source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectPrint.asm

; Project name  :   XTIDE Universal BIOS
; Description   :   Functions for printing drive detection strings.

;
; 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
;

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; DetectPrint_InitializeDisplayContext
;   Parameters:
;       Nothing
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, DI
;--------------------------------------------------------------------
DetectPrint_InitializeDisplayContext:
    JMP_DISPLAY_LIBRARY InitializeDisplayContext


;--------------------------------------------------------------------
; DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP
;   Parameters:
;       CS:CX:  Ptr to "Master" or "Slave" string
;       CS:BP:  Ptr to IDEVARS
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, CX, DX, SI, DI
;--------------------------------------------------------------------
DetectPrint_StartDetectWithMasterOrSlaveStringInCXandIdeVarsInCSBP:
    mov     ax, [cs:bp+IDEVARS.wBasePort]   ; For IDE: AX=port address, DH=.bDevice
    ; Fall to DetectPrint_StartDetectWithAutodetectedBasePortInAXandIdeVarsInCSBP

;--------------------------------------------------------------------
; DetectPrint_StartDetectWithAutodetectedBasePortInAXandIdeVarsInCSBP
;   Parameters:
;       AX:     Base Port Address
;       CS:CX:  Ptr to "Master" or "Slave" string
;       CS:BP:  Ptr to IDEVARS
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, CX, DX, SI, DI
;--------------------------------------------------------------------
DetectPrint_StartDetectWithAutodetectedBasePortInAXandIdeVarsInCSBP:
    mov     dx, [cs:bp+IDEVARS.bDevice-1]   ; For Serial: AL=port address>>2, AH=baud rate
                                            ;             DL=COM number character, DH=.bDevice
    push    bp                              ; Setup stack for call to
    mov     bp, sp                          ; BootMenuPrint_FormatCSSIfromParamsInSSBP

    push    cx                              ; Push "Master" or "Slave"

    mov     cl, (g_szDetectPort-$$) & 0xff  ; Setup print string for standard IDE
                                            ; Note that we modify only the low order bits of CX a lot here,
                                            ; saving code space rather than reloading CX completely.
                                            ; This optimization requires that all the g_szDetect* strings are
                                            ; on the same 256 byte page, which is checked in strings.asm.

%ifdef MODULE_SERIAL
    cmp     dh, DEVICE_SERIAL_PORT          ; Check if this is a serial device
    jne     SHORT .pushAndPrint             ; CX = string to print, AX = port address, DX won't be used

    mov     cl, (g_szDetectCOM-$$) & 0xff   ; Setup print string for COM ports
    push    cx                              ; And push now.  We use the fact that format strings can contain
                                            ; themselves format strings.

    push    dx                              ; Push COM number character
                                            ; If the string is going to be "Auto", we will push a NULL (zero)
                                            ; here for the COM port number, which will be eaten by the
                                            ; print routine (DisplayPrint_CharacterFromAL), resulting in
                                            ; just "COM" being printed without a character after it.

    mov     cl, (g_szDetectCOMAuto-$$) & 0xff   ; Setup secondary print string for "Auto"

    test    dl, dl                          ; Check if serial port "Auto"
    jz      SHORT .pushAndPrintSerial       ; CX = string to print, AX and DX won't be used

    mov     cl, (g_szDetectCOMLarge-$$) & 0xff  ; Setup secondary print string for "COMn/xx.yK"

    mov     al, ah                          ; baud rate divisor to AL
    cbw                                     ; clear AH, AL will always be less than 128
    xchg    si, ax                          ; move AX to SI for divide
    mov     ax, 1152                        ; baud rate to display is 115200/divisor, the "00" is handled
                                            ; in the print strings
    cwd                                     ; clear top 16-bits of dividend
    div     si                              ; and divide...  Now AX = baud rate/100, DX = 0 (always a clean divide)

    mov     si, 10                          ; Now separate the whole portion from the fractional for "K" display
    div     si                              ; and divide...  Now AX = baud rate/1000, DX = low order digit

    cmp     ax, si                          ; < 10: "2400", "9600", etc.; >= 10: "19.2K", "38.4K", etc.
    jae     SHORT .pushAndPrintSerial

    mov     cl, (g_szDetectCOMSmall-$$) & 0xff  ; Setup secondary print string for "COMn/XXy00"

.pushAndPrintSerial:
.pushAndPrint:
%endif

    push    cx                              ; Push print string
    push    ax                              ; Push high order digits, or port address, or N/A
    push    dx                              ; Push low order digit, or N/A

    mov     si, g_szDetectOuter             ; Load SI with default wrapper string "IDE %s at %s: "

    jmp     SHORT DetectPrint_FormatCSSIfromParamsInSSBP


;--------------------------------------------------------------------
; DetectPrint_DriveNameFromDrvDetectInfoInESBX
;   Parameters:
;       ES:BX:  Ptr to DRVDETECTINFO (if drive found)
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, SI, DI
;--------------------------------------------------------------------
DetectPrint_DriveNameFromDrvDetectInfoInESBX:
    push    bp
    mov     bp, sp
%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
%if DRVDETECTINFO.szDrvName = 0
    push    bx
%else
    lea     si, [bx+DRVDETECTINFO.szDrvName]
    push    si
%endif
%endif
    mov     si, g_szDriveName
    jmp     SHORT DetectPrint_FormatCSSIfromParamsInSSBP


;--------------------------------------------------------------------
; Prints BIOS name and segment address where it is found.
;
; DetectPrint_RomFoundAtSegment
;   Parameters:
;       Nothing
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, SI, DI
;--------------------------------------------------------------------
DetectPrint_RomFoundAtSegment:
    mov     si, g_szRomAt
    mov     di, cs                      ; BIOS segment address, for later inclusion in the output, parameterized
                                        ; so that it can be a different value when using .BootMenuEntry

.BootMenuEntry:
    push    bp
    mov     bp, sp

%ifndef USE_186
    mov     ax, ROMVARS.szTitle
    push    ax
    push    di                          ; BIOS segment
    mov     al, ROMVARS.szVersion & 0FFh
    push    ax
%else
    ; szTitle and szVersion have the high order byte of their addresses zero,
    ; so these push instructions are only 2 bytes
    ;
    push    ROMVARS.szTitle
    push    di                          ; BIOS segment
    push    ROMVARS.szVersion
%endif

    jmp     SHORT DetectPrint_FormatCSSIfromParamsInSSBP


;--------------------------------------------------------------------
; DetectPrint_FailedToLoadFirstSector
;   Parameters:
;       AH:     INT 13h error code
;   Returns:
;       CF:     Set
;   Corrupts registers:
;       AX, CX, SI, DI
;--------------------------------------------------------------------
DetectPrint_FailedToLoadFirstSector:
    push    bp
    mov     bp, sp
    eMOVZX  cx, ah
    push    cx                  ; Push INT 13h error code
    mov     si, g_szReadError
    jmp     SHORT DetectPrint_FormatCSSIfromParamsInSSBP    ; Sets CF


;--------------------------------------------------------------------
; DetectPrint_TryToBootFromDL
;   Parameters:
;       DL:     Drive to boot from (translated, 00h or 80h)
;       DS:     RAMVARS segment
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, DH, SI, DI
;--------------------------------------------------------------------
DetectPrint_TryToBootFromDL:
    push    bp
    mov     bp, sp

%ifdef MODULE_DRIVEXLATE

    call    DriveXlate_ToOrBack ; DL = Untranslated Drive number
    mov     dh, dl
    call    DriveXlate_ToOrBack ; DL = Translated Drive number

    call    DriveXlate_ConvertDriveNumberFromDLtoDriveLetter    ; DL = Translated letter
    xchg    dl, dh
    call    DriveXlate_ConvertDriveNumberFromDLtoDriveLetter    ; DL = Untranslated letter
    push    dx
    xchg    dl, dh
    push    dx

    call    DriveXlate_ConvertDriveLetterInDLtoDriveNumber  ; Restore DL

%else
    ePUSH_T ax, ' '         ; No drive translation so print space

    ; Get boot drive letters
    call    BootVars_GetLetterForFirstHardDriveToAX
    test    dl, dl
    eCMOVNS al, DEFAULT_FLOPPY_DRIVE_LETTER
    push    ax

%endif ; MODULE_DRIVEXLATE

    mov     si, g_szTryToBoot
    jmp     SHORT DetectPrint_FormatCSSIfromParamsInSSBP


;--------------------------------------------------------------------
; DetectPrint_NullTerminatedStringFromCSSI
; DetectPrint_NullTerminatedStringFromCSSIandSetCF
;   Parameters:
;       CS:SI:  Ptr to NULL terminated string to print
;   Returns:
;       CF:     Set since menu event was handled successfully
;   Corrupts registers:
;       AX, DI
;--------------------------------------------------------------------
DetectPrint_NullTerminatedStringFromCSSI:
DetectPrint_NullTerminatedStringFromCSSIandSetCF:
;
; We send all CSSI strings through the Format routine for the case of
; compressed strings, but this doesn't hurt in the non-compressed case either
; (perhaps a little slower, but shouldn't be noticeable to the user)
; and results in smaller code size.
;
    push    bp
    mov     bp, sp
    ; Fall to DetectPrint_FormatCSSIfromParamsInSSBP

;--------------------------------------------------------------------
; DetectPrint_FormatCSSIfromParamsInSSBP
;   Parameters:
;       CS:SI:  Ptr to string to format
;       BP:     SP before pushing parameters
;   Returns:
;       BP:     Popped from stack
;       CF:     Set since menu event was handled successfully
;   Corrupts registers:
;       AX, DI
;--------------------------------------------------------------------
DetectPrint_FormatCSSIfromParamsInSSBP:
    CALL_DISPLAY_LIBRARY FormatNullTerminatedStringFromCSSI
    stc             ; Successful return from menu event
    pop     bp
    ret