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5131 | clevermous | 1 | /* |
2 | Copyright (C) 1996-1997 Id Software, Inc. |
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3 | |||
4 | This program is free software; you can redistribute it and/or |
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5 | modify it under the terms of the GNU General Public License |
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6 | as published by the Free Software Foundation; either version 2 |
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7 | of the License, or (at your option) any later version. |
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8 | |||
9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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12 | |||
13 | See the GNU General Public License for more details. |
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14 | |||
15 | You should have received a copy of the GNU General Public License |
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16 | along with this program; if not, write to the Free Software |
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17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 | |||
19 | */ |
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20 | #include |
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21 | #include |
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22 | #include |
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23 | #include |
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24 | #include |
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25 | #include |
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26 | #include |
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27 | // #include |
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28 | #include |
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29 | |||
30 | #include "dosisms.h" |
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31 | |||
32 | _go32_dpmi_registers hmm; |
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33 | |||
34 | // globals |
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35 | regs_t regs; |
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36 | void (*dos_error_func)(char *msg, ...); |
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37 | |||
38 | static unsigned conventional_memory = -1; |
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39 | |||
40 | __dpmi_regs callback_regs; |
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41 | |||
42 | void map_in_conventional_memory(void) |
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43 | { |
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44 | if (conventional_memory == -1) |
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45 | { |
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46 | if (__djgpp_nearptr_enable()) |
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47 | { |
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48 | conventional_memory = __djgpp_conventional_base; |
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49 | } |
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50 | } |
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51 | } |
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52 | |||
53 | unsigned int ptr2real(void *ptr) |
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54 | { |
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55 | map_in_conventional_memory(); |
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56 | return (int)ptr - conventional_memory; |
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57 | } |
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58 | |||
59 | void *real2ptr(unsigned int real) |
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60 | { |
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61 | map_in_conventional_memory(); |
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62 | return (void *) (real + conventional_memory); |
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63 | } |
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64 | |||
65 | void *far2ptr(unsigned int farptr) |
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66 | { |
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67 | return real2ptr(((farptr & ~0xffff) >>12) + (farptr&0xffff)); |
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68 | } |
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69 | |||
70 | unsigned int ptr2far(void *ptr) |
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71 | { |
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72 | return ((ptr2real(ptr)&~0xf) << 12) + (ptr2real(ptr) & 0xf); |
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73 | } |
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74 | |||
75 | int dos_inportb(int port) |
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76 | { |
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77 | return inportb(port); |
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78 | } |
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79 | |||
80 | int dos_inportw(int port) |
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81 | { |
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82 | return inportw(port); |
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83 | } |
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84 | |||
85 | void dos_outportb(int port, int val) |
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86 | { |
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87 | outportb(port, val); |
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88 | } |
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89 | |||
90 | void dos_outportw(int port, int val) |
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91 | { |
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92 | outportw(port, val); |
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93 | } |
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94 | |||
95 | void dos_irqenable(void) |
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96 | { |
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97 | enable(); |
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98 | } |
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99 | |||
100 | void dos_irqdisable(void) |
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101 | { |
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102 | disable(); |
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103 | } |
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104 | |||
105 | // |
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106 | // Returns 0 on success |
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107 | // |
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108 | |||
109 | int dos_int86(int vec) |
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110 | { |
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111 | int rc; |
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112 | regs.x.ss = regs.x.sp = 0; |
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113 | rc = _go32_dpmi_simulate_int(vec, (_go32_dpmi_registers *) ®s); |
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114 | return rc || (regs.x.flags & 1); |
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115 | } |
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116 | |||
117 | int dos_int386(int vec, regs_t *inregs, regs_t *outregs) |
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118 | { |
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119 | int rc; |
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120 | memcpy(outregs, inregs, sizeof(regs_t)); |
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121 | outregs->x.ss = outregs->x.sp = 0; |
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122 | rc = _go32_dpmi_simulate_int(vec, (_go32_dpmi_registers *) outregs); |
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123 | return rc || (outregs->x.flags & 1); |
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124 | } |
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125 | |||
126 | // |
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127 | // Because of a quirk in dj's alloc-dos-memory wrapper, you need to keep |
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128 | // the seginfo structure around for when you free the mem. |
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129 | // |
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130 | |||
131 | static _go32_dpmi_seginfo seginfo[10]; |
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132 | |||
133 | void *dos_getmemory(int size) |
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134 | { |
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135 | |||
136 | int rc; |
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137 | _go32_dpmi_seginfo info; |
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138 | static int firsttime=1; |
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139 | int i; |
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140 | |||
141 | if (firsttime) |
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142 | { |
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143 | memset(seginfo, 0, sizeof(seginfo)); |
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144 | firsttime = 0; |
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145 | } |
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146 | |||
147 | info.size = (size+15) / 16; |
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148 | rc = _go32_dpmi_allocate_dos_memory(&info); |
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149 | if (rc) |
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150 | return 0; |
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151 | |||
152 | for (i=0;i<10;i++) |
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153 | if (!seginfo[i].rm_segment) break; |
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154 | seginfo[i] = info; |
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155 | return real2ptr((int) info.rm_segment << 4); |
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156 | |||
157 | } |
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158 | |||
159 | void dos_freememory(void *ptr) |
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160 | { |
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161 | |||
162 | int i; |
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163 | int segment; |
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164 | |||
165 | segment = ptr2real(ptr) >> 4; |
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166 | for (i=0 ; i<10 ; i++) |
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167 | if (seginfo[i].rm_segment == segment) |
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168 | { |
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169 | _go32_dpmi_free_dos_memory(&seginfo[i]); |
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170 | seginfo[i].rm_segment = 0; |
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171 | break; |
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172 | } |
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173 | |||
174 | } |
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175 | |||
176 | static struct handlerhistory_s |
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177 | { |
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178 | int intr; |
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179 | _go32_dpmi_seginfo pm_oldvec; |
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180 | } handlerhistory[4]; |
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181 | |||
182 | static int handlercount=0; |
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183 | |||
184 | void dos_registerintr(int intr, void (*handler)(void)) |
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185 | { |
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186 | _go32_dpmi_seginfo info; |
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187 | struct handlerhistory_s *oldstuff; |
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188 | |||
189 | oldstuff = &handlerhistory[handlercount]; |
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190 | |||
191 | // remember old handler |
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192 | _go32_dpmi_get_protected_mode_interrupt_vector(intr, &oldstuff->pm_oldvec); |
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193 | oldstuff->intr = intr; |
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194 | |||
195 | info.pm_offset = (int) handler; |
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196 | _go32_dpmi_allocate_iret_wrapper(&info); |
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197 | |||
198 | // set new protected mode handler |
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199 | _go32_dpmi_set_protected_mode_interrupt_vector(intr, &info); |
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200 | |||
201 | handlercount++; |
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202 | |||
203 | } |
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204 | |||
205 | void dos_restoreintr(int intr) |
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206 | { |
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207 | |||
208 | int i; |
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209 | struct handlerhistory_s *oldstuff; |
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210 | |||
211 | // find and reinstall previous interrupt |
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212 | for (i=0 ; i |
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213 | { |
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214 | oldstuff = &handlerhistory[i]; |
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215 | if (oldstuff->intr == intr) |
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216 | { |
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217 | _go32_dpmi_set_protected_mode_interrupt_vector(intr, |
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218 | &oldstuff->pm_oldvec); |
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219 | oldstuff->intr = -1; |
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220 | break; |
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221 | } |
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222 | } |
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223 | |||
224 | } |
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225 | |||
226 | void dos_usleep(int usecs) |
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227 | { |
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228 | usleep(usecs); |
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229 | } |
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230 | |||
231 | int dos_getheapsize(void) |
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232 | { |
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233 | return _go32_dpmi_remaining_physical_memory(); |
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234 | } |
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235 | |||
236 | int dos_lockmem(void *addr, int size) |
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237 | { |
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238 | __dpmi_meminfo info; |
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239 | info.address = (long) addr + __djgpp_base_address; |
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240 | info.size = size; |
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241 | if (__dpmi_lock_linear_region(&info)) |
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242 | return __dpmi_error; |
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243 | else |
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244 | return 0; |
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245 | } |
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246 | |||
247 | int dos_unlockmem(void *addr, int size) |
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248 | { |
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249 | __dpmi_meminfo info; |
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250 | info.address = (long) addr + __djgpp_base_address; |
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251 | info.size = size; |
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252 | if (__dpmi_unlock_linear_region(&info)) |
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253 | return __dpmi_error; |
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254 | else |
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255 | return 0; |
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256 | }10>><>10;i++) |
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257 |