video_subr.c File Reference

#include "stddef.h"
#include "string.h"
#include <ipxe/io.h>
#include <ipxe/console.h>
#include <ipxe/init.h>
#include "vga.h"
#include <config/console.h>

Go to the source code of this file.

Macros
#define	CONSOLE_DIRECT_VGA   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#define	VIDBUFFER   0xB8000

Functions
static void	memsetw (void *s, int c, unsigned int n)
static void	video_init (void)
static void	video_scroll (void)
static void	vga_putc (int byte)
struct init_fn video_init_fn	__init_fn (INIT_EARLY)

Variables
struct console_driver vga_console	__console_driver
static char *	vidmem
static int	video_line
static int	video_col

Macro Definition Documentation

CONSOLE_DIRECT_VGA

#define CONSOLE_DIRECT_VGA   ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )

Definition at line 20 of file video_subr.c.

VIDBUFFER

#define VIDBUFFER   0xB8000

Definition at line 28 of file video_subr.c.

Referenced by video_init().

Function Documentation

memsetw()

void memsetw ( void * s, int c, unsigned int n )

static

Definition at line 30 of file video_subr.c.

{
        unsigned int i;
        u16 *ss = (u16 *) s;
 
        for (i = 0; i < n; i++) {
                ss[i] = ( u16 ) c;
        }
}

References ss, and u16.

Referenced by video_init().

video_init()

void video_init ( void )

static

Definition at line 40 of file video_subr.c.

{
        static int inited=0;
 
        vidmem = (char *)phys_to_virt(VIDBUFFER);
 
        if (!inited) {
                video_line = 0;
                video_col = 0;
        
                memsetw(vidmem, VGA_ATTR_CLR_WHT, 2*1024); //
 
                inited=1;
        }
}

References memsetw(), VGA_ATTR_CLR_WHT, VIDBUFFER, video_col, video_line, and vidmem.

Referenced by __init_fn().

video_scroll()

void video_scroll ( void )

static

Definition at line 56 of file video_subr.c.

{
        int i;
 
        memmove(vidmem, vidmem + COLS * 2, (LINES - 1) * COLS * 2);
        for (i = (LINES - 1) * COLS * 2; i < LINES * COLS * 2; i += 2)
                vidmem[i] = ' ';
}

References COLS, LINES, memmove(), and vidmem.

Referenced by vga_putc().

vga_putc()

void vga_putc ( int byte )

static

Definition at line 65 of file video_subr.c.

{
        if (byte == '\n') {
                video_line++;
                video_col = 0;
 
        } else if (byte == '\r') {
                video_col = 0;
 
        } else if (byte == '\b') {
                video_col--;
 
        } else if (byte == '\t') {
                video_col += 4;
 
        } else if (byte == '\a') {
                //beep
                //beep(500);
 
        } else {
                vidmem[((video_col + (video_line *COLS)) * 2)] = byte;
                vidmem[((video_col + (video_line *COLS)) * 2) +1] = VGA_ATTR_CLR_WHT;
                video_col++;
        }
        if (video_col < 0) {
                video_col = 0;
        }
        if (video_col >= COLS) {
                video_line++;
                video_col = 0;
        }
        if (video_line >= LINES) {
                video_scroll();
                video_line--;
        }
        // move the cursor
        write_crtc((video_col + (video_line *COLS)) >> 8, CRTC_CURSOR_HI);
        write_crtc((video_col + (video_line *COLS)) & 0x0ff, CRTC_CURSOR_LO);
}

References COLS, CRTC_CURSOR_HI, CRTC_CURSOR_LO, LINES, VGA_ATTR_CLR_WHT, video_col, video_line, video_scroll(), vidmem, and write_crtc.

__init_fn()

struct init_fn video_init_fn __init_fn

(

INIT_EARLY

)

References __init_fn, INIT_EARLY, and video_init().

Variable Documentation

__console_driver

struct console_driver vga_console __console_driver

Initial value:

= {
        .putchar = vga_putc,
        .disabled = CONSOLE_DISABLED,
        .usage = CONSOLE_DIRECT_VGA,
}

Definition at line 23 of file video_subr.c.

vidmem

char* vidmem

static

Definition at line 25 of file video_subr.c.

Referenced by vga_putc(), video_init(), and video_scroll().

video_line

int video_line

static

Definition at line 26 of file video_subr.c.

Referenced by vga_putc(), and video_init().

video_col

int video_col

static

Definition at line 26 of file video_subr.c.

Referenced by vga_putc(), and video_init().