1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
/*-------------------------------------------------------------------------+
| outch.c v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is based on:
| outch.c,v 1.4 1995/12/19 20:07:27 joel Exp - go32 BSP
| With the following copyright notice:
| **************************************************************************
| * COPYRIGHT (c) 1989-1998.
| * On-Line Applications Research Corporation (OAR).
| * Copyright assigned to U.S. Government, 1994.
| *
| * The license and distribution terms for this file may be
| * found in found in the file LICENSE in this distribution or at
| * http://www.OARcorp.com/rtems/license.html.
| **************************************************************************
|
| $Id$
+--------------------------------------------------------------------------*/
#include <bsp.h>
#include <stdlib.h>
#include <string.h>
/*-------------------------------------------------------------------------+
| Constants
+--------------------------------------------------------------------------*/
#define DISPLAY_CELL_COUNT (MAX_ROW * MAX_COL)
/* Number of display cells. */
#define TABSIZE 4 /* Number of spaces for TAB (\t) char. */
#define WHITE 0x0700 /* White on Black background colour. */
#define BLANK (WHITE | ' ') /* Blank character. */
/*-------------------------------------------------------------------------+
| Global Variables
+--------------------------------------------------------------------------*/
static rtems_unsigned16 *videoRam = TVRAM;
/* Physical address of start of video text memory. */
static rtems_unsigned16 *videoRamPtr = TVRAM;
/* Pointer for current output position in display. */
static rtems_unsigned8 videoRows = MAX_ROW; /* Number of rows in display. */
static rtems_unsigned8 videoCols = MAX_COL; /* Number of columns in display. */
static rtems_unsigned8 cursRow = 0; /* Current cursor row. */
static rtems_unsigned8 cursCol = 0; /* Current cursor column. */
/*-------------------------------------------------------------------------+
| Function: setHardwareCursorPos
| Description: Set hardware video cursor at given offset into video RAM.
| Global Variables: None.
| Arguments: videoCursor - Offset into video memory.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
setHardwareCursorPos(rtems_unsigned16 videoCursor)
{
outport_byte(GDC_REG_PORT, 0xe);
outport_byte(GDC_VAL_PORT, (videoCursor >> 8) & 0xff);
outport_byte(GDC_REG_PORT, 0xf);
outport_byte(GDC_VAL_PORT, videoCursor & 0xff);
} /* setHardwareCursorPos */
/*-------------------------------------------------------------------------+
| Function: updateVideoRamPtr
| Description: Updates value of global variable "videoRamPtr" based on
| current window's cursor position.
| Global Variables: videoRamPtr, cursRow, cursCol.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
updateVideoRamPtr(void)
{
videoRamPtr = videoRam + cursRow * videoCols + cursCol;
} /* updateVideoRamPtr */
/*-------------------------------------------------------------------------+
| Function: scrollUp
| Description: Scrolls display up n lines.
| Global Variables: None.
| Arguments: lines - number of lines to scroll.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void
scrollUp(rtems_unsigned8 lines)
{
rtems_unsigned16 blankCount;
/* Number of blank display cells on bottom of window. */
rtems_unsigned16 *ptrDst, *ptrSrc;
/* Source and destination pointers for memory copy operations. */
if (lines < videoRows) /* Move window's contents up. */
{
rtems_unsigned16 nonBlankCount;
/* Number of non-blank cells on upper part of display (total - blank). */
blankCount = lines * videoCols;
nonBlankCount = DISPLAY_CELL_COUNT - blankCount;
ptrSrc = videoRam + blankCount;
ptrDst = videoRam;
while(nonBlankCount--)
*ptrDst++ = *ptrSrc++;
}
else /* Clear the whole display. */
{
blankCount = DISPLAY_CELL_COUNT;
ptrDst = videoRam;
}
/* Fill bottom with blanks. */
while (blankCount-- > 0)
*ptrDst++ = BLANK;
} /* scrollUp */
/*-------------------------------------------------------------------------+
| Function: printCHAR
| Description: Print printable character to display.
| Global Variables: videoRamPtr, cursRow, cursCol.
| Arguments: c - character to write to display.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void
printCHAR(char c)
{
*videoRamPtr++ = c | WHITE;
cursCol++;
if (cursCol == videoCols)
{
cursCol = 0;
cursRow++;
if (cursRow == videoRows)
{
cursRow--;
scrollUp(1);
videoRamPtr -= videoCols;
}
}
} /* printCHAR */
/*-------------------------------------------------------------------------+
| Function: printBS
| Description: Print BS (BackSpace - '\b') character to display.
| Global Variables: videoRamPtr, cursRow, cursCol.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
printBS(void)
{
/* Move cursor back one cell. */
if (cursCol > 0)
cursCol--;
else if (cursRow > 0)
{
cursRow--;
cursCol = videoCols - 1;
}
else
return;
/* Write a whitespace. */
*(--videoRamPtr) = BLANK;
} /* printBS */
/*-------------------------------------------------------------------------+
| Function: printHT
| Description: Print HT (Horizontal Tab - '\t') character to display.
| Global Variables: cursCol.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
printHT(void)
{
do
printCHAR(' ');
while (cursCol % TABSIZE);
} /* printHT */
/*-------------------------------------------------------------------------+
| Function: printLF
| Description: Print LF (Line Feed - '\n') character to display.
| Global Variables: cursRow.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
printLF(void)
{
cursRow++;
if (cursRow == videoRows)
{
cursRow--;
scrollUp(1);
}
updateVideoRamPtr();
} /* printLF */
/*-------------------------------------------------------------------------+
| Function: printCR
| Description: Print CR (Carriage Return - '\r') to display.
| Global Variables: cursCol.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static inline void
printCR(void)
{
cursCol = 0;
updateVideoRamPtr();
} /* printCR */
/*-------------------------------------------------------------------------+
| Function: consPutc
| Description: Print a character to display at current position.
| Global Variables: videoRamPtr, videoRam.
| Arguments: c - character to write to display.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
static void
consPutc(char c)
{
switch (c)
{
case '\b': printBS(); break;
case '\t': printHT(); break;
case '\n': printLF(); break;
case '\r': printCR(); break;
default: printCHAR(c); break;
} /* switch */
setHardwareCursorPos(videoRamPtr - videoRam);
/* At current offset into videoRam */
} /* consPutc */
/*-------------------------------------------------------------------------+
| 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)
{
consPutc(c);
} /* _IBMPC_outch */
/*-------------------------------------------------------------------------+
| Function: _IBMPC_initVideo
| Description: Video system initialization. Hook for any early setup.
| Global Variables: videoRows.
| Arguments: None.
| Returns: Nothing.
+--------------------------------------------------------------------------*/
void
_IBMPC_initVideo(void)
{
scrollUp(videoRows); /* Clear entire screen */
setHardwareCursorPos(0); /* Cursor at upper left corner */
} /* _IBMPC_initVideo */
|
