[150] | 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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[376] | 4 | ; |
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[526] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[526] | 12 | ; |
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[376] | 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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[526] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[526] | 18 | ; |
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[376] | 19 | |
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[150] | 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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[161] | 62 | sti ; Enable interrupts |
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[150] | 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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[152] | 85 | mov al, COMMAND_END_OF_INTERRUPT |
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[150] | 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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[152] | 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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[150] | 97 | AcknowledgeMasterInterruptController: |
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[152] | 98 | out MASTER_8259_COMMAND_out, al ; Acknowledge Master 8259 |
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[150] | 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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[152] | 121 | push si |
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[150] | 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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[233] | 127 | mov bl, FLGH_DPT_INTERRUPT_IN_SERVICE |
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| 128 | call FindDPT_ToDSDIforFlagsHighInBL |
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[238] | 129 | INPUT_TO_AL_FROM_IDE_REGISTER STATUS_REGISTER_in |
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[150] | 130 | |
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[152] | 131 | ; Clear Interrupt In-Service Flag from DPT |
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[158] | 132 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_INTERRUPT_IN_SERVICE |
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[152] | 133 | |
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[150] | 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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[152] | 140 | pop si |
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[150] | 141 | pop ds |
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| 142 | ret |
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