1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Interrupt handling related functions. |
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3 | |
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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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7 | ; |
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8 | ; This program is free software; you can redistribute it and/or modify |
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9 | ; it under the terms of the GNU General Public License as published by |
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10 | ; the Free Software Foundation; either version 2 of the License, or |
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11 | ; (at your option) any later version. |
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12 | ; |
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13 | ; This program is distributed in the hope that it will be useful, |
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | ; GNU General Public License for more details. |
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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18 | ; |
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19 | |
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20 | ; Section containing code |
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21 | SECTION .text |
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22 | |
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23 | ;-------------------------------------------------------------------- |
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24 | ; IdeIrq_WaitForIRQ |
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25 | ; Parameters: |
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26 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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27 | ; Returns: |
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28 | ; CF: Set if wait done by operating system |
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29 | ; Cleared if BIOS must perform task flag polling |
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30 | ; Corrupts registers: |
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31 | ; AX |
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32 | ;-------------------------------------------------------------------- |
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33 | ALIGN JUMP_ALIGN |
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34 | IdeIrq_WaitForIRQ: |
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35 | |
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36 | ;-------------------------------------------------------------------- |
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37 | ; .NotifyOperatingSystemAboutWaitingForIRQ |
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38 | ; Parameters: |
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39 | ; Nothing |
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40 | ; Returns: |
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41 | ; CF: Set if wait done by operating system |
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42 | ; Cleared if BIOS must perform task flag polling |
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43 | ; Corrupts registers: |
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44 | ; AX |
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45 | ;-------------------------------------------------------------------- |
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46 | .NotifyOperatingSystemAboutWaitingForIRQ: |
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47 | push ds |
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48 | |
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49 | LOAD_BDA_SEGMENT_TO ds, ax, ! ; Zero AX |
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50 | mov ah, OS_HOOK_DEVICE_BUSY ; Hard disk busy (AX=9000h) |
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51 | cli ; Disable interrupts |
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52 | cmp al, [BDA.bHDTaskFlg] ; Task flag already set? |
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53 | jc SHORT .ReturnFromWaitNotify ; If so, skip OS notification |
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54 | int BIOS_SYSTEM_INTERRUPT_15h ; OS hook, device busy |
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55 | jnc SHORT .ReturnFromWaitNotify ; CF cleared, BIOS handles waiting |
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56 | |
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57 | ; Make sure that OS hooks are supported, otherwise the CF means unsupported function |
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58 | test ah, ah ; OS hook supported? (clears CF) |
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59 | jnz SHORT .ReturnFromWaitNotify ; AH has error, BIOS must do the wait |
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60 | stc ; Set CF since wait done by OS |
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61 | .ReturnFromWaitNotify: |
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62 | sti ; Enable interrupts |
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63 | pop ds |
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64 | ret |
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65 | |
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66 | |
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67 | ;-------------------------------------------------------------------- |
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68 | ; IDE Interrupt Service Routines. |
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69 | ; |
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70 | ; IdeIrq_InterruptServiceRoutineForIrqs2to7 |
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71 | ; IdeIrq_InterruptServiceRoutineForIrqs8to15 |
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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 | ; Nothing |
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78 | ;-------------------------------------------------------------------- |
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79 | ALIGN JUMP_ALIGN |
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80 | IdeIrq_InterruptServiceRoutineForIrqs2to7: |
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81 | push di |
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82 | push ax |
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83 | call AcknowledgeIdeInterruptAndSetTaskFlag |
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84 | |
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85 | mov al, COMMAND_END_OF_INTERRUPT |
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86 | jmp SHORT AcknowledgeMasterInterruptController |
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87 | |
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88 | |
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89 | ALIGN JUMP_ALIGN |
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90 | IdeIrq_InterruptServiceRoutineForIrqs8to15: |
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91 | push di |
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92 | push ax |
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93 | call AcknowledgeIdeInterruptAndSetTaskFlag |
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94 | |
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95 | mov al, COMMAND_END_OF_INTERRUPT |
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96 | out SLAVE_8259_COMMAND_out, al ; Acknowledge Slave 8259 |
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97 | AcknowledgeMasterInterruptController: |
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98 | out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259 |
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99 | |
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100 | ; Issue Int 15h, function AX=9100h (Interrupt ready) |
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101 | mov ax, OS_HOOK_DEVICE_POST<<8 ; Interrupt ready, device 0 (HD) |
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102 | int BIOS_SYSTEM_INTERRUPT_15h |
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103 | |
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104 | pop ax |
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105 | pop di |
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106 | iret |
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107 | |
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108 | |
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109 | ;-------------------------------------------------------------------- |
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110 | ; AcknowledgeIdeInterruptAndSetTaskFlag |
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111 | ; Parameters: |
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112 | ; Nothing |
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113 | ; Returns: |
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114 | ; Nothing |
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115 | ; Corrupts registers: |
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116 | ; AX |
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117 | ;-------------------------------------------------------------------- |
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118 | ALIGN JUMP_ALIGN |
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119 | AcknowledgeIdeInterruptAndSetTaskFlag: |
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120 | push ds |
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121 | push si |
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122 | push dx |
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123 | push bx |
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124 | |
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125 | ; Reading Status Register acknowledges IDE interrupt |
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126 | call RamVars_GetSegmentToDS |
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127 | mov bl, FLGH_DPT_INTERRUPT_IN_SERVICE |
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128 | call FindDPT_ToDSDIforFlagsHighInBL |
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129 | INPUT_TO_AL_FROM_IDE_REGISTER STATUS_REGISTER_in |
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130 | |
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131 | ; Clear Interrupt In-Service Flag from DPT |
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132 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE |
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133 | |
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134 | ; Set Task Flag |
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135 | LOAD_BDA_SEGMENT_TO ds, ax |
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136 | mov BYTE [BDA.bHDTaskFlg], 0FFh ; Set task flag |
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137 | |
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138 | pop bx |
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139 | pop dx |
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140 | pop si |
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141 | pop ds |
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142 | ret |
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