/* * 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 };