root / prex-0.9.0 / bsp / hal / x86 / pc / diag.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * diag.c - diagnostic message support.
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32 | */
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33 | |||
34 | #include <kernel.h> |
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35 | #include <sys/bootinfo.h> |
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36 | #include <cpufunc.h> |
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37 | |||
38 | #ifdef CONFIG_DIAG_SCREEN
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39 | |||
40 | #define VID_ATTR 0x0F00 |
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41 | #define VID_PORT 0x03d4 |
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42 | #define VID_RAM 0xB8000 |
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43 | |||
44 | /* Screen info */
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45 | static short *vram; |
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46 | static int pos_x; |
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47 | static int pos_y; |
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48 | static int screen_x; |
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49 | static int screen_y; |
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50 | |||
51 | static void |
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52 | screen_scroll_up(void)
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53 | { |
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54 | int i;
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55 | |||
56 | memcpy(vram, vram + screen_x, (size_t)(screen_x * (screen_y - 1) * 2)); |
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57 | for (i = 0; i < screen_x; i++) |
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58 | vram[screen_x * (screen_y - 1) + i] = ' '; |
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59 | } |
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60 | |||
61 | static void |
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62 | screen_move_cursor(void)
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63 | { |
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64 | int pos = pos_y * screen_x + pos_x;
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65 | |||
66 | outb(VID_PORT, 0x0e);
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67 | outb(VID_PORT + 1, (u_int)pos >> 8); |
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68 | |||
69 | outb(VID_PORT, 0x0f);
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70 | outb(VID_PORT + 1, (u_int)pos & 0xff); |
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71 | } |
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72 | |||
73 | static void |
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74 | screen_newline(void)
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75 | { |
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76 | |||
77 | pos_x = 0;
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78 | pos_y++; |
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79 | if (pos_y >= screen_y) {
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80 | pos_y = screen_y - 1;
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81 | screen_scroll_up(); |
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82 | } |
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83 | } |
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84 | |||
85 | static void |
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86 | screen_putc(char c)
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87 | { |
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88 | |||
89 | switch (c) {
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90 | case '\n': |
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91 | screen_newline(); |
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92 | return;
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93 | case '\r': |
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94 | pos_x = 0;
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95 | return;
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96 | case '\b': |
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97 | if (pos_x == 0) |
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98 | return;
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99 | pos_x--; |
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100 | return;
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101 | } |
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102 | vram[pos_y * screen_x + pos_x] = c | VID_ATTR; |
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103 | pos_x++; |
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104 | if (pos_x >= screen_x) {
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105 | pos_x = 0;
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106 | pos_y++; |
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107 | if (pos_y >= screen_y) {
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108 | pos_y = screen_y - 1;
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109 | screen_scroll_up(); |
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110 | } |
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111 | } |
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112 | } |
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113 | |||
114 | void
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115 | diag_puts(char *str)
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116 | { |
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117 | |||
118 | while (*str)
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119 | screen_putc(*str++); |
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120 | |||
121 | screen_move_cursor(); |
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122 | } |
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123 | |||
124 | void
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125 | diag_init(void)
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126 | { |
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127 | struct bootinfo *bi;
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128 | |||
129 | machine_bootinfo(&bi); |
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130 | |||
131 | vram = ptokv(VID_RAM); |
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132 | pos_x = 0;
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133 | pos_y = 0;
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134 | screen_x = bi->video.text_x; |
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135 | screen_y = bi->video.text_y; |
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136 | } |
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137 | #endif /* !CONFIG_DIAG_SCREEN */ |
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138 | |||
139 | |||
140 | #ifdef CONFIG_DIAG_BOCHS
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141 | static void |
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142 | bochs_putc(char c)
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143 | { |
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144 | /* Write to the bochs debug port. */
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145 | outb(0xe9, (u_char)c);
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146 | } |
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147 | |||
148 | void
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149 | diag_puts(char *str)
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150 | { |
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151 | |||
152 | /* Skip if Bochs is not running. */
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153 | if (inb(0xe9) != 0xe9) |
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154 | return;
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155 | |||
156 | while (*str)
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157 | bochs_putc(*str++); |
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158 | } |
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159 | |||
160 | void
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161 | diag_init(void)
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162 | { |
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163 | } |
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164 | #endif /* !CONFIG_DIAG_BOCHS */ |
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165 | |||
166 | |||
167 | #ifdef CONFIG_DIAG_SERIAL
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168 | |||
169 | #define COM_BASE CONFIG_NS16550_BASE
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170 | #define COM_THR (COM_BASE + 0x00) /* transmit holding register */ |
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171 | #define COM_LSR (COM_BASE + 0x05) /* line status register */ |
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172 | |||
173 | static void |
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174 | serial_putc(char c)
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175 | { |
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176 | |||
177 | while (!(inb(COM_LSR) & 0x20)) |
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178 | ; |
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179 | outb(COM_THR, c); |
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180 | } |
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181 | |||
182 | void
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183 | diag_puts(char *str)
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184 | { |
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185 | |||
186 | while (*str) {
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187 | if (*str == '\n') |
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188 | serial_putc('\r');
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189 | serial_putc(*str++); |
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190 | } |
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191 | } |
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192 | |||
193 | /*
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194 | * We assume the serial port has already been initialized by
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195 | * the boot loader.
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196 | */
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197 | void
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198 | diag_init(void)
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199 | { |
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200 | /* DO NOTHING */
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201 | } |
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202 | |||
203 | #endif /* !CONFIG_DIAG_SERIAL */ |