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/*
* 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
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