[90] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Int 13h BIOS functions (Floppy and Hard disk). |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; Macro that prints drive and function number. |
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| 9 | ; Used only for debugging. |
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| 10 | ; |
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| 11 | ; DEBUG_PRINT_DRIVE_AND_FUNCTION |
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| 12 | ; Parameters: |
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| 13 | ; AH: INT 13h function number |
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| 14 | ; DL: Drive number |
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| 15 | ; Returns: |
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| 16 | ; Nothing |
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| 17 | ; Corrupts registers: |
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| 18 | ; Nothing |
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| 19 | ;-------------------------------------------------------------------- |
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| 20 | %macro DEBUG_PRINT_DRIVE_AND_FUNCTION 0 |
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| 21 | push dx |
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| 22 | push ax |
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| 23 | mov al, dl |
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| 24 | call Print_IntHexW |
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| 25 | pop ax |
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| 26 | pop dx |
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| 27 | %endmacro |
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| 28 | |
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| 29 | |
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| 30 | ;-------------------------------------------------------------------- |
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| 31 | ; Int 13h software interrupt handler. |
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| 32 | ; Jumps to specific function defined in AH. |
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| 33 | ; |
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| 34 | ; Int13h_Jump |
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| 35 | ; Parameters: |
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| 36 | ; AH: Bios function |
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| 37 | ; DL: Drive number |
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| 38 | ; Returns: |
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| 39 | ; Depends on function |
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| 40 | ; Corrupts registers: |
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| 41 | ; Flags |
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| 42 | ;-------------------------------------------------------------------- |
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| 43 | ALIGN JUMP_ALIGN |
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| 44 | Int13h_DiskFunctions: |
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| 45 | ; Save registers |
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| 46 | sti ; Enable interrupts |
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| 47 | push ds ; Store DS |
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| 48 | push di ; Store DI |
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| 49 | |
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| 50 | ;DEBUG_PRINT_DRIVE_AND_FUNCTION |
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| 51 | call RamVars_GetSegmentToDS |
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| 52 | call DriveXlate_WhenEnteringInt13h |
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| 53 | call RamVars_IsFunctionHandledByThisBIOS |
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| 54 | jnc SHORT Int13h_DirectCallToAnotherBios |
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[28] | 55 | ;DEBUG_PRINT_DRIVE_AND_FUNCTION |
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[3] | 56 | |
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| 57 | ; Jump to correct BIOS function |
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| 58 | cmp ah, 25h ; Valid BIOS function? |
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| 59 | ja SHORT Int13h_UnsupportedFunction |
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| 60 | mov di, ax |
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[84] | 61 | %ifndef USE_186 ; This uses 9 bytes less and is about 5 cycles faster |
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| 62 | mov al, ah ; Copy bits in AH to AL and then |
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| 63 | shl al, 1 ; shift them "back" 1 step |
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| 64 | and al, 7Eh ; AND them (clears the MSB) |
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| 65 | cbw ; Clear AH using sign extension |
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| 66 | xchg di, ax ; and finally swap DI with AX |
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| 67 | %else |
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[3] | 68 | eSHR_IM di, 7 ; Shift function to DI... |
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| 69 | and di, BYTE 7Eh ; ...and prepare for word lookup |
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[84] | 70 | %endif |
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[3] | 71 | jmp [cs:di+g_rgw13hFuncJump] ; Jump to BIOS function |
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| 72 | |
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| 73 | |
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| 74 | ;-------------------------------------------------------------------- |
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| 75 | ; Directs call to another INT13h function whose pointer is |
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| 76 | ; stored to RAMVARS. |
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| 77 | ; |
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| 78 | ; Int13h_DirectCallToAnotherBios |
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| 79 | ; Parameters: |
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| 80 | ; AH: Bios function |
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| 81 | ; DL: Drive number |
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| 82 | ; DS: RAMVARS segment |
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| 83 | ; DI: Corrupted |
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| 84 | ; Stack from top to down: |
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| 85 | ; Original DI |
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| 86 | ; Original DS |
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| 87 | ; Returns: |
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| 88 | ; Depends on function |
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| 89 | ; Corrupts registers: |
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| 90 | ; Flags |
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| 91 | ;-------------------------------------------------------------------- |
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| 92 | ALIGN JUMP_ALIGN |
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| 93 | Int13h_UnsupportedFunction: |
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| 94 | Int13h_DirectCallToAnotherBios: |
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[27] | 95 | ; Temporarily store original DI and DS from stack to RAMVARS |
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[3] | 96 | pop WORD [RAMVARS.wI13hDI] |
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| 97 | pop WORD [RAMVARS.wI13hDS] |
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| 98 | |
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| 99 | ; Special return processing required if target function |
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| 100 | ; returns something in DL |
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[35] | 101 | mov di, Int13h_ReturnFromAnotherBiosWithValueInDL |
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[3] | 102 | call DriveXlate_DoesFunctionReturnSomethingInDL |
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| 103 | jc SHORT .PushIretAddress |
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[35] | 104 | add di, BYTE Int13h_ReturnFromAnotherBios - Int13h_ReturnFromAnotherBiosWithValueInDL |
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[3] | 105 | .PushIretAddress: |
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| 106 | pushf ; Push FLAGS to simulate INT |
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| 107 | push cs ; Push return segment |
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| 108 | push di ; Push return offset |
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| 109 | |
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| 110 | ; "Return" to another INT 13h with original DI and DS |
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| 111 | push WORD [RAMVARS.fpOldI13h+2] ; Segment |
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| 112 | push WORD [RAMVARS.fpOldI13h] ; Offset |
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| 113 | lds di, [RAMVARS.dwI13DIDS] |
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| 114 | cli ; Disable interrupts as INT would |
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| 115 | retf |
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| 116 | |
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| 117 | |
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| 118 | ;-------------------------------------------------------------------- |
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[32] | 119 | ; Int13h_CallPreviousInt13hHandler |
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| 120 | ; Parameters: |
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| 121 | ; AH: Bios function |
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| 122 | ; DS: RAMVARS segment |
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| 123 | ; Other: Depends on function to call |
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| 124 | ; Returns: |
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| 125 | ; Depends on function to call |
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| 126 | ; Corrupts registers: |
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[43] | 127 | ; Nothing |
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[32] | 128 | ;-------------------------------------------------------------------- |
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| 129 | ALIGN JUMP_ALIGN |
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| 130 | Int13h_CallPreviousInt13hHandler: |
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| 131 | pushf ; Push flags to simulate INT |
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| 132 | cli ; Disable interrupts since INT does that |
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| 133 | call FAR [RAMVARS.fpOldI13h] |
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| 134 | sti |
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| 135 | ret |
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| 136 | |
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| 137 | |
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| 138 | ;-------------------------------------------------------------------- |
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[35] | 139 | ; Int13h_ReturnFromAnotherBiosWithValueInDL |
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[3] | 140 | ; Int13h_ReturnFromAnotherBios |
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| 141 | ; Parameters: |
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| 142 | ; AH: Error code |
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| 143 | ; DL: Drive number (only on Int13h_ReturnFromAnotherBios) |
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| 144 | ; CF: Error status |
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| 145 | ; Returns: |
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| 146 | ; Depends on function |
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| 147 | ; Corrupts registers: |
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| 148 | ; Nothing (not even FLAGS) |
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| 149 | ;-------------------------------------------------------------------- |
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| 150 | ALIGN JUMP_ALIGN |
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[35] | 151 | Int13h_ReturnFromAnotherBiosWithValueInDL: |
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[3] | 152 | push ds |
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| 153 | push di |
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| 154 | pushf ; Store return flags |
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| 155 | call RamVars_GetSegmentToDS |
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[35] | 156 | call DriveXlate_WhenLeavingInt13hWithReturnValueInDL |
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[3] | 157 | jmp SHORT Int13h_Leave |
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[35] | 158 | |
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[3] | 159 | ALIGN JUMP_ALIGN |
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| 160 | Int13h_ReturnFromAnotherBios: |
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| 161 | push ds |
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| 162 | push di |
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| 163 | pushf ; Store return flags |
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| 164 | call RamVars_GetSegmentToDS |
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| 165 | call DriveXlate_WhenLeavingInt13h |
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| 166 | jmp SHORT Int13h_Leave |
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| 167 | |
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| 168 | |
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| 169 | ;-------------------------------------------------------------------- |
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| 170 | ; Returns from any BIOS function implemented by this BIOS. |
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| 171 | ; |
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[35] | 172 | ; Int13h_ReturnWithValueInDL |
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[3] | 173 | ; Int13h_PopXRegsAndReturn |
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| 174 | ; Int13h_PopDiDsAndReturn |
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| 175 | ; Parameters: |
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| 176 | ; DL: Drive number (not Int13h_ReturnWithoutSwappingDrives) |
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| 177 | ; DS: RAMVARS segment |
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| 178 | ; Returns: |
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| 179 | ; Depends on function |
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| 180 | ; Corrupts registers: |
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| 181 | ; Nothing (not even FLAGS) |
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| 182 | ;-------------------------------------------------------------------- |
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| 183 | ALIGN JUMP_ALIGN |
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[35] | 184 | Int13h_ReturnWithValueInDL: |
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[3] | 185 | pushf |
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[35] | 186 | call DriveXlate_WhenLeavingInt13hWithReturnValueInDL |
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| 187 | jmp SHORT Int13h_LeaveAfterStoringErrorCodeToBDA |
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[28] | 188 | |
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[3] | 189 | ALIGN JUMP_ALIGN |
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| 190 | Int13h_PopXRegsAndReturn: |
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| 191 | pop bx ; Pop old AX to BX |
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| 192 | mov al, bl ; Restore AL |
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| 193 | pop bx |
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| 194 | pop cx |
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| 195 | pop dx |
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[35] | 196 | ; Fall to Int13h_PopDiDsAndReturn |
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| 197 | |
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[3] | 198 | ALIGN JUMP_ALIGN |
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| 199 | Int13h_PopDiDsAndReturn: |
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| 200 | pushf |
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| 201 | call DriveXlate_WhenLeavingInt13h |
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[35] | 202 | ; Fall to Int13h_LeaveAfterStoringErrorCodeToBDA |
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| 203 | |
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| 204 | Int13h_LeaveAfterStoringErrorCodeToBDA: |
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| 205 | LOAD_BDA_SEGMENT_TO ds, di |
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| 206 | mov [BDA.bHDStatus], ah |
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| 207 | ; Fall to Int13h_Leave |
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| 208 | |
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[3] | 209 | Int13h_Leave: |
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| 210 | popf |
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| 211 | pop di |
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| 212 | pop ds |
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| 213 | retf 2 |
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| 214 | |
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| 215 | |
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| 216 | ; Jump table for correct BIOS function |
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| 217 | ALIGN WORD_ALIGN |
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| 218 | g_rgw13hFuncJump: |
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| 219 | dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All) |
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| 220 | dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All) |
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| 221 | dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All) |
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| 222 | dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All) |
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| 223 | dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All) |
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[90] | 224 | dw Int13h_UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA) |
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[3] | 225 | dw Int13h_UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT) |
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| 226 | dw Int13h_UnsupportedFunction ; 07h, Format Multiple Cylinders (XT) |
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| 227 | dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All) |
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| 228 | dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All) |
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| 229 | dw Int13h_UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA) |
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| 230 | dw Int13h_UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA) |
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| 231 | dw AHCh_HandlerForSeek ; 0Ch, Seek (All) |
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| 232 | dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All) |
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| 233 | dw Int13h_UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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| 234 | dw Int13h_UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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| 235 | dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All) |
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| 236 | dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All) |
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| 237 | dw Int13h_UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT) |
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| 238 | dw Int13h_UnsupportedFunction ; 13h, Drive Diagnostic (XT) |
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[90] | 239 | dw Int13h_UnsupportedFunction ; 14h, Controller Internal Diagnostic (All) |
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[3] | 240 | dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+) |
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| 241 | dw Int13h_UnsupportedFunction ; 16h, |
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| 242 | dw Int13h_UnsupportedFunction ; 17h, |
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| 243 | dw Int13h_UnsupportedFunction ; 18h, |
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| 244 | dw Int13h_UnsupportedFunction ; 19h, Park Heads (PS/2) |
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| 245 | dw Int13h_UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2) |
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| 246 | dw Int13h_UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2) |
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| 247 | dw Int13h_UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2) |
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| 248 | dw Int13h_UnsupportedFunction ; 1Dh, |
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| 249 | dw Int13h_UnsupportedFunction ; 1Eh, |
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| 250 | dw Int13h_UnsupportedFunction ; 1Fh, |
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| 251 | dw Int13h_UnsupportedFunction ; 20h, |
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| 252 | dw Int13h_UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1) |
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| 253 | dw Int13h_UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1) |
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| 254 | dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1) |
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| 255 | dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1) |
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| 256 | dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1) |
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| 257 | ; dw Int13h_UnsupportedFunction ; 26h, |
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| 258 | ; dw Int13h_UnsupportedFunction ; 27h, |
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| 259 | ; dw Int13h_UnsupportedFunction ; 28h, |
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| 260 | ; dw Int13h_UnsupportedFunction ; 29h, |
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| 261 | ; dw Int13h_UnsupportedFunction ; 2Ah, |
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| 262 | ; dw Int13h_UnsupportedFunction ; 2Bh, |
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| 263 | ; dw Int13h_UnsupportedFunction ; 2Ch, |
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| 264 | ; dw Int13h_UnsupportedFunction ; 2Dh, |
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| 265 | ; dw Int13h_UnsupportedFunction ; 2Eh, |
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| 266 | ; dw Int13h_UnsupportedFunction ; 2Fh, |
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| 267 | ; dw Int13h_UnsupportedFunction ; 30h, |
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| 268 | ; dw Int13h_UnsupportedFunction ; 31h, |
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| 269 | ; dw Int13h_UnsupportedFunction ; 32h, |
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| 270 | ; dw Int13h_UnsupportedFunction ; 33h, |
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| 271 | ; dw Int13h_UnsupportedFunction ; 34h, |
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| 272 | ; dw Int13h_UnsupportedFunction ; 35h, |
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| 273 | ; dw Int13h_UnsupportedFunction ; 36h, |
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| 274 | ; dw Int13h_UnsupportedFunction ; 37h, |
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| 275 | ; dw Int13h_UnsupportedFunction ; 38h, |
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| 276 | ; dw Int13h_UnsupportedFunction ; 39h, |
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| 277 | ; dw Int13h_UnsupportedFunction ; 3Ah, |
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| 278 | ; dw Int13h_UnsupportedFunction ; 3Bh, |
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| 279 | ; dw Int13h_UnsupportedFunction ; 3Ch, |
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| 280 | ; dw Int13h_UnsupportedFunction ; 3Dh, |
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| 281 | ; dw Int13h_UnsupportedFunction ; 3Eh, |
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| 282 | ; dw Int13h_UnsupportedFunction ; 3Fh, |
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| 283 | ; dw Int13h_UnsupportedFunction ; 40h, |
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| 284 | ; dw Int13h_UnsupportedFunction ; 41h, Check if Extensions Present (EBIOS) |
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| 285 | ; dw Int13h_UnsupportedFunction ; 42h, Extended Read Sectors (EBIOS) |
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| 286 | ; dw Int13h_UnsupportedFunction ; 43h, Extended Write Sectors (EBIOS) |
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| 287 | ; dw Int13h_UnsupportedFunction ; 44h, Extended Verify Sectors (EBIOS) |
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| 288 | ; dw Int13h_UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS) |
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| 289 | ; dw Int13h_UnsupportedFunction ; 46h, Eject Media Request (EBIOS) |
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| 290 | ; dw Int13h_UnsupportedFunction ; 47h, Extended Seek (EBIOS) |
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| 291 | ; dw Int13h_UnsupportedFunction ; 48h, Get Extended Drive Parameters (EBIOS) |
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| 292 | ; dw Int13h_UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS) |
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| 293 | ; dw Int13h_UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM) |
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| 294 | ; dw Int13h_UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM) |
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| 295 | ; dw Int13h_UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM) |
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| 296 | ; dw Int13h_UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM) |
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| 297 | ; dw Int13h_UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS) |
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