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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28 #include <sys/mman.h>
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29 #include <sys/types.h>
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30 #include <sys/stat.h>
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31 #include <sys/ioctl.h>
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32 #include <sys/soundcard.h>
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38 #include "../common/arm_utils.h"
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40 volatile unsigned short *gp2x_memregs;
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42 volatile unsigned long *gp2x_memregl;
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43 static void *gp2x_screens[4];
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44 static int screensel = 0;
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47 static int sounddev = 0, mixerdev = 0;
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51 #define FRAMEBUFF_WHOLESIZE (0x30000*4) // 320*240*2 + some more
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52 #define FRAMEBUFF_ADDR0 (0x4000000-FRAMEBUFF_WHOLESIZE)
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53 #define FRAMEBUFF_ADDR1 (FRAMEBUFF_ADDR0+0x30000)
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54 #define FRAMEBUFF_ADDR2 (FRAMEBUFF_ADDR1+0x30000)
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55 #define FRAMEBUFF_ADDR3 (FRAMEBUFF_ADDR2+0x30000)
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57 static const int gp2x_screenaddrs[4] = { FRAMEBUFF_ADDR0, FRAMEBUFF_ADDR1, FRAMEBUFF_ADDR2, FRAMEBUFF_ADDR3 };
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58 static int gp2x_screenaddrs_use[4];
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59 static unsigned short gp2x_screenaddr_old[4];
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63 void gp2x_video_flip(void)
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65 unsigned short lsw = (unsigned short) gp2x_screenaddrs_use[screensel&3];
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66 unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&3] >> 16);
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68 gp2x_memregs[0x2910>>1] = msw;
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69 gp2x_memregs[0x2914>>1] = msw;
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70 gp2x_memregs[0x290E>>1] = lsw;
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71 gp2x_memregs[0x2912>>1] = lsw;
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73 // jump to other buffer:
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74 gp2x_screen = gp2x_screens[++screensel&3];
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77 /* doulblebuffered flip */
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78 void gp2x_video_flip2(void)
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80 unsigned short msw = (unsigned short)(gp2x_screenaddrs_use[screensel&1] >> 16);
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82 gp2x_memregs[0x2910>>1] = msw;
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83 gp2x_memregs[0x2914>>1] = msw;
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84 gp2x_memregs[0x290E>>1] = 0;
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85 gp2x_memregs[0x2912>>1] = 0;
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87 // jump to other buffer:
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88 gp2x_screen = gp2x_screens[++screensel&1];
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92 void gp2x_video_changemode2(int bpp)
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94 gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/
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95 gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/
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99 void gp2x_video_changemode(int bpp)
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101 gp2x_video_changemode2(bpp);
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103 gp2x_memset_all_buffers(0, 0, 320*240*2);
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108 void gp2x_video_setpalette(int *pal, int len)
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110 unsigned short *g=(unsigned short *)pal;
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111 volatile unsigned short *memreg = &gp2x_memregs[0x295A>>1];
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112 gp2x_memregs[0x2958>>1] = 0;
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115 while(len--) *memreg=*g++;
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119 // TV Compatible function //
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120 void gp2x_video_RGB_setscaling(int ln_offs, int W, int H)
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122 float escalaw, escalah;
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123 int bpp = (gp2x_memregs[0x28DA>>1]>>9)&0x3;
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124 unsigned short scalw;
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127 gp2x_screenaddrs_use[0] = gp2x_screenaddrs[0] + ln_offs * 320 * bpp;
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128 gp2x_screenaddrs_use[1] = gp2x_screenaddrs[1] + ln_offs * 320 * bpp;
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129 gp2x_screenaddrs_use[2] = gp2x_screenaddrs[2] + ln_offs * 320 * bpp;
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130 gp2x_screenaddrs_use[3] = gp2x_screenaddrs[3] + ln_offs * 320 * bpp;
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132 escalaw = 1024.0; // RGB Horiz LCD
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133 escalah = 320.0; // RGB Vert LCD
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135 if(gp2x_memregs[0x2800>>1]&0x100) //TV-Out
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137 escalaw=489.0; // RGB Horiz TV (PAL, NTSC)
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138 if (gp2x_memregs[0x2818>>1] == 287) //PAL
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139 escalah=274.0; // RGB Vert TV PAL
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140 else if (gp2x_memregs[0x2818>>1] == 239) //NTSC
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141 escalah=331.0; // RGB Vert TV NTSC
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144 // scale horizontal
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145 scalw = (unsigned short)((float)escalaw *(W/320.0));
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146 /* if there is no horizontal scaling, vertical doesn't work. Here is a nasty wrokaround... */
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147 if (H != 240 && W == 320) scalw--;
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148 gp2x_memregs[0x2906>>1]=scalw;
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150 gp2x_memregl[0x2908>>2]=(unsigned long)((float)escalah *bpp *(H/240.0));
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154 void gp2x_video_wait_vsync(void)
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156 unsigned short v = gp2x_memregs[0x1182>>1];
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157 while (!((v ^ gp2x_memregs[0x1182>>1]) & 0x10)) spend_cycles(1024);
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161 void gp2x_video_flush_cache(void)
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163 // since we are using the mmu hack, we must flush the cache first
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164 // (the params are most likely wrong, but they seem to work somehow)
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165 //flushcache(addr, addr + 320*240*2, 0);
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166 flushcache(gp2x_screen, (char *)gp2x_screen + 320*240*2, 0);
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170 void gp2x_memcpy_buffers(int buffers, void *data, int offset, int len)
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173 if (buffers & (1<<0)) { dst = (char *)gp2x_screens[0] + offset; if (dst != data) memcpy(dst, data, len); }
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174 if (buffers & (1<<1)) { dst = (char *)gp2x_screens[1] + offset; if (dst != data) memcpy(dst, data, len); }
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175 if (buffers & (1<<2)) { dst = (char *)gp2x_screens[2] + offset; if (dst != data) memcpy(dst, data, len); }
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176 if (buffers & (1<<3)) { dst = (char *)gp2x_screens[3] + offset; if (dst != data) memcpy(dst, data, len); }
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180 void gp2x_memcpy_all_buffers(void *data, int offset, int len)
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182 gp2x_memcpy_buffers(0xf, data, offset, len);
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186 void gp2x_memset_all_buffers(int offset, int byte, int len)
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188 memset((char *)gp2x_screens[0] + offset, byte, len);
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189 memset((char *)gp2x_screens[1] + offset, byte, len);
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190 memset((char *)gp2x_screens[2] + offset, byte, len);
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191 memset((char *)gp2x_screens[3] + offset, byte, len);
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195 void gp2x_pd_clone_buffer2(void)
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197 memcpy(gp2x_screen, gp2x_screens[2], 320*240*2);
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201 unsigned long gp2x_joystick_read(int allow_usb_joy)
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204 unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);
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205 if(value==0xFD) value=0xFA;
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206 if(value==0xF7) value=0xEB;
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207 if(value==0xDF) value=0xAF;
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208 if(value==0x7F) value=0xBE;
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209 value = ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));
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211 if (allow_usb_joy && num_of_joys > 0) {
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212 // check the usb joy as well..
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213 gp2x_usbjoy_update();
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214 for (i = 0; i < num_of_joys; i++)
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215 value |= gp2x_usbjoy_check(i);
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221 static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
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223 void gp2x_start_sound(int rate, int bits, int stereo)
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225 int frag = 0, bsize, buffers;
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227 // if no settings change, we don't need to do anything
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228 if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo) return;
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230 if (sounddev > 0) close(sounddev);
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231 sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);
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232 if (sounddev == -1)
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233 printf("open(\"/dev/dsp\") failed with %i\n", errno);
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235 ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
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236 ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
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237 ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
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238 // calculate buffer size
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241 if (rate > 22050) { bsize*=4; buffers*=2; } // 44k mode seems to be very demanding
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242 while ((bsize>>=1)) frag++;
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243 frag |= buffers<<16; // 16 buffers
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244 ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
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247 printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",
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248 rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));
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250 s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;
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254 void gp2x_sound_write(void *buff, int len)
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256 write(sounddev, buff, len);
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259 void gp2x_sound_sync(void)
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261 ioctl(sounddev, SOUND_PCM_SYNC, 0);
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264 void gp2x_sound_volume(int l, int r)
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266 l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;
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268 ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/
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273 void Pause940(int yes)
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276 gp2x_memregs[0x0904>>1] &= 0xFFFE;
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278 gp2x_memregs[0x0904>>1] |= 1;
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282 void Reset940(int yes, int bank)
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284 gp2x_memregs[0x3B48>>1] = ((yes&1) << 7) | (bank & 0x03);
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290 void gp2x_init(void)
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292 printf("entering init()\n"); fflush(stdout);
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294 memdev = open("/dev/mem", O_RDWR);
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297 printf("open(\"/dev/mem\") failed with %i\n", errno);
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301 gp2x_memregs = mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0xc0000000);
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302 printf("memregs are @ %p\n", gp2x_memregs);
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303 if(gp2x_memregs == MAP_FAILED)
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305 printf("mmap(memregs) failed with %i\n", errno);
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308 gp2x_memregl = (unsigned long *) gp2x_memregs;
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310 gp2x_screens[0] = mmap(0, FRAMEBUFF_WHOLESIZE, PROT_WRITE, MAP_SHARED, memdev, FRAMEBUFF_ADDR0);
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311 if(gp2x_screens[0] == MAP_FAILED)
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313 printf("mmap(gp2x_screen) failed with %i\n", errno);
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316 printf("framebuffers point to %p\n", gp2x_screens[0]);
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317 gp2x_screens[1] = (char *) gp2x_screens[0]+0x30000;
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318 gp2x_screens[2] = (char *) gp2x_screens[1]+0x30000;
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319 gp2x_screens[3] = (char *) gp2x_screens[2]+0x30000;
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321 gp2x_screen = gp2x_screens[0];
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324 gp2x_screenaddr_old[0] = gp2x_memregs[0x290E>>1];
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325 gp2x_screenaddr_old[1] = gp2x_memregs[0x2910>>1];
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326 gp2x_screenaddr_old[2] = gp2x_memregs[0x2912>>1];
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327 gp2x_screenaddr_old[3] = gp2x_memregs[0x2914>>1];
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329 memcpy(gp2x_screenaddrs_use, gp2x_screenaddrs, sizeof(gp2x_screenaddrs));
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330 gp2x_memset_all_buffers(0, 0, 320*240*2);
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333 mixerdev = open("/dev/mixer", O_RDWR);
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334 if (mixerdev == -1)
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335 printf("open(\"/dev/mixer\") failed with %i\n", errno);
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337 /* init usb joys -GnoStiC */
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338 gp2x_usbjoy_init();
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340 printf("exitting init()\n"); fflush(stdout);
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343 char *ext_menu = 0, *ext_state = 0;
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345 void gp2x_deinit(void)
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350 gp2x_video_changemode(15);
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351 gp2x_memregs[0x290E>>1] = gp2x_screenaddr_old[0];
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352 gp2x_memregs[0x2910>>1] = gp2x_screenaddr_old[1];
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353 gp2x_memregs[0x2912>>1] = gp2x_screenaddr_old[2];
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354 gp2x_memregs[0x2914>>1] = gp2x_screenaddr_old[3];
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356 munmap(gp2x_screens[0], FRAMEBUFF_WHOLESIZE);
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357 munmap((void *)gp2x_memregs, 0x10000);
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360 if (sounddev > 0) close(sounddev);
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362 gp2x_usbjoy_deinit();
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364 printf("all done, running ");
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366 // Zaq121's alternative frontend support from MAME
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367 if(ext_menu && ext_state) {
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368 printf("%s -state %s\n", ext_menu, ext_state);
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369 execl(ext_menu, ext_menu, "-state", ext_state, NULL);
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370 } else if(ext_menu) {
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371 printf("%s\n", ext_menu);
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372 execl(ext_menu, ext_menu, NULL);
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374 printf("gp2xmenu\n");
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375 chdir("/usr/gp2x");
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376 execl("gp2xmenu", "gp2xmenu", NULL);
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381 void lprintf(const char *fmt, ...)
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