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Diffstat (limited to '')
-rw-r--r-- | grub-core/term/i386/pc/vga_text.c | 288 |
1 files changed, 288 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..88fecc5 --- /dev/null +++ b/grub-core/term/i386/pc/vga_text.c @@ -0,0 +1,288 @@ +/* + * 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/cpu/io.h> +#include <grub/types.h> +#include <grub/vga.h> +#include <grub/term.h> + +#if defined (GRUB_MACHINE_COREBOOT) +#include <grub/machine/console.h> +#endif + +/* MODESET is used for testing to force monochrome or colour mode. + You shouldn't use mda_text on vga. + */ +#ifdef MODESET +#include <grub/machine/int.h> +#endif + +#if defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU) || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) || defined (GRUB_MACHINE_MULTIBOOT) +#include <grub/machine/console.h> +#endif + +GRUB_MOD_LICENSE ("GPLv3+"); + +#define COLS 80 +#define ROWS 25 + +static struct grub_term_coordinate grub_curr_pos; + +#ifdef __mips__ +#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb00b8000) +#define cr_read grub_vga_cr_read +#define cr_write grub_vga_cr_write +#elif defined (MODE_MDA) +#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb0000) +#define cr_read grub_vga_cr_bw_read +#define cr_write grub_vga_cr_bw_write +#else +#define VGA_TEXT_SCREEN ((grub_uint16_t *) 0xb8000) +#define cr_read grub_vga_cr_read +#define cr_write grub_vga_cr_write +#endif + +static grub_uint8_t cur_color = 0x7; + +static void +screen_write_char (int x, int y, short c) +{ + VGA_TEXT_SCREEN[y * COLS + x] = grub_cpu_to_le16 (c); +} + +static short +screen_read_char (int x, int y) +{ + return grub_le_to_cpu16 (VGA_TEXT_SCREEN[y * COLS + x]); +} + +static void +update_cursor (void) +{ + unsigned int pos = grub_curr_pos.y * COLS + grub_curr_pos.x; + cr_write (pos >> 8, GRUB_VGA_CR_CURSOR_ADDR_HIGH); + cr_write (pos & 0xFF, GRUB_VGA_CR_CURSOR_ADDR_LOW); +} + +static void +inc_y (void) +{ + grub_curr_pos.x = 0; + if (grub_curr_pos.y < ROWS - 1) + grub_curr_pos.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, ' ' | (cur_color << 8)); + } +} + +static void +inc_x (void) +{ + if (grub_curr_pos.x >= COLS - 1) + inc_y (); + else + grub_curr_pos.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_pos.x != 0) + screen_write_char (grub_curr_pos.x--, grub_curr_pos.y, ' '); + break; + case '\n': + inc_y (); + break; + case '\r': + grub_curr_pos.x = 0; + break; + default: + screen_write_char (grub_curr_pos.x, grub_curr_pos.y, + c->base | (cur_color << 8)); + inc_x (); + } + + update_cursor (); +} + +static struct grub_term_coordinate +grub_vga_text_getxy (struct grub_term_output *term __attribute__ ((unused))) +{ + return grub_curr_pos; +} + +static void +grub_vga_text_gotoxy (struct grub_term_output *term __attribute__ ((unused)), + struct grub_term_coordinate pos) +{ + grub_curr_pos = pos; + 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_cpu_to_le16 (' ' | (cur_color << 8)); + grub_vga_text_gotoxy (term, (struct grub_term_coordinate) { 0, 0 }); +} + +static void +grub_vga_text_setcursor (struct grub_term_output *term __attribute__ ((unused)), + int on) +{ + grub_uint8_t old; + old = cr_read (GRUB_VGA_CR_CURSOR_START); + if (on) + cr_write (old & ~GRUB_VGA_CR_CURSOR_START_DISABLE, + GRUB_VGA_CR_CURSOR_START); + else + cr_write (old | GRUB_VGA_CR_CURSOR_START_DISABLE, + GRUB_VGA_CR_CURSOR_START); +} + +static grub_err_t +grub_vga_text_init_real (struct grub_term_output *term) +{ +#ifdef MODESET + struct grub_bios_int_registers regs; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + +#ifdef MODE_MDA + regs.eax = 7; +#else + regs.eax = 3; +#endif + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); +#endif + grub_vga_text_cls (term); + return 0; +} + +static grub_err_t +grub_vga_text_fini_real (struct grub_term_output *term) +{ +#ifdef MODESET + struct grub_bios_int_registers regs; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + + regs.eax = 3; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); +#endif + grub_vga_text_cls (term); + return 0; +} + +static struct grub_term_coordinate +grub_vga_text_getwh (struct grub_term_output *term __attribute__ ((unused))) +{ + return (struct grub_term_coordinate) { 80, 25 }; +} + +#ifndef MODE_MDA + +static void +grub_vga_text_setcolorstate (struct grub_term_output *term __attribute__ ((unused)), + grub_term_color_state state) +{ + switch (state) { + case GRUB_TERM_COLOR_STANDARD: + cur_color = GRUB_TERM_DEFAULT_STANDARD_COLOR & 0x7f; + break; + case GRUB_TERM_COLOR_NORMAL: + cur_color = grub_term_normal_color & 0x7f; + break; + case GRUB_TERM_COLOR_HIGHLIGHT: + cur_color = grub_term_highlight_color & 0x7f; + break; + default: + break; + } +} + +#else +static void +grub_vga_text_setcolorstate (struct grub_term_output *term __attribute__ ((unused)), + grub_term_color_state state) +{ + switch (state) { + case GRUB_TERM_COLOR_STANDARD: + cur_color = 0x07; + break; + case GRUB_TERM_COLOR_NORMAL: + cur_color = 0x07; + break; + case GRUB_TERM_COLOR_HIGHLIGHT: + cur_color = 0x70; + break; + default: + break; + } +} +#endif + +static struct grub_term_output grub_vga_text_term = + { +#ifdef MODE_MDA + .name = "mda_text", +#else + .name = "vga_text", +#endif + .init = grub_vga_text_init_real, + .fini = grub_vga_text_fini_real, + .putchar = grub_vga_text_putchar, + .getwh = grub_vga_text_getwh, + .getxy = grub_vga_text_getxy, + .gotoxy = grub_vga_text_gotoxy, + .cls = grub_vga_text_cls, + .setcolorstate = grub_vga_text_setcolorstate, + .setcursor = grub_vga_text_setcursor, + .flags = GRUB_TERM_CODE_TYPE_CP437, + .progress_update_divisor = GRUB_PROGRESS_FAST + }; + +#ifndef MODE_MDA + +GRUB_MOD_INIT(vga_text) +{ +#ifdef GRUB_MACHINE_COREBOOT + if (!grub_video_coreboot_fbtable) +#endif + grub_term_register_output ("vga_text", &grub_vga_text_term); +} + +GRUB_MOD_FINI(vga_text) +{ + grub_term_unregister_output (&grub_vga_text_term); +} + +#endif |