/*
* outch.c - This file contains code for displaying characters
* on the console uisng information that should be
* maintained by the BIOS in its data Area.
*
* Copyright (C) 1998 valette@crf.canon.fr
*
* Canon Centre Recherche France.
*
* This code is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This code 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this file; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*/
#include <bsp.h>
#include <stdlib.h>
#include <string.h>
#include <crt.h>
extern void wr_cursor(int, unsigned short);
#define TAB_SPACE 4
static unsigned short *bitMapBaseAddr;
static unsigned short ioCrtBaseAddr;
static unsigned short maxCol;
static unsigned short maxRow;
static unsigned char row;
static unsigned char column;
static unsigned short attribute;
static unsigned int nLines;
static void
scroll()
{
int i, j; /* Counters */
unsigned short *pt_scroll, *pt_bitmap; /* Pointers on the bit-map */
pt_bitmap = bitMapBaseAddr;
j = 0;
pt_bitmap = pt_bitmap + j;
pt_scroll = pt_bitmap + maxCol;
for (i = j; i < (maxRow - 1) * maxCol; i++) {
*pt_bitmap++ = *pt_scroll++;
}
/*
* Blank characters are displayed on the last line.
*/
for (i = 0; i < maxCol; i++) {
*pt_bitmap++ = (short) (' ' | attribute);
}
}
static void
endColumn()
{
if (++row == maxRow) {
scroll(); /* Scroll the screen now */
row = maxRow - 1;
}
column = 0;
nLines++;
/* Move cursor on the next location */
wr_cursor(row * maxCol + column, ioCrtBaseAddr);
}
static void
videoPutChar(char car)
{
unsigned short *pt_bitmap = bitMapBaseAddr + row * maxCol;
switch (car) {
case '\b': {
if (column) column--;
/* Move cursor on the previous location */
wr_cursor(row * maxCol + column, ioCrtBaseAddr);
return;
}
case '\t': {
int i;
i = TAB_SPACE - (column & (TAB_SPACE - 1));
pt_bitmap += column;
column += i;
if (column >= maxCol) {
endColumn();
return;
}
while (i--) *pt_bitmap++ = ' ' | attribute;
wr_cursor(row * maxCol + column, ioCrtBaseAddr);
return;
}
case '\n': {
endColumn();
return;
}
case 7: { /* Bell code must be inserted here */
return;
}
case '\r' : { /* Already handled via \n */
return;
}
default: {
pt_bitmap += column;
*pt_bitmap = car | attribute;
if (++column == maxCol) endColumn();
else wr_cursor(row * maxCol + column,
ioCrtBaseAddr);
return;
}
}
}
void
clear_screen()
{
int i,j;
for (j = 0; j <= maxRow; j++) {
for (i = 0; i <= maxCol; i++) {
videoPutChar(' ');
}
}
column = 0;
row = 0;
}
/*-------------------------------------------------------------------------+
| Function: _IBMPC_outch
| Description: Higher level (console) interface to consPutc.
| Global Variables: None.
| Arguments: c - character to write to console.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
_IBMPC_outch(char c)
{
videoPutChar(c);
} /* _IBMPC_outch */
/*-------------------------------------------------------------------------+
| Function: _IBMPC_initVideo
| Description: Video system initialization. Hook for any early setup.
| Global Variables: bitMapBaseAddr, ioCrtBaseAddr, maxCol, maxRow, row
| column, attribute, nLines;
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
_IBMPC_initVideo(void)
{
unsigned char* pt = (unsigned char*) (VIDEO_MODE_ADDR);
if (*pt == VGAMODE7) {
bitMapBaseAddr = (unsigned short*) V_MONO;
}
else {
bitMapBaseAddr = (unsigned short*) V_COLOR;
}
ioCrtBaseAddr = *(unsigned short*) DISPLAY_CRT_BASE_IO_ADDR;
maxCol = * (unsigned short*) NB_MAX_COL_ADDR;
maxRow = * (unsigned char*) NB_MAX_ROW_ADDR;
column = 0;
row = 0;
attribute = ((BLACK << 4) | WHITE)<<8;
nLines = 0;
clear_screen();
#ifdef DEBUG_EARLY_STAGE
printk("bitMapBaseAddr = %X, display controller base IO = %X\n",
(unsigned) bitMapBaseAddr,
(unsigned) ioCrtBaseAddr);
videoPrintf("maxCol = %d, maxRow = %d\n", (unsigned) maxCol, (unsigned) maxRow);
#endif
} /* _IBMPC_initVideo */
