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