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[FREELDR:PC] Add a mechanism to retrieve the initial video mode on startup (#8506)
This allows FreeLoader to know which initial video mode it has been started with (e.g. if chainloaded from another bootloader that has set the display to something different from 80x25 text mode), and, either update its internal state and use the video mode if supported, or, fall back to a known supported video mode (80x25 text).
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Hermès Bélusca-Maïto
@@ -106,12 +106,13 @@ typedef struct
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ULONG MaximumPixelClock; /* Maximum pixel clock for graphics video mode, in Hz */
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UCHAR Reserved2[190]; /* 190 BYTEs reserved (0) */
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} SVGA_MODE_INFORMATION, *PSVGA_MODE_INFORMATION;
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C_ASSERT(sizeof(SVGA_MODE_INFORMATION) == 256);
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#include <poppack.h>
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UCHAR MachDefaultTextColor = COLOR_GRAY;
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static ULONG VideoCard = VIDEOCARD_CGA_OR_OTHER; /* Type of video card installed on the system */
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static USHORT BiosVideoMode; /* Current video mode as known by BIOS */
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static USHORT BiosVideoMode = VIDEOMODE_NORMAL_TEXT; /* Current video mode as known by BIOS */
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static ULONG ScreenWidth = 80; /* Screen Width in characters */
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static ULONG ScreenHeight = 25; /* Screen Height in characters */
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static ULONG BytesPerScanLine = 160; /* Number of bytes per scanline (delta) */
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@@ -202,11 +203,13 @@ PcVideoDetectVideoCard(VOID)
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}
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static BOOLEAN
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PcVideoVesaGetSVGAModeInformation(USHORT Mode, PSVGA_MODE_INFORMATION ModeInformation)
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PcVideoVesaGetSVGAModeInformation(
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_In_ USHORT Mode,
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_Out_ PSVGA_MODE_INFORMATION ModeInformation)
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{
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REGS Regs;
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RtlZeroMemory((PVOID)BIOSCALLBUFFER, 256);
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RtlZeroMemory((PVOID)BIOSCALLBUFFER, sizeof(*ModeInformation));
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/* VESA SuperVGA BIOS - GET SuperVGA MODE INFORMATION
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* AX = 4F01h
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@@ -234,43 +237,230 @@ PcVideoVesaGetSVGAModeInformation(USHORT Mode, PSVGA_MODE_INFORMATION ModeInform
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if (Regs.w.ax != 0x004F)
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return FALSE;
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RtlCopyMemory(ModeInformation, (PVOID)BIOSCALLBUFFER, sizeof(SVGA_MODE_INFORMATION));
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RtlCopyMemory(ModeInformation, (PVOID)BIOSCALLBUFFER, sizeof(*ModeInformation));
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TRACE("\n");
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TRACE("BiosVesaGetSVGAModeInformation() mode 0x%x\n", Mode);
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TRACE("ModeAttributes = 0x%x\n", ModeInformation->ModeAttributes);
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TRACE("WindowAttributesA = 0x%x\n", ModeInformation->WindowAttributesA);
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TRACE("WindowAttributesB = 0x%x\n", ModeInformation->WindowsAttributesB);
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TRACE("WindowGranularity = %dKB\n", ModeInformation->WindowGranularity);
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TRACE("WindowSize = %dKB\n", ModeInformation->WindowSize);
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TRACE("WindowAStartSegment = 0x%x\n", ModeInformation->WindowAStartSegment);
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TRACE("WindowBStartSegment = 0x%x\n", ModeInformation->WindowBStartSegment);
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TRACE("BiosVesaGetSVGAModeInformation(Mode 0x%x)\n", Mode);
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TRACE("ModeAttributes = 0x%04x\n", ModeInformation->ModeAttributes);
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TRACE("WindowAttributesA = 0x%02x\n", ModeInformation->WindowAttributesA);
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TRACE("WindowAttributesB = 0x%02x\n", ModeInformation->WindowsAttributesB);
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TRACE("WindowGranularity = %huKB\n", ModeInformation->WindowGranularity);
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TRACE("WindowSize = %huKB\n", ModeInformation->WindowSize);
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TRACE("WindowAStartSegment = 0x%04x\n", ModeInformation->WindowAStartSegment);
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TRACE("WindowBStartSegment = 0x%04x\n", ModeInformation->WindowBStartSegment);
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TRACE("WindowPositioningFunction = 0x%x\n", ModeInformation->WindowPositioningFunction);
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TRACE("BytesPerScanLine = %d\n", ModeInformation->BytesPerScanLine);
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TRACE("WidthInPixels = %d\n", ModeInformation->WidthInPixels);
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TRACE("HeightInPixels = %d\n", ModeInformation->HeightInPixels);
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TRACE("CharacterWidthInPixels = %d\n", ModeInformation->CharacterWidthInPixels);
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TRACE("CharacterHeightInPixels = %d\n", ModeInformation->CharacterHeightInPixels);
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TRACE("NumberOfMemoryPlanes = %d\n", ModeInformation->NumberOfMemoryPlanes);
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TRACE("BitsPerPixel = %d\n", ModeInformation->BitsPerPixel);
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TRACE("NumberOfBanks = %d\n", ModeInformation->NumberOfBanks);
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TRACE("MemoryModel = %d\n", ModeInformation->MemoryModel);
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TRACE("BankSize = %d\n", ModeInformation->BankSize);
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TRACE("NumberOfImagePlanes = %d\n", ModeInformation->NumberOfImagePanes);
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TRACE("BytesPerScanLine = %hu\n", ModeInformation->BytesPerScanLine);
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TRACE("WidthInPixels = %hu\n", ModeInformation->WidthInPixels);
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TRACE("HeightInPixels = %hu\n", ModeInformation->HeightInPixels);
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TRACE("CharacterWidthInPixels = %u\n", ModeInformation->CharacterWidthInPixels);
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TRACE("CharacterHeightInPixels = %u\n", ModeInformation->CharacterHeightInPixels);
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TRACE("NumberOfMemoryPlanes = %u\n", ModeInformation->NumberOfMemoryPlanes);
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TRACE("BitsPerPixel = %u\n", ModeInformation->BitsPerPixel);
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TRACE("NumberOfBanks = %u\n", ModeInformation->NumberOfBanks);
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TRACE("MemoryModel = %u\n", ModeInformation->MemoryModel);
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TRACE("BankSize = %u\n", ModeInformation->BankSize);
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TRACE("NumberOfImagePanes = %u\n", ModeInformation->NumberOfImagePanes);
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TRACE("Reserved1 = 0x%02x\n", ModeInformation->Reserved1);
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TRACE("---VBE v1.2+ ---\n");
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TRACE("RedMaskSize = %d\n", ModeInformation->RedMaskSize);
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TRACE("RedMaskPosition = %d\n", ModeInformation->RedMaskPosition);
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TRACE("GreenMaskSize = %d\n", ModeInformation->GreenMaskSize);
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TRACE("GreenMaskPosition = %d\n", ModeInformation->GreenMaskPosition);
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TRACE("BlueMaskSize = %d\n", ModeInformation->BlueMaskSize);
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TRACE("BlueMaskPosition = %d\n", ModeInformation->BlueMaskPosition);
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TRACE("ReservedMaskSize = %d\n", ModeInformation->ReservedMaskSize);
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TRACE("ReservedMaskPosition = %d\n", ModeInformation->ReservedMaskPosition);
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TRACE("RedMaskSize = %u\n", ModeInformation->RedMaskSize);
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TRACE("RedMaskPosition = %u\n", ModeInformation->RedMaskPosition);
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TRACE("GreenMaskSize = %u\n", ModeInformation->GreenMaskSize);
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TRACE("GreenMaskPosition = %u\n", ModeInformation->GreenMaskPosition);
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TRACE("BlueMaskSize = %u\n", ModeInformation->BlueMaskSize);
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TRACE("BlueMaskPosition = %u\n", ModeInformation->BlueMaskPosition);
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TRACE("ReservedMaskSize = %u\n", ModeInformation->ReservedMaskSize);
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TRACE("ReservedMaskPosition = %u\n", ModeInformation->ReservedMaskPosition);
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TRACE("DirectColorModeInfo = 0x%02x\n", ModeInformation->DirectColorModeInfo);
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TRACE("---VBE v2.0+ ---\n");
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TRACE("LinearVideoBufferAddress = 0x%x\n", ModeInformation->LinearVideoBufferAddress);
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TRACE("OffscreenMemoryPointer = 0x%x\n", ModeInformation->OffscreenMemoryPointer);
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TRACE("OffscreenMemorySize = %huKB\n", ModeInformation->OffscreenMemorySize);
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TRACE("---VBE v3.0 ---\n");
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TRACE("LinearBytesPerScanLine = %hu\n", ModeInformation->LinearBytesPerScanLine);
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TRACE("BankedNumberOfImages = %u\n", ModeInformation->BankedNumberOfImages);
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TRACE("LinearNumberOfImages = %u\n", ModeInformation->LinearNumberOfImages);
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TRACE("LinearRedMaskSize = %u\n", ModeInformation->LinearRedMaskSize);
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TRACE("LinearRedMaskPosition = %u\n", ModeInformation->LinearRedMaskPosition);
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TRACE("LinearGreenMaskSize = %u\n", ModeInformation->LinearGreenMaskSize);
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TRACE("LinearGreenMaskPosition = %u\n", ModeInformation->LinearGreenMaskPosition);
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TRACE("LinearBlueMaskSize = %u\n", ModeInformation->LinearBlueMaskSize);
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TRACE("LinearBlueMaskPosition = %u\n", ModeInformation->LinearBlueMaskPosition);
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TRACE("LinearReservedMaskSize = %u\n", ModeInformation->LinearReservedMaskSize);
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TRACE("LinearReservedMaskPosition = %u\n", ModeInformation->LinearReservedMaskPosition);
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TRACE("MaximumPixelClock = %luHz\n", ModeInformation->MaximumPixelClock);
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TRACE("\n");
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return TRUE;
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}
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static BOOLEAN
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PcVideoVesaGetCurrentSVGAMode(
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_Out_ PUSHORT Mode)
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{
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REGS Regs;
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/*
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* VESA SuperVGA BIOS - GET CURRENT VIDEO MODE
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*
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* AX = 4F03h
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* Return:
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* AL = 4Fh if function supported
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* AH = status
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* 00h successful
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* BX = video mode (see #00083,#00084)
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*
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* bit 13:
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* VBE/AF v1.0P accelerated video mode
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*
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* bit 14:
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* Linear frame buffer enabled (VBE v2.0+)
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*
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* bit 15:
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* Don't clear video memory
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* 01h failed
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*/
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Regs.w.ax = 0x4F03;
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Int386(0x10, &Regs, &Regs);
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if (Regs.w.ax != 0x004F)
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return FALSE;
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*Mode = Regs.w.bx;
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return TRUE;
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}
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static BOOLEAN
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PcVideoGetBiosMode(
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_Out_ PUSHORT Mode)
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{
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REGS Regs;
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/* Int 10h AH=0Fh
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* VIDEO - GET CURRENT VIDEO MODE
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*
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* AH = 0Fh
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* Return:
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* AH = number of character columns
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* AL = display mode (see #00010 at AH=00h)
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* BH = active page (see AH=05h)
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*
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* Notes: If mode was set with bit 7 set ("no blanking"), the returned
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* mode will also have bit 7 set. EGA, VGA, and UltraVision return either
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* AL=03h (color) or AL=07h (monochrome) in all extended-row text modes.
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* HP 200LX returns AL=07h (monochrome) if mode was set to AL=21h and
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* always 80 resp. 40 columns in all text modes regardless of current
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* zoom setting (see AH=D0h). When using a Hercules Graphics Card,
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* additional checks are necessary:
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*
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* mode 05h:
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* If WORD 0040h:0063h is 03B4h, may be in graphics page 1
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* (as set by DOSSHELL and other Microsoft software)
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*
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* mode 06h:
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* If WORD 0040h:0063h is 03B4h, may be in graphics page 0
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* (as set by DOSSHELL and other Microsoft software)
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*
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* mode 07h:
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* If BYTE 0040h:0065h bit 1 is set, Hercules card is in
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* graphics mode, with bit 7 indicating the page (mode set by
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* Hercules driver for Borland Turbo C).
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* The Tandy 2000 BIOS is only documented as returning AL, not AH or BH
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*/
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Regs.b.ah = 0x0F;
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Int386(0x10, &Regs, &Regs);
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if (Regs.b.ah == 0)
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return FALSE;
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*Mode = Regs.b.al;
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return TRUE;
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}
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static VOID
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PcVideoGetDisplayMode(VOID)
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{
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USHORT Mode = 0;
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/* Is the current mode VESA? */
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if (PcVideoVesaGetCurrentSVGAMode(&Mode) &&
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PcVideoVesaGetSVGAModeInformation(Mode, &VesaVideoModeInformation))
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{
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TRACE("VESA mode detected\n");
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ScreenWidth = VesaVideoModeInformation.WidthInPixels;
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ScreenHeight = VesaVideoModeInformation.HeightInPixels;
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BytesPerScanLine = VesaVideoModeInformation.BytesPerScanLine;
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BiosVideoMode = Mode;
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DisplayMode = (0x0108 <= Mode && Mode <= 0x010C) ? VideoTextMode : VideoGraphicsMode;
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VesaVideoMode = TRUE;
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}
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/* If not, it should be a regular BIOS mode */
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else if (PcVideoGetBiosMode(&Mode))
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{
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/*
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* The BIOS data area 0x400 holds information about the current video mode.
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* Infos at: https://web.archive.org/web/20240119203029/http://www.bioscentral.com/misc/bda.htm
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* https://stanislavs.org/helppc/bios_data_area.html
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*/
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UCHAR BiosMode = (*(PUCHAR)0x449) & 0x7F; /* Current video mode */
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ASSERT(BiosMode == Mode);
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BiosVideoMode = Mode;
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TRACE("BIOS mode detected\n");
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ScreenWidth = *(PUSHORT)0x44A; /* Number of screen columns */
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ScreenHeight = 1 + *(PUCHAR)0x484; /* 1 + "Rows on the screen (less 1, EGA+)" */
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/*
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* Select bits 7 and 4 of "Video display data area (MCGA and VGA)"
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* |7|6|5|4|3|2|1|0|
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* | `------ see table below
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* `--------- alphanumeric scan lines (see table below)
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*
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* then convert to a number and map it to the scanline number:
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* Bit7 Bit4 Scan Lines
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* 0 0 350 line mode
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* 0 1 400 line mode
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* 1 0 200 line mode
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* 1 1 reserved
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*/
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BytesPerScanLine = (*(PUCHAR)0x489) & 0x90;
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BytesPerScanLine = ((BytesPerScanLine & 0x80) >> 6) | ((BytesPerScanLine & 0x10) >> 4);
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switch (BytesPerScanLine)
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{
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case VERTRES_200_SCANLINES:
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BytesPerScanLine = 200; break;
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case VERTRES_350_SCANLINES:
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BytesPerScanLine = 350; break;
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case VERTRES_400_SCANLINES:
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BytesPerScanLine = 400; break;
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default:
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BytesPerScanLine = 160; break;
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}
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DisplayMode = VideoTextMode;
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VesaVideoMode = FALSE;
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}
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else
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{
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/* Set the values for the default text mode.
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* If a graphics mode is set, these values will be changed. */
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TRACE("Fallback mode detected\n");
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BiosVideoMode = VIDEOMODE_NORMAL_TEXT;
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ScreenWidth = 80;
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ScreenHeight = 25;
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BytesPerScanLine = 160;
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DisplayMode = VideoTextMode;
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VesaVideoMode = FALSE;
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}
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TRACE("This is a %s video mode\n", VesaVideoMode ? "VESA" : "BIOS");
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TRACE("BiosVideoMode = 0x%x\n", BiosVideoMode);
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TRACE("DisplayMode = %sMode\n", DisplayMode == VideoTextMode ? "Text" : "Graphics");
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TRACE("ScreenWidth = %lu\n", ScreenWidth);
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TRACE("ScreenHeight = %lu\n", ScreenHeight);
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TRACE("BytesPerScanLine = %lu\n", BytesPerScanLine);
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}
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static BOOLEAN
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PcVideoSetBiosVesaMode(USHORT Mode)
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{
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@@ -849,6 +1039,14 @@ PcVideoInit(VOID)
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{
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/* Detect the installed video card */
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VideoCard = PcVideoDetectVideoCard();
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/* Retrieve the initial display mode parameters */
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PcVideoGetDisplayMode();
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// FIXME: We don't support graphics modes yet!
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// Revert to 80x25 text mode.
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if (DisplayMode != VideoTextMode)
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PcVideoSetMode(VIDEOMODE_NORMAL_TEXT);
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}
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VIDEODISPLAYMODE
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