173 lines
4.1 KiB
C
173 lines
4.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007, 2008, 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/i386/vga_common.h>
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#include <grub/i386/io.h>
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#include <grub/types.h>
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#include <grub/vga.h>
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#define COLS 80
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#define ROWS 25
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static int grub_curr_x, grub_curr_y;
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#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb8000)
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static void
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screen_write_char (int x, int y, short c)
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{
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VGA_TEXT_SCREEN[y * COLS + x] = c;
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}
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static short
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screen_read_char (int x, int y)
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{
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return VGA_TEXT_SCREEN[y * COLS + x];
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}
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static void
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update_cursor (void)
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{
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unsigned int pos = grub_curr_y * COLS + grub_curr_x;
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grub_vga_cr_write (pos >> 8, GRUB_VGA_CR_CURSOR_ADDR_HIGH);
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grub_vga_cr_write (pos & 0xFF, GRUB_VGA_CR_CURSOR_ADDR_LOW);
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}
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static void
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inc_y (void)
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{
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grub_curr_x = 0;
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if (grub_curr_y < ROWS - 1)
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grub_curr_y++;
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else
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{
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int x, y;
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for (y = 0; y < ROWS - 1; y++)
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for (x = 0; x < COLS; x++)
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screen_write_char (x, y, screen_read_char (x, y + 1));
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for (x = 0; x < COLS; x++)
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screen_write_char (x, ROWS - 1, ' ' | (grub_console_cur_color << 8));
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}
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}
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static void
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inc_x (void)
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{
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if (grub_curr_x >= COLS - 1)
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inc_y ();
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else
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grub_curr_x++;
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}
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static void
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grub_vga_text_putchar (struct grub_term_output *term __attribute__ ((unused)),
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const struct grub_unicode_glyph *c)
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{
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switch (c->base)
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{
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case '\b':
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if (grub_curr_x != 0)
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screen_write_char (grub_curr_x--, grub_curr_y, ' ');
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break;
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case '\n':
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inc_y ();
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break;
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case '\r':
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grub_curr_x = 0;
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break;
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default:
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screen_write_char (grub_curr_x, grub_curr_y,
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c->base | (grub_console_cur_color << 8));
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inc_x ();
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}
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update_cursor ();
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}
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static grub_uint16_t
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grub_vga_text_getxy (struct grub_term_output *term __attribute__ ((unused)))
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{
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return (grub_curr_x << 8) | grub_curr_y;
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}
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static void
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grub_vga_text_gotoxy (struct grub_term_output *term __attribute__ ((unused)),
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grub_uint8_t x, grub_uint8_t y)
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{
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grub_curr_x = x;
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grub_curr_y = y;
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update_cursor ();
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}
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static void
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grub_vga_text_cls (struct grub_term_output *term)
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{
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int i;
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for (i = 0; i < ROWS * COLS; i++)
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VGA_TEXT_SCREEN[i] = ' ' | (grub_console_cur_color << 8);
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grub_vga_text_gotoxy (term, 0, 0);
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}
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static void
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grub_vga_text_setcursor (struct grub_term_output *term __attribute__ ((unused)),
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int on)
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{
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grub_uint8_t old;
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old = grub_vga_cr_read (GRUB_VGA_CR_CURSOR_START);
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if (on)
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grub_vga_cr_write (old & ~GRUB_VGA_CR_CURSOR_START_DISABLE,
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GRUB_VGA_CR_CURSOR_START);
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else
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grub_vga_cr_write (old | GRUB_VGA_CR_CURSOR_START_DISABLE,
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GRUB_VGA_CR_CURSOR_START);
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}
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static grub_err_t
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grub_vga_text_init_fini (struct grub_term_output *term)
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{
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grub_vga_text_cls (term);
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return 0;
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}
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static struct grub_term_output grub_vga_text_term =
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{
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.name = "vga_text",
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.init = grub_vga_text_init_fini,
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.fini = grub_vga_text_init_fini,
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.putchar = grub_vga_text_putchar,
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.getwh = grub_console_getwh,
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.getxy = grub_vga_text_getxy,
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.gotoxy = grub_vga_text_gotoxy,
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.cls = grub_vga_text_cls,
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.setcolorstate = grub_console_setcolorstate,
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.setcursor = grub_vga_text_setcursor,
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.flags = GRUB_TERM_CODE_TYPE_CP437,
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.normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
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.highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
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};
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GRUB_MOD_INIT(vga_text)
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{
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grub_term_register_output ("vga_text", &grub_vga_text_term);
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}
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GRUB_MOD_FINI(vga_text)
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{
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grub_term_unregister_output (&grub_vga_text_term);
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}
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