source: mainline/kernel/genarch/src/drivers/ega/ega.c@ f651e80

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since f651e80 was f651e80, checked in by Jiri Svoboda <jirik.svoboda@…>, 17 years ago

Make newlines in panic messages consistent. Add periods at end of messages so that it is obvious whether they are printed entirely.

  • Property mode set to 100644
File size: 4.7 KB
Line 
1/*
2 * Copyright (c) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup genarch_drivers
30 * @{
31 */
32/**
33 * @file
34 * @brief EGA driver.
35 */
36
37#include <genarch/drivers/ega/ega.h>
38#include <putchar.h>
39#include <mm/page.h>
40#include <mm/as.h>
41#include <mm/slab.h>
42#include <arch/mm/page.h>
43#include <synch/spinlock.h>
44#include <arch/types.h>
45#include <arch/asm.h>
46#include <memstr.h>
47#include <console/chardev.h>
48#include <console/console.h>
49#include <sysinfo/sysinfo.h>
50#include <ddi/ddi.h>
51
52/*
53 * The EGA driver.
54 * Simple and short. Function for displaying characters and "scrolling".
55 */
56
57static parea_t ega_parea; /**< Physical memory area for EGA video RAM. */
58
59SPINLOCK_INITIALIZE(egalock);
60static uint32_t ega_cursor;
61static uint8_t *videoram;
62static uint8_t *backbuf;
63static ioport_t ega_base;
64
65static void ega_putchar(chardev_t *d, const char ch);
66
67chardev_t ega_console;
68static chardev_operations_t ega_ops = {
69 .write = ega_putchar
70};
71
72static void ega_move_cursor(void);
73
74void ega_init(ioport_t base, uintptr_t videoram_phys)
75{
76 /* Initialize the software structure. */
77 ega_base = base;
78
79 backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
80 if (!backbuf)
81 panic("Unable to allocate backbuffer.");
82
83 videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
84
85 /* Clear the screen and set the cursor position. */
86 memsetw(videoram, SCREEN, 0x0720);
87 memsetw(backbuf, SCREEN, 0x0720);
88 ega_move_cursor();
89
90 chardev_initialize("ega_out", &ega_console, &ega_ops);
91 stdout = &ega_console;
92
93 ega_parea.pbase = videoram_phys;
94 ega_parea.vbase = (uintptr_t) videoram;
95 ega_parea.frames = 1;
96 ega_parea.cacheable = false;
97 ddi_parea_register(&ega_parea);
98
99 sysinfo_set_item_val("fb", NULL, true);
100 sysinfo_set_item_val("fb.kind", NULL, 2);
101 sysinfo_set_item_val("fb.width", NULL, ROW);
102 sysinfo_set_item_val("fb.height", NULL, ROWS);
103 sysinfo_set_item_val("fb.blinking", NULL, true);
104 sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
105}
106
107static void ega_display_char(char ch)
108{
109 videoram[ega_cursor * 2] = ch;
110 backbuf[ega_cursor * 2] = ch;
111}
112
113/*
114 * This function takes care of scrolling.
115 */
116static void ega_check_cursor(void)
117{
118 if (ega_cursor < SCREEN)
119 return;
120
121 memmove((void *) videoram, (void *) (videoram + ROW * 2),
122 (SCREEN - ROW) * 2);
123 memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
124 (SCREEN - ROW) * 2);
125 memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
126 memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
127 ega_cursor = ega_cursor - ROW;
128}
129
130void ega_putchar(chardev_t *d __attribute__((unused)), const char ch)
131{
132 ipl_t ipl;
133
134 ipl = interrupts_disable();
135 spinlock_lock(&egalock);
136
137 switch (ch) {
138 case '\n':
139 ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
140 break;
141 case '\t':
142 ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
143 break;
144 case '\b':
145 if (ega_cursor % ROW)
146 ega_cursor--;
147 break;
148 default:
149 ega_display_char(ch);
150 ega_cursor++;
151 break;
152 }
153 ega_check_cursor();
154 ega_move_cursor();
155
156 spinlock_unlock(&egalock);
157 interrupts_restore(ipl);
158}
159
160void ega_move_cursor(void)
161{
162 outb(ega_base + EGA_INDEX_REG, 0xe);
163 outb(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
164 outb(ega_base + EGA_INDEX_REG, 0xf);
165 outb(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
166}
167
168void ega_redraw(void)
169{
170 memcpy(videoram, backbuf, SCREEN * 2);
171 ega_move_cursor();
172}
173
174/** @}
175 */
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