2 * \file drv_bochsvbe.c
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3 * \brief BGA (Bochs Graphic Adapter) Driver
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5 * \warning This driver does NOT support the Bochs PCI VGA driver
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10 #include <modules.h>
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12 #include <fs_devfs.h>
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13 #include <drv_pci.h>
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14 #include <tpl_drv_video.h>
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16 //#define INT static
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28 // === CONSTANTS ===
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32 #define BGA_LFB_MAXSIZE (1024*768*4)
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33 #define VBE_DISPI_BANK_ADDRESS 0xA0000
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34 #define VBE_DISPI_LFB_PHYSICAL_ADDRESS 0xE0000000
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35 #define VBE_DISPI_IOPORT_INDEX 0x01CE
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36 #define VBE_DISPI_IOPORT_DATA 0x01CF
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37 #define VBE_DISPI_DISABLED 0x00
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38 #define VBE_DISPI_ENABLED 0x01
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39 #define VBE_DISPI_LFB_ENABLED 0x40
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40 #define VBE_DISPI_NOCLEARMEM 0x80
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43 VBE_DISPI_INDEX_XRES,
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44 VBE_DISPI_INDEX_YRES,
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45 VBE_DISPI_INDEX_BPP,
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46 VBE_DISPI_INDEX_ENABLE,
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47 VBE_DISPI_INDEX_BANK,
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48 VBE_DISPI_INDEX_VIRT_WIDTH,
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49 VBE_DISPI_INDEX_VIRT_HEIGHT,
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50 VBE_DISPI_INDEX_X_OFFSET,
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51 VBE_DISPI_INDEX_Y_OFFSET
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55 // === PROTOTYPES ===
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57 int BGA_Install(char **Arguments);
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58 void BGA_Uninstall();
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60 void BGA_int_WriteRegister(Uint16 reg, Uint16 value);
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61 Uint16 BGA_int_ReadRegister(Uint16 reg);
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62 void BGA_int_SetBank(Uint16 bank);
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63 void BGA_int_SetMode(Uint16 width, Uint16 height);
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64 int BGA_int_UpdateMode(int id);
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65 int BGA_int_FindMode(tVideo_IOCtl_Mode *info);
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66 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info);
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67 int BGA_int_MapFB(void *Dest);
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69 Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer);
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70 Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer);
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71 int BGA_Ioctl(tVFS_Node *node, int id, void *data);
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74 MODULE_DEFINE(0, 0x0032, BochsVBE, BGA_Install, NULL, NULL);
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75 tDevFS_Driver gBGA_DriverStruct = {
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83 int giBGA_CurrentMode = -1;
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84 int giBGA_DriverId = -1;
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85 Uint *gBGA_Framebuffer;
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86 t_bga_mode gBGA_Modes[] = {
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88 { 80,25, 12, MODEFLAG_TEXT, 80*25*8}, // 640 x 480
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89 {100,37, 12, MODEFLAG_TEXT, 100*37*8}, // 800 x 600
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90 {640,480,8, 0, 640*480},
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91 {640,480,32, 0, 640*480*4},
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92 {800,600,8, 0, 800*600},
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93 {800,600,32, 0, 800*600*4},
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95 #define BGA_MODE_COUNT (sizeof(gBGA_Modes)/sizeof(gBGA_Modes[0]))
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99 * \fn int BGA_Install(char **Arguments)
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101 int BGA_Install(char **Arguments)
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103 int bga_version = 0;
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105 // Check BGA Version
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106 bga_version = BGA_int_ReadRegister(VBE_DISPI_INDEX_ID);
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107 // NOTE: This driver was written for 0xB0C4, but they seem to be backwards compatable
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108 if(bga_version < 0xB0C4 || bga_version > 0xB0C5) {
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109 Warning("[BGA ] Bochs Adapter Version is not 0xB0C4 or 0xB0C5, instead 0x%x", bga_version);
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114 giBGA_DriverId = DevFS_AddDevice( &gBGA_DriverStruct );
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115 if(giBGA_DriverId == -1) {
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116 Warning("[BGA ] Unable to register with DevFS, maybe already loaded?");
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120 // Map Framebuffer to hardware address
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121 gBGA_Framebuffer = (void *) MM_MapHWPage(VBE_DISPI_LFB_PHYSICAL_ADDRESS, 768); // 768 pages (3Mb)
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127 * \fn void BGA_Uninstall()
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129 void BGA_Uninstall()
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131 //DevFS_DelDevice( giBGA_DriverId );
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132 MM_UnmapHWPage( VBE_DISPI_LFB_PHYSICAL_ADDRESS, 768 );
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136 * \fn Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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137 * \brief Read from the framebuffer
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139 Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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142 if(giBGA_CurrentMode == -1) return -1;
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144 // Check Offset and Length against Framebuffer Size
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145 if(off+len > gBGA_Modes[giBGA_CurrentMode].fbSize)
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148 // Copy from Framebuffer
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149 memcpy(buffer, (void*)((Uint)gBGA_Framebuffer + (Uint)off), len);
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154 * \fn Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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155 * \brief Write to the framebuffer
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157 Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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159 ENTER("xoff xlen", off, len);
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162 if(giBGA_CurrentMode == -1) {
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167 // Check Input against Frambuffer Size
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168 if(off+len > gBGA_Modes[giBGA_CurrentMode].fbSize) {
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174 if( gBGA_Modes[giBGA_CurrentMode].flags & MODEFLAG_TEXT )
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176 tVT_Char *chars = buffer;
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177 int pitch = gBGA_Modes[giBGA_CurrentMode].width * giVT_CharWidth;
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179 off /= sizeof(tVT_Char);
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180 dest = (void*)gBGA_Framebuffer;
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181 dest += (off / gBGA_Modes[giBGA_CurrentMode].width) * giVT_CharHeight * pitch;
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182 dest += (off % gBGA_Modes[giBGA_CurrentMode].width) * giVT_CharWidth;
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183 len /= sizeof(tVT_Char);
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189 VT_Colour12to24(chars->BGCol),
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190 VT_Colour12to24(chars->FGCol)
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192 dest += giVT_CharWidth;
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198 Uint8 *destBuf = (Uint8*) ((Uint)gBGA_Framebuffer + (Uint)off);
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200 LOG("buffer = %p\n", buffer);
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201 LOG("Updating Framebuffer (%p to %p)\n",
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202 destBuf, destBuf + (Uint)len);
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205 // Copy to Frambuffer
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206 memcpy(destBuf, buffer, len);
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208 LOG("BGA Framebuffer updated\n");
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216 * \fn INT int BGA_Ioctl(tVFS_Node *node, int id, void *data)
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217 * \brief Handle messages to the device
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219 INT int BGA_Ioctl(tVFS_Node *node, int id, void *data)
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222 ENTER("pNode iId pData", node, id, data);
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226 case DRV_IOCTL_TYPE:
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227 ret = DRV_TYPE_VIDEO;
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229 case DRV_IOCTL_IDENT:
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230 memcpy(data, "BGA1", 4);
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233 case DRV_IOCTL_VERSION:
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236 case DRV_IOCTL_LOOKUP: // TODO: Implement
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240 case VIDEO_IOCTL_SETMODE:
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241 ret = BGA_int_UpdateMode(*(int*)(data));
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244 case VIDEO_IOCTL_GETMODE:
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245 ret = giBGA_CurrentMode;
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248 case VIDEO_IOCTL_FINDMODE:
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249 ret = BGA_int_FindMode((tVideo_IOCtl_Mode*)data);
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252 case VIDEO_IOCTL_MODEINFO:
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253 ret = BGA_int_ModeInfo((tVideo_IOCtl_Mode*)data);
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256 // Request Access to LFB
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257 case VIDEO_IOCTL_REQLFB:
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258 ret = BGA_int_MapFB( *(void**)data );
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270 //== Internal Functions ==
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272 * \fn void BGA_int_WriteRegister(Uint16 reg, Uint16 value)
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273 * \brief Writes to a BGA register
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275 void BGA_int_WriteRegister(Uint16 reg, Uint16 value)
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277 outw(VBE_DISPI_IOPORT_INDEX, reg);
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278 outw(VBE_DISPI_IOPORT_DATA, value);
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281 INT Uint16 BGA_int_ReadRegister(Uint16 reg)
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283 outw(VBE_DISPI_IOPORT_INDEX, reg);
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284 return inw(VBE_DISPI_IOPORT_DATA);
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288 INT void BGA_int_SetBank(Uint16 bank)
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290 BGA_int_WriteRegister(VBE_DISPI_INDEX_BANK, bank);
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295 * \fn void BGA_int_SetMode(Uint16 width, Uint16 height, Uint16 bpp)
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296 * \brief Sets the video mode from the dimensions and bpp given
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298 void BGA_int_SetMode(Uint16 width, Uint16 height)
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300 ENTER("iwidth iheight ibpp", width, height, bpp);
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301 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
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302 BGA_int_WriteRegister(VBE_DISPI_INDEX_XRES, width);
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303 BGA_int_WriteRegister(VBE_DISPI_INDEX_YRES, height);
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304 BGA_int_WriteRegister(VBE_DISPI_INDEX_BPP, 32);
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305 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_NOCLEARMEM | VBE_DISPI_LFB_ENABLED);
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306 //BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_NOCLEARMEM);
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311 * \fn int BGA_int_UpdateMode(int id)
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312 * \brief Set current vide mode given a mode id
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314 int BGA_int_UpdateMode(int id)
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317 if(id < 0 || id >= BGA_MODE_COUNT) return -1;
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319 // Check if it is a text mode
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320 if( gBGA_Modes[id].flags & MODEFLAG_TEXT )
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322 gBGA_Modes[id].width*giVT_CharWidth,
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323 gBGA_Modes[id].height*giVT_CharHeight);
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326 gBGA_Modes[id].width,
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327 gBGA_Modes[id].height);
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329 giBGA_CurrentMode = id;
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334 * \fn int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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335 * \brief Find a mode matching the given options
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337 int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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340 int best = 0, bestFactor = 1000;
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342 int rqdProduct = info->width * info->height * info->bpp;
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344 ENTER("pinfo", info);
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345 LOG("info = {width:%i,height:%i,bpp:%i})\n", info->width, info->height, info->bpp);
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347 for(i = 0; i < BGA_MODE_COUNT; i++)
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350 LogF("Mode %i (%ix%ix%i), ", i, gBGA_Modes[i].width, gBGA_Modes[i].height, gBGA_Modes[i].bpp);
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353 // Check if this mode is the same type as what we want
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354 if( !(gBGA_Modes[i].flags & MODEFLAG_TEXT) != !(info->flags & VIDEO_FLAG_TEXT) )
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357 // Ooh! A perfect match
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358 if(gBGA_Modes[i].width == info->width
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359 && gBGA_Modes[i].height == info->height
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360 && gBGA_Modes[i].bpp == info->bpp)
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363 LogF("Perfect!\n");
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369 // If not, how close are we?
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370 tmp = gBGA_Modes[i].width * gBGA_Modes[i].height * gBGA_Modes[i].bpp;
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372 tmp = tmp < 0 ? -tmp : tmp; // tmp = ABS(tmp)
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373 factor = tmp * 100 / rqdProduct;
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376 LogF("factor = %i\n", factor);
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379 if(factor < bestFactor)
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381 bestFactor = factor;
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387 info->width = gBGA_Modes[best].width;
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388 info->height = gBGA_Modes[best].height;
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389 info->bpp = gBGA_Modes[best].bpp;
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392 if(gBGA_Modes[best].flags & MODEFLAG_TEXT)
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393 info->flags |= VIDEO_FLAG_TEXT;
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399 * \fn int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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400 * \brief Get mode information
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402 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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405 //if( !MM_IsUser( (Uint)info, sizeof(tVideo_IOCtl_Mode) ) ) {
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409 if(info->id < 0 || info->id >= BGA_MODE_COUNT) return -1;
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411 info->width = gBGA_Modes[info->id].width;
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412 info->height = gBGA_Modes[info->id].height;
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413 info->bpp = gBGA_Modes[info->id].bpp;
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416 if(gBGA_Modes[info->id].flags & MODEFLAG_TEXT)
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417 info->flags |= VIDEO_FLAG_TEXT;
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423 * \fn int BGA_int_MapFB(void *Dest)
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424 * \brief Map the framebuffer into a process's space
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425 * \param Dest User address to load to
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427 int BGA_int_MapFB(void *Dest)
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433 if((Uint)Dest > 0xC0000000) return 0;
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434 if(gBGA_Modes[giBGA_CurrentMode].bpp < 15) return 0; // Only non-pallete modes are supported
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436 // Count required pages
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437 pages = (gBGA_Modes[giBGA_CurrentMode].fbSize + 0xFFF) >> 12;
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439 // Check if there is space
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440 for( i = 0; i < pages; i++ )
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442 if(MM_GetPhysAddr( (Uint)Dest + (i << 12) ))
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447 for( i = 0; i < pages; i++ )
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448 MM_Map( (Uint)Dest + (i<<12), VBE_DISPI_LFB_PHYSICAL_ADDRESS + (i<<12) );
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