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| Rev | Author | Line No. | Line |
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| 2198 | jancik | 1 | /* |
| 2236 | kebrt | 2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
| 2198 | jancik | 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 | |||
| 2236 | kebrt | 29 | /** @addtogroup arm32boot |
| 2198 | jancik | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 2236 | kebrt | 34 | |
| 2198 | jancik | 35 | #include "mm.h" |
| 36 | |||
| 2236 | kebrt | 37 | /** Initializes section page table entry. |
| 38 | * |
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| 39 | * Will be readable/writable by kernel with no access from user mode. |
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| 40 | * Will belong to domain 0. No cache or buffering is enabled. |
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| 41 | * |
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| 42 | * \param pte page table entry to set |
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| 43 | * \param frame first frame in the section (frame number) |
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| 44 | * \note If frame is not 1MB aligned, first lower 1MB aligned frame will be used. |
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| 2234 | jancik | 45 | */ |
| 2236 | kebrt | 46 | static void init_pte_level0_section(pte_level0_section* pte, unsigned frame){ |
| 2234 | jancik | 47 | pte->descriptor_type = PTE_DESCRIPTOR_SECTION; |
| 2198 | jancik | 48 | pte->bufferable = 0; // disable |
| 49 | pte->cacheable = 0; |
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| 2241 | kebrt | 50 | pte->impl_specific = 0; |
| 2198 | jancik | 51 | pte->domain = 0; |
| 52 | pte->should_be_zero_1 = 0; |
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| 2234 | jancik | 53 | pte->access_permission = PTE_AP_USER_NO_KERNEL_RW; |
| 2198 | jancik | 54 | pte->should_be_zero_2 = 0; |
| 55 | pte->section_base_addr = (frame << FRAME_WIDTH) >> 20; |
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| 56 | }; |
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| 57 | |||
| 58 | |||
| 59 | void mm_kernel_mapping(void) { |
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| 60 | int i; |
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| 2236 | kebrt | 61 | |
| 62 | const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION; |
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| 63 | // create 1:1 mapping (in lower 2GB) |
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| 64 | for(i = 0; i < first_kernel_section; i++) { |
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| 65 | init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION); |
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| 2234 | jancik | 66 | } |
| 2198 | jancik | 67 | |
| 2236 | kebrt | 68 | // create kernel mapping (in upper 2GB), physical addresses starting from 0 |
| 69 | for(i = first_kernel_section; i < PTL0_ENTRIES_ARCH; i++) { |
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| 70 | init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION); |
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| 2234 | jancik | 71 | } |
| 2198 | jancik | 72 | |
| 2236 | kebrt | 73 | set_ptl0_address(page_table); |
| 2198 | jancik | 74 | |
| 2236 | kebrt | 75 | // enable paging |
| 2198 | jancik | 76 | asm volatile ( |
| 2236 | kebrt | 77 | "ldr r0, =0x55555555 \n" |
| 78 | "mcr p15, 0, r0, c3, c0, 0 \n" // TODO: comment: set domain access rights to client <==> take rights from page tables |
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| 79 | "mrc p15, 0, r0, c1, c0, 0 \n" // get current settings of system |
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| 80 | "ldr r1, =0xFFFFFE8D \n" // mask to disable aligment checks; system & rom bit disabled |
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| 81 | "and r0, r0, r1 \n" |
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| 82 | "ldr r1, =0x00000001 \n" // mask to enable paging |
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| 83 | "orr r0, r0, r1 \n" |
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| 84 | "mcr p15, 0, r0, c1, c0, 0 \n" // store settings |
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| 85 | : |
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| 86 | : |
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| 87 | : "r0", "r1" |
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| 2234 | jancik | 88 | ); |
| 2198 | jancik | 89 | }; |
| 90 | |||
| 91 | /** @} |
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| 92 | */ |
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| 93 |