#include <freeldr.h>

Include dependency graph for pc98cons.c:

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;
 }