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| 2198 | jancik | 1 | /* |
| 2 | * Copyright (c) 2003-2004 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 | |||
| 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 | |||
| 36 | #ifndef __MM_H__ |
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| 37 | #define __MM_H__ |
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| 38 | |||
| 39 | #include "types.h" |
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| 40 | |||
| 41 | |||
| 42 | #define FRAME_WIDTH 12 /* 4KB frames */ |
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| 43 | #define FRAME_SIZE (1 << FRAME_WIDTH) |
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| 44 | |||
| 45 | #define PAGE_WIDTH FRAME_WIDTH |
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| 46 | #define PAGE_SIZE FRAME_SIZE |
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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 | #define SET_PTL0_ADDRESS_ARCH(ptl0) ( set_ptl0_addr((pte_level0_section *)(ptl0)) ) |
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| 57 | |||
| 58 | |||
| 59 | /// User no acess, kernel read/write |
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| 60 | #define pte_ap_user_no_kernel_rw 1 |
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| 61 | |||
| 62 | /// Frames per 1MB section |
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| 63 | #define FRAMES_PER_SECTION ( ( 1 << 20 ) / FRAME_SIZE ) |
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| 64 | |||
| 65 | /// Converts Address to frame |
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| 66 | #define ADDR2PFN( addr ) ( ((uintptr_t)(addr))>>FRAME_WIDTH ) |
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| 67 | /** Value of descriptor_type in page table entry that signals |
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| 68 | * that this entry describe section |
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| 69 | */ |
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| 70 | #define pte_descriptor_section 2 |
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| 71 | |||
| 72 | /** Page Table Entry. */ |
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| 73 | typedef struct { |
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| 74 | /**PageTables are so different that we have different types |
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| 75 | * for level 0 and level1 page table entries |
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| 76 | */ |
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| 77 | unsigned dummy : 32; |
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| 78 | } pte_t; |
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| 79 | |||
| 80 | /** Page table level 0 entry - section format */ |
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| 81 | typedef struct { |
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| 82 | unsigned descriptor_type : 2; // should be 2 |
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| 83 | unsigned bufferable : 1; |
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| 84 | unsigned cacheable : 1; |
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| 85 | unsigned machine_depend : 1; // Alf: ???? v Architecture previev neni vyznam definovan |
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| 86 | unsigned domain : 4; |
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| 87 | unsigned should_be_zero_1 : 1; |
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| 88 | unsigned access_permission : 2; |
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| 89 | unsigned should_be_zero_2 : 8; |
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| 90 | unsigned section_base_addr : 12; |
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| 91 | } __attribute__ ((packed)) pte_level0_section; |
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| 92 | |||
| 93 | |||
| 94 | /** Set adress of paging level 0 table |
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| 95 | * \param pt pointer to page table to set |
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| 96 | */ |
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| 97 | static inline void set_ptl0_addr( pte_level0_section* pt) { |
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| 98 | asm volatile ( "mcr p15, 0, %0, c2, c0, 0 \n" |
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| 99 | : |
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| 100 | : "r"(pt) |
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| 101 | ); |
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| 102 | |||
| 103 | } |
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| 104 | |||
| 105 | /// Page table that holds 1:1 mapping for kernel starting |
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| 106 | extern pte_level0_section page_table[4096]; |
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| 107 | |||
| 108 | |||
| 109 | /** Set page table entry to point no frame, be read/write by kernel, |
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| 110 | * no access by user, become to domain 0, no cache or buffer |
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| 111 | * \param pte page table entry to set |
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| 112 | * \param frame frame number of first frame 1MB section |
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| 113 | * Note: If frame not aligned it's used first lower 1MB aligned frame |
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| 114 | */ |
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| 115 | void init_pte_level0_section_entry( pte_level0_section* pte, unsigned frame); |
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| 116 | |||
| 117 | /// Sets memory mapping for kernel |
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| 118 | void mm_kernel_mapping(void); |
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| 119 | |||
| 120 | #endif |
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| 121 | |||
| 122 | /** @} |
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| 123 | */ |
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| 124 |