source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Inc/RomVars.inc @ 545

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

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

%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
    .wBootTimeout       resb    2   ; Boot Menu selection timeout in system timer ticks
    .bIdeCnt            resb    1   ; Number of available IDE controllers
    .bBootDrv           resb    1   ; Default drive to boot from
    .bMinFddCnt         resb    1   ; Minimum number of Floppy Drives
    .bStealSize         resb    1   ; Number of 1kB blocks stolen from 640kB base RAM
    .bIdleTimeout       resb    1   ; Standby timer value

    .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

NUMBER_OF_IDEVARS                   EQU ((ROMVARS.ideVarsEnd - ROMVARS.ideVarsBegin) / IDEVARS_size)

; Bit defines for ROMVARS.wFlags
FLG_ROMVARS_FULLMODE                EQU (1<<0)  ; Full operating mode (steals base RAM, supports EBIOS etc.)
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)

; Here in case the configuration needs to know functionality is present
FLG_ROMVARS_MODULE_FEATURE_SETS         EQU (1<<5)
FLG_ROMVARS_MODULE_8BIT_IDE             EQU (1<<6)
FLG_ROMVARS_MODULE_8BIT_IDE_ADVANCED    EQU (1<<7)
FLG_ROMVARS_MODULE_ADVANCED_ATA         EQU (1<<8)
FLG_ROMVARS_MODULE_BOOT_MENU            EQU (1<<9)
FLG_ROMVARS_MODULE_EBIOS                EQU (1<<10)
FLG_ROMVARS_MODULE_HOTKEYS              EQU (1<<11)
FLG_ROMVARS_MODULE_IRQ                  EQU (1<<12)
FLG_ROMVARS_MODULE_SERIAL               EQU (1<<13)
FLG_ROMVARS_MODULE_SERIAL_FLOPPY        EQU (1<<14)
FLG_ROMVARS_MODULE_STRINGS_COMPRESSED   EQU (1<<15)


; 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)
    .wBasePort:                             ; IDE Base Port for Command Block (usual) Registers
    .bSerialPort                resb    1
    .bSerialBaud                resb    1

;;; Word 1
    .wControlBlockPort:
    .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

STANDARD_CONTROL_BLOCK_OFFSET           EQU     200h
XTIDE_CONTROL_BLOCK_OFFSET              EQU     8h      ; for XTIDE, A3 is used to control selected register (CS0 vs CS1)...
XTCF_CONTROL_BLOCK_OFFSET               EQU     10h     ; ...and for XT-CF (all varients), it's A4
ADP50L_CONTROL_BLOCK_OFFSET             EQU     10h

; Default values for Port and PortCtrl, shared with the configurator
;
DEVICE_XTIDE_DEFAULT_PORT               EQU     300h    ; Also the default port for XT-CF
DEVICE_XTIDE_DEFAULT_PORTCTRL           EQU     (DEVICE_XTIDE_DEFAULT_PORT + XTIDE_CONTROL_BLOCK_OFFSET)
; Note XT-CF control port is SHL 1 relative to XTIDE, and coded that way hence no need for specific definition like...
; DEVICE_XTCF_DEFAULT_PORTCTRL              EQU     (DEVICE_XTIDE_DEFAULT_PORT + XTCF_CONTROL_BLOCK_OFFSET)

DEVICE_ATA_PRIMARY_PORT                 EQU     1F0h
DEVICE_ATA_PRIMARY_PORTCTRL             EQU     (DEVICE_ATA_PRIMARY_PORT + STANDARD_CONTROL_BLOCK_OFFSET)

DEVICE_ATA_SECONDARY_PORT               EQU     170h
DEVICE_ATA_SECONDARY_PORTCTRL           EQU     (DEVICE_ATA_SECONDARY_PORT + STANDARD_CONTROL_BLOCK_OFFSET)

DEVICE_ATA_TERTIARY_PORT                EQU     1E8h
DEVICE_ATA_TERTIARY_PORTCTRL            EQU     (DEVICE_ATA_TERTIARY_PORT + STANDARD_CONTROL_BLOCK_OFFSET)

DEVICE_ATA_QUATERNARY_PORT              EQU     168h
DEVICE_ATA_QUATERNARY_PORTCTRL          EQU     (DEVICE_ATA_QUATERNARY_PORT + STANDARD_CONTROL_BLOCK_OFFSET)


; Device types for IDEVARS.bDevice
; IDE Devices are grouped so device numbers cannot be changed without modifying code elsewhere!
;
COUNT_OF_STANDARD_IDE_DEVICES           EQU 2   ; 16- and 32-bit controllers
COUNT_OF_8BIT_IDE_DEVICES               EQU 8
COUNT_OF_ALL_IDE_DEVICES                EQU (COUNT_OF_8BIT_IDE_DEVICES + COUNT_OF_STANDARD_IDE_DEVICES)
; Standard port mapped I/O
DEVICE_16BIT_ATA                        EQU (0<<1)
DEVICE_32BIT_ATA                        EQU (1<<1)
DEVICE_8BIT_ATA                         EQU ((COUNT_OF_STANDARD_IDE_DEVICES+0)<<1)  ; 16- or 32-bit controller in 8-bit mode
DEVICE_8BIT_XTIDE_REV1                  EQU ((COUNT_OF_STANDARD_IDE_DEVICES+1)<<1)
; Address lines A0 and A3 are swapped
DEVICE_8BIT_XTIDE_REV2                  EQU ((COUNT_OF_STANDARD_IDE_DEVICES+2)<<1)  ; Or rev 1 with swapped A0 and A3
; IDE Register offsets are SHL 1
DEVICE_8BIT_XTCF_PIO8                   EQU ((COUNT_OF_STANDARD_IDE_DEVICES+3)<<1)  ; XT-CF using 8-bit PIO mode
DEVICE_8BIT_XTCF_PIO8_WITH_BIU_OFFLOAD  EQU ((COUNT_OF_STANDARD_IDE_DEVICES+4)<<1)  ; XT-CF using 8-bit PIO mode, but with 16-bit instructions
DEVICE_8BIT_XTCF_DMA                    EQU ((COUNT_OF_STANDARD_IDE_DEVICES+5)<<1)  ; XT-CFv3 using DMA
; Memory Mapped I/O
DEVICE_8BIT_JRIDE_ISA                   EQU ((COUNT_OF_STANDARD_IDE_DEVICES+6)<<1)  ; JR-IDE/ISA (Memory Mapped I/O)
DEVICE_8BIT_ADP50L                      EQU ((COUNT_OF_STANDARD_IDE_DEVICES+7)<<1)  ; SVC ADP50L (Memory Mapped I/O)
; Virtual devices
DEVICE_SERIAL_PORT                      EQU (COUNT_OF_ALL_IDE_DEVICES<<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)  ; Bits 0...1, Drive internal write cache settings (must start at bit 0)
    DEFAULT_WRITE_CACHE             EQU 0   ; Must be 0
    DISABLE_WRITE_CACHE             EQU 1
    ENABLE_WRITE_CACHE              EQU 2
MASK_DRVPARAMS_TRANSLATEMODE    EQU (3<<TRANSLATEMODE_FIELD_POSITION)   ; Bits 2...3, Position shared with DPT
    TRANSLATEMODE_FIELD_POSITION    EQU 2
    TRANSLATEMODE_NORMAL            EQU 0   ; Must be zero
    TRANSLATEMODE_LARGE             EQU 1
    TRANSLATEMODE_ASSISTED_LBA      EQU 2   ; 28-bit or 48-bit LBA
    TRANSLATEMODE_AUTO              EQU 3   ; Only available in ROMVARS, not in DPTs
FLG_DRVPARAMS_BLOCKMODE         EQU (1<<4)  ; Enable Block mode transfers
FLG_DRVPARAMS_USERCHS           EQU (1<<5)  ; User specified P-CHS values
    MAX_USER_CYLINDERS              EQU 16383
    MAX_USER_HEADS                  EQU 16
    MAX_USER_SECTORS_PER_TRACK      EQU 63
    MAX_USER_CHS_COUNT              EQU (MAX_USER_CYLINDERS * MAX_USER_HEADS * MAX_USER_SECTORS_PER_TRACK)
FLG_DRVPARAMS_USERLBA           EQU (1<<6)  ; User specified LBA value
    MIN_USER_LBA_COUNT              EQU (MAX_USER_CHS_COUNT+1)  ; Must be more than max CHS
    MAX_USER_LBA_COUNT              EQU ((2^28)-1)              ; LBA28 limit

%endif ; ROMVARS_INC