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scoutos / prex-0.9.0 / bsp / hal / x86 / include / mmu.h @ 03e9c04a

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/*-
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 * Copyright (c) 2008, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#ifndef _X86_MMU_H
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#define _X86_MMU_H
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#include <sys/types.h>
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typedef uint32_t        *pgd_t;                /* page directory */
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typedef uint32_t        *pte_t;                /* page table entry */
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/*
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 * Page directory entry
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 */
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#define PDE_PRESENT        0x00000001
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#define PDE_WRITE        0x00000002
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#define PDE_USER        0x00000004
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#define PDE_WTHRU        0x00000008
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#define PDE_NCACHE        0x00000010
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#define PDE_ACCESS        0x00000020
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#define PDE_SIZE        0x00000080
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#define PDE_AVAIL        0x00000e00
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#define PDE_ADDRESS        0xfffff000
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/*
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 * Page table entry
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 */
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#define PTE_PRESENT        0x00000001
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#define PTE_WRITE        0x00000002
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#define PTE_USER        0x00000004
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#define PTE_WTHRU        0x00000008
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#define PTE_NCACHE        0x00000010
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#define PTE_ACCESS        0x00000020
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#define PTE_DIRTY        0x00000040
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#define PTE_AVAIL        0x00000e00
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#define PTE_ADDRESS        0xfffff000
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/*
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 *  Virtual and physical address translation
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 */
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#define PAGE_DIR(virt)      (int)((((vaddr_t)(virt)) >> 22) & 0x3ff)
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#define PAGE_TABLE(virt)    (int)((((vaddr_t)(virt)) >> 12) & 0x3ff)
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#define pte_present(pgd, virt)  (pgd[PAGE_DIR(virt)] & PDE_PRESENT)
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#define page_present(pte, virt) (pte[PAGE_TABLE(virt)] & PTE_PRESENT)
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#define vtopte(pgd, virt) \
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            (pte_t)ptokv(((uint32_t *)pgd)[PAGE_DIR(virt)] & PDE_ADDRESS)
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#define ptetopg(pte, virt) \
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            ((pte)[PAGE_TABLE(virt)] & PTE_ADDRESS)
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#endif /* !_X86_MMU_H */