scoutos / prex-0.9.0 / bsp / hal / x86 / include / mmu.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _X86_MMU_H
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31 | #define _X86_MMU_H
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32 | |||
33 | #include <sys/types.h> |
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34 | |||
35 | typedef uint32_t *pgd_t; /* page directory */ |
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36 | typedef uint32_t *pte_t; /* page table entry */ |
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37 | |||
38 | /*
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39 | * Page directory entry
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40 | */
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41 | #define PDE_PRESENT 0x00000001 |
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42 | #define PDE_WRITE 0x00000002 |
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43 | #define PDE_USER 0x00000004 |
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44 | #define PDE_WTHRU 0x00000008 |
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45 | #define PDE_NCACHE 0x00000010 |
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46 | #define PDE_ACCESS 0x00000020 |
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47 | #define PDE_SIZE 0x00000080 |
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48 | #define PDE_AVAIL 0x00000e00 |
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49 | #define PDE_ADDRESS 0xfffff000 |
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50 | |||
51 | /*
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52 | * Page table entry
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53 | */
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54 | #define PTE_PRESENT 0x00000001 |
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55 | #define PTE_WRITE 0x00000002 |
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56 | #define PTE_USER 0x00000004 |
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57 | #define PTE_WTHRU 0x00000008 |
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58 | #define PTE_NCACHE 0x00000010 |
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59 | #define PTE_ACCESS 0x00000020 |
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60 | #define PTE_DIRTY 0x00000040 |
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61 | #define PTE_AVAIL 0x00000e00 |
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62 | #define PTE_ADDRESS 0xfffff000 |
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63 | |||
64 | /*
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65 | * Virtual and physical address translation
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66 | */
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67 | #define PAGE_DIR(virt) (int)((((vaddr_t)(virt)) >> 22) & 0x3ff) |
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68 | #define PAGE_TABLE(virt) (int)((((vaddr_t)(virt)) >> 12) & 0x3ff) |
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69 | |||
70 | #define pte_present(pgd, virt) (pgd[PAGE_DIR(virt)] & PDE_PRESENT)
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71 | |||
72 | #define page_present(pte, virt) (pte[PAGE_TABLE(virt)] & PTE_PRESENT)
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73 | |||
74 | #define vtopte(pgd, virt) \
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75 | (pte_t)ptokv(((uint32_t *)pgd)[PAGE_DIR(virt)] & PDE_ADDRESS) |
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76 | |||
77 | #define ptetopg(pte, virt) \
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78 | ((pte)[PAGE_TABLE(virt)] & PTE_ADDRESS) |
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79 | |||
80 | #endif /* !_X86_MMU_H */ |