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| Rev | Author | Line No. | Line |
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| 2128 | jermar | 1 | /* |
| 2465 | jermar | 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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| 2465 | jermar | 33 | * @brief Paging related functions. |
| 2128 | jermar | 34 | */ |
| 35 | |||
| 36 | #include <arch/mm/page.h> |
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| 37 | #include <genarch/mm/page_pt.h> |
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| 38 | #include <mm/page.h> |
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| 2465 | jermar | 39 | #include <align.h> |
| 40 | #include <config.h> |
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| 41 | #include <arch/exception.h> |
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| 42 | #include <typedefs.h> |
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| 43 | #include <arch/types.h> |
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| 44 | #include <interrupt.h> |
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| 45 | #include <arch/mm/frame.h> |
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| 2128 | jermar | 46 | |
| 2465 | jermar | 47 | /** Initializes page tables. |
| 48 | * |
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| 49 | * 1:1 virtual-physical mapping is created in kernel address space. Mapping |
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| 50 | * for table with exception vectors is also created. |
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| 51 | */ |
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| 2128 | jermar | 52 | void page_arch_init(void) |
| 53 | { |
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| 2465 | jermar | 54 | uintptr_t cur; |
| 55 | int flags; |
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| 56 | |||
| 2128 | jermar | 57 | page_mapping_operations = &pt_mapping_operations; |
| 2465 | jermar | 58 | |
| 59 | flags = PAGE_CACHEABLE; |
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| 60 | |||
| 61 | /* PA2KA(identity) mapping for all frames until last_frame */ |
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| 62 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
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| 63 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
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| 64 | } |
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| 65 | |||
| 66 | /* create mapping for exception table at high offset */ |
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| 67 | #ifdef HIGH_EXCEPTION_VECTORS |
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| 68 | void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA); |
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| 69 | page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags); |
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| 70 | #else |
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| 71 | #error "Only high exception vector supported now" |
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| 72 | #endif |
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| 73 | |||
| 74 | as_switch(NULL, AS_KERNEL); |
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| 75 | |||
| 76 | boot_page_table_free(); |
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| 2128 | jermar | 77 | } |
| 78 | |||
| 2465 | jermar | 79 | /** Maps device into the kernel space. |
| 80 | * |
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| 81 | * Maps physical address of device into kernel virtual address space (so it can |
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| 82 | * be accessed only by kernel through virtual address). |
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| 83 | * |
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| 84 | * @param physaddr Physical address where device is connected. |
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| 85 | * @param size Length of area where device is present. |
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| 86 | * |
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| 87 | * @return Virtual address where device will be accessible. |
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| 88 | */ |
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| 2128 | jermar | 89 | uintptr_t hw_map(uintptr_t physaddr, size_t size) |
| 90 | { |
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| 2465 | jermar | 91 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > |
| 92 | KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) { |
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| 93 | panic("Unable to map physical memory %p (%d bytes)", |
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| 94 | physaddr, size) |
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| 95 | } |
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| 96 | |||
| 97 | uintptr_t virtaddr = PA2KA(last_frame); |
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| 98 | pfn_t i; |
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| 99 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) { |
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| 100 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), |
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| 101 | physaddr + PFN2ADDR(i), |
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| 102 | PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL); |
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| 103 | } |
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| 104 | |||
| 105 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
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| 106 | return virtaddr; |
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| 2128 | jermar | 107 | } |
| 108 | |||
| 109 | /** @} |
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| 110 | */ |