3 * Video BIOS Extensions (Vesa) Driver
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6 #define VERSION 0x100
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10 #include <api_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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18 #define VESA_DEFAULT_FRAMEBUFFER (KERNEL_BASE|0xA0000)
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19 #define BLINKING_CURSOR 1
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21 # define VESA_CURSOR_PERIOD 1000
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24 // === PROTOTYPES ===
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25 int Vesa_Install(char **Arguments);
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26 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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27 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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28 int Vesa_IOCtl(tVFS_Node *Node, int ID, void *Data);
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29 int Vesa_Int_SetMode(int Mode);
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30 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data);
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31 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data);
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32 void Vesa_FlipCursor(void *Arg);
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35 MODULE_DEFINE(0, VERSION, Vesa, Vesa_Install, NULL, "PCI", "VM8086", NULL);
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36 tDevFS_Driver gVesa_DriverStruct = {
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40 .Write = Vesa_Write,
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45 tVM8086 *gpVesa_BiosState;
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46 int giVesaDriverId = -1;
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47 // --- Video Modes ---
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48 int giVesaCurrentMode = 0;
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49 tVesa_Mode *gVesa_Modes;
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50 tVesa_Mode *gpVesaCurMode;
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51 int giVesaModeCount = 0;
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52 // --- Framebuffer ---
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53 char *gpVesa_Framebuffer = (void*)VESA_DEFAULT_FRAMEBUFFER;
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54 int giVesaPageCount = 0; //!< Framebuffer size in pages
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55 // --- Cursor Control ---
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56 int giVesaCursorX = -1;
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57 int giVesaCursorY = -1;
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58 int giVesaCursorTimer = -1; // Invalid timer
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59 int gbVesa_CursorVisible = 0;
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60 // --- 2D Video Stream Handlers ---
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61 tDrvUtil_Video_BufInfo gVesa_BufInfo;
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64 int Vesa_Install(char **Arguments)
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66 tVesa_CallInfo *info;
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68 tVesa_CallModeInfo *modeinfo;
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69 tFarPtr modeinfoPtr;
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73 // Allocate Info Block
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74 gpVesa_BiosState = VM8086_Init();
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75 info = VM8086_Allocate(gpVesa_BiosState, 512, &infoPtr.seg, &infoPtr.ofs);
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76 modeinfo = VM8086_Allocate(gpVesa_BiosState, 512, &modeinfoPtr.seg, &modeinfoPtr.ofs);
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77 // Set Requested Version
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78 memcpy(info->signature, "VBE2", 4);
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80 gpVesa_BiosState->AX = 0x4F00;
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81 gpVesa_BiosState->ES = infoPtr.seg; gpVesa_BiosState->DI = infoPtr.ofs;
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83 VM8086_Int(gpVesa_BiosState, 0x10);
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84 if(gpVesa_BiosState->AX != 0x004F) {
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85 Log_Warning("VESA", "Vesa_Install - VESA/VBE Unsupported (AX = 0x%x)", gpVesa_BiosState->AX);
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86 return MODULE_ERR_NOTNEEDED;
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89 //Log_Debug("VESA", "info->VideoModes = %04x:%04x", info->VideoModes.seg, info->VideoModes.ofs);
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90 modes = (Uint16 *) VM8086_GetPointer(gpVesa_BiosState, info->VideoModes.seg, info->VideoModes.ofs);
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93 for( giVesaModeCount = 0; modes[giVesaModeCount] != 0xFFFF; giVesaModeCount++ );
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94 gVesa_Modes = (tVesa_Mode *)malloc( giVesaModeCount * sizeof(tVesa_Mode) );
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96 Log_Debug("VESA", "%i Modes", giVesaModeCount);
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99 gVesa_Modes[0].width = 80;
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100 gVesa_Modes[0].height = 25;
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101 gVesa_Modes[0].bpp = 12;
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102 gVesa_Modes[0].code = 0x3;
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103 gVesa_Modes[0].flags = 1;
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104 gVesa_Modes[0].fbSize = 80*25*2;
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105 gVesa_Modes[0].framebuffer = 0xB8000;
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107 for( i = 1; i < giVesaModeCount; i++ )
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109 gVesa_Modes[i].code = modes[i];
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111 gpVesa_BiosState->AX = 0x4F01;
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112 gpVesa_BiosState->CX = gVesa_Modes[i].code;
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113 gpVesa_BiosState->ES = modeinfoPtr.seg;
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114 gpVesa_BiosState->DI = modeinfoPtr.ofs;
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115 VM8086_Int(gpVesa_BiosState, 0x10);
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118 gVesa_Modes[i].flags = 0;
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119 if ( (modeinfo->attributes & 0x90) == 0x90 )
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121 gVesa_Modes[i].flags |= FLAG_LFB;
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122 gVesa_Modes[i].framebuffer = modeinfo->physbase;
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123 gVesa_Modes[i].fbSize = modeinfo->Yres*modeinfo->pitch;
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125 gVesa_Modes[i].framebuffer = 0;
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126 gVesa_Modes[i].fbSize = 0;
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129 gVesa_Modes[i].pitch = modeinfo->pitch;
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130 gVesa_Modes[i].width = modeinfo->Xres;
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131 gVesa_Modes[i].height = modeinfo->Yres;
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132 gVesa_Modes[i].bpp = modeinfo->bpp;
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135 Log_Log("VESA", "0x%x - %ix%ix%i",
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136 gVesa_Modes[i].code, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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142 giVesaDriverId = DevFS_AddDevice( &gVesa_DriverStruct );
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143 if(giVesaDriverId == -1) return MODULE_ERR_MISC;
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145 return MODULE_ERR_OK;
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148 /* Read from the framebuffer
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150 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 off, Uint64 len, void *buffer)
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153 Log("Vesa_Read: () - NULL\n");
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159 * \brief Write to the framebuffer
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161 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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163 if( gVesa_Modes[giVesaCurrentMode].framebuffer == 0 ) {
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164 Log_Warning("VESA", "Vesa_Write - Non-LFB Modes not yet supported.");
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168 return DrvUtil_Video_WriteLFB(&gVesa_BufInfo, Offset, Length, Buffer);
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171 const char *csaVESA_IOCtls[] = {DRV_IOCTLNAMES, DRV_VIDEO_IOCTLNAMES, NULL};
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173 * \brief Handle messages to the device
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175 int Vesa_IOCtl(tVFS_Node *Node, int ID, void *Data)
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178 //Log_Debug("VESA", "Vesa_Ioctl: (Node=%p, ID=%i, Data=%p)", Node, ID, Data);
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181 BASE_IOCTLS(DRV_TYPE_VIDEO, "VESA", VERSION, csaVESA_IOCtls);
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183 case VIDEO_IOCTL_GETSETMODE:
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184 if( !Data ) return giVesaCurrentMode;
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185 return Vesa_Int_SetMode( *(int*)Data );
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187 case VIDEO_IOCTL_FINDMODE:
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188 return Vesa_Int_FindMode((tVideo_IOCtl_Mode*)Data);
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189 case VIDEO_IOCTL_MODEINFO:
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190 return Vesa_Int_ModeInfo((tVideo_IOCtl_Mode*)Data);
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192 case VIDEO_IOCTL_SETBUFFORMAT:
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193 DrvUtil_Video_DrawCursor( &gVesa_BufInfo, -1, -1 );
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194 giVesaCursorX = -1;
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195 #if BLINKING_CURSOR
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196 if(giVesaCursorTimer != -1) {
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197 Time_RemoveTimer(giVesaCursorTimer);
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198 giVesaCursorTimer = -1;
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201 ret = gVesa_BufInfo.BufferFormat;
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202 if(Data) gVesa_BufInfo.BufferFormat = *(int*)Data;
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203 if(gVesa_BufInfo.BufferFormat == VIDEO_BUFFMT_TEXT)
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204 DrvUtil_Video_SetCursor( &gVesa_BufInfo, &gDrvUtil_TextModeCursor );
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207 case VIDEO_IOCTL_SETCURSOR: // Set cursor position
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208 DrvUtil_Video_RemoveCursor( &gVesa_BufInfo );
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209 #if BLINKING_CURSOR
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210 if(giVesaCursorTimer != -1) {
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211 Time_RemoveTimer(giVesaCursorTimer);
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212 giVesaCursorTimer = -1;
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215 giVesaCursorX = ((tVideo_IOCtl_Pos*)Data)->x;
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216 giVesaCursorY = ((tVideo_IOCtl_Pos*)Data)->y;
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217 gbVesa_CursorVisible = (giVesaCursorX >= 0);
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218 if(gVesa_BufInfo.BufferFormat == VIDEO_BUFFMT_TEXT)
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220 DrvUtil_Video_DrawCursor(
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222 giVesaCursorX*giVT_CharWidth,
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223 giVesaCursorY*giVT_CharHeight
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225 #if BLINKING_CURSOR
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226 giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, NULL);
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230 DrvUtil_Video_DrawCursor(
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241 * \brief Updates the video mode
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243 int Vesa_Int_SetMode(int mode)
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245 // Sanity Check values
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246 if(mode < 0 || mode > giVesaModeCount) return -1;
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248 Log_Log("VESA", "Setting mode to %i (%ix%i %ibpp)",
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250 gVesa_Modes[mode].width, gVesa_Modes[mode].height,
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251 gVesa_Modes[mode].bpp
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254 // Check for fast return
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255 if(mode == giVesaCurrentMode) return 1;
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257 Time_RemoveTimer(giVesaCursorTimer);
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258 giVesaCursorTimer = -1;
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260 Mutex_Acquire( &glVesa_Lock );
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262 gpVesa_BiosState->AX = 0x4F02;
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263 gpVesa_BiosState->BX = gVesa_Modes[mode].code;
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264 if(gVesa_Modes[mode].flags & FLAG_LFB) {
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265 Log_Log("VESA", "Using LFB");
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266 gpVesa_BiosState->BX |= 0x4000; // Bit 14 - Use LFB
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270 VM8086_Int(gpVesa_BiosState, 0x10);
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273 if( (tVAddr)gpVesa_Framebuffer != VESA_DEFAULT_FRAMEBUFFER )
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274 MM_UnmapHWPages((tVAddr)gpVesa_Framebuffer, giVesaPageCount);
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275 giVesaPageCount = (gVesa_Modes[mode].fbSize + 0xFFF) >> 12;
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276 gpVesa_Framebuffer = (void*)MM_MapHWPages(gVesa_Modes[mode].framebuffer, giVesaPageCount);
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278 Log_Log("VESA", "Framebuffer (Phys) = 0x%x, (Virt) = 0x%x, Size = 0x%x",
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279 gVesa_Modes[mode].framebuffer, gpVesa_Framebuffer, giVesaPageCount << 12);
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282 giVesaCurrentMode = mode;
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283 gpVesaCurMode = &gVesa_Modes[giVesaCurrentMode];
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285 Mutex_Release( &glVesa_Lock );
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287 gVesa_BufInfo.Framebuffer = gpVesa_Framebuffer;
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288 gVesa_BufInfo.Pitch = gVesa_Modes[mode].pitch;
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289 gVesa_BufInfo.Width = gVesa_Modes[mode].width;
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290 gVesa_BufInfo.Height = gVesa_Modes[mode].height;
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291 gVesa_BufInfo.Depth = gVesa_Modes[mode].bpp;
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296 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data)
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299 int best = -1, bestFactor = 1000;
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302 ENTER("idata->width idata->height idata->bpp", data->width, data->height, data->bpp);
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304 for(i=0;i<giVesaModeCount;i++)
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306 LOG("Mode %i (%ix%ix%i)", i, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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308 if(gVesa_Modes[i].width == data->width && gVesa_Modes[i].height == data->height)
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310 //if( (data->bpp == 32 || data->bpp == 24)
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311 // && (gVesa_Modes[i].bpp == 32 || gVesa_Modes[i].bpp == 24) )
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312 if( data->bpp == gVesa_Modes[i].bpp )
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320 tmp = gVesa_Modes[i].width * gVesa_Modes[i].height;
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321 tmp -= data->width * data->height;
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322 tmp = tmp < 0 ? -tmp : tmp;
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323 factor = tmp * 1000 / (data->width * data->height);
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325 if( data->bpp == 8 && gVesa_Modes[i].bpp != 8 ) continue;
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326 if( data->bpp == 16 && gVesa_Modes[i].bpp != 16 ) continue;
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328 if( (data->bpp == 32 || data->bpp == 24)
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329 && (gVesa_Modes[i].bpp == 32 || gVesa_Modes[i].bpp == 24) )
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331 if( data->bpp == gVesa_Modes[i].bpp )
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335 if( data->bpp != gVesa_Modes[i].bpp )
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339 LOG("factor = %i", factor);
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341 if(factor < bestFactor)
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343 bestFactor = factor;
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348 data->width = gVesa_Modes[best].width;
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349 data->height = gVesa_Modes[best].height;
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350 data->bpp = gVesa_Modes[best].bpp;
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355 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data)
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357 if(data->id < 0 || data->id > giVesaModeCount) return -1;
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358 data->width = gVesa_Modes[data->id].width;
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359 data->height = gVesa_Modes[data->id].height;
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360 data->bpp = gVesa_Modes[data->id].bpp;
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365 * \brief Updates the state of the text cursor
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366 * \note Just does a bitwise not on the cursor region
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368 void Vesa_FlipCursor(void *Arg)
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370 if( gVesa_BufInfo.BufferFormat != VIDEO_BUFFMT_TEXT )
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373 if( gbVesa_CursorVisible )
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374 DrvUtil_Video_RemoveCursor(&gVesa_BufInfo);
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376 DrvUtil_Video_DrawCursor(&gVesa_BufInfo,
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377 giVesaCursorX*giVT_CharWidth,
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378 giVesaCursorY*giVT_CharHeight
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380 gbVesa_CursorVisible = !gbVesa_CursorVisible;
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382 #if BLINKING_CURSOR
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383 giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, Arg);
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