[128] | 1 | ; Project name : XTIDE Universal BIOS |
---|
[3] | 2 | ; Description : Int 13h function AH=0h, Disk Controller Reset. |
---|
| 3 | |
---|
| 4 | ; Section containing code |
---|
| 5 | SECTION .text |
---|
| 6 | |
---|
| 7 | ;-------------------------------------------------------------------- |
---|
| 8 | ; Int 13h function AH=0h, Disk Controller Reset. |
---|
| 9 | ; |
---|
| 10 | ; AH0h_HandlerForDiskControllerReset |
---|
| 11 | ; Parameters: |
---|
[148] | 12 | ; DL: Translated Drive number (ignored so all drives are reset) |
---|
[3] | 13 | ; If bit 7 is set all hard disks and floppy disks reset. |
---|
[148] | 14 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
[150] | 15 | ; SS:BP: Ptr to IDEPACK |
---|
| 16 | ; Returns with INTPACK: |
---|
[23] | 17 | ; AH: Int 13h return status (from drive requested in DL) |
---|
[3] | 18 | ; CF: 0 if succesfull, 1 if error |
---|
| 19 | ;-------------------------------------------------------------------- |
---|
| 20 | ALIGN JUMP_ALIGN |
---|
| 21 | AH0h_HandlerForDiskControllerReset: |
---|
[23] | 22 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors |
---|
[26] | 23 | call ResetFloppyDrivesWithInt40h |
---|
[259] | 24 | |
---|
| 25 | %ifdef MODULE_SERIAL_FLOPPY |
---|
| 26 | ; |
---|
| 27 | ; "Reset" emulatd serial floppy drives, if any. There is nothing to actually do for this reset, |
---|
| 28 | ; but record the proper error return code if one of these floppy drives is the drive requested. |
---|
| 29 | ; |
---|
| 30 | call RamVars_UnpackFlopCntAndFirstToAL |
---|
| 31 | cbw ; Clears AH (there are flop drives) or ffh (there are not) |
---|
| 32 | ; Either AH has success code (flop drives are present) |
---|
| 33 | ; or it doesn't matter because we won't match drive ffh |
---|
| 34 | |
---|
| 35 | cwd ; clears DX (there are flop drives) or ffffh (there are not) |
---|
| 36 | |
---|
| 37 | adc dl, al ; second drive (CF set) if present |
---|
| 38 | ; If no drive is present, this will result in ffh which |
---|
| 39 | ; won't match a drive |
---|
| 40 | call BackupErrorCodeFromTheRequestedDriveToBH |
---|
| 41 | mov dl, al ; We may end up doing the first drive twice (if there is |
---|
| 42 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful. |
---|
| 43 | %endif |
---|
| 44 | |
---|
| 45 | test bl, bl ; If we were called with a floppy disk, then we are done, |
---|
| 46 | jns SHORT .SkipHardDiskReset ; don't do hard disks. |
---|
| 47 | |
---|
[26] | 48 | call ResetForeignHardDisks |
---|
[264] | 49 | |
---|
| 50 | ; Resetting our hard disks will modify dl and bl such that this call must be the last in the list |
---|
| 51 | ; |
---|
| 52 | call AH0h_ResetHardDisksHandledByOurBIOS |
---|
| 53 | |
---|
[26] | 54 | .SkipHardDiskReset: |
---|
[148] | 55 | mov ah, bh |
---|
| 56 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
---|
[3] | 57 | |
---|
| 58 | |
---|
| 59 | ;-------------------------------------------------------------------- |
---|
[26] | 60 | ; ResetFloppyDrivesWithInt40h |
---|
[3] | 61 | ; Parameters: |
---|
[23] | 62 | ; BL: Requested drive (DL when entering AH=00h) |
---|
| 63 | ; Returns: |
---|
| 64 | ; BH: Error code from requested drive (if available) |
---|
| 65 | ; Corrupts registers: |
---|
[27] | 66 | ; AX, DL, DI |
---|
[128] | 67 | ;-------------------------------------------------------------------- |
---|
[23] | 68 | ALIGN JUMP_ALIGN |
---|
[26] | 69 | ResetFloppyDrivesWithInt40h: |
---|
[27] | 70 | call GetDriveNumberForForeignBiosesToDL |
---|
| 71 | and dl, 7Fh ; Clear hard disk bit |
---|
[26] | 72 | xor ah, ah ; Disk Controller Reset |
---|
[148] | 73 | int BIOS_DISKETTE_INTERRUPT_40h |
---|
[26] | 74 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH |
---|
[23] | 75 | |
---|
| 76 | |
---|
| 77 | ;-------------------------------------------------------------------- |
---|
[26] | 78 | ; ResetForeignHardDisks |
---|
[23] | 79 | ; Parameters: |
---|
| 80 | ; BL: Requested drive (DL when entering AH=00h) |
---|
[3] | 81 | ; DS: RAMVARS segment |
---|
| 82 | ; Returns: |
---|
[23] | 83 | ; BH: Error code from requested drive (if available) |
---|
[3] | 84 | ; Corrupts registers: |
---|
[27] | 85 | ; AX, DL, DI |
---|
[128] | 86 | ;-------------------------------------------------------------------- |
---|
[23] | 87 | ALIGN JUMP_ALIGN |
---|
[26] | 88 | ResetForeignHardDisks: |
---|
[27] | 89 | call GetDriveNumberForForeignBiosesToDL |
---|
| 90 | xor ah, ah ; Disk Controller Reset |
---|
[32] | 91 | call Int13h_CallPreviousInt13hHandler |
---|
[258] | 92 | ;;; fall-through to BackupErrorCodeFromTheRequestedDriveToBH |
---|
[23] | 93 | |
---|
[26] | 94 | |
---|
[3] | 95 | ;-------------------------------------------------------------------- |
---|
[258] | 96 | ; BackupErrorCodeFromTheRequestedDriveToBH |
---|
| 97 | ; Parameters: |
---|
| 98 | ; AH: Error code from the last resetted drive |
---|
| 99 | ; DL: Drive last resetted |
---|
| 100 | ; BL: Requested drive (DL when entering AH=00h) |
---|
| 101 | ; Returns: |
---|
| 102 | ; BH: Backuped error code |
---|
| 103 | ; Corrupts registers: |
---|
| 104 | ; Nothing |
---|
| 105 | ;-------------------------------------------------------------------- |
---|
| 106 | ALIGN JUMP_ALIGN |
---|
| 107 | BackupErrorCodeFromTheRequestedDriveToBH: |
---|
| 108 | cmp dl, bl ; Requested drive? |
---|
| 109 | eCMOVE bh, ah |
---|
| 110 | ret |
---|
| 111 | |
---|
| 112 | |
---|
| 113 | ;-------------------------------------------------------------------- |
---|
[27] | 114 | ; GetDriveNumberForForeignBiosesToDL |
---|
| 115 | ; Parameters: |
---|
| 116 | ; BL: Requested drive (DL when entering AH=00h) |
---|
| 117 | ; DS: RAMVARS segment |
---|
| 118 | ; Returns: |
---|
| 119 | ; DL: BL if foreign drive |
---|
| 120 | ; 80h if our drive |
---|
| 121 | ; Corrupts registers: |
---|
| 122 | ; DI |
---|
[128] | 123 | ;-------------------------------------------------------------------- |
---|
[27] | 124 | ALIGN JUMP_ALIGN |
---|
| 125 | GetDriveNumberForForeignBiosesToDL: |
---|
| 126 | mov dl, bl |
---|
[262] | 127 | test di, di |
---|
| 128 | jz SHORT .Return ; Return what was in BL unmodified |
---|
[84] | 129 | mov dl, 80h |
---|
| 130 | .Return: |
---|
[27] | 131 | ret |
---|
| 132 | |
---|
| 133 | |
---|
| 134 | ;-------------------------------------------------------------------- |
---|
[150] | 135 | ; AH0h_ResetHardDisksHandledByOurBIOS |
---|
[23] | 136 | ; Parameters: |
---|
| 137 | ; BL: Requested drive (DL when entering AH=00h) |
---|
| 138 | ; DS: RAMVARS segment |
---|
[150] | 139 | ; SS:BP: Ptr to IDEPACK |
---|
[23] | 140 | ; Returns: |
---|
| 141 | ; BH: Error code from requested drive (if available) |
---|
| 142 | ; Corrupts registers: |
---|
[150] | 143 | ; AX, CX, DX, SI, DI |
---|
[23] | 144 | ;-------------------------------------------------------------------- |
---|
[3] | 145 | ALIGN JUMP_ALIGN |
---|
[27] | 146 | AH0h_ResetHardDisksHandledByOurBIOS: |
---|
[264] | 147 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl |
---|
| 148 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset |
---|
| 149 | |
---|
[262] | 150 | mov cl, [cs:ROMVARS.bIdeCnt] ; get count of ide controllers |
---|
[264] | 151 | mov ch, 0 |
---|
| 152 | jcxz .done ; just in case bIdeCnt is zero (shouldn't be) |
---|
| 153 | |
---|
| 154 | mov si, IterateFindFirstDPTforIdevars ; iteration routine (see below) |
---|
| 155 | |
---|
[262] | 156 | .loop: |
---|
| 157 | call IterateAllDPTs ; look for the first drive on this controller, if any |
---|
| 158 | jc .notFound |
---|
[264] | 159 | |
---|
[262] | 160 | call AHDh_ResetDrive ; reset master and slave on that controller |
---|
[264] | 161 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry |
---|
| 162 | |
---|
[262] | 163 | .notFound: |
---|
[264] | 164 | add dl, IDEVARS_size ; move Idevars pointer forward |
---|
| 165 | loop .loop |
---|
| 166 | |
---|
| 167 | .done: |
---|
[259] | 168 | ret |
---|
[258] | 169 | |
---|
[3] | 170 | ;-------------------------------------------------------------------- |
---|
[262] | 171 | ; Iteration routine for AH0h_ResetHardDisksHandledByOurBIOS, |
---|
| 172 | ; for use with IterateAllDPTs |
---|
| 173 | ; |
---|
| 174 | ; Returns when DPT is found on the controller with Idevars offset in DL |
---|
[3] | 175 | ;-------------------------------------------------------------------- |
---|
[262] | 176 | IterateFindFirstDPTforIdevars: |
---|
| 177 | cmp dl, [di+DPT.bIdevarsOffset] ; Clears CF if matched |
---|
| 178 | jz .done |
---|
| 179 | stc ; Set CF for not found |
---|
| 180 | .done: |
---|
[3] | 181 | ret |
---|