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 */ |