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98 | cejka | 1 | /* |
2 | * Copyright (C) 2005 Josef Cejka |
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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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95 | cejka | 28 | |
29 | |||
30 | #include <arch/boot/memmap.h> |
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31 | |||
32 | .global memmap_arch_init |
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33 | |||
34 | .code16 |
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35 | .section K_TEXT_START |
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36 | |||
98 | cejka | 37 | |
38 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
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39 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
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40 | E820_SMAP = 0x534d4150 |
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41 | |||
42 | .global memmap_arch_init |
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43 | |||
44 | .code16 |
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45 | .section K_TEXT_START |
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46 | |||
95 | cejka | 47 | memmap_arch_init: |
98 | cejka | 48 | |
49 | e820begin: |
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99 | jermar | 50 | xorl %ebx,%ebx # during first call, ebx must be 0 |
98 | cejka | 51 | |
52 | movw $e820table,%di |
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53 | movb $E820_MAX_RECORDS,(e820counter) |
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54 | e820loop: |
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55 | movl $E820_SMAP,%edx # constrol sequence "SMAP" |
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56 | pushw %ds |
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57 | popw %es # e820 buffer address |
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58 | |||
59 | movl $0xe820,%eax # service |
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60 | movl $E820_RECORD_SIZE,%ecx |
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61 | int $0x15 |
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62 | jc e820end |
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63 | |||
64 | |||
99 | jermar | 65 | cmpl $E820_SMAP,%eax # verifying BIOS |
98 | cejka | 66 | jne e820end |
67 | |||
68 | movw %di,%ax # next record |
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69 | addw $E820_RECORD_SIZE,%ax |
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70 | movw %ax,%di |
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71 | |||
72 | decb (e820counter) |
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73 | jnz e820loop |
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74 | |||
75 | e820end: |
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76 | |||
77 | movb (e820counter),%al |
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78 | negb %al |
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79 | addb $32,%al |
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80 | movb %al,(e820counter) # store # of valid entries in e820counter |
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81 | |||
82 | ret |
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83 | |||
84 | |||
85 | e820counter: |
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86 | .byte 0 |
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87 | |||
88 | e820table: |
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99 | jermar | 89 | .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |