1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2004-2009 H. Peter Anvin - All Rights Reserved
4 * Copyright 2009 Intel Corporation; author: H. Peter Anvin
5 *
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software and associated documentation
8 * files (the "Software"), to deal in the Software without
9 * restriction, including without limitation the rights to use,
10 * copy, modify, merge, publish, distribute, sublicense, and/or
11 * sell copies of the Software, and to permit persons to whom
12 * the Software is furnished to do so, subject to the following
13 * conditions:
14 *
15 * The above copyright notice and this permission notice shall
16 * be included in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
20 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
22 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * ----------------------------------------------------------------------- */
28
29 /*
30 * ansicon_write.c
31 *
32 * Write to the screen using ANSI control codes (about as capable as
33 * DOS' ANSI.SYS.)
34 */
35
36 #include <errno.h>
37 #include <string.h>
38 #include <minmax.h>
39 #include <colortbl.h>
40 #include <klibc/compiler.h>
41 #include <syslinux/config.h>
42 #include "file.h"
43 #include "ansi.h"
44 #include <syslinux/firmware.h>
45 #include "graphics.h"
46
47 static void ansicon_erase(const struct term_state *, int, int, int, int);
48 static void ansicon_write_char(int, int, uint8_t, const struct term_state *);
49 static void ansicon_showcursor(const struct term_state *);
50 static void ansicon_scroll_up(const struct term_state *);
51 static void ansicon_set_cursor(int, int, bool);
52
53 static struct term_state ts;
54 struct ansi_ops __ansicon_ops = {
55 .erase = ansicon_erase,
56 .write_char = ansicon_write_char,
57 .showcursor = ansicon_showcursor,
58 .set_cursor = ansicon_set_cursor,
59 .scroll_up = ansicon_scroll_up,
60 .beep = __ansicon_beep,
61 };
62
63 static struct term_info ti = {
64 .disabled = 0,
65 .ts = &ts,
66 .op = &__ansicon_ops
67 };
68
69 #define TEXT_MODE 0x0005
70
71 /* Reference counter to the screen, to keep track of if we need
72 reinitialization. */
73 static int ansicon_counter = 0;
74
75 /* Common setup */
__ansicon_open(struct file_info * fp)76 int __ansicon_open(struct file_info *fp)
77 {
78 if (!ansicon_counter) {
79 /* Are we disabled? */
80 if (syslinux_serial_console_info()->flowctl & 0x8000) {
81 ti.disabled = 1;
82 ti.rows = 25;
83 ti.cols = 80;
84 } else {
85 /* Force text mode */
86 firmware->o_ops->text_mode();
87
88 /* Initial state */
89 firmware->o_ops->get_mode(&ti.cols, &ti.rows);
90 __ansi_init(&ti);
91
92 /* Get cursor shape and position */
93 firmware->o_ops->get_cursor(&ti.ts->xy.x, &ti.ts->xy.y);
94 }
95 }
96
97 fp->o.rows = ti.rows;
98 fp->o.cols = ti.cols;
99
100 ansicon_counter++;
101 return 0;
102 }
103
__ansicon_close(struct file_info * fp)104 int __ansicon_close(struct file_info *fp)
105 {
106 (void)fp;
107
108 ansicon_counter--;
109 return 0;
110 }
111
112 /* Turn ANSI attributes into VGA attributes */
ansicon_attribute(const struct term_state * st)113 static uint8_t ansicon_attribute(const struct term_state *st)
114 {
115 int bg = st->bg;
116 int fg;
117
118 if (st->underline)
119 fg = 0x01;
120 else if (st->intensity == 0)
121 fg = 0x08;
122 else
123 fg = st->fg;
124
125 if (st->reverse) {
126 bg = fg & 0x07;
127 fg &= 0x08;
128 fg |= st->bg;
129 }
130
131 if (st->blink)
132 bg ^= 0x08;
133
134 if (st->intensity == 2)
135 fg ^= 0x08;
136
137 return (bg << 4) | fg;
138 }
139
140 /* Erase a region of the screen */
ansicon_erase(const struct term_state * st,int x0,int y0,int x1,int y1)141 static void ansicon_erase(const struct term_state *st,
142 int x0, int y0, int x1, int y1)
143 {
144 uint8_t attribute = ansicon_attribute(st);
145
146 if (firmware->o_ops->erase)
147 firmware->o_ops->erase(x0, y0, x1, y1, attribute);
148 }
149
150 /* Show or hide the cursor */
ansicon_showcursor(const struct term_state * st)151 static void ansicon_showcursor(const struct term_state *st)
152 {
153 firmware->o_ops->showcursor(st);
154 }
155
ansicon_set_cursor(int x,int y,bool visible)156 static void ansicon_set_cursor(int x, int y, bool visible)
157 {
158 firmware->o_ops->set_cursor(x, y, visible);
159 }
160
ansicon_write_char(int x,int y,uint8_t ch,const struct term_state * st)161 static void ansicon_write_char(int x, int y, uint8_t ch,
162 const struct term_state *st)
163 {
164 uint8_t attribute = ansicon_attribute(st);
165 ansicon_set_cursor(x, y, false);
166
167 firmware->o_ops->write_char(ch, attribute);
168 }
169
ansicon_scroll_up(const struct term_state * st)170 static void ansicon_scroll_up(const struct term_state *st)
171 {
172 uint8_t rows, cols, attribute;
173
174 cols = ti.cols - 1;
175 rows = ti.rows - 1;
176 attribute = ansicon_attribute(st);
177
178 firmware->o_ops->scroll_up(cols, rows, attribute);
179 }
180
__ansicon_write(struct file_info * fp,const void * buf,size_t count)181 ssize_t __ansicon_write(struct file_info *fp, const void *buf, size_t count)
182 {
183 const unsigned char *bufp = buf;
184 size_t n = 0;
185
186 (void)fp;
187
188 if (ti.disabled)
189 return count; /* Nothing to do */
190
191 while (count--) {
192 __ansi_putchar(&ti, *bufp++);
193 n++;
194 }
195
196 return n;
197 }
198
__ansicon_beep(void)199 void __ansicon_beep(void)
200 {
201 if (firmware->o_ops->beep)
202 firmware->o_ops->beep();
203 }
204
205 const struct output_dev dev_ansicon_w = {
206 .dev_magic = __DEV_MAGIC,
207 .flags = __DEV_TTY | __DEV_OUTPUT,
208 .fileflags = O_WRONLY | O_CREAT | O_TRUNC | O_APPEND,
209 .write = __ansicon_write,
210 .close = __ansicon_close,
211 .open = __ansicon_open,
212 };
213