video_subr.c File Reference

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

Go to the source code of this file.

Defines
#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
static char *	vidmem
static int	video_line
static int	video_col
struct console_driver vga_console	__console_driver

---

Define Documentation

#define VIDBUFFER   0xB8000

Definition at line 20 of file video_subr.c.

Referenced by video_init().

---

Function Documentation

static void memsetw	(	void *	s,
		int	c,
		unsigned int	n
	)			[static]

Definition at line 22 of file video_subr.c.

References u16.

Referenced by video_init().

{
        unsigned int i;
        u16 *ss = (u16 *) s;

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

static void video_init

(

void

)

[static]

Definition at line 32 of file video_subr.c.

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

{
        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;
        }
}

static void video_scroll

(

void

)

[static]

Definition at line 48 of file video_subr.c.

References COLS, LINES, memcpy, and vidmem.

Referenced by vga_putc().

{
        int i;

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

static void vga_putc

(

int

byte

)

[static]

Definition at line 57 of file video_subr.c.

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

{
        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);
}

struct init_fn video_init_fn __init_fn

(

INIT_EARLY

)

[read]

---

Variable Documentation

struct console_driver vga_console

Definition at line 15 of file video_subr.c.

char* vidmem [static]

Definition at line 17 of file video_subr.c.

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

int video_line [static]

Definition at line 18 of file video_subr.c.

Referenced by vga_putc(), and video_init().

int video_col [static]

Definition at line 18 of file video_subr.c.

Referenced by vga_putc(), and video_init().

struct console_driver vga_console __console_driver

Initial value:

 {
        .putchar = vga_putc,
        .disabled = 1,
}

Definition at line 97 of file video_subr.c.