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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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5363 | yogev_ezra | 3 | ;; Copyright (C) KolibriOS team 2008-2015. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
4850 | mario79 | 8 | $Revision: 6843 $ |
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2288 | clevermous | 11 | ; Detect all BIOS hard drives. |
12 | ; diamond, 2008 |
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3520 | clevermous | 13 | ; Do not include USB mass storages. CleverMouse, 2013 |
6843 | dunkaist | 14 | ; Read the number of sectors, bytes per sector. dunkaist, 2017 |
2288 | clevermous | 15 | |
16 | xor cx, cx |
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17 | mov es, cx |
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18 | mov di, 0x9080 |
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19 | mov byte [es:di-1], cl |
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20 | cmp [preboot_biosdisk], 1 |
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21 | jnz bdde |
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22 | mov dl, 80h |
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23 | bdds: |
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24 | mov ah, 15h |
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25 | push cx dx di |
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26 | int 13h |
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27 | pop di dx cx |
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28 | jc bddc |
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29 | test ah, ah |
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30 | jz bddc |
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31 | inc cx |
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3520 | clevermous | 32 | ; We are going to call int 13h/func 48h, Extended get drive parameters. |
33 | ; The latest version of the EDD specification is 3.0. |
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34 | ; There are two slightly incompatible variants for version 3.0; |
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35 | ; original one from Phoenix in 1998, see e.g. |
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36 | ; http://www.t10.org/t13/technical/d98120r0.pdf, and T13 draft, |
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37 | ; http://www.t13.org/documents/UploadedDocuments/docs2004/d1572r3-EDD3.pdf |
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38 | ; T13 draft addresses more possible buses, so it gives additional 8 bytes |
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39 | ; for device path. |
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40 | ; Most BIOSes follow Phoenix, but T13 version is also known to be used |
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41 | ; (e.g. systems based on AMD Geode). |
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42 | ; Fortunately, there is an in/out length field, so |
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43 | ; it is easy to tell what variant was selected by the BIOS: |
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44 | ; Phoenix-3.0 has 42h bytes, T13-3.0 has 4Ah bytes. |
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45 | ; Note that 2.0 has 1Eh bytes, 1.1 has 1Ah bytes; both variants of 3.0 have |
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46 | ; the same structure for first 1Eh bytes, compatible with previous versions. |
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47 | ; Note also that difference between Phoenix-3.0 and T13-3.0 starts near the |
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48 | ; end of the structure, so the current code doesn't even need to distinguish. |
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49 | ; It needs, however, give at least 4Ah bytes as input and expect that BIOS |
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50 | ; could return 42h bytes as output while still giving all the information. |
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2288 | clevermous | 51 | mov ah, 48h |
52 | push ds |
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53 | push es |
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54 | pop ds |
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55 | mov si, 0xA000 |
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3520 | clevermous | 56 | mov word [si], 4Ah |
2288 | clevermous | 57 | mov ah, 48h |
58 | int 13h |
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59 | pop ds |
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60 | jc bddc2 |
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61 | cmp word [es:si], 1Eh |
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3520 | clevermous | 62 | jb .noide |
2288 | clevermous | 63 | cmp word [es:si+1Ah], 0xFFFF |
3520 | clevermous | 64 | jz .noide |
65 | inc byte [es:0x907F] |
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2288 | clevermous | 66 | mov al, dl |
67 | stosb |
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68 | push ds |
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6843 | dunkaist | 69 | push si |
2288 | clevermous | 70 | lds si, [es:si+1Ah] |
71 | mov al, [si+6] |
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72 | and al, 0xF |
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73 | stosb |
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74 | mov al, byte [si+4] |
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75 | shr al, 4 |
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76 | and ax, 1 |
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77 | cmp word [si], 1F0h |
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78 | jz @f |
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79 | inc ax |
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80 | inc ax |
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81 | cmp word [si], 170h |
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82 | jz @f |
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83 | or ax, -1 |
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84 | ; mov ax, -1 |
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85 | @@: |
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86 | stosw |
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6843 | dunkaist | 87 | pop si |
2288 | clevermous | 88 | pop ds |
6843 | dunkaist | 89 | jmp bddc3 |
3520 | clevermous | 90 | .noide: |
91 | cmp word [es:si], 42h |
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92 | jb .nousb |
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93 | cmp word [es:si+28h], 'US' |
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94 | jnz .nousb |
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95 | cmp byte [es:si+2Ah], 'B' |
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96 | jz bddc2 |
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97 | .nousb: |
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98 | inc byte [es:0x907F] |
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2288 | clevermous | 99 | mov al, dl |
100 | stosb |
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101 | xor ax, ax |
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102 | stosb |
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103 | dec ax |
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104 | stosw |
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105 | ; mov al, 0 |
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106 | ; stosb |
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107 | ; mov ax, -1 |
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108 | ; stosw |
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6843 | dunkaist | 109 | bddc3: |
110 | movzx eax, word[es:si+24] |
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111 | stosd |
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112 | mov eax, [es:si+16] |
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113 | stosd |
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114 | mov eax, [es:si+20] |
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115 | stosd |
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2288 | clevermous | 116 | bddc2: |
117 | cmp cl, [es:0x475] |
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118 | jae bdde |
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119 | bddc: |
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120 | inc dl |
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121 | jnz bdds |
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122 | bdde: |