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178 | palkovsky | 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/memmapasm.h> |
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31 | |||
32 | E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE |
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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 | .global e820counter |
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38 | .global e820table |
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39 | .global e801memorysize |
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40 | |||
41 | .code16 |
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42 | .section K_TEXT_START_2 |
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43 | |||
44 | memmap_arch_init: |
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45 | |||
46 | e820begin: |
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47 | xorl %ebx,%ebx # during first call, ebx must be 0 |
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48 | movw %bx,%ds |
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49 | movw %bx,%es |
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50 | movw $e820table,%di |
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51 | movb $E820_MAX_RECORDS,e820counter |
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52 | e820loop: |
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53 | movl $E820_SMAP,%edx # control sequence "SMAP" |
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54 | |||
55 | movl $0x0000e820,%eax # service |
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56 | movl $E820_RECORD_SIZE,%ecx |
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57 | int $0x15 |
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58 | jc e820err |
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59 | |||
60 | cmpl $E820_SMAP,%eax # verifying BIOS |
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61 | jne e820err |
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62 | |||
63 | cmpl $E820_RECORD_SIZE,%ecx |
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64 | jne e820err # bad record size - bug in bios |
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65 | |||
66 | movw %di,%ax # next record |
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67 | addw $E820_RECORD_SIZE,%ax |
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68 | movw %ax,%di |
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69 | |||
70 | decb e820counter # buffer is full |
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71 | jz e820end |
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72 | |||
73 | cmpl $0,%ebx |
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74 | jne e820loop |
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75 | |||
76 | e820end: |
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77 | movb $E820_MAX_RECORDS,%al |
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78 | subb e820counter,%al |
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79 | movb %al,e820counter # store # of valid entries in e820counter |
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80 | |||
81 | jmp e801begin |
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82 | |||
83 | e820err: |
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84 | movb $0,e820counter |
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85 | |||
86 | # method e801 - get size of memory |
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87 | |||
88 | e801begin: |
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89 | xorw %dx,%dx |
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90 | xorw %cx,%cx |
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91 | xorw %bx,%bx |
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92 | movw $0xe801,%ax |
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93 | stc |
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94 | int $0x15 |
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95 | |||
96 | jc e801end |
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97 | |||
98 | # fix problem with some BIOSes which use ax:bx rather than cx:dx |
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99 | testw %cx,%cx |
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100 | jnz e801cxdx |
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101 | testw %dx,%dx |
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102 | jnz e801cxdx |
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103 | |||
104 | movw %ax,%cx |
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105 | movw %bx,%dx |
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106 | |||
107 | e801cxdx: |
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108 | andl $0xffff,%edx |
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109 | shll $6,%edx |
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110 | andl $0xffff,%ecx |
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111 | addl %ecx,%edx |
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112 | addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method |
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113 | movl %edx,e801memorysize |
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114 | e801end: |
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115 | ret |
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116 | |||
117 | #memory size in 1 kb chunks |
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118 | e801memorysize: |
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119 | .long 0 |
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120 | |||
121 | e820counter: |
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219 | palkovsky | 122 | .byte 0x0 |
178 | palkovsky | 123 | |
124 | e820table: |
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219 | palkovsky | 125 | .space (32*E820_RECORD_SIZE),0x0 # space for 32 records, each E820_RECORD_SIZE bytes long |