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/* hercules.c - hercules console interface */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2001,2002 Free Software Foundation, Inc.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef SUPPORT_HERCULES
#include <shared.h>
#include <hercules.h>
#include <term.h>
/* The position of the cursor. */
static int herc_x;
static int herc_y;
static int herc_standard_color = A_NORMAL;
static int herc_normal_color = A_NORMAL;
static int herc_highlight_color = A_REVERSE;
static int herc_current_color = A_NORMAL;
static color_state herc_color_state = COLOR_STATE_STANDARD;
static int herc_cursor_state = 1;
/* Write a byte to a port. */
static inline void
outb (unsigned short port, unsigned char value)
{
asm volatile ("outb %b0, %w1" : : "a" (value), "Nd" (port));
}
static void
herc_set_cursor (void)
{
unsigned offset = herc_y * HERCULES_WIDTH + herc_x;
outb (HERCULES_INDEX_REG, 0x0f);
outb (0x80, 0);
outb (HERCULES_DATA_REG, offset & 0xFF);
outb (0x80, 0);
outb (HERCULES_INDEX_REG, 0x0e);
outb (0x80, 0);
outb (HERCULES_DATA_REG, offset >> 8);
outb (0x80, 0);
}
void
hercules_putchar (int c)
{
switch (c)
{
case '\b':
if (herc_x > 0)
herc_x--;
break;
case '\n':
herc_y++;
break;
case '\r':
herc_x = 0;
break;
case '\a':
break;
default:
{
volatile unsigned short *video
= (unsigned short *) HERCULES_VIDEO_ADDR;
video[herc_y * HERCULES_WIDTH + herc_x]
= (herc_current_color << 8) | c;
herc_x++;
if (herc_x >= HERCULES_WIDTH)
{
herc_x = 0;
herc_y++;
}
}
break;
}
if (herc_y >= HERCULES_HEIGHT)
{
volatile unsigned long *video = (unsigned long *) HERCULES_VIDEO_ADDR;
int i;
herc_y = HERCULES_HEIGHT - 1;
grub_memmove ((char *) HERCULES_VIDEO_ADDR,
(char *) HERCULES_VIDEO_ADDR + HERCULES_WIDTH * 2,
HERCULES_WIDTH * (HERCULES_HEIGHT - 1) * 2);
for (i = HERCULES_WIDTH * (HERCULES_HEIGHT - 1) / 2;
i < HERCULES_WIDTH * HERCULES_HEIGHT / 2;
i++)
video[i] = 0x07200720;
}
}
void
hercules_cls (void)
{
int i;
volatile unsigned long *video = (unsigned long *) HERCULES_VIDEO_ADDR;
for (i = 0; i < HERCULES_WIDTH * HERCULES_HEIGHT / 2; i++)
video[i] = 0x07200720;
herc_x = herc_y = 0;
herc_set_cursor ();
}
int
hercules_getxy (void)
{
return (herc_x << 8) | herc_y;
}
void
hercules_gotoxy (int x, int y)
{
herc_x = x;
herc_y = y;
herc_set_cursor ();
}
void
hercules_setcolorstate (color_state state)
{
switch (state) {
case COLOR_STATE_STANDARD:
herc_current_color = herc_standard_color;
break;
case COLOR_STATE_NORMAL:
herc_current_color = herc_normal_color;
break;
case COLOR_STATE_HIGHLIGHT:
herc_current_color = herc_highlight_color;
break;
default:
herc_current_color = herc_standard_color;
break;
}
herc_color_state = state;
}
void
hercules_setcolor (int normal_color, int highlight_color)
{
herc_normal_color = normal_color;
herc_highlight_color = highlight_color;
hercules_setcolorstate (herc_color_state);
}
int
hercules_setcursor (int on)
{
int old_state = herc_cursor_state;
outb (HERCULES_INDEX_REG, 0x0a);
outb (0x80, 0);
outb (HERCULES_DATA_REG, on ? 0 : (1 << 5));
outb (0x80, 0);
herc_cursor_state = on;
return old_state;
}
#endif /* SUPPORT_HERCULES */
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