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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 | |||
| 2254 | kebrt | 37 | |
| 2236 | kebrt | 38 | /** Initializes section page table entry. |
| 39 | * |
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| 40 | * Will be readable/writable by kernel with no access from user mode. |
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| 41 | * Will belong to domain 0. No cache or buffering is enabled. |
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| 42 | * |
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| 43 | * \param pte page table entry to set |
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| 44 | * \param frame first frame in the section (frame number) |
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| 45 | * \note If frame is not 1MB aligned, first lower 1MB aligned frame will be used. |
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| 2234 | jancik | 46 | */ |
| 2257 | jancik | 47 | static void init_pte_level0_section(pte_level0_section_t* pte, unsigned frame) |
| 2254 | kebrt | 48 | { |
| 2234 | jancik | 49 | pte->descriptor_type = PTE_DESCRIPTOR_SECTION; |
| 2254 | kebrt | 50 | pte->bufferable = 0; |
| 2198 | jancik | 51 | pte->cacheable = 0; |
| 2241 | kebrt | 52 | pte->impl_specific = 0; |
| 2198 | jancik | 53 | pte->domain = 0; |
| 54 | pte->should_be_zero_1 = 0; |
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| 2234 | jancik | 55 | pte->access_permission = PTE_AP_USER_NO_KERNEL_RW; |
| 2198 | jancik | 56 | pte->should_be_zero_2 = 0; |
| 57 | pte->section_base_addr = (frame << FRAME_WIDTH) >> 20; |
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| 2254 | kebrt | 58 | } |
| 2198 | jancik | 59 | |
| 60 | |||
| 2254 | kebrt | 61 | static void init_page_table(void) |
| 62 | { |
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| 2198 | jancik | 63 | int i; |
| 2236 | kebrt | 64 | |
| 65 | const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION; |
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| 2254 | kebrt | 66 | // create 1:1 mapping virtual-physical (in lower 2GB) |
| 2236 | kebrt | 67 | for(i = 0; i < first_kernel_section; i++) { |
| 68 | init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION); |
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| 2234 | jancik | 69 | } |
| 2198 | jancik | 70 | |
| 2236 | kebrt | 71 | // create kernel mapping (in upper 2GB), physical addresses starting from 0 |
| 72 | for(i = first_kernel_section; i < PTL0_ENTRIES_ARCH; i++) { |
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| 73 | init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION); |
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| 2234 | jancik | 74 | } |
| 2254 | kebrt | 75 | } |
| 76 | |||
| 77 | |||
| 78 | void mmu_start() { |
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| 79 | init_page_table(); |
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| 2236 | kebrt | 80 | set_ptl0_address(page_table); |
| 2254 | kebrt | 81 | enable_paging(); |
| 82 | } |
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| 2198 | jancik | 83 | |
| 84 | /** @} |
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| 85 | */ |
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| 86 |