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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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2410 | stepan | 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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2182 | jancik | 39 | #include <align.h> |
40 | #include <config.h> |
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2258 | jancik | 41 | #include <arch/exception.h> |
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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2352 | kebrt | 45 | #include <arch/mm/frame.h> |
2258 | jancik | 46 | |
2128 | jermar | 47 | |
2415 | kebrt | 48 | /** Initializes page tables. |
49 | * |
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50 | * 1:1 virtual-physical mapping is created in kernel address space. Mapping |
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51 | * for table with exception vectors is also created. |
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2258 | jancik | 52 | */ |
2128 | jermar | 53 | void page_arch_init(void) |
54 | { |
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2238 | kebrt | 55 | uintptr_t cur; |
2182 | jancik | 56 | int flags; |
57 | |||
2128 | jermar | 58 | page_mapping_operations = &pt_mapping_operations; |
2182 | jancik | 59 | |
60 | flags = PAGE_CACHEABLE; |
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2238 | kebrt | 61 | |
2290 | kebrt | 62 | // PA2KA(identity) mapping for all frames until last_frame |
2243 | kebrt | 63 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
64 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
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65 | } |
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2270 | jancik | 66 | |
2290 | kebrt | 67 | // create mapping for exception table at high offset |
2270 | jancik | 68 | #ifdef HIGH_EXCEPTION_VECTORS |
2415 | kebrt | 69 | void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA); |
2290 | kebrt | 70 | page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags); |
2361 | jancik | 71 | #else |
2415 | kebrt | 72 | #error "Only high exception vector supported now" |
2270 | jancik | 73 | #endif |
2243 | kebrt | 74 | |
2263 | kebrt | 75 | as_switch(NULL, AS_KERNEL); |
2352 | kebrt | 76 | |
77 | boot_page_table_free(); |
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2128 | jermar | 78 | } |
79 | |||
2415 | kebrt | 80 | /** Maps device into the kernel space. |
2258 | jancik | 81 | * |
2415 | kebrt | 82 | * Maps physical address of device into kernel virtual address space (so it can |
83 | * be accessed only by kernel through virtual address). |
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2258 | jancik | 84 | * |
2415 | kebrt | 85 | * @param physaddr Physical address where device is connected. |
86 | * @param size Length of area where device is present. |
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2411 | stepan | 87 | * |
2415 | kebrt | 88 | * @return Virtual address where device will be accessible. |
2258 | jancik | 89 | */ |
2128 | jermar | 90 | uintptr_t hw_map(uintptr_t physaddr, size_t size) |
91 | { |
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2290 | kebrt | 92 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) { |
2258 | jancik | 93 | panic("Unable to map physical memory %p (%d bytes)", physaddr, size) |
2290 | kebrt | 94 | } |
2258 | jancik | 95 | |
96 | uintptr_t virtaddr = PA2KA(last_frame); |
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97 | pfn_t i; |
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2290 | kebrt | 98 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) { |
99 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), |
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100 | PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL); |
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101 | } |
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2258 | jancik | 102 | |
103 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
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104 | return virtaddr; |
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2128 | jermar | 105 | } |
106 | |||
2258 | jancik | 107 | |
2128 | jermar | 108 | /** @} |
109 | */ |
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2182 | jancik | 110 |