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2128 | jermar | 1 | /* |
2238 | kebrt | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2128 | jermar | 3 | * All rights reserved. |
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 | |||
29 | /** @addtogroup arm32mm |
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30 | * @{ |
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31 | */ |
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32 | /** @file |
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33 | */ |
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34 | |||
35 | #ifndef KERN_arm32_PAGE_H_ |
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36 | #define KERN_arm32_PAGE_H_ |
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37 | |||
38 | #include <arch/mm/frame.h> |
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2182 | jancik | 39 | #include <mm/mm.h> |
40 | #include <arch/exception.h> |
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2128 | jermar | 41 | |
2182 | jancik | 42 | |
2128 | jermar | 43 | #define PAGE_WIDTH FRAME_WIDTH |
44 | #define PAGE_SIZE FRAME_SIZE |
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45 | |||
46 | #define PAGE_COLOR_BITS 0 /* dummy */ |
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47 | |||
48 | #ifndef __ASM__ |
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49 | # define KA2PA(x) (((uintptr_t) (x)) - 0x80000000) |
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50 | # define PA2KA(x) (((uintptr_t) (x)) + 0x80000000) |
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51 | #else |
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52 | # define KA2PA(x) ((x) - 0x80000000) |
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53 | # define PA2KA(x) ((x) + 0x80000000) |
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54 | #endif |
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55 | |||
56 | #ifdef KERNEL |
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57 | |||
2238 | kebrt | 58 | // "small" pages (4KB) used |
59 | #define PTL0_ENTRIES_ARCH (2<<12) // 4096 |
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60 | #define PTL1_ENTRIES_ARCH 0 |
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61 | #define PTL2_ENTRIES_ARCH 0 |
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62 | #define PTL3_ENTRIES_ARCH (2<<8) // 256 |
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2128 | jermar | 63 | |
2238 | kebrt | 64 | #define PTL0_INDEX_ARCH(vaddr) (((vaddr) >> 20) & 0xfff) |
65 | #define PTL1_INDEX_ARCH(vaddr) 0 |
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66 | #define PTL2_INDEX_ARCH(vaddr) 0 |
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67 | #define PTL3_INDEX_ARCH(vaddr) (((vaddr) >> 12) & 0x0ff) |
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2128 | jermar | 68 | |
2238 | kebrt | 69 | #define GET_PTL1_ADDRESS_ARCH(ptl0, i) ((pte_t *)( (((pte_level0_t*)(ptl0))[(i)]).coarse_table_addr << 10 )) |
70 | #define GET_PTL2_ADDRESS_ARCH(ptl1, i) (ptl1) |
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71 | #define GET_PTL3_ADDRESS_ARCH(ptl2, i) (ptl2) |
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72 | #define GET_FRAME_ADDRESS_ARCH(ptl3, i) ((uintptr_t)( (((pte_level1_t*)(ptl3))[(i)]).frame_base_addr << 12 )) |
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2128 | jermar | 73 | |
2238 | kebrt | 74 | #define SET_PTL0_ADDRESS_ARCH(ptl0) (set_ptl0_addr((pte_level0_t *)(ptl0))) |
75 | #define SET_PTL1_ADDRESS_ARCH(ptl0, i, a) (((pte_level0_t *)(ptl0))[(i)].coarse_table_addr = (a)>>10) |
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2147 | jancik | 76 | #define SET_PTL2_ADDRESS_ARCH(ptl1, i, a) |
77 | #define SET_PTL3_ADDRESS_ARCH(ptl2, i, a) |
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2182 | jancik | 78 | #define SET_FRAME_ADDRESS_ARCH(ptl3, i, a) (((pte_level1_t *)(ptl3))[(i)].frame_base_addr = (a)>>12) |
2128 | jermar | 79 | |
2238 | kebrt | 80 | #define GET_PTL1_FLAGS_ARCH(ptl0, i) get_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i)) |
81 | #define GET_PTL2_FLAGS_ARCH(ptl1, i) PAGE_PRESENT |
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82 | #define GET_PTL3_FLAGS_ARCH(ptl2, i) PAGE_PRESENT |
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83 | #define GET_FRAME_FLAGS_ARCH(ptl3, i) get_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i)) |
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2128 | jermar | 84 | |
2238 | kebrt | 85 | #define SET_PTL1_FLAGS_ARCH(ptl0, i, x) set_pt_level0_flags((pte_level0_t *)(ptl0), (index_t)(i), (x)) |
2147 | jancik | 86 | #define SET_PTL2_FLAGS_ARCH(ptl1, i, x) |
87 | #define SET_PTL3_FLAGS_ARCH(ptl2, i, x) |
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2238 | kebrt | 88 | #define SET_FRAME_FLAGS_ARCH(ptl3, i, x) set_pt_level1_flags((pte_level1_t *)(ptl3), (index_t)(i), (x)) |
2128 | jermar | 89 | |
2182 | jancik | 90 | #define PTE_VALID_ARCH(pte) (*((uint32_t *) (pte)) != 0) |
91 | #define PTE_PRESENT_ARCH(pte) ( ((pte_level0_t *)(pte))->descriptor_type ) |
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2238 | kebrt | 92 | // pte should point into ptl3 |
93 | #define PTE_GET_FRAME_ARCH(pte) ( ((pte_level1_t *)(pte))->frame_base_addr << FRAME_WIDTH) |
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94 | // pte should point into ptl3 |
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95 | #define PTE_WRITABLE_ARCH(pte) ( ((pte_level1_t *)(pte))->access_permission_0 == pte_ap_user_rw_kernel_rw ) |
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96 | #define PTE_EXECUTABLE_ARCH(pte) 1 |
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2128 | jermar | 97 | |
98 | #ifndef __ASM__ |
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99 | |||
2238 | kebrt | 100 | /** Sets the address of level 0 page table. |
101 | * \param pt pointer to the page table to set |
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2182 | jancik | 102 | */ |
2238 | kebrt | 103 | static inline void set_ptl0_addr( pte_level0_t* pt) |
104 | { |
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2199 | jancik | 105 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
2238 | kebrt | 106 | : |
107 | : "r"(pt) |
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2182 | jancik | 108 | ); |
109 | |||
110 | } |
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2128 | jermar | 111 | |
2147 | jancik | 112 | //TODO Comment: Page table structure as in other architectures |
113 | static inline int get_pt_level0_flags(pte_level0_t *pt, index_t i) |
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2128 | jermar | 114 | { |
2238 | kebrt | 115 | pte_level0_t *p = &pt[i]; |
2147 | jancik | 116 | |
117 | return ( |
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2149 | jancik | 118 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2147 | jancik | 119 | ( 1 << PAGE_READ_SHIFT ) | |
120 | ( 1 << PAGE_EXEC_SHIFT ) | |
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121 | ( 1 << PAGE_CACHEABLE ) |
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122 | ); |
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2238 | kebrt | 123 | } |
2147 | jancik | 124 | |
2149 | jancik | 125 | static inline int get_pt_level1_flags(pte_level1_t *pt, index_t i) |
2147 | jancik | 126 | { |
127 | pte_level1_t *p = &pt[i]; |
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2128 | jermar | 128 | |
2147 | jancik | 129 | return ( |
2149 | jancik | 130 | ( p->descriptor_type != pte_descriptor_not_preset ) << PAGE_PRESENT_SHIFT | |
2147 | jancik | 131 | ( (p->access_permission_0 == pte_ap_user_ro_kernel_rw) << PAGE_READ_SHIFT ) | |
132 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_READ_SHIFT ) | |
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133 | ( (p->access_permission_0 == pte_ap_user_rw_kernel_rw) << PAGE_WRITE_SHIFT ) | |
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2182 | jancik | 134 | ( (p->access_permission_0 != pte_ap_user_no_kernel_rw) << PAGE_USER_SHIFT ) | |
2147 | jancik | 135 | ( 1 << PAGE_EXEC_SHIFT ) | |
136 | ( p->bufferable << PAGE_CACHEABLE ) |
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137 | |||
138 | |||
139 | ); |
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140 | |||
141 | } |
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142 | |||
143 | static inline void set_pt_level0_flags(pte_level0_t *pt, index_t i, int flags) |
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2128 | jermar | 144 | { |
2147 | jancik | 145 | pte_level0_t *p = &pt[i]; |
146 | |||
147 | if ( flags & PAGE_NOT_PRESENT ) { |
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2238 | kebrt | 148 | p->descriptor_type = pte_descriptor_not_preset; |
149 | p->should_be_zero = 1; |
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150 | } else { |
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151 | p->descriptor_type = pte_descriptor_coarse_table; |
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152 | p->should_be_zero = 0; |
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2147 | jancik | 153 | } |
2128 | jermar | 154 | } |
155 | |||
2238 | kebrt | 156 | /* TODO: rewrite comment: We use same acess rights for whole page, so if page is set as not preset then |
2147 | jancik | 157 | * in acess_rigts_3 set value 1 |
158 | */ |
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159 | static inline void set_pt_level1_flags(pte_level1_t *pt, index_t i, int flags) |
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160 | { |
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161 | pte_level1_t *p = &pt[i]; |
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162 | |||
163 | if ( flags & PAGE_NOT_PRESENT ) { |
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2238 | kebrt | 164 | p->descriptor_type = pte_descriptor_not_preset; |
165 | p->access_permission_3 = 1; |
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166 | } else { |
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167 | p->descriptor_type = pte_descriptor_coarse_table; |
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168 | p->access_permission_3 = p->access_permission_0; |
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169 | } |
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2147 | jancik | 170 | |
2238 | kebrt | 171 | p->cacheable = p->bufferable = (flags & PAGE_CACHEABLE) != 0; |
172 | |||
173 | // default kernel rw, user none |
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174 | p->access_permission_0 = p->access_permission_1 = |
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175 | p->access_permission_2 = p->access_permission_3 = pte_ap_user_no_kernel_rw; |
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176 | |||
177 | if ( flags & PAGE_USER ) { |
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178 | if ( flags & PAGE_READ ) { |
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179 | p->access_permission_0 = p->access_permission_1 = |
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180 | p->access_permission_2 = p->access_permission_3 = |
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181 | pte_ap_user_ro_kernel_rw; |
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182 | } |
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183 | if ( flags & PAGE_WRITE ) { |
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184 | p->access_permission_0 = p->access_permission_1 = |
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185 | p->access_permission_2 = p->access_permission_3 = |
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186 | pte_ap_user_rw_kernel_rw; |
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187 | } |
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188 | } |
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2147 | jancik | 189 | } |
190 | |||
2128 | jermar | 191 | extern void page_arch_init(void); |
192 | |||
193 | #endif /* __ASM__ */ |
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194 | |||
195 | #endif /* KERNEL */ |
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196 | |||
197 | #endif |
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198 | |||
199 | /** @} |
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200 | */ |
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2147 | jancik | 201 |