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