; Project name : XTIDE Universal BIOS ; Description : Functions for managing IDEPACK struct. ; Section containing code SECTION .text ;-------------------------------------------------------------------- ; Idepack_FakeToSSBP ; Parameters: ; Nothing ; Returns: ; SS:BP: Ptr to IDEPACK ; Corrupts registers: ; AX ;-------------------------------------------------------------------- Idepack_FakeToSSBP: pop ax sub sp, BYTE EXTRA_BYTES_FOR_INTPACK mov bp, sp jmp ax %ifdef MODULE_EBIOS ;;; ;;; TODO: This code may be dead, even with EBIOS enabled? ;;; ;-------------------------------------------------------------------- ; Idepack_ConvertDapToIdepackAndIssueCommandFromAH ; Parameters: ; AH: IDE command to issue ; BH: Timeout ticks ; BL: IDE Status Register flag to wait after command ; DS:DI: Ptr to DPT (in RAMVARS segment) ; ES:SI: Ptr to DAP (EBIOS Disk Address Packet) ; SS:BP: Ptr to IDEPACK ; Returns: ; AH: INT 13h Error Code ; CF: Cleared if success, Set if error ; Corrupts registers: ; AL, BX, CX, DX, SI, ES ;-------------------------------------------------------------------- ALIGN JUMP_ALIGN Idepack_ConvertDapToIdepackAndIssueCommandFromAH: mov [bp+IDEPACK.bCommand], ah mov ax, [es:si+DAP.wSectorCount] mov [bp+IDEPACK.bSectorCount], al mov [bp+IDEPACK.bSectorCountHighExt], ah mov al, [es:si+DAP.qwLBA] ; LBA byte 0 mov [bp+IDEPACK.bLbaLow], al mov ax, [es:si+DAP.qwLBA+1] ; LBA bytes 1 and 2 mov [bp+IDEPACK.wLbaMiddleAndHigh], ax mov ah, [es:si+DAP.qwLBA+3] ; LBA byte 3, LBA28 bits 24...27 mov [bp+IDEPACK.bLbaLowExt], ah mov cx, [es:si+DAP.qwLBA+4] ; LBA bytes 4 and 5 mov [bp+IDEPACK.wLbaMiddleAndHighExt], cx and ah, 0Fh ; Limit bits for LBA28 call AccessDPT_GetDriveSelectByteToAL or al, ah mov [bp+IDEPACK.bDrvAndHead], al les si, [es:si+DAP.dwMemoryAddress] jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer %endif ;-------------------------------------------------------------------- ; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH ; Parameters: ; AH: IDE command to issue ; AL: Number of sectors to transfer (1...255, 0=256) ; BH: Timeout ticks ; BL: IDE Status Register flag to wait after command ; CH: Cylinder number, bits 7...0 ; CL: Bits 7...6: Cylinder number bits 9 and 8 ; Bits 5...0: Starting sector number (1...63) ; DH: Starting head number (0...255) ; ES:SI: Ptr to data buffer ; DS:DI: Ptr to DPT (in RAMVARS segment) ; SS:BP: Ptr to IDEPACK ; Returns: ; AH: INT 13h Error Code ; CF: Cleared if success, Set if error ; Corrupts registers: ; AL, BX, CX, DX ;-------------------------------------------------------------------- ALIGN JUMP_ALIGN Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH: mov [bp+IDEPACK.bCommand], ah test al, al eCSETZ ah mov [bp+IDEPACK.bSectorCount], al mov [bp+IDEPACK.bSectorCountHighExt], ah push bx call Address_OldInt13hAddressToIdeAddress call AccessDPT_GetDriveSelectByteToAL or al, bh ; AL now has Drive and Head Select Byte mov [bp+IDEPACK.bDrvAndHead], al mov [bp+IDEPACK.bLbaLow], bl mov [bp+IDEPACK.wLbaMiddleAndHigh], cx pop bx GetDeviceControlByteToIdepackAndStartTransfer: call AccessDPT_GetDeviceControlByteToAL mov [bp+IDEPACK.bDeviceControl], al jmp Device_OutputCommandWithParameters ;-------------------------------------------------------------------- ; Idepack_StoreNonExtParametersAndIssueCommandFromAL ; Parameters: ; BH: Timeout ticks ; BL: IDE Status Register flag to wait after command ; AL: IDE command to issue ; AH: Parameter to Drive and Head Select Register (Head bits only) ; DL: Parameter to Sector Count Register ; DH: Parameter to LBA Low / Sector Number Register ; CL: Parameter to LBA Middle / Cylinder Low Register ; CH: Parameter to LBA High / Cylinder High Register ; SI: Parameter to Features Register ; DS:DI: Ptr to DPT (in RAMVARS segment) ; SS:BP: Ptr to IDEPACK ; Returns: ; AH: INT 13h Error Code ; CF: Cleared if success, Set if error ; Corrupts registers: ; AL, BX, CX, DX ;-------------------------------------------------------------------- ALIGN JUMP_ALIGN Idepack_StoreNonExtParametersAndIssueCommandFromAL: mov [bp+IDEPACK.bFeatures], si mov [bp+IDEPACK.bCommand], al mov [bp+IDEPACK.wSectorCountAndLbaLow], dx mov [bp+IDEPACK.wLbaMiddleAndHigh], cx mov BYTE [bp+IDEPACK.bSectorCountHighExt], 0 ; Drive and Head select byte and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only call AccessDPT_GetDriveSelectByteToAL or al, ah mov [bp+IDEPACK.bDrvAndHead], al ; Device Control byte with interrupts disabled call AccessDPT_GetDeviceControlByteToAL or al, FLG_DEVCONTROL_nIEN ; Disable interrupt mov [bp+IDEPACK.bDeviceControl], al jmp Device_OutputCommandWithParameters