1 | ; File name : Initialize.asm |
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2 | ; Project name : IDE BIOS |
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3 | ; Created date : 23.3.2010 |
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4 | ; Last update : 23.8.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Functions for initializing the BIOS. |
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7 | |
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8 | ; Section containing code |
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9 | SECTION .text |
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10 | |
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11 | ;-------------------------------------------------------------------- |
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12 | ; Initializes the BIOS. |
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13 | ; This function is called from main BIOS ROM search routine. |
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14 | ; |
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15 | ; Initialize_FromMainBiosRomSearch |
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16 | ; Parameters: |
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17 | ; Nothing |
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18 | ; Returns: |
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19 | ; Nothing |
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20 | ; Corrupts registers: |
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21 | ; Nothing |
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22 | ;-------------------------------------------------------------------- |
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23 | ALIGN JUMP_ALIGN |
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24 | Initialize_FromMainBiosRomSearch: |
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25 | pushf |
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26 | push es |
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27 | push ds |
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28 | ePUSHA |
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29 | |
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30 | call Initialize_ShouldSkip |
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31 | jc SHORT .ReturnFromRomInit |
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32 | |
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33 | ePUSH_T ax, .ReturnFromRomInit ; Push return address |
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34 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_LATE |
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35 | jnz SHORT Initialize_PrepareLateInitialization |
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36 | jmp SHORT Initialize_AndDetectDrives |
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37 | |
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38 | ALIGN JUMP_ALIGN |
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39 | .ReturnFromRomInit: |
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40 | ePOPA |
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41 | pop ds |
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42 | pop es |
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43 | popf |
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44 | retf |
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45 | |
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46 | |
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47 | ;-------------------------------------------------------------------- |
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48 | ; Checks if user wants to skip ROM initialization. |
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49 | ; |
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50 | ; Initialize_ShouldSkip |
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51 | ; Parameters: |
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52 | ; Nothing |
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53 | ; Returns: |
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54 | ; CF: Set if ROM initialization is to be skipped |
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55 | ; Cleared to continue ROM initialization |
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56 | ; Corrupts registers: |
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57 | ; AX, DS |
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58 | ;-------------------------------------------------------------------- |
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59 | ALIGN JUMP_ALIGN |
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60 | Initialize_ShouldSkip: |
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61 | sti ; Enable interrupts |
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62 | LOAD_BDA_SEGMENT_TO ds, ax |
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63 | mov al, [BDA.bKBFlgs1] ; Load shift flags |
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64 | eSHR_IM al, 3 ; Set CF if CTRL is held down |
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65 | ret |
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66 | |
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67 | |
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68 | ;-------------------------------------------------------------------- |
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69 | ; Installs INT 19h boot loader handler for late initialization. |
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70 | ; |
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71 | ; Initialize_PrepareLateInitialization |
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72 | ; Parameters: |
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73 | ; Nothing |
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74 | ; Returns: |
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75 | ; Nothing |
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76 | ; Corrupts registers: |
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77 | ; BX, SI, ES |
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78 | ;-------------------------------------------------------------------- |
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79 | ALIGN JUMP_ALIGN |
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80 | Initialize_PrepareLateInitialization: |
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81 | LOAD_BDA_SEGMENT_TO es, bx |
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82 | mov bl, INTV_BOOTSTRAP |
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83 | mov si, Int19h_LateInitialization |
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84 | jmp Interrupts_InstallHandlerToVectorInBXFromCSSI |
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85 | |
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86 | |
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87 | ;-------------------------------------------------------------------- |
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88 | ; Initializes the BIOS variables and detects IDE drives. |
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89 | ; |
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90 | ; Initialize_AndDetectDrives |
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91 | ; Parameters: |
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92 | ; Nothing |
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93 | ; Returns: |
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94 | ; Nothing |
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95 | ; Corrupts registers: |
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96 | ; All, including segments |
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97 | ;-------------------------------------------------------------------- |
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98 | ALIGN JUMP_ALIGN |
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99 | Initialize_AndDetectDrives: |
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100 | call DetectPrint_RomFoundAtSegment |
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101 | call RamVars_Initialize |
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102 | call RamVars_GetSegmentToDS |
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103 | LOAD_BDA_SEGMENT_TO es, ax |
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104 | call Interrupts_InitializeInterruptVectors |
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105 | call DetectDrives_FromAllIDEControllers |
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106 | call CompatibleDPT_CreateForDrives80hAnd81h |
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107 | ; Fall to .ResetDetectedDrives |
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108 | |
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109 | ;-------------------------------------------------------------------- |
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110 | ; Resets all hard disks. |
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111 | ; |
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112 | ; Initialize_ResetDetectedDrives |
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113 | ; Parameters: |
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114 | ; DS: RAMVARS segment |
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115 | ; Returns: |
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116 | ; Nothing |
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117 | ; Corrupts registers: |
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118 | ; AX, BX, CX, DX, DI |
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119 | ;-------------------------------------------------------------------- |
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120 | ;ALIGN JUMP_ALIGN |
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121 | .ResetDetectedDrives: |
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122 | jmp AH0h_ResetHardDisksHandledByOurBIOS |
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