source: mainline/kernel/genarch/src/drivers/ega/ega.c@ ee06f2a

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since ee06f2a was ee06f2a, checked in by Jakub Jermar <jakub@…>, 16 years ago

Introduce a more platform-neutral name for programmed I/O.

The new API looks like pio_read_n() or pio_write_n(), where n is 8, 16 or 32.
The old API (i.e. inb(), inw(), inl(), outb() outw(), outl()) may have made
some people think that the interface is only to be used with the separate I/O
space. That's not the case. This API is to be implemented on all platforms
so that we can finally have really generic kernel device drivers.

  • Property mode set to 100644
File size: 4.7 KB
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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
65chardev_t ega_console;
66
67/*
68 * This function takes care of scrolling.
69 */
70static void ega_check_cursor(void)
71{
72 if (ega_cursor < SCREEN)
73 return;
74
75 memmove((void *) videoram, (void *) (videoram + ROW * 2),
76 (SCREEN - ROW) * 2);
77 memmove((void *) backbuf, (void *) (backbuf + ROW * 2),
78 (SCREEN - ROW) * 2);
79 memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720);
80 memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720);
81 ega_cursor = ega_cursor - ROW;
82}
83
84static void ega_move_cursor(void)
85{
86 pio_write_8(ega_base + EGA_INDEX_REG, 0xe);
87 pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff));
88 pio_write_8(ega_base + EGA_INDEX_REG, 0xf);
89 pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff));
90}
91
92static void ega_display_char(char ch, bool silent)
93{
94 backbuf[ega_cursor * 2] = ch;
95
96 if (!silent)
97 videoram[ega_cursor * 2] = ch;
98}
99
100static void ega_putchar(chardev_t *d __attribute__((unused)), const char ch, bool silent)
101{
102 ipl_t ipl;
103
104 ipl = interrupts_disable();
105 spinlock_lock(&egalock);
106
107 switch (ch) {
108 case '\n':
109 ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
110 break;
111 case '\t':
112 ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
113 break;
114 case '\b':
115 if (ega_cursor % ROW)
116 ega_cursor--;
117 break;
118 default:
119 ega_display_char(ch, silent);
120 ega_cursor++;
121 break;
122 }
123 ega_check_cursor();
124
125 if (!silent)
126 ega_move_cursor();
127
128 spinlock_unlock(&egalock);
129 interrupts_restore(ipl);
130}
131
132static chardev_operations_t ega_ops = {
133 .write = ega_putchar
134};
135
136void ega_init(ioport_t base, uintptr_t videoram_phys)
137{
138 /* Initialize the software structure. */
139 ega_base = base;
140
141 backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
142 if (!backbuf)
143 panic("Unable to allocate backbuffer.");
144
145 videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
146
147 /* Clear the screen and set the cursor position. */
148 memsetw(videoram, SCREEN, 0x0720);
149 memsetw(backbuf, SCREEN, 0x0720);
150 ega_move_cursor();
151
152 chardev_initialize("ega_out", &ega_console, &ega_ops);
153 stdout = &ega_console;
154
155 ega_parea.pbase = videoram_phys;
156 ega_parea.vbase = (uintptr_t) videoram;
157 ega_parea.frames = 1;
158 ega_parea.cacheable = false;
159 ddi_parea_register(&ega_parea);
160
161 sysinfo_set_item_val("fb", NULL, true);
162 sysinfo_set_item_val("fb.kind", NULL, 2);
163 sysinfo_set_item_val("fb.width", NULL, ROW);
164 sysinfo_set_item_val("fb.height", NULL, ROWS);
165 sysinfo_set_item_val("fb.blinking", NULL, true);
166 sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys);
167}
168
169void ega_redraw(void)
170{
171 memcpy(videoram, backbuf, SCREEN * 2);
172 ega_move_cursor();
173}
174
175/** @}
176 */
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