2 * \file drv_bochsvbe.c
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3 * \brief BGA (Bochs Graphic Adapter) Driver
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4 * \note for AcessOS Version 1
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5 * \warning This driver does NOT support the Bochs PCI VGA driver
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10 #include <fs_devfs.h>
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11 #include <drv_pci.h>
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12 #include <tpl_drv_video.h>
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16 # define DEBUGS(v...) SysDebug(v)
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18 # define DEBUGS(v...)
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21 //#define INT static
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33 // === CONSTANTS ===
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37 #define BGA_LFB_MAXSIZE (1024*768*4)
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38 #define VBE_DISPI_BANK_ADDRESS 0xA0000
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39 #define VBE_DISPI_LFB_PHYSICAL_ADDRESS 0xE0000000
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40 #define VBE_DISPI_IOPORT_INDEX 0x01CE
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41 #define VBE_DISPI_IOPORT_DATA 0x01CF
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42 #define VBE_DISPI_DISABLED 0x00
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43 #define VBE_DISPI_ENABLED 0x01
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44 #define VBE_DISPI_LFB_ENABLED 0x40
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45 #define VBE_DISPI_NOCLEARMEM 0x80
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48 VBE_DISPI_INDEX_XRES,
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49 VBE_DISPI_INDEX_YRES,
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50 VBE_DISPI_INDEX_BPP,
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51 VBE_DISPI_INDEX_ENABLE,
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52 VBE_DISPI_INDEX_BANK,
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53 VBE_DISPI_INDEX_VIRT_WIDTH,
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54 VBE_DISPI_INDEX_VIRT_HEIGHT,
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55 VBE_DISPI_INDEX_X_OFFSET,
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56 VBE_DISPI_INDEX_Y_OFFSET
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60 // === PROTOTYPES ===
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62 int BGA_Install(char **Arguments);
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63 void BGA_Uninstall();
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65 void BGA_int_WriteRegister(Uint16 reg, Uint16 value);
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66 Uint16 BGA_int_ReadRegister(Uint16 reg);
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67 void BGA_int_SetBank(Uint16 bank);
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68 void BGA_int_SetMode(Uint16 width, Uint16 height);
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69 int BGA_int_UpdateMode(int id);
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70 int BGA_int_FindMode(tVideo_IOCtl_Mode *info);
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71 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info);
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72 int BGA_int_MapFB(void *Dest);
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74 Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer);
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75 Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer);
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76 int BGA_Ioctl(tVFS_Node *node, int id, void *data);
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79 MODULE_DEFINE(0, 0x0032, BochsVBE, BGA_Install, NULL, NULL);
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80 tDevFS_Driver gBGA_DriverStruct = {
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88 int giBGA_CurrentMode = -1;
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89 int giBGA_DriverId = -1;
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90 Uint *gBGA_Framebuffer;
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91 t_bga_mode gBGA_Modes[] = {
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93 { 80,25, 32, MODEFLAG_TEXT, 80*25*8}, // 640 x 480
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94 {100,37, 32, MODEFLAG_TEXT, 100*37*8}, // 800 x 600
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95 {640,480,8, 0, 640*480},
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96 {640,480,32, 0, 640*480*4},
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97 {800,600,8, 0, 800*600},
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98 {800,600,32, 0, 800*600*4},
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100 #define BGA_MODE_COUNT (sizeof(gBGA_Modes)/sizeof(gBGA_Modes[0]))
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104 * \fn int BGA_Install(char **Arguments)
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106 int BGA_Install(char **Arguments)
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108 int bga_version = 0;
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110 // Check BGA Version
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111 bga_version = BGA_int_ReadRegister(VBE_DISPI_INDEX_ID);
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112 // NOTE: This driver was written for 0xB0C4, but they seem to be backwards compatable
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113 if(bga_version < 0xB0C4 || bga_version > 0xB0C5) {
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114 Warning("[BGA ] Bochs Adapter Version is not 0xB0C4 or 0xB0C5, instead 0x%x", bga_version);
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119 giBGA_DriverId = DevFS_AddDevice( &gBGA_DriverStruct );
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120 if(giBGA_DriverId == -1) {
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121 Warning("[BGA ] Unable to register with DevFS, maybe already loaded?");
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125 // Map Framebuffer to hardware address
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126 gBGA_Framebuffer = (void *) MM_MapHWPage(VBE_DISPI_LFB_PHYSICAL_ADDRESS, 768); // 768 pages (3Mb)
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132 * \fn void BGA_Uninstall()
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134 void BGA_Uninstall()
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136 //DevFS_DelDevice( giBGA_DriverId );
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137 MM_UnmapHWPage( VBE_DISPI_LFB_PHYSICAL_ADDRESS, 768 );
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141 * \fn Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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142 * \brief Read from the framebuffer
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144 Uint64 BGA_Read(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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147 if(giBGA_CurrentMode == -1) return -1;
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149 // Check Offset and Length against Framebuffer Size
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150 if(off+len > gBGA_Modes[giBGA_CurrentMode].fbSize)
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153 // Copy from Framebuffer
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154 memcpy(buffer, (void*)((Uint)gBGA_Framebuffer + (Uint)off), len);
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159 * \fn Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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160 * \brief Write to the framebuffer
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162 Uint64 BGA_Write(tVFS_Node *node, Uint64 off, Uint64 len, void *buffer)
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164 ENTER("xoff xlen", off, len);
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167 if(giBGA_CurrentMode == -1) {
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172 // Check Input against Frambuffer Size
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173 if(off+len > gBGA_Modes[giBGA_CurrentMode].fbSize) {
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179 if( gBGA_Modes[giBGA_CurrentMode].flags & MODEFLAG_TEXT )
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181 tVT_Char *chars = buffer;
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182 int pitch = gBGA_Modes[giBGA_CurrentMode].width * giVT_CharWidth;
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184 dest = (void*)gBGA_Framebuffer;
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185 dest += off * giVT_CharWidth;
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186 len /= sizeof(tVT_Char);
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192 VT_Colour12to24(chars->BGCol),
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193 VT_Colour12to24(chars->FGCol)
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195 dest += giVT_CharWidth;
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201 Uint8 *destBuf = (Uint8*) ((Uint)gBGA_Framebuffer + (Uint)off);
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203 LOG("buffer = %p\n", buffer);
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204 LOG("Updating Framebuffer (%p to %p)\n",
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205 destBuf, destBuf + (Uint)len);
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208 // Copy to Frambuffer
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209 memcpy(destBuf, buffer, len);
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211 LOG("BGA Framebuffer updated\n");
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219 * \fn INT int BGA_Ioctl(tVFS_Node *node, int id, void *data)
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220 * \brief Handle messages to the device
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222 INT int BGA_Ioctl(tVFS_Node *node, int id, void *data)
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225 ENTER("pNode iId pData", node, id, data);
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229 case DRV_IOCTL_TYPE:
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230 ret = DRV_TYPE_VIDEO;
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232 case DRV_IOCTL_IDENT:
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233 memcpy(data, "BGA1", 4);
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236 case DRV_IOCTL_VERSION:
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239 case DRV_IOCTL_LOOKUP: // TODO: Implement
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243 case VIDEO_IOCTL_SETMODE:
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244 ret = BGA_int_UpdateMode(*(int*)(data));
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247 case VIDEO_IOCTL_GETMODE:
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248 ret = giBGA_CurrentMode;
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251 case VIDEO_IOCTL_FINDMODE:
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252 ret = BGA_int_FindMode((tVideo_IOCtl_Mode*)data);
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255 case VIDEO_IOCTL_MODEINFO:
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256 ret = BGA_int_ModeInfo((tVideo_IOCtl_Mode*)data);
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259 // Request Access to LFB
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260 case VIDEO_IOCTL_REQLFB:
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261 ret = BGA_int_MapFB( *(void**)data );
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273 //== Internal Functions ==
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275 * \fn void BGA_int_WriteRegister(Uint16 reg, Uint16 value)
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276 * \brief Writes to a BGA register
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278 void BGA_int_WriteRegister(Uint16 reg, Uint16 value)
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280 outw(VBE_DISPI_IOPORT_INDEX, reg);
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281 outw(VBE_DISPI_IOPORT_DATA, value);
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284 INT Uint16 BGA_int_ReadRegister(Uint16 reg)
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286 outw(VBE_DISPI_IOPORT_INDEX, reg);
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287 return inw(VBE_DISPI_IOPORT_DATA);
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291 INT void BGA_int_SetBank(Uint16 bank)
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293 BGA_int_WriteRegister(VBE_DISPI_INDEX_BANK, bank);
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298 * \fn void BGA_int_SetMode(Uint16 width, Uint16 height, Uint16 bpp)
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299 * \brief Sets the video mode from the dimensions and bpp given
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301 void BGA_int_SetMode(Uint16 width, Uint16 height)
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303 DEBUGS("BGA_int_SetMode: (width=%i, height=%i, bpp=%i)\n", width, height, bpp);
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304 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED);
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305 BGA_int_WriteRegister(VBE_DISPI_INDEX_XRES, width);
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306 BGA_int_WriteRegister(VBE_DISPI_INDEX_YRES, height);
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307 BGA_int_WriteRegister(VBE_DISPI_INDEX_BPP, 32);
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308 BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_NOCLEARMEM | VBE_DISPI_LFB_ENABLED);
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309 //BGA_int_WriteRegister(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_NOCLEARMEM);
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313 * \fn int BGA_int_UpdateMode(int id)
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314 * \brief Set current vide mode given a mode id
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316 int BGA_int_UpdateMode(int id)
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319 if(id < 0 || id >= BGA_MODE_COUNT) return -1;
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321 // Check if it is a text mode
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322 if( gBGA_Modes[id].flags & MODEFLAG_TEXT )
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324 gBGA_Modes[id].width*giVT_CharWidth,
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325 gBGA_Modes[id].height*giVT_CharHeight);
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328 gBGA_Modes[id].width,
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329 gBGA_Modes[id].height);
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331 giBGA_CurrentMode = id;
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336 * \fn int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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337 * \brief Find a mode matching the given options
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339 int BGA_int_FindMode(tVideo_IOCtl_Mode *info)
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342 int best = -1, bestFactor = 1000;
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344 int rqdProduct = info->width * info->height * info->bpp;
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346 DEBUGS("BGA_int_FindMode: (info={width:%i,height:%i,bpp:%i})\n", info->width, info->height, info->bpp);
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348 for(i = 0; i < BGA_MODE_COUNT; i++)
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351 LogF("Mode %i (%ix%ix%i), ", i, gBGA_Modes[i].width, gBGA_Modes[i].height, gBGA_Modes[i].bpp);
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354 if(gBGA_Modes[i].width == info->width
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355 && gBGA_Modes[i].height == info->height
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356 && gBGA_Modes[i].bpp == info->bpp)
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359 LogF("Perfect!\n");
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365 tmp = gBGA_Modes[i].width * gBGA_Modes[i].height * gBGA_Modes[i].bpp;
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367 tmp = tmp < 0 ? -tmp : tmp;
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368 factor = tmp * 100 / rqdProduct;
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371 LogF("factor = %i\n", factor);
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374 if(factor < bestFactor)
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376 bestFactor = factor;
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381 info->width = gBGA_Modes[best].width;
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382 info->height = gBGA_Modes[best].height;
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383 info->bpp = gBGA_Modes[best].bpp;
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388 * \fn int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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389 * \brief Get mode information
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391 int BGA_int_ModeInfo(tVideo_IOCtl_Mode *info)
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393 if(!info) return -1;
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394 if(MM_GetPhysAddr((Uint)info) == 0)
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397 if(info->id < 0 || info->id >= BGA_MODE_COUNT) return -1;
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399 info->width = gBGA_Modes[info->id].width;
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400 info->height = gBGA_Modes[info->id].height;
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401 info->bpp = gBGA_Modes[info->id].bpp;
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407 * \fn int BGA_int_MapFB(void *Dest)
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408 * \brief Map the framebuffer into a process's space
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409 * \param Dest User address to load to
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411 int BGA_int_MapFB(void *Dest)
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417 if((Uint)Dest > 0xC0000000) return 0;
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418 if(gBGA_Modes[giBGA_CurrentMode].bpp < 15) return 0; // Only non-pallete modes are supported
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420 // Count required pages
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421 pages = (gBGA_Modes[giBGA_CurrentMode].fbSize + 0xFFF) >> 12;
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423 // Check if there is space
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424 for( i = 0; i < pages; i++ )
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426 if(MM_GetPhysAddr( (Uint)Dest + (i << 12) ))
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431 for( i = 0; i < pages; i++ )
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432 MM_Map( (Uint)Dest + (i<<12), VBE_DISPI_LFB_PHYSICAL_ADDRESS + (i<<12) );
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