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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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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 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
11 | jermar | 29 | #ifndef __ia32_PAGE_H__ |
30 | #define __ia32_PAGE_H__ |
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1 | jermar | 31 | |
765 | jermar | 32 | #define PAGE_WIDTH FRAME_WIDTH |
1 | jermar | 33 | #define PAGE_SIZE FRAME_SIZE |
34 | |||
300 | palkovsky | 35 | #ifndef __ASM__ |
957 | decky | 36 | # define KA2PA(x) (((__address) (x)) - 0x80000000) |
37 | # define PA2KA(x) (((__address) (x)) + 0x80000000) |
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300 | palkovsky | 38 | #else |
957 | decky | 39 | # define KA2PA(x) ((x) - 0x80000000) |
40 | # define PA2KA(x) ((x) + 0x80000000) |
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300 | palkovsky | 41 | #endif |
1 | jermar | 42 | |
119 | jermar | 43 | /* |
44 | * Implementation of generic 4-level page table interface. |
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45 | * IA-32 has 2-level page tables, so PTL1 and PTL2 are left out. |
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46 | */ |
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832 | jermar | 47 | #define PTL0_ENTRIES_ARCH 1024 |
48 | #define PTL1_ENTRIES_ARCH 0 |
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49 | #define PTL2_ENTRIES_ARCH 0 |
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50 | #define PTL3_ENTRIES_ARCH 1024 |
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51 | |||
119 | jermar | 52 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr)>>22)&0x3ff) |
53 | #define PTL1_INDEX_ARCH(vaddr) 0 |
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54 | #define PTL2_INDEX_ARCH(vaddr) 0 |
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55 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr)>>12)&0x3ff) |
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56 | |||
57 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)((((pte_t *)(ptl0))[(i)].frame_address)<<12)) |
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58 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
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59 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
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60 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((__address)((((pte_t *)(ptl3))[(i)].frame_address)<<12)) |
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61 | |||
120 | jermar | 62 | #define SET_PTL0_ADDRESS_ARCH(ptl0) (write_cr3((__address) (ptl0))) |
63 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_t *)(ptl0))[(i)].frame_address = (a)>>12) |
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64 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
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65 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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66 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_t *)(ptl3))[(i)].frame_address = (a)>>12) |
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119 | jermar | 67 | |
120 | jermar | 68 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_flags((pte_t *)(ptl0), (index_t)(i)) |
69 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
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70 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
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71 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_flags((pte_t *)(ptl3), (index_t)(i)) |
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72 | |||
73 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_flags((pte_t *)(ptl0), (index_t)(i), (x)) |
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74 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
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75 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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76 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_flags((pte_t *)(ptl3), (index_t)(i), (x)) |
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77 | |||
832 | jermar | 78 | #define PTE_VALID_ARCH(p) (*((__u32 *) (p)) != 0) |
79 | |||
300 | palkovsky | 80 | #ifndef __ASM__ |
81 | |||
82 | #include <mm/page.h> |
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83 | #include <arch/types.h> |
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84 | #include <arch/mm/frame.h> |
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85 | #include <typedefs.h> |
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86 | |||
831 | jermar | 87 | /** Page Table Entry. */ |
1 | jermar | 88 | struct page_specifier { |
89 | unsigned present : 1; |
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90 | unsigned writeable : 1; |
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91 | unsigned uaccessible : 1; |
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92 | unsigned page_write_through : 1; |
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93 | unsigned page_cache_disable : 1; |
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94 | unsigned accessed : 1; |
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95 | unsigned dirty : 1; |
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825 | jermar | 96 | unsigned pat : 1; |
97 | unsigned global : 1; |
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831 | jermar | 98 | unsigned soft_valid : 1; /**< Valid content even if the present bit is not set. */ |
99 | unsigned avl : 2; |
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1 | jermar | 100 | unsigned frame_address : 20; |
101 | } __attribute__ ((packed)); |
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102 | |||
120 | jermar | 103 | static inline int get_pt_flags(pte_t *pt, index_t i) |
104 | { |
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105 | pte_t *p = &pt[i]; |
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106 | |||
107 | return ( |
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108 | (!p->page_cache_disable)<<PAGE_CACHEABLE_SHIFT | |
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109 | (!p->present)<<PAGE_PRESENT_SHIFT | |
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110 | p->uaccessible<<PAGE_USER_SHIFT | |
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111 | 1<<PAGE_READ_SHIFT | |
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112 | p->writeable<<PAGE_WRITE_SHIFT | |
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825 | jermar | 113 | 1<<PAGE_EXEC_SHIFT | |
114 | p->global<<PAGE_GLOBAL_SHIFT |
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120 | jermar | 115 | ); |
116 | } |
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117 | |||
118 | static inline void set_pt_flags(pte_t *pt, index_t i, int flags) |
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119 | { |
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120 | pte_t *p = &pt[i]; |
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121 | |||
122 | p->page_cache_disable = !(flags & PAGE_CACHEABLE); |
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123 | p->present = !(flags & PAGE_NOT_PRESENT); |
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135 | jermar | 124 | p->uaccessible = (flags & PAGE_USER) != 0; |
125 | p->writeable = (flags & PAGE_WRITE) != 0; |
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825 | jermar | 126 | p->global = (flags & PAGE_GLOBAL) != 0; |
831 | jermar | 127 | |
128 | /* |
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129 | * Ensure that there is at least one bit set even if the present bit is cleared. |
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130 | */ |
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131 | p->soft_valid = true; |
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120 | jermar | 132 | } |
133 | |||
1 | jermar | 134 | extern void page_arch_init(void); |
135 | |||
300 | palkovsky | 136 | #endif /* __ASM__ */ |
137 | |||
1 | jermar | 138 | #endif |