1 | /* |
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2 | * x86_printf.c - A printf function for x86 (debug only). |
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3 | * |
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4 | * Copyright (c) 2017 Maxime Villard |
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5 | * |
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6 | * This file is part of ALMOS-MKH. |
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7 | * |
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8 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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9 | * under the terms of the GNU General Public License as published by |
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10 | * the Free Software Foundation; version 2.0 of the License. |
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11 | * |
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12 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |
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22 | #include <hal_types.h> |
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23 | #include <hal_boot.h> |
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24 | #include <hal_internal.h> |
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25 | #include <hal_apic.h> |
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26 | |
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27 | #include <memcpy.h> |
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28 | #include <thread.h> |
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29 | #include <string.h> |
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30 | #include <process.h> |
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31 | #include <printk.h> |
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32 | #include <vmm.h> |
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33 | #include <core.h> |
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34 | #include <cluster.h> |
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35 | |
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36 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) |
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37 | #define CONS_X_SIZE 80 |
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38 | #define CONS_Y_SIZE 26 |
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39 | |
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40 | static char cons_buffer[CONS_X_SIZE * 2 * CONS_Y_SIZE] __in_kdata; |
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41 | extern intptr_t iom_base; |
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42 | size_t cons_ptr __in_kdata = 0; |
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43 | |
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44 | /* -------------------------------------------------------------------------- */ |
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45 | |
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46 | static uint32_t x86_lock_val __in_kdata = 0; |
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47 | |
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48 | void x86_lock() |
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49 | { |
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50 | while (!hal_atomic_cas(&x86_lock_val, 0, 1)) { |
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51 | /* wait */ |
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52 | } |
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53 | } |
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54 | |
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55 | void x86_unlock() |
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56 | { |
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57 | while (!hal_atomic_cas(&x86_lock_val, 1, 0)) { |
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58 | /* wait */ |
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59 | } |
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60 | } |
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61 | |
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62 | /* -------------------------------------------------------------------------- */ |
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63 | |
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64 | void x86_panic(char *msg) |
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65 | { |
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66 | x86_lock(); |
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67 | x86_printf("!!!!! PANIC !!!!!\n"); |
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68 | x86_printf("-> %s\n", msg); |
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69 | x86_printf("!!!!!!!!!!!!!!!!!\n"); |
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70 | x86_unlock(); |
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71 | while (1); |
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72 | } |
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73 | |
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74 | static void check_scroll() |
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75 | { |
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76 | char *base = (char *)iom_base + (0xB8000 - IOM_BEGIN); |
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77 | char *src, *dst; |
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78 | size_t i; |
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79 | |
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80 | if (cons_ptr < (CONS_X_SIZE * 2) * CONS_Y_SIZE) { |
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81 | return; |
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82 | } |
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83 | |
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84 | for (i = 0; i < CONS_Y_SIZE - 1; i++) { |
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85 | dst = (char *)&cons_buffer[0] + i * (CONS_X_SIZE * 2); |
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86 | src = (char *)&cons_buffer[0] + (i + 1) * (CONS_X_SIZE * 2); |
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87 | |
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88 | memcpy(dst, src, (CONS_X_SIZE * 2)); |
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89 | } |
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90 | |
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91 | memset(&cons_buffer[0] + (CONS_X_SIZE * 2) * (CONS_Y_SIZE - 1), |
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92 | 0, (CONS_X_SIZE * 2)); |
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93 | |
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94 | cons_ptr -= (CONS_X_SIZE * 2); |
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95 | memcpy(base, &cons_buffer[0], (CONS_X_SIZE * 2) * (CONS_Y_SIZE - 1)); |
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96 | } |
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97 | |
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98 | void x86_putc(char c) |
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99 | { |
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100 | hal_com_send(0, c); |
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101 | |
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102 | if (c == '\n') { |
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103 | cons_ptr = roundup(cons_ptr, CONS_X_SIZE * 2); |
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104 | check_scroll(); |
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105 | return; |
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106 | } |
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107 | |
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108 | char *video = (char *)iom_base + (0xB8000 - IOM_BEGIN) + cons_ptr; |
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109 | char *buf = &cons_buffer[cons_ptr]; |
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110 | *video = c; |
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111 | *buf = c; |
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112 | cons_ptr++, video++, buf++; |
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113 | *video = 0x7; |
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114 | *buf = 0x7; |
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115 | cons_ptr++, video++, buf++; |
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116 | |
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117 | check_scroll(); |
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118 | } |
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119 | |
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120 | static void x86_itoa(char *buf, unsigned long int n, int base) |
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121 | { |
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122 | unsigned long int tmp; |
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123 | int i, j; |
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124 | |
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125 | tmp = n; |
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126 | i = 0; |
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127 | |
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128 | do { |
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129 | tmp = n % base; |
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130 | buf[i++] = (tmp < 10) ? (tmp + '0') : (tmp + 'a' - 10); |
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131 | } while (n /= base); |
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132 | buf[i--] = 0; |
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133 | |
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134 | for (j = 0; j < i; j++, i--) { |
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135 | tmp = buf[j]; |
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136 | buf[j] = buf[i]; |
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137 | buf[i] = tmp; |
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138 | } |
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139 | } |
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140 | |
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141 | static void x86_ztoa(char *buf, uint64_t n, uint64_t base) |
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142 | { |
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143 | uint64_t tmp; |
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144 | int i, j; |
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145 | |
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146 | tmp = n; |
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147 | i = 0; |
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148 | |
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149 | do { |
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150 | tmp = n % base; |
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151 | buf[i++] = (tmp < 10) ? (tmp + '0') : (tmp + 'a' - 10); |
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152 | } while (n /= base); |
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153 | buf[i--] = 0; |
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154 | |
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155 | for (j = 0; j < i; j++, i--) { |
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156 | tmp = buf[j]; |
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157 | buf[j] = buf[i]; |
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158 | buf[i] = tmp; |
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159 | } |
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160 | } |
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161 | |
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162 | static char alphabet[] = "abcdefghijklmnopqrstuvwxyz"; |
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163 | |
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164 | void x86_printf(char *s, ...) |
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165 | { |
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166 | va_list ap; |
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167 | |
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168 | char buf[64]; |
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169 | int i, j, size, buflen, neg; |
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170 | |
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171 | unsigned char c; |
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172 | int ival; |
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173 | unsigned int uival; |
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174 | uint64_t zval; |
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175 | |
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176 | va_start(ap, s); |
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177 | |
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178 | while ((c = *s++)) { |
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179 | size = 0; |
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180 | neg = 0; |
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181 | |
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182 | if (c == 0) |
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183 | break; |
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184 | else if (c == '%') { |
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185 | c = *s++; |
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186 | if (c >= '0' && c <= '9') { |
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187 | size = c - '0'; |
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188 | c = *s++; |
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189 | } |
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190 | |
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191 | if (c == 'c') { |
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192 | ival = va_arg(ap, int); |
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193 | if ((ival - 97) > sizeof(alphabet)) { |
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194 | x86_printf("(unknown:%d)", ival); |
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195 | } else { |
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196 | x86_putc(alphabet[ival - 97]); |
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197 | } |
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198 | } else if (c == 'z') { |
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199 | zval = va_arg(ap, uint64_t); |
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200 | x86_ztoa(buf, zval, 10); |
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201 | |
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202 | buflen = strlen(buf); |
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203 | if (buflen < size) |
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204 | for (i = size, j = buflen; i >= 0; i--, j--) |
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205 | buf[i] = (j >= 0) ? buf[j] : '0'; |
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206 | |
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207 | x86_printf(buf); |
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208 | } else if (c == 'Z') { |
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209 | zval = va_arg(ap, uint64_t); |
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210 | x86_ztoa(buf, zval, 16); |
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211 | |
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212 | buflen = strlen(buf); |
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213 | if (buflen < size) |
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214 | for (i = size, j = buflen; i >= 0; i--, j--) |
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215 | buf[i] = (j >= 0) ? buf[j] : '0'; |
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216 | |
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217 | x86_printf("0x%s", buf); |
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218 | } else if (c == 'd') { |
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219 | ival = va_arg(ap, int); |
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220 | if (ival < 0) { |
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221 | uival = 0 - ival; |
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222 | neg++; |
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223 | } else |
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224 | uival = ival; |
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225 | x86_itoa(buf, uival, 10); |
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226 | |
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227 | buflen = strlen(buf); |
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228 | if (buflen < size) |
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229 | for (i = size, j = buflen; i >= 0; |
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230 | i--, j--) |
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231 | buf[i] = |
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232 | (j >= |
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233 | 0) ? buf[j] : '0'; |
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234 | |
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235 | if (neg) |
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236 | x86_printf("-%s", buf); |
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237 | else |
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238 | x86_printf(buf); |
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239 | } else if (c == 'u') { |
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240 | uival = va_arg(ap, int); |
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241 | x86_itoa(buf, uival, 10); |
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242 | |
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243 | buflen = strlen(buf); |
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244 | if (buflen < size) |
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245 | for (i = size, j = buflen; i >= 0; |
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246 | i--, j--) |
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247 | buf[i] = |
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248 | (j >= |
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249 | 0) ? buf[j] : '0'; |
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250 | |
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251 | x86_printf(buf); |
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252 | } else if (c == 'x' || c == 'X') { |
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253 | uival = va_arg(ap, int); |
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254 | x86_itoa(buf, uival, 16); |
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255 | |
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256 | buflen = strlen(buf); |
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257 | if (buflen < size) |
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258 | for (i = size, j = buflen; i >= 0; |
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259 | i--, j--) |
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260 | buf[i] = |
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261 | (j >= |
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262 | 0) ? buf[j] : '0'; |
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263 | |
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264 | x86_printf("0x%s", buf); |
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265 | } else if (c == 'p') { |
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266 | uival = va_arg(ap, int); |
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267 | x86_itoa(buf, uival, 16); |
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268 | size = 8; |
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269 | |
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270 | buflen = strlen(buf); |
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271 | if (buflen < size) |
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272 | for (i = size, j = buflen; i >= 0; |
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273 | i--, j--) |
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274 | buf[i] = |
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275 | (j >= |
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276 | 0) ? buf[j] : '0'; |
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277 | |
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278 | x86_printf("0x%s", buf); |
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279 | } else if (c == 's') { |
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280 | x86_printf((char *) va_arg(ap, uint64_t)); |
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281 | } |
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282 | } else |
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283 | x86_putc(c); |
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284 | } |
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285 | |
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286 | return; |
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287 | } |
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