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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <video_console.h>
struct video_console vga_video_console;
#define VGA_COLOR_WHITE 7
#define CRTC_INDEX 0x3d4
#define CRTC_DATA 0x3d5
#define VIDEO(_r, _c)\
((u16 *) (phys_to_virt(0xB8000) + ((_r) * (vga_video_console.columns * 2)) + ((_c) * 2)))
static u8 crtc_read(u8 index)
{
outb(index, CRTC_INDEX);
return inb(CRTC_DATA);
}
static void crtc_write(u8 data, u8 index)
{
outb(index, CRTC_INDEX);
outb(data, CRTC_DATA);
}
static void vga_get_cursor(unsigned int *x, unsigned int *y, unsigned int *en)
{
unsigned int addr;
addr = ((unsigned int) crtc_read(0x0E)) << 8;
addr += crtc_read(0x0F);
*x = addr % vga_video_console.columns;
*y = addr / vga_video_console.columns;
*en = !(crtc_read(0x0A) & (1 << 5));
}
static void vga_set_cursor(unsigned int x, unsigned int y)
{
unsigned int addr;
addr = x + (vga_video_console.columns * y);
crtc_write(addr >> 8, 0x0E);
crtc_write(addr, 0x0F);
}
static void vga_enable_cursor(int state)
{
unsigned char tmp = crtc_read(0x0a);
if (state == 0)
tmp |= (1 << 5);
else
tmp &= ~(1 << 5);
crtc_write(tmp, 0x0a);
}
static void vga_clear_line(u8 row, u8 ch, u8 attr)
{
int col;
u16 *ptr = VIDEO(row, 0);
for(col = 0; col < vga_video_console.columns; col++)
ptr[col] = ((attr & 0xFF) << 8) | (ch & 0xFF);
}
static void vga_scroll_up(void)
{
u16 *src = VIDEO(1,0);
u16 *dst = VIDEO(0,0);
int i;
for(i = 0; i < (vga_video_console.rows - 1) * vga_video_console.columns; i++)
*dst++ = *src++;
vga_clear_line(vga_video_console.rows - 1, ' ', VGA_COLOR_WHITE);
}
static void vga_fill(u8 ch, u8 attr)
{
u8 row;
for(row = 0; row < vga_video_console.rows; row++)
vga_clear_line(row, ch, attr);
}
static void vga_clear(void)
{
vga_fill(' ', VGA_COLOR_WHITE);
}
static void vga_putc(u8 row, u8 col, unsigned int c)
{
u16 *ptr = VIDEO(row, col);
*ptr = (u16) (c & 0xFFFF);
}
static void vga_init_cursor(void)
{
u8 val;
#define CURSOR_MSL 0x09 /* cursor maximum scan line */
#define CURSOR_START 0x0A /* cursor start */
#define CURSOR_END 0x0B /* cursor end */
val = crtc_read(CURSOR_MSL) & 0x1f;
crtc_write(0, CURSOR_START);
crtc_write(val - 2, CURSOR_END);
}
static int vga_init(void)
{
vga_init_cursor();
return 0;
}
struct video_console vga_video_console = {
.init = vga_init,
.putc = vga_putc,
.clear = vga_clear,
.scroll_up = vga_scroll_up,
.get_cursor = vga_get_cursor,
.set_cursor = vga_set_cursor,
.enable_cursor = vga_enable_cursor,
.columns = 80,
.rows = 25
};
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