3 * Video BIOS Extensions (Vesa) Driver
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6 #define VERSION 0x100
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10 #include <tpl_drv_video.h>
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11 #include <fs_devfs.h>
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12 #include <modules.h>
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16 // === CONSTANTS ===
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17 #define FLAG_LFB 0x1
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19 // === PROTOTYPES ===
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20 int Vesa_Install(char **Arguments);
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21 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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22 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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23 int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data);
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24 int Vesa_Int_SetMode(int Mode);
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25 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data);
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26 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data);
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29 MODULE_DEFINE(0, VERSION, Vesa, Vesa_Install, NULL, "PCI", "VM8086", NULL);
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30 tDevFS_Driver gVesa_DriverStruct = {
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34 .Write = Vesa_Write,
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38 tSpinlock glVesa_Lock;
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39 tVM8086 *gpVesa_BiosState;
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40 int giVesaCurrentMode = -1;
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41 int giVesaDriverId = -1;
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42 char *gVesaFramebuffer = (void*)0xC00A0000;
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43 tVesa_Mode *gVesa_Modes;
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44 int giVesaModeCount = 0;
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45 int giVesaPageCount = 0;
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48 int Vesa_Install(char **Arguments)
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50 tVesa_CallInfo *info;
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52 tVesa_CallModeInfo *modeinfo;
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53 tFarPtr modeinfoPtr;
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57 // Allocate Info Block
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58 gpVesa_BiosState = VM8086_Init();
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59 info = VM8086_Allocate(gpVesa_BiosState, 512, &infoPtr.seg, &infoPtr.ofs);
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60 modeinfo = VM8086_Allocate(gpVesa_BiosState, 512, &modeinfoPtr.seg, &modeinfoPtr.ofs);
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61 // Set Requested Version
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62 memcpy(info->signature, "VBE2", 4);
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64 gpVesa_BiosState->AX = 0x4F00;
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65 gpVesa_BiosState->ES = infoPtr.seg; gpVesa_BiosState->DI = infoPtr.ofs;
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67 VM8086_Int(gpVesa_BiosState, 0x10);
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68 if(gpVesa_BiosState->AX != 0x004F) {
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69 Log_Warning("Vesa", "Vesa_Install - VESA/VBE Unsupported (AX = 0x%x)\n", gpVesa_BiosState->AX);
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70 return MODULE_ERR_NOTNEEDED;
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73 modes = (Uint16 *) VM8086_GetPointer(gpVesa_BiosState, info->VideoModes.seg, info->VideoModes.ofs);
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76 for( giVesaModeCount = 1; modes[giVesaModeCount] != 0xFFFF; giVesaModeCount++ );
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77 gVesa_Modes = (tVesa_Mode *)malloc( giVesaModeCount * sizeof(tVesa_Mode) );
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80 gVesa_Modes[0].width = 80;
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81 gVesa_Modes[0].height = 25;
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82 gVesa_Modes[0].bpp = 4;
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83 gVesa_Modes[0].code = 0x3;
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85 for( i = 1; i < giVesaModeCount; i++ )
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87 gVesa_Modes[i].code = modes[i];
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89 gpVesa_BiosState->AX = 0x4F01;
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90 gpVesa_BiosState->CX = gVesa_Modes[i].code;
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91 gpVesa_BiosState->ES = modeinfoPtr.seg;
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92 gpVesa_BiosState->DI = modeinfoPtr.ofs;
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93 VM8086_Int(gpVesa_BiosState, 0x10);
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96 gVesa_Modes[i].flags = 0;
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97 if ( (modeinfo->attributes & 0x90) == 0x90 )
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99 gVesa_Modes[i].flags |= FLAG_LFB;
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100 gVesa_Modes[i].framebuffer = modeinfo->physbase;
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101 gVesa_Modes[i].fbSize = modeinfo->Xres*modeinfo->Yres*modeinfo->bpp/8;
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103 gVesa_Modes[i].framebuffer = 0;
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104 gVesa_Modes[i].fbSize = 0;
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107 gVesa_Modes[i].width = modeinfo->Xres;
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108 gVesa_Modes[i].height = modeinfo->Yres;
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109 gVesa_Modes[i].bpp = modeinfo->bpp;
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112 LogF(" Vesa_Install: 0x%x - %ix%ix%i\n",
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113 gVesa_Modes[i].code, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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119 giVesaDriverId = DevFS_AddDevice( &gVesa_DriverStruct );
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120 if(giVesaDriverId == -1) return MODULE_ERR_MISC;
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122 return MODULE_ERR_OK;
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125 /* Read from the framebuffer
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127 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 off, Uint64 len, void *buffer)
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130 LogF("Vesa_Read: () - NULL\n");
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136 * \brief Write to the framebuffer
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138 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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140 ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Bufffer);
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142 if(Buffer == NULL) {
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147 if( gVesa_Modes[giVesaCurrentMode].framebuffer == 0 ) {
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148 Log_Warning("VESA", "Vesa_Write - Non-LFB Modes not yet supported.");
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152 if(gVesa_Modes[giVesaCurrentMode].fbSize < Offset+Length)
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154 Log_Warning("VESA", "Vesa_Write - Framebuffer Overflow");
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159 memcpy(gVesaFramebuffer + Offset, Buffer, Length);
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161 LEAVE('X', Length);
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166 * \fn int Vesa_Ioctl(vfs_node *node, int id, void *data)
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167 * \brief Handle messages to the device
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169 int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data)
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173 case DRV_IOCTL_TYPE: return DRV_TYPE_VIDEO;
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174 case DRV_IOCTL_IDENT: memcpy("VESA", Data, 4); return 1;
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175 case DRV_IOCTL_VERSION: return VERSION;
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177 case VIDEO_IOCTL_GETSETMODE:
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178 if( !Data ) return giVesaCurrentMode;
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179 return Vesa_Int_SetMode( *(int*)Data );
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181 case VIDEO_IOCTL_FINDMODE:
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182 return Vesa_Int_FindMode((tVideo_IOCtl_Mode*)Data);
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183 case VIDEO_IOCTL_MODEINFO:
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184 return Vesa_Int_ModeInfo((tVideo_IOCtl_Mode*)Data);
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186 case VIDEO_IOCTL_REQLFB: // Request Linear Framebuffer
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192 int Vesa_Int_SetMode(int mode)
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195 LogF("Vesa_Int_SetMode: (mode=%i)\n", mode);
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198 // Sanity Check values
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199 if(mode < 0 || mode > giVesaModeCount) return -1;
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201 // Check for fast return
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202 if(mode == giVesaCurrentMode) return 1;
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204 LOCK( &glVesa_Lock );
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206 gpVesa_BiosState->AX = 0x4F02;
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207 gpVesa_BiosState->BX = gVesa_Modes[mode].code;
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208 if(gVesa_Modes[mode].flags & FLAG_LFB) {
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209 LogF(" Vesa_Int_SetMode: Using LFB\n");
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210 gpVesa_BiosState->BX |= 0x4000; // Bit 14 - Use LFB
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214 VM8086_Int(gpVesa_BiosState, 0x10);
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217 MM_UnmapHWPages((tVAddr)gVesaFramebuffer, giVesaPageCount);
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218 giVesaPageCount = (gVesa_Modes[mode].fbSize + 0xFFF) >> 12;
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219 gVesaFramebuffer = (void*)MM_MapHWPages(gVesa_Modes[mode].framebuffer, giVesaPageCount);
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221 LogF(" Vesa_Int_SetMode: Fb (Phys) = 0x%x\n", gVesa_Modes[mode].framebuffer);
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222 LogF(" Vesa_Int_SetMode: Fb (Virt) = 0x%x\n", gVesaFramebuffer);
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225 giVesaCurrentMode = mode;
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227 RELEASE( &glVesa_Lock );
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232 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data)
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235 int best = -1, bestFactor = 1000;
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238 LogF("Vesa_Int_FindMode: (data={width:%i,height:%i,bpp:%i})\n", data->width, data->height, data->bpp);
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240 for(i=0;i<giVesaModeCount;i++)
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243 LogF("Mode %i (%ix%ix%i), ", i, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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246 if(gVesa_Modes[i].width == data->width
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247 && gVesa_Modes[i].height == data->height
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248 && gVesa_Modes[i].bpp == data->bpp)
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251 LogF("Perfect!\n");
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257 tmp = gVesa_Modes[i].width * gVesa_Modes[i].height * gVesa_Modes[i].bpp;
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258 tmp -= data->width * data->height * data->bpp;
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259 tmp = tmp < 0 ? -tmp : tmp;
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260 factor = tmp * 100 / (data->width * data->height * data->bpp);
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263 LogF("factor = %i\n", factor);
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266 if(factor < bestFactor)
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268 bestFactor = factor;
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273 data->width = gVesa_Modes[best].width;
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274 data->height = gVesa_Modes[best].height;
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275 data->bpp = gVesa_Modes[best].bpp;
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279 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data)
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281 if(data->id < 0 || data->id > giVesaModeCount) return -1;
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282 data->width = gVesa_Modes[data->id].width;
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283 data->height = gVesa_Modes[data->id].height;
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284 data->bpp = gVesa_Modes[data->id].bpp;
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