2 * This file is part of the libpayload project.
4 * Copyright (C) 2008 Advanced Micro Devices, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <libpayload.h>
31 #include <video_console.h>
33 #define VGA_COLOR_WHITE 7
35 #define CRTC_INDEX 0x3d4
36 #define CRTC_DATA 0x3d5
38 #define VIDEO(_r, _c)\
39 ((u16 *) (phys_to_virt(0xB8000) + ((_r) * (VIDEO_COLS * 2)) + ((_c) * 2)))
41 static u8 crtc_read(u8 index)
43 outb(index, CRTC_INDEX);
44 return inb(CRTC_DATA);
47 static void crtc_write(u8 data, u8 index)
49 outb(index, CRTC_INDEX);
50 outb(data, CRTC_DATA);
53 static void vga_get_cursor(unsigned int *x, unsigned int *y, unsigned int *en)
56 addr = ((unsigned int) crtc_read(0x0E)) << 8;
57 addr += crtc_read(0x0F);
59 *x = addr % VIDEO_COLS;
60 *y = addr / VIDEO_COLS;
62 *en = !(crtc_read(0x0A) & (1 << 5));
65 static void vga_set_cursor(unsigned int x, unsigned int y)
69 addr = x + (VIDEO_COLS * y);
70 crtc_write(addr >> 8, 0x0E);
71 crtc_write(addr, 0x0F);
74 static void vga_enable_cursor(int state)
76 unsigned char tmp = crtc_read(0x0a);
84 crtc_write(tmp, 0x0a);
87 static void vga_clear_line(u8 row, u8 ch, u8 attr)
90 u16 *ptr = VIDEO(row, 0);
92 for(col = 0; col < VIDEO_COLS; col++)
93 ptr[col] = ((attr & 0xFF) << 8) | (ch & 0xFF);
96 static void vga_scroll_up(void)
98 u16 *src = VIDEO(1,0);
99 u16 *dst = VIDEO(0,0);
102 for(i = 0; i < (VIDEO_ROWS - 1) * VIDEO_COLS; i++)
105 vga_clear_line(VIDEO_ROWS - 1, ' ', VGA_COLOR_WHITE);
108 static void vga_fill(u8 ch, u8 attr)
111 for(row = 0; row < VIDEO_ROWS; row++)
112 vga_clear_line(row, ch, attr);
115 static void vga_clear(void)
117 vga_fill(' ', VGA_COLOR_WHITE);
120 static void vga_putc(u8 row, u8 col, unsigned int c)
122 u16 *ptr = VIDEO(row, col);
123 *ptr = (u16) (c & 0xFFFF);
126 static void vga_init_cursor(void)
130 #define CURSOR_MSL 0x09 /* cursor maximum scan line */
131 #define CURSOR_START 0x0A /* cursor start */
132 #define CURSOR_END 0x0B /* cursor end */
134 val = crtc_read(CURSOR_MSL) & 0x1f;
135 crtc_write(0, CURSOR_START);
136 crtc_write(val - 2, CURSOR_END);
139 static int vga_init(void)
145 struct video_console vga_video_console = {
149 .scroll_up = vga_scroll_up,
151 .get_cursor = vga_get_cursor,
152 .set_cursor = vga_set_cursor,
153 .enable_cursor = vga_enable_cursor,