| /* |
| * 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 |
| }; |