Initial support for EFI framebuffer

sdk/xtdk/hlfuncs.h

@@ -15,6 +15,10 @@
 
 
 /* HAL library routines forward references */
+XTAPI
+VOID
+HlClearScreen(VOID);
+
 XTCDECL
 XTSTATUS
 HlComPortGetByte(IN PCPPORT Port,
@@ -32,6 +36,12 @@ UCHAR
 HlComPortReadLsr(IN PCPPORT Port,
                  IN UCHAR Byte);
 
+XTAPI
+VOID
+HlDrawPixel(IN ULONG PosX,
+            IN ULONG PosY,
+            IN ULONG Color);
+
 XTCDECL
 XTSTATUS
 HlInitializeComPort(IN OUT PCPPORT Port,
@@ -39,4 +49,8 @@ HlInitializeComPort(IN OUT PCPPORT Port,
                     IN PUCHAR PortAddress,
                     IN ULONG BaudRate);
 
+XTAPI
+XTSTATUS
+HlInitializeDisplay(VOID);
+
 #endif /* __XTDK_HLFUNCS_H */

sdk/xtdk/hltypes.h

@@ -98,4 +98,16 @@ typedef struct _CPPORT
     USHORT Flags;
 } CPPORT, *PCPPORT;
 
+typedef struct _HAL_FRAMEBUFFER_DATA
+{
+    BOOLEAN Initialized;
+    PULONG Address;
+    ULONG_PTR BufferSize;
+    UINT Width;
+    UINT Height;
+    UINT PixelsPerScanLine;
+    UINT BitsPerPixel;
+    UINT Pitch;
+} HAL_FRAMEBUFFER_DATA, *PHAL_FRAMEBUFFER_DATA;
+
 #endif /* __XTDK_HLTYPES_H */

xtoskrnl/CMakeLists.txt

@@ -9,6 +9,7 @@ include_directories(
 # Specify list of source code files
 list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/hl/cport.c
+    ${XTOSKRNL_SOURCE_DIR}/hl/efifb.c
     ${XTOSKRNL_SOURCE_DIR}/hl/${ARCH}/cpufunc.c
     ${XTOSKRNL_SOURCE_DIR}/ke/globals.c
     ${XTOSKRNL_SOURCE_DIR}/ke/krnlinit.c

xtoskrnl/hl/efifb.c

@@ -0,0 +1,118 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/hl/efifb.c
+ * DESCRIPTION:     EFI framebuffer support
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <xtos.h>
+
+
+/**
+ * Clears the screen by drawing a filled black box.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+HlClearScreen(VOID)
+{
+    SIZE_T PositionX, PositionY;
+
+    /* Fill the screen with a black box */
+    for(PositionX = 0; PositionX < HlpFrameBufferData.Width; PositionX++)
+    {
+        for(PositionY = 0; PositionY < HlpFrameBufferData.Height; PositionY++)
+        {
+            HlDrawPixel(PositionX, PositionY, 0x00000000);
+        }
+    }
+}
+
+/**
+ * Draw a pixel on the screen at the given position and color.
+ *
+ * @param PositionX
+ *        Supplies the X coordinate of the pixel.
+ *
+ * @param PositionY
+ *        Supplies the Y coordinate of the pixel.
+ *
+ * @param Color
+ *        Specifies the color of the pixel.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+VOID
+HlDrawPixel(IN ULONG PositionX,
+            IN ULONG PositionY,
+            IN ULONG Color)
+{
+    /* Make sure frame buffer is already initialized */
+    if(HlpFrameBufferData.Initialized == FALSE)
+    {
+        /* Unable to operate on non-initialized frame buffer */
+        return;
+    }
+
+    /* Make sure point is not offscreen */
+    if(PositionX >= HlpFrameBufferData.Width || PositionY >= HlpFrameBufferData.Height || Color > 0xFFFFFFFF)
+    {
+        /* Invalid pixel position or color given */
+        return;
+    }
+
+    /* Calculate the index of the pixel in the frame buffer memory using the provided x and y coordinates */
+    SIZE_T FrameBufferIndex = PositionY * HlpFrameBufferData.PixelsPerScanLine + PositionX;
+
+    /* Set the color of the pixel by writing to the corresponding memory location */
+    HlpFrameBufferData.Address[FrameBufferIndex] = Color;
+}
+
+/**
+ * Initializes frame buffer display.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+XTSTATUS
+HlInitializeDisplay(VOID)
+{
+    /* Check if display already initialized */
+    if(HlpFrameBufferData.Initialized)
+    {
+        /* Nothing to do */
+        return STATUS_SUCCESS;
+    }
+
+    /* Check if framebuffer initialized by bootloader */
+    if(!KeInitializationBlock->LoaderInformation.FrameBuffer.Initialized ||
+       !KeInitializationBlock->LoaderInformation.FrameBuffer.Address)
+    {
+        /* Display not initialized */
+        return STATUS_DEVICE_NOT_READY;
+    }
+
+    /* Save framebuffer information and mark display as initialized */
+    HlpFrameBufferData.Address = (PULONG)KeInitializationBlock->LoaderInformation.FrameBuffer.Address;
+    HlpFrameBufferData.Width = KeInitializationBlock->LoaderInformation.FrameBuffer.Width;
+    HlpFrameBufferData.Height = KeInitializationBlock->LoaderInformation.FrameBuffer.Height;
+    HlpFrameBufferData.BitsPerPixel = KeInitializationBlock->LoaderInformation.FrameBuffer.BitsPerPixel;
+    HlpFrameBufferData.PixelsPerScanLine = KeInitializationBlock->LoaderInformation.FrameBuffer.PixelsPerScanLine;
+    HlpFrameBufferData.Pitch = KeInitializationBlock->LoaderInformation.FrameBuffer.Pitch;
+    HlpFrameBufferData.Initialized = TRUE;
+
+    /* Clear screen */
+    HlClearScreen();
+
+    /* Return success */
+    return STATUS_SUCCESS;
+}

xtoskrnl/includes/globals.h

@@ -12,6 +12,9 @@
 #include <xtos.h>
 
 
+/* FrameBuffer information */
+EXTERN HAL_FRAMEBUFFER_DATA HlpFrameBufferData;
+
 /* Kernel initialization block passed by boot loader */
 EXTERN PKERNEL_INITIALIZATION_BLOCK KeInitializationBlock;
 

xtoskrnl/ke/globals.c

@@ -9,6 +9,9 @@
 #include <xtos.h>
 
 
+/* FrameBuffer information */
+HAL_FRAMEBUFFER_DATA HlpFrameBufferData;
+
 /* Kernel initialization block passed by boot loader */
 PKERNEL_INITIALIZATION_BLOCK KeInitializationBlock;