diff options
Diffstat (limited to 'grub-core/term/i386/pc/console.c')
| -rw-r--r-- | grub-core/term/i386/pc/console.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/grub-core/term/i386/pc/console.c b/grub-core/term/i386/pc/console.c new file mode 100644 index 0000000..f6142a2 --- /dev/null +++ b/grub-core/term/i386/pc/console.c @@ -0,0 +1,310 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2005,2007,2008,2009 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/machine/memory.h> +#include <grub/machine/console.h> +#include <grub/term.h> +#include <grub/types.h> +#include <grub/machine/int.h> + +static grub_uint8_t grub_console_cur_color = 0x7; + +static void +int10_9 (grub_uint8_t ch, grub_uint16_t n) +{ + struct grub_bios_int_registers regs; + + regs.eax = ch | 0x0900; + regs.ebx = grub_console_cur_color & 0xff; + regs.ecx = n; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); +} + +/* + * BIOS call "INT 10H Function 03h" to get cursor position + * Call with %ah = 0x03 + * %bh = page + * Returns %ch = starting scan line + * %cl = ending scan line + * %dh = row (0 is top) + * %dl = column (0 is left) + */ + + +static struct grub_term_coordinate +grub_console_getxy (struct grub_term_output *term __attribute__ ((unused))) +{ + struct grub_bios_int_registers regs; + + regs.eax = 0x0300; + regs.ebx = 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + + return (struct grub_term_coordinate) { + (regs.edx & 0xff), ((regs.edx & 0xff00) >> 8) }; +} + +/* + * BIOS call "INT 10H Function 02h" to set cursor position + * Call with %ah = 0x02 + * %bh = page + * %dh = row (0 is top) + * %dl = column (0 is left) + */ +static void +grub_console_gotoxy (struct grub_term_output *term __attribute__ ((unused)), + struct grub_term_coordinate pos) +{ + struct grub_bios_int_registers regs; + + /* set page to 0 */ + regs.ebx = 0; + regs.eax = 0x0200; + regs.edx = (pos.y << 8) | pos.x; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); +} + +/* + * + * Put the character C on the console. Because GRUB wants to write a + * character with an attribute, this implementation is a bit tricky. + * If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh + * (TELETYPE OUTPUT). Otherwise, use INT 10, AH = 9 to write character + * with attributes and advance cursor. If we are on the last column, + * let BIOS to wrap line correctly. + */ +static void +grub_console_putchar_real (grub_uint8_t c) +{ + struct grub_bios_int_registers regs; + struct grub_term_coordinate pos; + + if (c == 7 || c == 8 || c == 0xa || c == 0xd) + { + regs.eax = c | 0x0e00; + regs.ebx = 0x0001; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + return; + } + + /* get the current position */ + pos = grub_console_getxy (NULL); + + /* write the character with the attribute */ + int10_9 (c, 1); + + /* check the column with the width */ + if (pos.x >= 79) + { + grub_console_putchar_real (0x0d); + grub_console_putchar_real (0x0a); + } + else + grub_console_gotoxy (NULL, (struct grub_term_coordinate) { pos.x + 1, + pos.y }); +} + +static void +grub_console_putchar (struct grub_term_output *term __attribute__ ((unused)), + const struct grub_unicode_glyph *c) +{ + grub_console_putchar_real (c->base); +} + +/* + * BIOS call "INT 10H Function 09h" to write character and attribute + * Call with %ah = 0x09 + * %al = (character) + * %bh = (page number) + * %bl = (attribute) + * %cx = (number of times) + */ +static void +grub_console_cls (struct grub_term_output *term) +{ + /* move the cursor to the beginning */ + grub_console_gotoxy (term, (struct grub_term_coordinate) { 0, 0 }); + + /* write spaces to the entire screen */ + int10_9 (' ', 80 * 25); + + /* move back the cursor */ + grub_console_gotoxy (term, (struct grub_term_coordinate) { 0, 0 }); +} + +/* + * void grub_console_setcursor (int on) + * BIOS call "INT 10H Function 01h" to set cursor type + * Call with %ah = 0x01 + * %ch = cursor starting scanline + * %cl = cursor ending scanline + */ +static void +grub_console_setcursor (struct grub_term_output *term __attribute__ ((unused)), + int on) +{ + static grub_uint16_t console_cursor_shape = 0; + struct grub_bios_int_registers regs; + + /* check if the standard cursor shape has already been saved */ + if (!console_cursor_shape) + { + regs.eax = 0x0300; + regs.ebx = 0; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); + console_cursor_shape = regs.ecx; + if ((console_cursor_shape >> 8) >= (console_cursor_shape & 0xff)) + console_cursor_shape = 0x0d0e; + } + /* set %cx to the designated cursor shape */ + regs.ecx = on ? console_cursor_shape : 0x2000; + regs.eax = 0x0100; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x10, ®s); +} + +/* + * if there is a character pending, return it; otherwise return -1 + * BIOS call "INT 16H Function 01H" to check whether a character is pending + * Call with %ah = 0x1 + * Return: + * If key waiting to be input: + * %ah = keyboard scan code + * %al = ASCII character + * Zero flag = clear + * else + * Zero flag = set + * BIOS call "INT 16H Function 00H" to read character from keyboard + * Call with %ah = 0x0 + * Return: %ah = keyboard scan code + * %al = ASCII character + */ + +static int +grub_console_getkey (struct grub_term_input *term __attribute__ ((unused))) +{ + const grub_uint16_t bypass_table[] = { + 0x0100 | GRUB_TERM_ESC, 0x0f00 | GRUB_TERM_TAB, 0x0e00 | GRUB_TERM_BACKSPACE, 0x1c00 | '\r', 0x1c00 | '\n' + }; + struct grub_bios_int_registers regs; + unsigned i; + + /* + * Due to a bug in apple's bootcamp implementation, INT 16/AH = 0 would + * cause the machine to hang at the second keystroke. However, we can + * work around this problem by ensuring the presence of keystroke with + * INT 16/AH = 1 before calling INT 16/AH = 0. + */ + + regs.eax = 0x0100; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x16, ®s); + if (regs.flags & GRUB_CPU_INT_FLAGS_ZERO) + return GRUB_TERM_NO_KEY; + + regs.eax = 0x0000; + regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT; + grub_bios_interrupt (0x16, ®s); + if (!(regs.eax & 0xff)) + return ((regs.eax >> 8) & 0xff) | GRUB_TERM_EXTENDED; + + if ((regs.eax & 0xff) >= ' ') + return regs.eax & 0xff; + + for (i = 0; i < ARRAY_SIZE (bypass_table); i++) + if (bypass_table[i] == (regs.eax & 0xffff)) + return regs.eax & 0xff; + + return (regs.eax & 0xff) + (('a' - 1) | GRUB_TERM_CTRL); +} + +static const struct grub_machine_bios_data_area *bios_data_area = + (struct grub_machine_bios_data_area *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR; + +static int +grub_console_getkeystatus (struct grub_term_input *term __attribute__ ((unused))) +{ + /* conveniently GRUB keystatus is modelled after BIOS one. */ + return bios_data_area->keyboard_flag_lower & ~0x80; +} + +static struct grub_term_coordinate +grub_console_getwh (struct grub_term_output *term __attribute__ ((unused))) +{ + return (struct grub_term_coordinate) { 80, 25 }; +} + +static void +grub_console_setcolorstate (struct grub_term_output *term + __attribute__ ((unused)), + grub_term_color_state state) +{ + switch (state) { + case GRUB_TERM_COLOR_STANDARD: + grub_console_cur_color = GRUB_TERM_DEFAULT_STANDARD_COLOR & 0x7f; + break; + case GRUB_TERM_COLOR_NORMAL: + grub_console_cur_color = grub_term_normal_color & 0x7f; + break; + case GRUB_TERM_COLOR_HIGHLIGHT: + grub_console_cur_color = grub_term_highlight_color & 0x7f; + break; + default: + break; + } +} + +static struct grub_term_input grub_console_term_input = + { + .name = "console", + .getkey = grub_console_getkey, + .getkeystatus = grub_console_getkeystatus + }; + +static struct grub_term_output grub_console_term_output = + { + .name = "console", + .putchar = grub_console_putchar, + .getwh = grub_console_getwh, + .getxy = grub_console_getxy, + .gotoxy = grub_console_gotoxy, + .cls = grub_console_cls, + .setcolorstate = grub_console_setcolorstate, + .setcursor = grub_console_setcursor, + .flags = GRUB_TERM_CODE_TYPE_CP437, + .progress_update_divisor = GRUB_PROGRESS_FAST + }; + +void +grub_console_init (void) +{ + grub_term_register_output ("console", &grub_console_term_output); + grub_term_register_input ("console", &grub_console_term_input); +} + +void +grub_console_fini (void) +{ + grub_term_unregister_input (&grub_console_term_input); + grub_term_unregister_output (&grub_console_term_output); +} |