2 * Acess2 Bochs graphics adapter Driver
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3 * - By John Hodge (thePowersGang)
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9 #define VERSION VER2(0,10)
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13 #include <modules.h>
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15 #include <fs_devfs.h>
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16 #include <drv_pci.h>
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17 #include <api_drv_video.h>
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20 typedef struct sBGA_Mode {
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27 // === CONSTANTS ===
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28 #define BGA_LFB_MAXSIZE (1024*768*4)
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29 #define VBE_DISPI_BANK_ADDRESS 0xA0000
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30 #define VBE_DISPI_LFB_PHYSICAL_ADDRESS 0xE0000000
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31 #define VBE_DISPI_IOPORT_INDEX 0x01CE
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32 #define VBE_DISPI_IOPORT_DATA 0x01CF
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33 #define VBE_DISPI_DISABLED 0x00
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34 #define VBE_DISPI_ENABLED 0x01
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35 #define VBE_DISPI_LFB_ENABLED 0x40
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36 #define VBE_DISPI_NOCLEARMEM 0x80
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39 VBE_DISPI_INDEX_XRES,
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40 VBE_DISPI_INDEX_YRES,
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41 VBE_DISPI_INDEX_BPP,
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42 VBE_DISPI_INDEX_ENABLE,
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43 VBE_DISPI_INDEX_BANK,
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44 VBE_DISPI_INDEX_VIRT_WIDTH,
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45 VBE_DISPI_INDEX_VIRT_HEIGHT,
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46 VBE_DISPI_INDEX_X_OFFSET,
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47 VBE_DISPI_INDEX_Y_OFFSET
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50 // === PROTOTYPES ===
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52 int BGA_Install(char **Arguments);
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53 void BGA_Uninstall();
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55 void BGA_int_WriteRegister(Uint16 reg, Uint16 value);
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56 Uint16 BGA_int_ReadRegister(Uint16 reg);
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57 void BGA_int_SetBank(Uint16 bank);
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58 void BGA_int_SetMode(Uint16 width, Uint16 height);
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59 int BGA_int_UpdateMode(int id);
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60 int BGA_int_FindMode(tVideo_IOCtl_Mode *info);
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61 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info);
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62 int BGA_int_MapFB(void *Dest);
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64 size_t BGA_Read(tVFS_Node *Node, off_t off, size_t len, void *buffer);
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65 size_t BGA_Write(tVFS_Node *Node, off_t off, size_t len, const void *buffer);
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66 int BGA_IOCtl(tVFS_Node *Node, int ID, void *Data);
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69 MODULE_DEFINE(0, VERSION, BochsGA, BGA_Install, NULL, "PCI", NULL);
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70 tVFS_NodeType gBGA_NodeType = {
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75 tDevFS_Driver gBGA_DriverStruct = {
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77 {.Type = &gBGA_NodeType}
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79 int giBGA_CurrentMode = -1;
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80 tVideo_IOCtl_Pos gBGA_CursorPos = {-1,-1};
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81 Uint *gBGA_Framebuffer;
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82 const tBGA_Mode *gpBGA_CurrentMode;
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83 const tBGA_Mode gBGA_Modes[] = {
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84 {640,480,32, 640*480*4},
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85 {800,600,32, 800*600*4},
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86 {1024,768,32, 1024*768*4}
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88 #define BGA_MODE_COUNT (sizeof(gBGA_Modes)/sizeof(gBGA_Modes[0]))
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89 tDrvUtil_Video_BufInfo gBGA_DrvUtil_BufInfo;
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93 * \fn int BGA_Install(char **Arguments)
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95 int BGA_Install(char **Arguments)
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101 // Check BGA Version
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102 version = BGA_int_ReadRegister(VBE_DISPI_INDEX_ID);
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103 LOG("version = 0x%x", version);
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104 if( version == 0xFFFF ) {
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105 // Floating bus, nothing there
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106 return MODULE_ERR_NOTNEEDED;
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109 // NOTE: This driver was written for BGA versions >= 0xBOC2
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110 // NOTE: However, Qemu is braindead and doesn't return the actual version
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111 if( version != 0xB0C0 && ((version & 0xFFF0) != 0xB0C0 || version < 0xB0C2) ) {
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112 Log_Warning("BGA", "Bochs Adapter Version is not compatible (need >= 0xB0C2), instead 0x%x", version);
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113 return MODULE_ERR_NOTNEEDED;
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116 // Get framebuffer base
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117 dev = PCI_GetDevice(0x1234, 0x1111, 0);
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119 base = VBE_DISPI_LFB_PHYSICAL_ADDRESS;
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121 base = PCI_GetBAR(dev, 0);
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123 // Map Framebuffer to hardware address
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124 gBGA_Framebuffer = (void *) MM_MapHWPages(base, 768); // 768 pages (3Mb)
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127 if( DevFS_AddDevice( &gBGA_DriverStruct ) == -1 )
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129 Log_Warning("BGA", "Unable to register with DevFS, maybe already loaded?");
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130 return MODULE_ERR_MISC;
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133 return MODULE_ERR_OK;
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137 * \brief Clean up driver resources before destruction
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139 void BGA_Uninstall(void)
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141 DevFS_DelDevice( &gBGA_DriverStruct );
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142 MM_UnmapHWPages( (tVAddr)gBGA_Framebuffer, 768 );
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146 * \brief Read from the framebuffer
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148 size_t BGA_Read(tVFS_Node *node, off_t off, size_t len, void *buffer)
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151 if(giBGA_CurrentMode == -1) return -1;
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153 // Check Offset and Length against Framebuffer Size
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154 if(off+len > gpBGA_CurrentMode->fbSize)
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157 // Copy from Framebuffer
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158 memcpy(buffer, (void*)((Uint)gBGA_Framebuffer + (Uint)off), len);
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163 * \brief Write to the framebuffer
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165 size_t BGA_Write(tVFS_Node *Node, off_t Offset, size_t Length, const void *Buffer)
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167 if( giBGA_CurrentMode == -1 ) BGA_int_UpdateMode(0);
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168 return DrvUtil_Video_WriteLFB(&gBGA_DrvUtil_BufInfo, Offset, Length, Buffer);
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171 const char *csaBGA_IOCtls[] = {DRV_IOCTLNAMES, DRV_VIDEO_IOCTLNAMES, NULL};
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173 * \brief Handle messages to the device
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175 int BGA_IOCtl(tVFS_Node *Node, int ID, void *Data)
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178 ENTER("pNode iId pData", Node, ID, Data);
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182 BASE_IOCTLS(DRV_TYPE_VIDEO, "BochsGA", VERSION, csaBGA_IOCtls);
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184 case VIDEO_IOCTL_GETSETMODE:
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185 if( Data ) BGA_int_UpdateMode(*(int*)(Data));
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186 ret = giBGA_CurrentMode;
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189 case VIDEO_IOCTL_FINDMODE:
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190 ret = BGA_int_FindMode((tVideo_IOCtl_Mode*)Data);
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193 case VIDEO_IOCTL_MODEINFO:
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194 ret = BGA_int_ModeInfo((tVideo_IOCtl_Mode*)Data);
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197 case VIDEO_IOCTL_SETBUFFORMAT:
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198 DrvUtil_Video_RemoveCursor( &gBGA_DrvUtil_BufInfo );
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199 ret = gBGA_DrvUtil_BufInfo.BufferFormat;
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201 gBGA_DrvUtil_BufInfo.BufferFormat = *(int*)Data;
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202 if(gBGA_DrvUtil_BufInfo.BufferFormat == VIDEO_BUFFMT_TEXT)
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203 DrvUtil_Video_SetCursor( &gBGA_DrvUtil_BufInfo, &gDrvUtil_TextModeCursor );
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206 case VIDEO_IOCTL_SETCURSOR:
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207 DrvUtil_Video_RemoveCursor( &gBGA_DrvUtil_BufInfo );
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208 gBGA_CursorPos.x = ((tVideo_IOCtl_Pos*)Data)->x;
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209 gBGA_CursorPos.y = ((tVideo_IOCtl_Pos*)Data)->y;
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210 if(gBGA_DrvUtil_BufInfo.BufferFormat == VIDEO_BUFFMT_TEXT)
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211 DrvUtil_Video_DrawCursor(
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212 &gBGA_DrvUtil_BufInfo,
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213 gBGA_CursorPos.x*giVT_CharWidth,
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214 gBGA_CursorPos.y*giVT_CharHeight
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217 DrvUtil_Video_DrawCursor(
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218 &gBGA_DrvUtil_BufInfo,
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219 gBGA_CursorPos.x, gBGA_CursorPos.y
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232 //== Internal Functions ==
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234 * \brief Writes to a BGA register
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236 void BGA_int_WriteRegister(Uint16 reg, Uint16 value)
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238 outw(VBE_DISPI_IOPORT_INDEX, reg);
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239 outw(VBE_DISPI_IOPORT_DATA, value);
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242 Uint16 BGA_int_ReadRegister(Uint16 reg)
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244 outw(VBE_DISPI_IOPORT_INDEX, reg);
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245 return inw(VBE_DISPI_IOPORT_DATA);
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249 * \brief Sets the video mode (32bpp only)
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251 void BGA_int_SetMode(Uint16 Width, Uint16 Height)
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253 ENTER("iWidth iHeight", Width, Height);
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254 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
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255 BGA_int_WriteRegister(VBE_DISPI_INDEX_XRES, Width);
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256 BGA_int_WriteRegister(VBE_DISPI_INDEX_YRES, Height);
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257 BGA_int_WriteRegister(VBE_DISPI_INDEX_BPP, 32);
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258 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_NOCLEARMEM | VBE_DISPI_LFB_ENABLED);
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263 * \fn int BGA_int_UpdateMode(int id)
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264 * \brief Set current vide mode given a mode id
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266 int BGA_int_UpdateMode(int id)
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269 if(id < 0 || id >= BGA_MODE_COUNT) return -1;
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272 gBGA_Modes[id].width,
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273 gBGA_Modes[id].height);
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275 gBGA_DrvUtil_BufInfo.Framebuffer = gBGA_Framebuffer;
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276 gBGA_DrvUtil_BufInfo.Pitch = gBGA_Modes[id].width * 4;
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277 gBGA_DrvUtil_BufInfo.Width = gBGA_Modes[id].width;
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278 gBGA_DrvUtil_BufInfo.Height = gBGA_Modes[id].height;
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279 gBGA_DrvUtil_BufInfo.Depth = gBGA_Modes[id].bpp;
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281 giBGA_CurrentMode = id;
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282 gpBGA_CurrentMode = &gBGA_Modes[id];
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287 * \fn int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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288 * \brief Find a mode matching the given options
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290 int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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293 int best = 0, bestFactor = 1000;
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295 int rqdProduct = info->width * info->height;
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297 ENTER("pinfo", info);
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298 LOG("info = {width:%i,height:%i,bpp:%i})\n", info->width, info->height, info->bpp);
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300 for(i = 0; i < BGA_MODE_COUNT; i++)
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303 LOG("Mode %i (%ix%i,%ibpp), ", i, gBGA_Modes[i].width, gBGA_Modes[i].height, gBGA_Modes[i].bpp);
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306 if( gBGA_Modes[i].bpp != info->bpp )
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309 // Ooh! A perfect match
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310 if(gBGA_Modes[i].width == info->width && gBGA_Modes[i].height == info->height)
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320 // If not, how close are we?
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321 tmp = gBGA_Modes[i].width * gBGA_Modes[i].height - rqdProduct;
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322 tmp = tmp < 0 ? -tmp : tmp; // tmp = ABS(tmp)
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325 LOG("tmp = %i", tmp);
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328 if(tmp < bestFactor)
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336 info->width = gBGA_Modes[best].width;
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337 info->height = gBGA_Modes[best].height;
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338 info->bpp = gBGA_Modes[best].bpp;
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345 * \fn int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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346 * \brief Get mode information
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348 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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351 //if( !MM_IsUser( (Uint)info, sizeof(tVideo_IOCtl_Mode) ) ) {
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355 if(info->id < 0 || info->id >= BGA_MODE_COUNT) return -1;
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357 info->width = gBGA_Modes[info->id].width;
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358 info->height = gBGA_Modes[info->id].height;
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359 info->bpp = gBGA_Modes[info->id].bpp;
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