vgacons.c File Reference

#include <stdbool.h>
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/kdebug.h>
#include <machine/amd64.h>
#include <machine/pmap.h>
#include "vgacons.h"

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Macros
#define	VGA_BASE   0x370
#define	VGA_ATC_INDEX   0x00 + VGA_BASE
#define	VGA_ATC_DATA   0x01 + VGA_BASE
#define	VGA_SEQ_INDEX   0x02 + VGA_BASE
#define	VGA_SEQ_DATA   0x05 + VGA_BASE
#define	VGA_PAL_RADDR   0x07 + VGA_BASE
#define	VGA_PAL_WADDR   0x08 + VGA_BASE
#define	VGA_PAL_DATA   0x09 + VGA_BASE
#define	VGA_GDC_INDEX   0x0E + VGA_BASE
#define	VGA_GDC_DATA   0x0F + VGA_BASE

Functions
void	LockDisplay (void)
void	UnlockDisplay (void)
void	EnterFontMode (void)
void	ExitFontMode (void)
void	VGA_Init (void)
void	VGA_LateInit (void)
void	VGA_ScrollDisplay (void)
void	VGA_Putc (short c)
void	VGA_Puts (const char *str)
void	Panic (const char *str)

Variables
static short *	VideoBuffer = (short *)(0x000B8000 + MEM_DIRECTMAP_BASE)
static int	CurrentX = 0
static int	CurrentY = 0
static int	SizeX = 80
static int	SizeY = 25
static unsigned char	TextAttribute = 0x70
static uint8_t	ModeBuffer [6]

Macro Definition Documentation

VGA_ATC_DATA

#define VGA_ATC_DATA   0x01 + VGA_BASE

Definition at line 26 of file vgacons.c.

VGA_ATC_INDEX

#define VGA_ATC_INDEX   0x00 + VGA_BASE

Definition at line 25 of file vgacons.c.

VGA_BASE

#define VGA_BASE   0x370

Definition at line 23 of file vgacons.c.

VGA_GDC_DATA

#define VGA_GDC_DATA   0x0F + VGA_BASE

Definition at line 33 of file vgacons.c.

VGA_GDC_INDEX

#define VGA_GDC_INDEX   0x0E + VGA_BASE

Definition at line 32 of file vgacons.c.

VGA_PAL_DATA

#define VGA_PAL_DATA   0x09 + VGA_BASE

Definition at line 31 of file vgacons.c.

VGA_PAL_RADDR

#define VGA_PAL_RADDR   0x07 + VGA_BASE

Definition at line 29 of file vgacons.c.

VGA_PAL_WADDR

#define VGA_PAL_WADDR   0x08 + VGA_BASE

Definition at line 30 of file vgacons.c.

VGA_SEQ_DATA

#define VGA_SEQ_DATA   0x05 + VGA_BASE

Definition at line 28 of file vgacons.c.

VGA_SEQ_INDEX

#define VGA_SEQ_INDEX   0x02 + VGA_BASE

Definition at line 27 of file vgacons.c.

Function Documentation

EnterFontMode()

void EnterFontMode

(

void

)

Definition at line 45 of file vgacons.c.

{
    // Save VGA State
    outb(VGA_SEQ_INDEX,0x02);
    ModeBuffer[0] = inb(VGA_SEQ_DATA);
 
    outb(VGA_SEQ_INDEX,0x04);
    ModeBuffer[1] = inb(VGA_SEQ_DATA);
 
    outb(VGA_GDC_INDEX,0x04);
    ModeBuffer[2] = inb(VGA_GDC_DATA);
 
    outb(VGA_GDC_INDEX,0x05);
    ModeBuffer[3] = inb(VGA_GDC_DATA);
 
    outb(VGA_GDC_INDEX,0x06);
    ModeBuffer[4] = inb(VGA_GDC_DATA);
 
    outb(VGA_ATC_INDEX,0x10);
    ModeBuffer[5] = inb(VGA_ATC_DATA);
 
    // Setup Font Mode
}

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ExitFontMode()

void ExitFontMode

(

void

)

Definition at line 69 of file vgacons.c.

{
    // Restore VGA State
}

LockDisplay()

void LockDisplay

(

void

)

Definition at line 37 of file vgacons.c.

{
}

Panic()

void Panic

(

const char *

str

)

Definition at line 164 of file vgacons.c.

{
    VGA_Puts(str);
    __asm__("int3");
    while (1)
    {
        __asm__("hlt");
    }
}

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UnlockDisplay()

void UnlockDisplay

(

void

)

Definition at line 41 of file vgacons.c.

{
}

VGA_Init()

void VGA_Init

(

void

)

Definition at line 75 of file vgacons.c.

{
    int i = 0;
 
    for (i = 0;i < SizeX * SizeY;i++)
    {
        VideoBuffer[i] = (TextAttribute << 8) | ' ';
    }
 
    CurrentX = 0;
    CurrentY = 0;
 
    /*
     * At initialization the video memory is located at 0xB8000.
     * We will map the memory after memory management has been
     * initialized.
     */
}

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VGA_LateInit()

void VGA_LateInit

(

void

)

Definition at line 94 of file vgacons.c.

{
    // Map in video memory
    // Set VideoBuffer pointer
}

VGA_Putc()

void VGA_Putc

(

short

c

)

Definition at line 115 of file vgacons.c.

{
    c |= (TextAttribute << 8);
    switch (c & 0xFF)
    {
        case '\b':
            if (CurrentX > 0) {
                CurrentX--;
                VideoBuffer[CurrentX + CurrentY * SizeX] = 0x20 | (TextAttribute << 8);
            }
            break;
        case '\n':
            if (CurrentY >= (SizeY - 1)) {
                VGA_ScrollDisplay();
            } else {
                CurrentY++;
            }
            CurrentX = 0;
            break;
        case '\r':
            break;
        case '\t':
            VGA_Putc(' ');
            VGA_Putc(' ');
            VGA_Putc(' ');
            VGA_Putc(' ');
            break;
        default:
            VideoBuffer[CurrentX + CurrentY * SizeX] = c;
            CurrentX++;
            if (CurrentX == SizeX)  {
                if (CurrentY >= (SizeY - 1)) {
                    VGA_ScrollDisplay();
                } else {
                    CurrentY++;
                }
                CurrentX = 0;
            }
            break;
    }
}

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VGA_Puts()

void VGA_Puts

(

const char *

str

)

Definition at line 157 of file vgacons.c.

{
    const char *p = str;
    while (*p != '\0')
        VGA_Putc(*p++);
}

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VGA_ScrollDisplay()

void VGA_ScrollDisplay

(

void

)

Definition at line 100 of file vgacons.c.

{
    int i,j;
    for (i = 1; i < SizeY; i++)
    {
        for (j = 0; j < SizeX; j++)
        {
            VideoBuffer[(i-1)*SizeX+j] = VideoBuffer[i*SizeX+j];
        }
    }
    for (j = 0; j < SizeX; j++)
        VideoBuffer[(SizeY-1)*SizeX+j] = (TextAttribute << 8) | ' ';
    return;
}

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Variable Documentation

CurrentX

int CurrentX = 0

static

Definition at line 17 of file vgacons.c.

CurrentY

int CurrentY = 0

static

Definition at line 18 of file vgacons.c.

ModeBuffer

uint8_t ModeBuffer[6]

static

Definition at line 35 of file vgacons.c.

SizeX

int SizeX = 80

static

Definition at line 19 of file vgacons.c.

SizeY

int SizeY = 25

static

Definition at line 20 of file vgacons.c.

TextAttribute

unsigned char TextAttribute = 0x70

static

Definition at line 21 of file vgacons.c.

VideoBuffer

short* VideoBuffer = (short *)(0x000B8000 + MEM_DIRECTMAP_BASE)

static

Definition at line 16 of file vgacons.c.