i915_gop.c

#include "i915_gop.h"

STATIC EFI_GRAPHICS_OUTPUT_MODE_INFORMATION
    g_mode_info[] = {
        {
            0,    // Version
            1024, // HorizontalResolution
            768,  // VerticalResolution
        }};

STATIC EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE
    g_mode = {
        ARRAY_SIZE(g_mode_info),                      // MaxMode
        0,                                            // Mode
        g_mode_info,                                  // Info
        sizeof(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION), // SizeOfInfo
};
STATIC EFI_STATUS

    EFIAPI
    i915GraphicsOutputQueryMode(
        IN EFI_GRAPHICS_OUTPUT_PROTOCOL

            *This,
        IN UINT32
            ModeNumber,
        OUT UINTN
            *SizeOfInfo,
        OUT EFI_GRAPHICS_OUTPUT_MODE_INFORMATION
            **Info)
{
    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *ModeInfo;
    PRINT_DEBUG(EFI_D_ERROR,
                "i915: query mode\n");

    if (Info == NULL || SizeOfInfo == NULL ||
        ModeNumber >= g_mode.MaxMode)
    {
        return EFI_INVALID_PARAMETER;
    }
    ModeInfo = &g_mode_info[ModeNumber];

    *Info = AllocateCopyPool(sizeof(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION), ModeInfo);
    if (*Info == NULL)
    {
        return EFI_OUT_OF_RESOURCES;
    }
    *SizeOfInfo = sizeof(EFI_GRAPHICS_OUTPUT_MODE_INFORMATION);

    return EFI_SUCCESS;
}

STATIC FRAME_BUFFER_CONFIGURE
    *
        g_i915FrameBufferBltConfigure = NULL;
STATIC UINTN
    g_i915FrameBufferBltConfigureSize = 0;

EFI_STATUS i915GraphicsFramebufferConfigure(i915_CONTROLLER *controller)
{
    g_mode.FrameBufferBase = controller->FbBase;
    g_mode.FrameBufferSize = controller->fbsize;

    // //test pattern
    // //there is just one page wrapping around... why?
    // //we have intel_vgpu_mmap in effect so the correct range is mmaped host vmem
    // //and the host vmem is actually one-page!
    // ((UINT32*)controller->FbBase)[-1]=0x00010203;
    // //there is a mechanism called `get_pages` that seems to put main memory behind the aperture or sth
    // //the page is the scratch page that unmapped GTT entries point to
    // //we need to set up a GTT for our framebuffer: https://bwidawsk.net/blog/index.php/2014/06/the-global-gtt-part-1/
    // UINT32 cnt=0;
    // for(cnt=0;cnt<256*16;cnt++){
    // 	((UINT32*)controller->FbBase)[cnt]=0x00010203;
    // }
    // for(cnt=0;cnt<256*4;cnt++){
    // 	UINT32 c=cnt&255;
    // 	((UINT32*)controller->FbBase)[cnt]=((cnt+256)&256?c:0)+((cnt+256)&512?c<<8:0)+((cnt+256)&1024?c<<16:0);
    // }
    // DebugPrint(EFI_D_ERROR,"i915: wrap test %08x %08x %08x %08x\n",((UINT32*)controller->FbBase)[1024],((UINT32*)controller->FbBase)[1025],((UINT32*)controller->FbBase)[1026],((UINT32*)controller->FbBase)[1027]);
    // //
    // cnt=0;
    // for(UINT32 y=0;y<vertical_active;y+=1){
    // 	for(UINT32 x=0;x<horizontal_active;x+=1){
    // 		UINT32 data=(((x<<8)/horizontal_active)<<16)|(((y<<8)/vertical_active)<<8);
    // 		((UINT32*)controller->FbBase)[cnt]=(data&0xffff00)|0x80;
    // 		cnt++;
    // 	}
    // }
    // write32(_DSPACNTR,DISPLAY_PLANE_ENABLE|DISPPLANE_BGRX888);

    //blt stuff
    EFI_STATUS Status;
    Status = FrameBufferBltConfigure(
        (VOID *)controller->FbBase,
        g_mode_info,
        g_i915FrameBufferBltConfigure,
        &g_i915FrameBufferBltConfigureSize);

    if (Status == RETURN_BUFFER_TOO_SMALL)
    {
        if (g_i915FrameBufferBltConfigure != NULL)
        {
            FreePool(g_i915FrameBufferBltConfigure);
        }
        g_i915FrameBufferBltConfigure = AllocatePool(g_i915FrameBufferBltConfigureSize);
        if (g_i915FrameBufferBltConfigure == NULL)
        {
            g_i915FrameBufferBltConfigureSize = 0;
            return EFI_OUT_OF_RESOURCES;
        }

        Status = FrameBufferBltConfigure(
            (VOID *)controller->FbBase,
            g_mode_info,
            g_i915FrameBufferBltConfigure,
            &g_i915FrameBufferBltConfigureSize);
    }
    if (EFI_ERROR(Status))
    {
        PRINT_DEBUG(EFI_D_ERROR, "failed to setup blt\n");
    }
    return EFI_SUCCESS;
}

STATIC EFI_STATUS

    EFIAPI
    i915GraphicsOutputBlt(
        IN EFI_GRAPHICS_OUTPUT_PROTOCOL

            *This,
        IN EFI_GRAPHICS_OUTPUT_BLT_PIXEL
            *BltBuffer,
        OPTIONAL
            IN
                EFI_GRAPHICS_OUTPUT_BLT_OPERATION BltOperation,
        IN
            UINTN SourceX,
        IN
            UINTN SourceY,
        IN
            UINTN DestinationX,
        IN
            UINTN DestinationY,
        IN
            UINTN Width,
        IN
            UINTN Height,
        IN
            UINTN Delta)
{
    EFI_STATUS Status = FrameBufferBlt(
        g_i915FrameBufferBltConfigure,
        BltBuffer,
        BltOperation,
        SourceX,
        SourceY,
        DestinationX,
        DestinationY,
        Width,
        Height,
        Delta);
    //PRINT_DEBUG(EFI_D_ERROR,
    //"i915: blt %d %d,%d %dx%d\n",Status,DestinationX,DestinationY,Width,Height);
    return Status;
}
STATIC EFI_STATUS

    EFIAPI
    i915GraphicsOutputSetMode(
        IN EFI_GRAPHICS_OUTPUT_PROTOCOL

            *This,
        IN UINT32
            ModeNumber)

{
    return setDisplayGraphicsMode(ModeNumber);
}

EFI_STATUS i915GraphicsSetupOutput(EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput, UINT32 x_active, UINT32 y_active)
{

    g_mode_info[0].HorizontalResolution = x_active;
    g_mode_info[0].VerticalResolution = y_active;
    g_mode_info[0].PixelsPerScanLine = ((x_active * 4 + 63) & -64) >> 2;
    g_mode_info[0].PixelFormat = PixelBlueGreenRedReserved8BitPerColor;

    GraphicsOutput->QueryMode = i915GraphicsOutputQueryMode;
    GraphicsOutput->SetMode = i915GraphicsOutputSetMode;
    GraphicsOutput->Blt = i915GraphicsOutputBlt;
    GraphicsOutput->Mode = &g_mode;
    EFI_STATUS stat = GraphicsOutput->SetMode(GraphicsOutput, 0);
    PRINT_DEBUG(EFI_D_ERROR, "progressed to gopline %d, status is %u\n",
                __LINE__, stat);
    return stat;
}