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Rev | Author | Line No. | Line |
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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 | |||
98 | cejka | 32 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
33 | E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS |
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34 | E820_SMAP = 0x534d4150 |
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35 | |||
36 | .global memmap_arch_init |
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37 | |||
38 | .code16 |
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110 | jermar | 39 | .section K_TEXT_START_2 |
98 | cejka | 40 | |
95 | cejka | 41 | memmap_arch_init: |
98 | cejka | 42 | |
43 | e820begin: |
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99 | jermar | 44 | xorl %ebx,%ebx # during first call, ebx must be 0 |
98 | cejka | 45 | |
46 | movw $e820table,%di |
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47 | movb $E820_MAX_RECORDS,(e820counter) |
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48 | e820loop: |
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49 | movl $E820_SMAP,%edx # constrol sequence "SMAP" |
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50 | pushw %ds |
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51 | popw %es # e820 buffer address |
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52 | |||
53 | movl $0xe820,%eax # service |
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54 | movl $E820_RECORD_SIZE,%ecx |
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55 | int $0x15 |
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56 | jc e820end |
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57 | |||
58 | |||
99 | jermar | 59 | cmpl $E820_SMAP,%eax # verifying BIOS |
98 | cejka | 60 | jne e820end |
61 | |||
62 | movw %di,%ax # next record |
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63 | addw $E820_RECORD_SIZE,%ax |
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64 | movw %ax,%di |
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65 | |||
101 | cejka | 66 | decb (e820counter) # buffer is full |
67 | jz e820end |
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98 | cejka | 68 | |
101 | cejka | 69 | cmpl $0,%ebx |
70 | jne e820loop |
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71 | |||
98 | cejka | 72 | e820end: |
73 | |||
74 | movb (e820counter),%al |
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75 | negb %al |
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76 | addb $32,%al |
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77 | movb %al,(e820counter) # store # of valid entries in e820counter |
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78 | |||
79 | ret |
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80 | |||
81 | |||
82 | e820counter: |
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83 | .byte 0 |
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84 | |||
85 | e820table: |
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99 | jermar | 86 | .space (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long |