diff options
Diffstat (limited to 'grub-core/term/i386/pc/vga_text.c')
| -rw-r--r-- | grub-core/term/i386/pc/vga_text.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/grub-core/term/i386/pc/vga_text.c b/grub-core/term/i386/pc/vga_text.c new file mode 100644 index 0000000..1816bfa --- /dev/null +++ b/grub-core/term/i386/pc/vga_text.c @@ -0,0 +1,175 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2007, 2008, 2010 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/dl.h> +#include <grub/i386/vga_common.h> +#include <grub/i386/io.h> +#include <grub/types.h> +#include <grub/vga.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define COLS 80 +#define ROWS 25 + +static int grub_curr_x, grub_curr_y; + +#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb8000) + +static void +screen_write_char (int x, int y, short c) +{ + VGA_TEXT_SCREEN[y * COLS + x] = c; +} + +static short +screen_read_char (int x, int y) +{ + return VGA_TEXT_SCREEN[y * COLS + x]; +} + +static void +update_cursor (void) +{ + unsigned int pos = grub_curr_y * COLS + grub_curr_x; + grub_vga_cr_write (pos >> 8, GRUB_VGA_CR_CURSOR_ADDR_HIGH); + grub_vga_cr_write (pos & 0xFF, GRUB_VGA_CR_CURSOR_ADDR_LOW); +} + +static void +inc_y (void) +{ + grub_curr_x = 0; + if (grub_curr_y < ROWS - 1) + grub_curr_y++; + else + { + int x, y; + for (y = 0; y < ROWS - 1; y++) + for (x = 0; x < COLS; x++) + screen_write_char (x, y, screen_read_char (x, y + 1)); + for (x = 0; x < COLS; x++) + screen_write_char (x, ROWS - 1, ' ' | (grub_console_cur_color << 8)); + } +} + +static void +inc_x (void) +{ + if (grub_curr_x >= COLS - 1) + inc_y (); + else + grub_curr_x++; +} + +static void +grub_vga_text_putchar (struct grub_term_output *term __attribute__ ((unused)), + const struct grub_unicode_glyph *c) +{ + switch (c->base) + { + case '\b': + if (grub_curr_x != 0) + screen_write_char (grub_curr_x--, grub_curr_y, ' '); + break; + case '\n': + inc_y (); + break; + case '\r': + grub_curr_x = 0; + break; + default: + screen_write_char (grub_curr_x, grub_curr_y, + c->base | (grub_console_cur_color << 8)); + inc_x (); + } + + update_cursor (); +} + +static grub_uint16_t +grub_vga_text_getxy (struct grub_term_output *term __attribute__ ((unused))) +{ + return (grub_curr_x << 8) | grub_curr_y; +} + +static void +grub_vga_text_gotoxy (struct grub_term_output *term __attribute__ ((unused)), + grub_uint8_t x, grub_uint8_t y) +{ + grub_curr_x = x; + grub_curr_y = y; + update_cursor (); +} + +static void +grub_vga_text_cls (struct grub_term_output *term) +{ + int i; + for (i = 0; i < ROWS * COLS; i++) + VGA_TEXT_SCREEN[i] = ' ' | (grub_console_cur_color << 8); + grub_vga_text_gotoxy (term, 0, 0); +} + +static void +grub_vga_text_setcursor (struct grub_term_output *term __attribute__ ((unused)), + int on) +{ + grub_uint8_t old; + old = grub_vga_cr_read (GRUB_VGA_CR_CURSOR_START); + if (on) + grub_vga_cr_write (old & ~GRUB_VGA_CR_CURSOR_START_DISABLE, + GRUB_VGA_CR_CURSOR_START); + else + grub_vga_cr_write (old | GRUB_VGA_CR_CURSOR_START_DISABLE, + GRUB_VGA_CR_CURSOR_START); +} + +static grub_err_t +grub_vga_text_init_fini (struct grub_term_output *term) +{ + grub_vga_text_cls (term); + return 0; +} + +static struct grub_term_output grub_vga_text_term = + { + .name = "vga_text", + .init = grub_vga_text_init_fini, + .fini = grub_vga_text_init_fini, + .putchar = grub_vga_text_putchar, + .getwh = grub_console_getwh, + .getxy = grub_vga_text_getxy, + .gotoxy = grub_vga_text_gotoxy, + .cls = grub_vga_text_cls, + .setcolorstate = grub_console_setcolorstate, + .setcursor = grub_vga_text_setcursor, + .flags = GRUB_TERM_CODE_TYPE_CP437, + .normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR, + .highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR, + }; + +GRUB_MOD_INIT(vga_text) +{ + grub_term_register_output ("vga_text", &grub_vga_text_term); +} + +GRUB_MOD_FINI(vga_text) +{ + grub_term_unregister_output (&grub_vga_text_term); +} |