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1.1 nbrk 1: /*-
2: * Copyright (c) 2005-2007, Kohsuke Ohtani
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: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. Neither the name of the author nor the names of any co-contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * diag.c - diagnostic message support
32: */
33:
34: #include <kernel.h>
35: #include <page.h>
36: #include <cpu.h>
37:
38: #ifdef DEBUG
39: #ifdef CONFIG_DIAG_SCREEN
40:
41: #define VID_ATTR 0x0F00
42: #define VID_PORT 0x03d4
43: #define VID_RAM 0xB8000
44:
45: /* Screen info */
46: static short *vram;
47: static int pos_x;
48: static int pos_y;
49: static int screen_x;
50: static int screen_y;
51:
52: static void
53: screen_scrollup(void)
54: {
55: int i;
56:
57: memcpy(vram, vram + screen_x, screen_x * (screen_y - 1) * 2);
58: for (i = 0; i < screen_x; i++)
59: vram[screen_x * (screen_y - 1) + i] = ' ';
60: }
61:
62: static void
63: screen_update(void)
64: {
65: int pos = pos_y * screen_x + pos_x;
66:
67: outb(0x0e, VID_PORT);
68: outb(pos >> 8, VID_PORT + 1);
69:
70: outb(0x0f, VID_PORT);
71: outb(pos & 0xff, VID_PORT + 1);
72: }
73:
74: static void
75: screen_newline(void)
76: {
77:
78: pos_x = 0;
79: pos_y++;
80: if (pos_y >= screen_y) {
81: pos_y = screen_y - 1;
82: screen_scrollup();
83: }
84: screen_update();
85: }
86:
87: static void
88: screen_putchar(char c)
89: {
90:
91: switch (c) {
92: case '\n':
93: screen_newline();
94: return;
95: case '\r':
96: pos_x = 0;
97: screen_update();
98: return;
99: case '\b':
100: if (pos_x == 0)
101: return;
102: pos_x--;
103: screen_update();
104: return;
105: }
106: vram[pos_y * screen_x + pos_x] = c | VID_ATTR;
107: pos_x++;
108: if (pos_x >= screen_x) {
109: pos_x = 0;
110: pos_y++;
111: if (pos_y >= screen_y) {
112: pos_y = screen_y - 1;
113: screen_scrollup();
114: }
115: }
116: screen_update();
117: }
118:
119: static int
120: screen_init(void)
121: {
122:
123: vram = (short *)phys_to_virt(VID_RAM);
124: pos_x = 0;
125: pos_y = 0;
126: screen_x = boot_info->video.text_x;
127: screen_y = boot_info->video.text_y;
128: return 0;
129: }
130: #endif /* CONFIG_DIAG_SCREEN */
131:
132:
133: #ifdef CONFIG_DIAG_BOCHS
134: static void
135: bochs_putchar(char c)
136: {
137: /*
138: * Bochs debug port
139: */
140: if (inb(0xe9) == 0xe9)
141: outb(c, 0xe9);
142: }
143: #endif /* CONFIG_DIAG_BOCHS */
144:
145: void
146: diag_print(char *buf)
147: {
148:
149: while (*buf) {
150: #ifdef CONFIG_DIAG_SCREEN
151: screen_putchar(*buf);
152: #endif
153: #ifdef CONFIG_DIAG_BOCHS
154: bochs_putchar(*buf);
155: #endif
156: ++buf;
157: }
158: }
159: #endif /* DEBUG */
160:
161: void
162: diag_init(void)
163: {
164: #if defined(DEBUG) && defined(CONFIG_DIAG_SCREEN)
165: screen_init();
166: #endif
167: }