1 | ; File name : HIRQ.asm
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2 | ; Project name : IDE BIOS
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3 | ; Created date : 11.12.2009
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4 | ; Last update : 23.8.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : Interrupt handling related functions.
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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 | ; HIRQ_WaitForIRQ
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13 | ; Parameters:
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14 | ; DS: RAMVARS segment
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15 | ; Returns:
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16 | ; CF: Set if wait done by operating system
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17 | ; Cleared if BIOS must perform task flag polling
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18 | ; Corrupts registers:
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19 | ; AX
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20 | ;--------------------------------------------------------------------
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21 | ALIGN JUMP_ALIGN
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22 | HIRQ_WaitForIRQ:
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23 | test BYTE [bx+DPT.bDrvCtrl], FLG_IDE_CTRL_nIEN ; Clears CF
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24 | jz SHORT .NotifyOperatingSystemAboutWaitingForIRQ
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25 | ret ; Go to poll status register
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26 |
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27 | ;--------------------------------------------------------------------
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28 | ; .NotifyOperatingSystemAboutWaitingForIRQ
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29 | ; Parameters:
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30 | ; Nothing
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31 | ; Returns:
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32 | ; CF: Set if wait done by operating system
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33 | ; Cleared if BIOS must perform task flag polling
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34 | ; Corrupts registers:
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35 | ; AX
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36 | ;--------------------------------------------------------------------
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37 | ALIGN JUMP_ALIGN
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38 | .NotifyOperatingSystemAboutWaitingForIRQ:
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39 | push ds
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40 |
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41 | LOAD_BDA_SEGMENT_TO ds, ax ; Zero AX
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42 | cli ; Disable interrupts
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43 | cmp al, [ds:BDA.bHDTaskFlg] ; Task flag already set?
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44 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification
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45 |
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46 | mov ah, 90h ; Hard disk busy (AX=9000h)
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47 | int INTV_SYSTEM_SERVICES ; OS hook, device busy
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48 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting
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49 |
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50 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function
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51 | test ah, ah ; OS hook supported? (clears CF)
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52 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait
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53 | stc ; Set CF since wait done by OS
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54 | .ReturnFromWaitNotify:
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55 | pop ds
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56 | sti ; Enable interrupts
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57 | ret
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58 |
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59 |
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60 | ;--------------------------------------------------------------------
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61 | ; Clears task (interrupt) flag from BIOS Data Area.
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62 | ;
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63 | ; HIRQ_ClearTaskFlag
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64 | ; Parameters:
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65 | ; Nothing
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66 | ; Returns:
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67 | ; Nothing
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68 | ; Corrupts registers:
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69 | ; AX
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70 | ;--------------------------------------------------------------------
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71 | ALIGN JUMP_ALIGN
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72 | HIRQ_ClearTaskFlag:
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73 | push ds
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74 | LOAD_BDA_SEGMENT_TO ds, ax ; Also zero AX
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75 | mov [BDA.bHDTaskFlg], al
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76 | pop ds
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77 | ret
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78 |
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79 |
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80 | ;--------------------------------------------------------------------
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81 | ; IDE Interrupt Service Routines.
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82 | ;
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83 | ; HIRQ_InterruptServiceRoutineForIrqs2to7
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84 | ; HIRQ_InterruptServiceRoutineForIrqs8to15
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85 | ; Parameters:
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86 | ; Nothing
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87 | ; Returns:
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88 | ; Nothing
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89 | ; Corrupts registers:
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90 | ; Nothing
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91 | ;--------------------------------------------------------------------
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92 | ALIGN JUMP_ALIGN
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93 | HIRQ_InterruptServiceRoutineForIrqs2to7:
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94 | push ax
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95 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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96 |
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97 | mov al, CMD_END_OF_INTERRUPT
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98 | jmp SHORT AcknowledgeMasterInterruptController
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99 |
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100 | ALIGN JUMP_ALIGN
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101 | HIRQ_InterruptServiceRoutineForIrqs8to15:
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102 | push ax
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103 | call AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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104 |
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105 | mov al, CMD_END_OF_INTERRUPT ; Load EOI command to AL
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106 | out WPORT_8259SL_COMMAND, al ; Acknowledge Slave 8259
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107 | AcknowledgeMasterInterruptController:
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108 | out WPORT_8259MA_COMMAND, al ; Acknowledge Master 8259
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109 |
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110 | ; Issue Int 15h, function AX=9100h (Interrupt ready)
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111 | mov ax, 9100h ; Interrupt ready, device 0 (HD)
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112 | int INTV_SYSTEM_SERVICES
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113 |
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114 | pop ax ; Restore AX
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115 | iret
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116 |
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117 | ;--------------------------------------------------------------------
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118 | ; Acknowledges IDE interrupt by reading status register and
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119 | ; stores Status and Error Registers to BDA. Task flag in BDA will
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120 | ; also be set.
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121 | ;
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122 | ; AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA
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123 | ; Parameters:
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124 | ; Nothing
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125 | ; Returns:
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126 | ; Nothing
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127 | ; Corrupts registers:
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128 | ; AX
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129 | ;--------------------------------------------------------------------
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130 | ALIGN JUMP_ALIGN
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131 | AcknowledgeIdeInterruptAndStoreStatusAndErrorRegistersToBDA:
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132 | push ds
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133 | push di
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134 | push dx
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135 |
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136 | ; Reading Status Register acknowledges IDE interrupt
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137 | call RamVars_GetSegmentToDS
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138 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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139 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag
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140 |
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141 | pop dx
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142 | pop di
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143 | pop ds
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144 | ret
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