pc98cons.c File Reference

#include <freeldr.h>

Include dependency graph for pc98cons.c:

Go to the source code of this file.

Macros
#define	TEXT_CHAR_SIZE   2

Functions
VOID	Pc98ConsPutChar (int Ch)
BOOLEAN	Pc98ConsKbHit (VOID)
int	Pc98ConsGetCh (VOID)

Variables
ULONG	VramText
UCHAR	TextCols
UCHAR	TextLines
static USHORT	CursorPosition = 0

Macro Definition Documentation

TEXT_CHAR_SIZE

#define TEXT_CHAR_SIZE   2

Definition at line 18 of file pc98cons.c.

Function Documentation

Pc98ConsGetCh()

int Pc98ConsGetCh

(

VOID

)

Definition at line 85 of file pc98cons.c.

{
    static BOOLEAN ExtendedKey = FALSE;
    static UCHAR ExtendedScanCode = 0;
    REGS Regs;
 
    /*
     * If the last time we were called an
     * extended key was pressed then return
     * that keys scan code.
     */
    if (ExtendedKey)
    {
        ExtendedKey = FALSE;
 
        return ExtendedScanCode;
    }
 
    /* Int 18h AH=00h
     * KEYBOARD - GET KEYSTROKE
     *
     * Return:
     * AH - BIOS scan code
     * AL - ASCII character
     */
    Regs.b.ah = 0x00;
    Int386(0x18, &Regs, &Regs);
 
    /* Check for an extended keystroke */
    if (Regs.b.al == 0)
    {
        ExtendedKey = TRUE;
        ExtendedScanCode = Regs.b.ah;
    }
 
    /* Return keystroke */
    return Regs.b.al;
}

Referenced by MachInit().

Pc98ConsKbHit()

BOOLEAN Pc98ConsKbHit

(

VOID

)

Definition at line 64 of file pc98cons.c.

{
    REGS Regs;
 
    /* Int 18h AH=01h
     * KEYBOARD - CHECK FOR KEYSTROKE
     *
     * Return:
     * BH - status
     *    00h - if no keystroke available
     *    01h - if keystroke available
     * AH - BIOS scan code
     * AL - ASCII character
     */
    Regs.b.ah = 0x01;
    Int386(0x18, &Regs, &Regs);
 
    return Regs.b.bh == 1;
}

Referenced by MachInit().

Pc98ConsPutChar()

VOID Pc98ConsPutChar

(

int

Ch

)

Definition at line 25 of file pc98cons.c.

{
    /* If scrolling is needed */
    if (CursorPosition >= TextCols * TextLines)
    {
        RtlCopyMemory((PUSHORT)VramText,
                      (PUSHORT)(VramText + TextCols * TEXT_CHAR_SIZE),
                      TextCols * TextLines * TEXT_CHAR_SIZE);
 
        CursorPosition -= TextCols;
    }
 
    if (Ch == '\n')
    {
        if (CursorPosition % TextCols != 0)
            CursorPosition += TextCols - (CursorPosition % TextCols);
 
        return;
    }
 
    if (Ch == '\t')
    {
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
        Pc98ConsPutChar(' ');
 
        return;
    }
 
    *(PUSHORT)(VramText + CursorPosition * TEXT_CHAR_SIZE) = Ch;
    ++CursorPosition;
}

Referenced by MachInit(), and Pc98ConsPutChar().

Variable Documentation

CursorPosition

USHORT CursorPosition = 0

static

Definition at line 20 of file pc98cons.c.

Referenced by ConDrvGetConsoleScreenBufferInfo(), InitializeDisplay(), Pc98ConsPutChar(), and Pc98VidSetCurrentMode().

TextCols

UCHAR TextCols

extern

Definition at line 21 of file pc98video.c.

Referenced by Pc98ConsPutChar(), Pc98VideoInit(), Pc98VideoSetTextCursorPosition(), and Pc98VideoTextRamPutChar().

TextLines

UCHAR TextLines

extern

Definition at line 22 of file pc98video.c.

Referenced by Pc98ConsPutChar(), and Pc98VideoInit().

VramText

ULONG VramText

extern

Definition at line 40 of file pc98video.c.

Referenced by Pc98ConsPutChar(), Pc98VideoClearScreen(), Pc98VideoGetFontsFromFirmware(), Pc98VideoInit(), Pc98VideoPrepareForReactOS(), and Pc98VideoTextRamPutChar().