2 * All this is mostly based on rlyeh's minimal library.
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3 * Copied here to review all his code and understand what's going on.
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8 GP2X minimal library v0.A by rlyeh, (c) 2005. emulnation.info@rlyeh (swap it!)
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10 Thanks to Squidge, Robster, snaff, Reesy and NK, for the help & previous work! :-)
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15 Free for non-commercial projects (it would be nice receiving a mail from you).
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16 Other cases, ask me first.
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18 GamePark Holdings is not allowed to use this library and/or use parts from it.
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27 #include <sys/mman.h>
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28 #include <sys/types.h>
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29 #include <sys/stat.h>
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30 #include <sys/ioctl.h>
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31 #include <sys/soundcard.h>
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38 volatile unsigned short *gp2x_memregs;
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40 volatile unsigned long *gp2x_memregl;
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41 static void *gp2x_screens[4];
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42 static int screensel = 0;
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45 static int sounddev = 0, mixerdev = 0;
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49 #define FRAMEBUFF_ADDR0 0x4000000-640*480
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50 #define FRAMEBUFF_ADDR1 0x4000000-640*480*2
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51 #define FRAMEBUFF_ADDR2 0x4000000-640*480*3
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52 #define FRAMEBUFF_ADDR3 0x4000000-640*480*4
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54 static const int gp2x_screenaddrs[] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };
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58 void gp2x_video_flip(void)
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60 unsigned int address = gp2x_screenaddrs[screensel&3];
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64 int i; char *p=gp2x_screen;
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65 for (i=0; i < 240; i++) { memset(p+i*320, 0, 32); }
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68 gp2x_memregs[0x290E>>1]=(unsigned short)(address);
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69 gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16);
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70 gp2x_memregs[0x2912>>1]=(unsigned short)(address);
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71 gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16);
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73 // jump to other buffer:
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74 gp2x_screen = gp2x_screens[++screensel&3];
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78 void gp2x_video_changemode(int bpp)
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80 gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/
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81 gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/
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83 gp2x_memset_all_buffers(0, 0, 640*480);
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88 void gp2x_video_setpalette(int *pal, int len)
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90 unsigned short *g=(unsigned short *)pal;
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91 volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];
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92 gp2x_memregs[0x2958>>1] = 0;
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95 while(len--) *memreg=*g++;
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99 // TV Compatible function //
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100 void gp2x_video_RGB_setscaling(int W, int H)
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102 float escalaw, escalah;
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103 int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;
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105 escalaw = 1024.0; // RGB Horiz LCD
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106 escalah = 320.0; // RGB Vert LCD
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108 if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out
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110 escalaw=489.0; // RGB Horiz TV (PAL, NTSC)
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111 if (gp2x_memregs[0x2818>>1] == 287) //PAL
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112 escalah=274.0; // RGB Vert TV PAL
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113 else if (gp2x_memregs[0x2818>>1] == 239) //NTSC
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114 escalah=331.0; // RGB Vert TV NTSC
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117 // scale horizontal
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118 gp2x_memregs[0x2906>>1]=(unsigned short)((float)escalaw *(W/320.0));
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120 gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah *bpp *(H/240.0));
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124 /* LCD updates @ 80Hz? */
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125 void gp2x_video_wait_vsync(void)
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127 gp2x_memregs[0x2846>>1] = 0x20|2; //(gp2x_memregs[0x2846>>1] | 0x20) & ~2;
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128 while(!(gp2x_memregs[0x2846>>1] & 2));// usleep(1);
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132 void gp2x_memcpy_all_buffers(void *data, int offset, int len)
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134 memcpy((char *)gp2x_screens[0] + offset, data, len);
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135 memcpy((char *)gp2x_screens[1] + offset, data, len);
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136 memcpy((char *)gp2x_screens[2] + offset, data, len);
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137 memcpy((char *)gp2x_screens[3] + offset, data, len);
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141 void gp2x_memset_all_buffers(int offset, int byte, int len)
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143 memset((char *)gp2x_screens[0] + offset, byte, len);
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144 memset((char *)gp2x_screens[1] + offset, byte, len);
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145 memset((char *)gp2x_screens[2] + offset, byte, len);
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146 memset((char *)gp2x_screens[3] + offset, byte, len);
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150 unsigned long gp2x_joystick_read(int allow_usb_joy)
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153 unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);
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154 if(value==0xFD) value=0xFA;
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155 if(value==0xF7) value=0xEB;
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156 if(value==0xDF) value=0xAF;
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157 if(value==0x7F) value=0xBE;
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158 value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));
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160 if (allow_usb_joy && num_of_joys > 0) {
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161 // check the usb joy as well..
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162 gp2x_usbjoy_update();
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163 for (i = 0; i < num_of_joys; i++)
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164 value |= gp2x_usbjoy_check(i);
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170 static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
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172 void gp2x_start_sound(int rate, int bits, int stereo)
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174 int frag = 0, bsize, buffers;
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176 // if no settings change, we don't need to do anything
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177 if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;
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179 if (sounddev > 0) close(sounddev);
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180 sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);
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181 if (sounddev == -1)
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182 printf("open(\"/dev/dsp\") failed with %i\n", errno);
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184 ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
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185 ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
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186 ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
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187 // calculate buffer size
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190 if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding
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191 while ((bsize>>=1)) frag++;
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192 frag |= buffers<<16; // 16 buffers
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193 ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
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194 printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",
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195 rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));
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197 s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;
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202 void gp2x_sound_write(void *buff, int len)
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204 write(sounddev, buff, len);
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207 void gp2x_sound_sync(void)
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209 ioctl(sounddev, SOUND_PCM_SYNC, 0);
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212 void gp2x_sound_volume(int l, int r)
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214 l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;
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216 ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/
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221 void Pause940(int yes)
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224 gp2x_memregs[0x0904>>1] &= 0xFFFE;
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226 gp2x_memregs[0x0904>>1] |= 1;
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230 void Reset940(int yes, int bank)
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232 gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03); /* bank=3 */
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238 void gp2x_init(void)
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240 printf("entering init()\n"); fflush(stdout);
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242 memdev = open("/dev/mem", O_RDWR);
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245 printf("open(\"/dev/mem\") failed with %i\n", errno);
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249 gp2x_memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);
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250 printf("memregs are @ %p\n", gp2x_memregs);
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251 if(gp2x_memregs == MAP_FAILED)
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253 printf("mmap(memregs) failed with %i\n", errno);
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256 gp2x_memregl = (unsigned long *) gp2x_memregs;
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258 gp2x_screens[3] = mmap(0, 640*480*4, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR3);
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259 if(gp2x_screens[3] == MAP_FAILED)
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261 printf("mmap(gp2x_screen) failed with %i\n", errno);
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264 printf("framebuffers point to %p\n", gp2x_screens[3]);
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265 gp2x_screens[2] = (char *) gp2x_screens[3]+640*480;
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266 gp2x_screens[1] = (char *) gp2x_screens[2]+640*480;
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267 gp2x_screens[0] = (char *) gp2x_screens[1]+640*480;
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269 gp2x_screen = gp2x_screens[0];
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273 mixerdev = open("/dev/mixer", O_RDWR);
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274 if (mixerdev == -1)
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275 printf("open(\"/dev/mixer\") failed with %i\n", errno);
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277 /* init usb joys -GnoStiC */
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278 gp2x_usbjoy_init();
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280 printf("exitting init()\n"); fflush(stdout);
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283 char *ext_menu = 0, *ext_state = 0;
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285 void gp2x_deinit(void)
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290 gp2x_video_changemode(15);
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291 munmap(gp2x_screens[0], 640*480*4);
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292 munmap((void *)gp2x_memregs, 0x10000);
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295 if (sounddev > 0) close(sounddev);
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297 gp2x_usbjoy_deinit();
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299 printf("all done, running ");
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301 // Zaq121's alternative frontend support from MAME
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302 if(ext_menu && ext_state) {
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303 printf("%s -state %s\n", ext_menu, ext_state);
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304 execl(ext_menu, ext_menu, "-state", ext_state, NULL);
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305 } else if(ext_menu) {
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306 printf("%s\n", ext_menu);
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307 execl(ext_menu, ext_menu, NULL);
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309 printf("gp2xmenu\n");
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310 chdir("/usr/gp2x");
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311 execl("gp2xmenu", "gp2xmenu", NULL);
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