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@@ -77,6 +77,24 @@ static inline u16 efi_blt_col_to_vid16(struct efi_gop_pixel *blt)
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(u16)(blt->blue >> 3);
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}
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+/*
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+ * Copy rectangle.
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+ *
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+ * This function implements the Blt service of the EFI_GRAPHICS_OUTPUT_PROTOCOL.
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+ * See the Unified Extensible Firmware Interface (UEFI) specification for
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+ * details.
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+ *
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+ * @this: EFI_GRAPHICS_OUTPUT_PROTOCOL
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+ * @buffer: pixel buffer
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+ * @sx: source x-coordinate
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+ * @sy: source y-coordinate
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+ * @dx: destination x-coordinate
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+ * @dy: destination y-coordinate
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+ * @width: width of rectangle
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+ * @height: height of rectangle
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+ * @delta: length in bytes of a line in the pixel buffer (optional)
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+ * @return: status code
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+ */
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efi_status_t EFIAPI gop_blt(struct efi_gop *this, struct efi_gop_pixel *buffer,
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u32 operation, efi_uintn_t sx,
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efi_uintn_t sy, efi_uintn_t dx,
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@@ -88,14 +106,18 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, struct efi_gop_pixel *buffer,
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u32 *fb32 = gopobj->fb;
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u16 *fb16 = gopobj->fb;
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- if (delta)
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- linelen = delta;
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- else
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- linelen = width;
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-
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EFI_ENTRY("%p, %p, %u, %zu, %zu, %zu, %zu, %zu, %zu, %zu", this,
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buffer, operation, sx, sy, dx, dy, width, height, delta);
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+ if (delta) {
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+ /* Check for 4 byte alignment */
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+ if (delta & 3)
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+ return EFI_EXIT(EFI_INVALID_PARAMETER);
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+ linelen = delta >> 2;
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+ } else {
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+ linelen = width;
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+ }
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+
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/* Check source rectangle */
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switch (operation) {
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case EFI_BLT_VIDEO_FILL:
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