[148] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Int 13h function AH=23h, |
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| 3 | ; Set Controller Features Register. |
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| 4 | |
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| 5 | ; Section containing code |
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| 6 | SECTION .text |
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| 7 | |
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| 8 | ;-------------------------------------------------------------------- |
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| 9 | ; Int 13h function AH=23h, Set Controller Features Register. |
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| 10 | ; |
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| 11 | ; AH23h_HandlerForSetControllerFeatures |
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| 12 | ; Parameters: |
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[148] | 13 | ; AL, CX: Same as in INTPACK |
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| 14 | ; DL: Translated Drive number |
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| 15 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 16 | ; SS:BP: Ptr to INTPACK |
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| 17 | ; Parameters on INTPACK in SS:BP: |
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[3] | 18 | ; AL: Feature Number (parameter to Features Register = subcommand) |
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[148] | 19 | ; (Parameter registers are undocumented, there are specific for this BIOS): |
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[3] | 20 | ; BH: Parameter to Sector Count Register (subcommand specific) |
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| 21 | ; BL: Parameter to Sector Number Register (subcommand specific) |
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| 22 | ; CL: Parameter to Low Cylinder Register (subcommand specific) |
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| 23 | ; CH: Parameter to High Cylinder Register (subcommand specific) |
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[148] | 24 | ; Returns with INTPACK in SS:BP: |
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| 25 | ; AH: Int 13h return status |
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| 26 | ; CF: 0 if succesfull, 1 if error |
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| 27 | ;-------------------------------------------------------------------- |
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| 28 | ALIGN JUMP_ALIGN |
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| 29 | AH23h_HandlerForSetControllerFeatures: |
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| 30 | %ifndef USE_186 |
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| 31 | call AH23h_SetControllerFeatures |
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| 32 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 33 | %else |
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| 34 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 35 | ; Fall through to AH23h_SetControllerFeatures |
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| 36 | %endif |
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| 37 | |
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| 38 | |
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| 39 | ;-------------------------------------------------------------------- |
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| 40 | ; AH23h_SetControllerFeatures |
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| 41 | ; Parameters: |
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| 42 | ; AL: Feature Number (parameter to Features Register = subcommand) |
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| 43 | ; BH: Parameter to Sector Count Register (subcommand specific) |
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| 44 | ; BL: Parameter to Sector Number Register (subcommand specific) |
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| 45 | ; CL: Parameter to Low Cylinder Register (subcommand specific) |
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| 46 | ; CH: Parameter to High Cylinder Register (subcommand specific) |
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| 47 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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[3] | 48 | ; Returns: |
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| 49 | ; AH: Int 13h return status |
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| 50 | ; CF: 0 if succesfull, 1 if error |
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| 51 | ; Corrupts registers: |
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[148] | 52 | ; AX, BX, CX, DX, SI |
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[3] | 53 | ;-------------------------------------------------------------------- |
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| 54 | ALIGN JUMP_ALIGN |
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[148] | 55 | AH23h_SetControllerFeatures: |
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[3] | 56 | ; Backup AL and BH to SI |
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| 57 | mov ah, bh |
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| 58 | xchg si, ax |
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| 59 | |
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| 60 | ; Select Master or Slave and wait until ready |
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| 61 | call HDrvSel_SelectDriveAndDisableIRQ |
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[148] | 62 | jc SHORT .ReturnWithErrorCodeInAH |
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[3] | 63 | |
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| 64 | ; Output Feature Number |
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| 65 | mov ax, si ; Feature number to AL |
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| 66 | mov dx, [RAMVARS.wIdeBase] ; Load base port address |
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| 67 | inc dx ; REGW_IDE_FEAT |
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| 68 | out dx, al |
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| 69 | |
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| 70 | ; Output parameters to Sector Number Register and Cylinder Registers |
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| 71 | xor bh, bh ; Zero head number |
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| 72 | dec dx ; Back to base port address |
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| 73 | call HCommand_OutputTranslatedLCHSaddress |
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| 74 | |
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| 75 | ; Output parameter to Sector Count Register and command |
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| 76 | xchg ax, si ; Sector Count Reg param to AH |
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| 77 | mov al, ah ; Sector Count Reg param to AL |
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| 78 | mov ah, HCMD_SET_FEAT ; Load Set Features command to AH |
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| 79 | call HCommand_OutputSectorCountAndCommand |
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| 80 | |
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[148] | 81 | jmp HStatus_WaitBsyDefTime ; Wait until drive ready |
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| 82 | .ReturnWithErrorCodeInAH: |
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| 83 | ret |
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