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Rev | Author | Line No. | Line |
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680 | decky | 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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28 | |||
29 | |||
30 | #include <arch/boot/memmap.h> |
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31 | |||
32 | E820_SMAP = 0x534d4150 |
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33 | |||
34 | .global memmap_arch_init |
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35 | .global e801memorysize |
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36 | |||
37 | .code16 |
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38 | .section K_TEXT_START_2, "ax" |
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39 | |||
40 | memmap_arch_init: |
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41 | e820begin: |
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42 | xorl %ebx,%ebx # during first call, ebx must be 0 |
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43 | movw $e820table_boot,%di |
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44 | movb $MEMMAP_E820_MAX_RECORDS,e820counter_boot |
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45 | e820loop: |
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46 | movl $E820_SMAP,%edx # control sequence "SMAP" |
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47 | |||
48 | movl $0x0000e820,%eax # service |
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49 | movl $MEMMAP_E820_RECORD_SIZE,%ecx |
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50 | int $0x15 |
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51 | jc e820err |
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52 | |||
53 | cmpl $E820_SMAP,%eax # verifying BIOS |
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54 | jne e820err |
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55 | |||
56 | cmpl $MEMMAP_E820_RECORD_SIZE,%ecx |
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57 | jne e820err # bad record size - bug in bios |
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58 | |||
59 | movw %di,%ax # next record |
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60 | addw $MEMMAP_E820_RECORD_SIZE,%ax |
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61 | movw %ax,%di |
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62 | |||
63 | decb e820counter_boot # buffer is full |
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64 | jz e820end |
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65 | |||
66 | testl %ebx,%ebx |
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67 | jnz e820loop |
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68 | |||
69 | e820end: |
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70 | movb $MEMMAP_E820_MAX_RECORDS,%al |
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71 | subb e820counter_boot,%al |
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72 | movb %al,e820counter_boot # store # of valid entries in e820counter |
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73 | |||
74 | jmp e801begin |
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75 | |||
76 | e820err: |
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77 | movb $0,e820counter_boot |
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78 | |||
79 | # method e801 - get size of memory |
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80 | |||
81 | e801begin: |
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82 | xorw %dx,%dx |
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83 | xorw %cx,%cx |
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84 | xorw %bx,%bx |
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85 | movw $0xe801,%ax |
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86 | stc |
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87 | int $0x15 |
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88 | |||
89 | jc e801end |
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90 | |||
91 | # fix problem with some BIOSes which use ax:bx rather than cx:dx |
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92 | testw %cx,%cx |
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93 | jnz e801cxdx |
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94 | testw %dx,%dx |
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95 | jnz e801cxdx |
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96 | |||
97 | movw %ax,%cx |
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98 | movw %bx,%dx |
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99 | |||
100 | e801cxdx: |
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101 | andl $0xffff,%edx |
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102 | shll $6,%edx |
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103 | andl $0xffff,%ecx |
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104 | addl %ecx,%edx |
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105 | addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method |
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106 | movl %edx,e801memorysize |
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107 | e801end: |
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108 | ret |
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109 | |||
110 | |||
111 | .section K_DATA_START, "aw", @progbits |
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112 | |||
113 | #memory size in 1 kb chunks |
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114 | e801memorysize: |
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115 | .long 0 |