source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/RomVars.inc@ 344

; Project name  :   XTIDE Universal BIOS
; Description   :   Defines for ROMVARS struct containing variables stored
;                   in BIOS ROM.
%ifndef ROMVARS_INC
%define ROMVARS_INC

; ROM Variables. Written to the ROM image before flashing.
struc ROMVARS
    .wRomSign           resb    2   ; ROM Signature (AA55h)
    .bRomSize           resb    1   ; ROM size in 512 byte blocks
    .rgbJump            resb    3   ; First instruction to ROM init (jmp)

    .rgbSign            resb    8   ; Signature for XTIDE Configurator Program
    .szTitle            resb    31  ; BIOS title string
    .szVersion          resb    25  ; BIOS version string

    .wFlags             resb    2   ; Word for ROM flags
    .wDisplayMode       resb    2   ; Display mode for boot menu
    .wfDisplayBootMenu:             ; Zero = no Boot Menu, non-zero = Boot Menu timeout
    .wBootTimeout       resb    2   ; Boot Menu selection timeout in system timer ticks
    .bIdeCnt            resb    1   ; Number of available IDE controllers
    .bBootDrv           resb    1   ; Boot Menu default drive
    .bMinFddCnt         resb    1   ; Minimum number of Floppy Drives
    .bStealSize         resb    1   ; Number of 1kB blocks stolen from 640kB base RAM

    .ideVarsBegin:
    .ideVars0           resb    IDEVARS_size
    .ideVars1           resb    IDEVARS_size
    .ideVars2           resb    IDEVARS_size
    .ideVars3           resb    IDEVARS_size

%ifdef MODULE_SERIAL
    .ideVarsSerialAuto  resb    IDEVARS_size
%endif

    .ideVarsEnd:
endstruc

%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
    %if ROMVARS.ideVarsEnd & 0xff00 <> 0
        %error ".ideVars structures must fit within the first 256 bytes of the ROM image"
    %endif
    %if (ROMVARS.ideVarsEnd - ROMVARS.ideVarsBegin) = 0
        %error "there must be at least one .ideVars structure, it would be bizarre if this were not true, but it is assumed in the ah0h reset code."
    %endif
%endif

; Bit defines for ROMVARS.wFlags
FLG_ROMVARS_FULLMODE                EQU (1<<0)  ; Full operating mode (steals base RAM, supports EBIOS etc.)
FLG_ROMVARS_DRVXLAT                 EQU (1<<2)  ; Enable drive number translation
FLG_ROMVARS_SERIAL_SCANDETECT       EQU (1<<3)  ; Scan COM ports at the end of drive detection.  Can also be invoked
                                                ; by holding down the ALT key at the end of drive detection.
                                                ; (Conveniently, this is 8, a fact we exploit when testing the bit)
FLG_ROMVARS_MODULE_JRIDE            EQU (1<<5)  ; Here in case the configuration needs to know functionality is present
FLG_ROMVARS_MODULE_SERIAL           EQU (1<<6)  ; Here in case the configuration needs to know functionality is present
FLG_ROMVARS_MODULE_EBIOS            EQU (1<<7)  ; Here in case the configuration needs to know functionality is present

; Boot Menu Display Modes (see Assembly Library Display.inc for standard modes)
DEFAULT_TEXT_MODE       EQU 4


; Controller specific variables
struc IDEVARS
;;; Word 0
    .wSerialPortAndBaud:                    ; Serial connection port (low, divided by 4) and baud rate divisor (high)
    .wPort:                                 ; IDE Base Port for Command Block (usual) Registers
    .bSerialPort                resb    1
    .bSerialBaud                resb    1

;;; Word 1
    .wPortCtrl:
    .bSerialUnused              resb    1   ; IDE Base Port for Control Block Registers

    .wSerialCOMPortCharAndDevice:           ; In DetectPrint, we grab the COM Port char and Device at the same time
    .bSerialCOMPortChar         resb    1   ; Serial connection COM port number/letter

;;; Word 2
    .bDevice                    resb    1   ; Device type

    .bIRQ                       resb    1   ; Interrupt Request Number

;;; And more...
    .drvParamsMaster            resb    DRVPARAMS_size
    .drvParamsSlave             resb    DRVPARAMS_size
endstruc

%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
    %if IDEVARS.bSerialCOMPortChar+1 != IDEVARS.bDevice
        %error "IDEVARS.bSerialCOMPortChar needs to come immediately before IDEVARS.bDevice so that both bytes can be fetched at the same time inside DetectPrint.asm"
    %endif
%endif

; Default values for Port and PortCtrl, shared with the configurator
;
DEVICE_XTIDE_DEFAULT_PORT               EQU     300h
DEVICE_XTIDE_DEFAULT_PORTCTRL           EQU     308h
DEVICE_ATA_DEFAULT_PORT                 EQU     1F0h
DEVICE_ATA_DEFAULT_PORTCTRL             EQU     3F0h

; Device types for IDEVARS.bDevice
;
DEVICE_8BIT_DUAL_PORT_XTIDE             EQU (0<<1)
DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0    EQU (1<<1)
DEVICE_8BIT_SINGLE_PORT                 EQU (2<<1)
DEVICE_16BIT_ATA                        EQU (3<<1)
DEVICE_32BIT_ATA                        EQU (4<<1)
DEVICE_SERIAL_PORT                      EQU (5<<1)
DEVICE_JRIDE_ISA                        EQU (6<<1)


; Master/Slave drive specific parameters
struc DRVPARAMS
    .wFlags         resb    2   ; Drive flags
    .dwMaximumLBA:              ; User specified maximum number of sectors
    .wCylinders     resb    2   ; User specified cylinders (1...16383)
    .wHeadsAndSectors:
    .bHeads         resb    1   ; User specified Heads (1...16)
    .bSect          resb    1   ; User specified Sectors per track (1...63)
endstruc

; Bit defines for DRVPARAMS.wFlags
MASK_DRVPARAMS_WRITECACHE   EQU (3<<0)  ; Drive internal write cache settings (must start at bit 0)
FLG_DRVPARAMS_BLOCKMODE     EQU (1<<2)  ; Enable Block mode transfers
FLG_DRVPARAMS_USERCHS       EQU (1<<3)  ; User specified P-CHS values
FLG_DRVPARAMS_USERLBA       EQU (1<<4)  ; User specified LBA values

; Drive Write Cache values for DRVPARAMS.wFlags.MASK_DRVPARAMS_WRITECACHE
DEFAULT_WRITE_CACHE         EQU 0       ; Must be 0
DISABLE_WRITE_CACHE         EQU 1
ENABLE_WRITE_CACHE          EQU 2

%endif ; ROMVARS_INC