128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/* Copyright (C) 2004 David Decotigny
|
|
|
|
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
USA.
|
|
*/
|
|
#include <sos/klibc.h>
|
|
#include <hwcore/ioports.h>
|
|
|
|
#include "x86_videomem.h"
|
|
|
|
/* The text video memory starts at address 0xB8000. Odd bytes are the
|
|
ASCII value of the character, even bytes are attribute for the
|
|
preceding character. */
|
|
#define VIDEO 0xb8000
|
|
|
|
|
|
/* Console screen size */
|
|
#define LINES 25
|
|
#define COLUMNS 80
|
|
|
|
|
|
/** The structure of a character element in the video memory. @see
|
|
http://webster.cs.ucr.edu/AoA DOS edition chapter 23 */
|
|
typedef struct {
|
|
unsigned char character;
|
|
unsigned char attribute;
|
|
} __attribute__ ((packed)) x86_video_mem[LINES*COLUMNS];
|
|
|
|
|
|
|
|
/** The base pointer for the video memory */
|
|
static volatile x86_video_mem *video = (volatile x86_video_mem*)VIDEO;
|
|
|
|
sos_ret_t sos_x86_videomem_setup(void)
|
|
{
|
|
/*
|
|
* Hide cursor. @see Ralf Brown's interrupt (and port) list
|
|
* http://www-2.cs.cmu.edu/~ralf/files.html
|
|
*/
|
|
#define CRT_REG_INDEX 0x3d4
|
|
#define CRT_REG_DATA 0x3d5
|
|
|
|
/* CRT index port => ask for access to register 0xa ("cursor
|
|
start") */
|
|
outb(0x0a, CRT_REG_INDEX);
|
|
|
|
/* (RBIL Tables 708 & 654) CRT Register 0xa => bit 5 = cursor OFF */
|
|
outb(1 << 5, CRT_REG_DATA);
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_x86_videomem_cls(unsigned char attribute)
|
|
{
|
|
/* Clears the screen */
|
|
int i;
|
|
for(i = 0 ; i < LINES*COLUMNS ; i++)
|
|
{
|
|
(*video)[i].character = 0;
|
|
(*video)[i].attribute = attribute;
|
|
}
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_x86_videomem_putstring(unsigned char row, unsigned char col,
|
|
unsigned char attribute,
|
|
const char *str)
|
|
{
|
|
unsigned video_offs = row*COLUMNS + col;
|
|
|
|
if (video_offs >= LINES*COLUMNS)
|
|
return -SOS_EINVAL;
|
|
|
|
for ( ; str && *str && (video_offs < LINES*COLUMNS) ; str++, video_offs++)
|
|
{
|
|
(*video)[video_offs].character = (unsigned char)*str;
|
|
(*video)[video_offs].attribute = attribute;
|
|
}
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_x86_videomem_putchar(unsigned char row, unsigned char col,
|
|
unsigned char attribute,
|
|
unsigned char c)
|
|
{
|
|
unsigned video_offs = row*COLUMNS + col;
|
|
|
|
if (video_offs >= LINES*COLUMNS)
|
|
return -SOS_EINVAL;
|
|
|
|
(*video)[video_offs].character = c;
|
|
(*video)[video_offs].attribute = attribute;
|
|
|
|
return SOS_OK;
|
|
}
|
|
|
|
|
|
sos_ret_t sos_x86_videomem_printf(unsigned char row, unsigned char col,
|
|
unsigned char attribute,
|
|
const char *format, /* args */...)
|
|
{
|
|
char buff[256];
|
|
va_list ap;
|
|
|
|
va_start(ap, format);
|
|
vsnprintf(buff, sizeof(buff), format, ap);
|
|
va_end(ap);
|
|
|
|
return sos_x86_videomem_putstring(row, col, attribute, buff);
|
|
}
|