling */
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#define _PAGE_EXT(x) ((unsigned long long)(x) << 32)
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/*
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* We can use the sign-extended bits in the PTEL to get 32 bits of
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* software flags. This works for now because no implementations uses
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* anything above the PPN field.
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*/
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#define _PAGE_WIRED _PAGE_EXT(0x001) /* software: wire the tlb entry */
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#define _PAGE_SPECIAL _PAGE_EXT(0x002)
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#define _PAGE_CLEAR_FLAGS (_PAGE_PRESENT | _PAGE_SHARED | \
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_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_WIRED)
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/* Mask which drops software flags */
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#define _PAGE_FLAGS_HARDWARE_MASK (NEFF_MASK & ~(_PAGE_CLEAR_FLAGS))
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/*
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* HugeTLB support
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*/
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#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
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#define _PAGE_SZHUGE (_PAGE_SIZE0)
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
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#define _PAGE_SZHUGE (_PAGE_SIZE1)
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#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
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#define _PAGE_SZHUGE (_PAGE_SIZE0 | _PAGE_SIZE1)
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#endif
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/*
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* Stub out _PAGE_SZHUGE if we don't have a good definition for it,
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* to make pte_mkhuge() happy.
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*/
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#ifndef _PAGE_SZHUGE
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# define _PAGE_SZHUGE (0)
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#endif
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/*
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* Default flags for a Kernel page.
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* This is fundametally also SHARED because the main use of this define
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* (other than for PGD/PMD entries) is for the VMALLOC pool which is
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* contextless.
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*
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* _PAGE_EXECUTE is required for modules
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*
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*/
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#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
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_PAGE_EXECUTE | \
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_PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \
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_PAGE_SHARED)
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/* Default flags for a User page */
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#define _PAGE_TABLE (_KERNPG_TABLE | _PAGE_USER)
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#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \
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_PAGE_SPECIAL)
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/*
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* We have full permissions (Read/Write/Execute/Shared).
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*/
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#define _PAGE_COMMON (_PAGE_PRESENT | _PAGE_USER | \
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_PAGE_CACHABLE | _PAGE_ACCESSED)
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#define PAGE_NONE __pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
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#define PAGE_SHARED __pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_WRITE | \
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_PAGE_SHARED)
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#define PAGE_EXECREAD __pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_EXECUTE)
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/*
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* We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
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* protection mode for the stack.
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*/
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#define PAGE_COPY PAGE_EXECREAD
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#define PAGE_READONLY __pgprot(_PAGE_COMMON | _PAGE_READ)
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#define PAGE_WRITEONLY __pgprot(_PAGE_COMMON | _PAGE_WRITE)
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#define PAGE_RWX __pgprot(_PAGE_COMMON | _PAGE_READ | \
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_PAGE_WRITE | _PAGE_EXECUTE)
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#define PAGE_KERNEL __pgprot(_KERNPG_TABLE)
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#define PAGE_KERNEL_NOCACHE \
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__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
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_PAGE_EXECUTE | _PAGE_ACCESSED | \
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_PAGE_DIRTY | _PAGE_SHARED)
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/* Make it a device mapping for maximum safety (e.g. for mapping device
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registers into user-space via /dev/map). */
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#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE)
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#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
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/*
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* PTE level access routines.
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*
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* Note1:
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* It's the tree walk leaf. This is physical address to be stored.
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*
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* Note 2:
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* Regarding the choice of _PTE_EMPTY:
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We must choose a bit pattern that cannot be valid, whether or not the page
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is present. bit[2]==1 => present, bit[2]==0 => swapped out. If swapped
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out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
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left for us to select. If we force bit[7]==0 when swapped out, we could use
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the combination bit[7,2]=2'b10 to indicate an empty PTE. Alternatively, if
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we force bit[7]==1 when swapped out, we can use all zeroes to indicate
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empty. This is convenient, because the page tables get cleared to zero
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when they are allocated.
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*/
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#define _PTE_EMPTY 0x0
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#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
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#define pte_clear(mm,addr,xp) (set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
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#define pte_none(x) (pte_val(x) == _PTE_EMPTY)
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/*
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* Some definitions to translate between mem_map, PTEs, and page
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* addresses:
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*/
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/*
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* Given a PTE, return the index of the mem_map[] entry corresponding
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* to the page frame the PTE. Get the absolute physical address, make
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* a relative physical address and translate it to an index.
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*/
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#define pte_pagenr(x) (((unsigned long) (pte_val(x)) - \
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__MEMORY_START) >> PAGE_SHIFT)
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/*
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* Given a PTE, return the "struct page *".
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*/
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#define pte_page(x) (mem_map + pte_pagenr(x))
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/*
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* Return number of (down rounded) MB corresponding to x pages.
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*/
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#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
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/*
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* The following have defined behavior only work if pte_present() is true.
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*/
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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_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
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static inline int pte_special(pte_t pte){ return pte_val(pte) & _PAGE_SPECIAL; }
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static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); 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_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); 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_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
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static inline pte_t pte_mkspecial(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SPECIAL)); return pte; }
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/*
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* Conversion functions: convert a page and protection to a page entry.
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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) \
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({ \
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pte_t __pte; \
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\
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set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) | \
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__MEMORY_START | pgprot_val((pgprot)))); \
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__pte; \
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})
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/*
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* This takes a (absolute) physical page address that is used
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* by the remapping functions
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*/
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#define mk_pte_phys(physpage, pgprot) \
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({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; })
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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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/* Encode and decode a swap entry */
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#define __swp_type(x) (((x).val & 3) + (((x).val >> 1) & 0x3c))
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#define __swp_offset(x) ((x).val >> 8)
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#define __swp_entry(type, offset) ((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
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#endif /* !__ASSEMBLY__ */
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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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|
#endif /* __ASM_SH_PGTABLE_64_H */
|