diff options
Diffstat (limited to 'lib/efi_loader/efi_gop.c')
| -rw-r--r-- | lib/efi_loader/efi_gop.c | 32 |
1 files changed, 27 insertions, 5 deletions
diff --git a/lib/efi_loader/efi_gop.c b/lib/efi_loader/efi_gop.c index 154f306540..ac92109f16 100644 --- a/lib/efi_loader/efi_gop.c +++ b/lib/efi_loader/efi_gop.c @@ -77,6 +77,24 @@ static inline u16 efi_blt_col_to_vid16(struct efi_gop_pixel *blt) (u16)(blt->blue >> 3); } +/* + * Copy rectangle. + * + * This function implements the Blt service of the EFI_GRAPHICS_OUTPUT_PROTOCOL. + * See the Unified Extensible Firmware Interface (UEFI) specification for + * details. + * + * @this: EFI_GRAPHICS_OUTPUT_PROTOCOL + * @buffer: pixel buffer + * @sx: source x-coordinate + * @sy: source y-coordinate + * @dx: destination x-coordinate + * @dy: destination y-coordinate + * @width: width of rectangle + * @height: height of rectangle + * @delta: length in bytes of a line in the pixel buffer (optional) + * @return: status code + */ efi_status_t EFIAPI gop_blt(struct efi_gop *this, struct efi_gop_pixel *buffer, u32 operation, efi_uintn_t sx, efi_uintn_t sy, efi_uintn_t dx, @@ -88,14 +106,18 @@ efi_status_t EFIAPI gop_blt(struct efi_gop *this, struct efi_gop_pixel *buffer, u32 *fb32 = gopobj->fb; u16 *fb16 = gopobj->fb; - if (delta) - linelen = delta; - else - linelen = width; - EFI_ENTRY("%p, %p, %u, %zu, %zu, %zu, %zu, %zu, %zu, %zu", this, buffer, operation, sx, sy, dx, dy, width, height, delta); + if (delta) { + /* Check for 4 byte alignment */ + if (delta & 3) + return EFI_EXIT(EFI_INVALID_PARAMETER); + linelen = delta >> 2; + } else { + linelen = width; + } + /* Check source rectangle */ switch (operation) { case EFI_BLT_VIDEO_FILL: |