x86_64 EFI boot support: EFI frame buffer driver

This patch adds Graphics Output Protocol support to the kernel.  UEFI2.0 spec
deprecates Universal Graphics Adapter (UGA) protocol and only Graphics Output
Protocol (GOP) is produced.  Therefore, the boot loader needs to query the
UEFI firmware with appropriate Output Protocol and pass the video information
to the kernel.  As a result of GOP protocol, an EFI framebuffer driver is
needed for displaying console messages.  The patch adds a EFI framebuffer
driver.  The EFI frame buffer driver in this patch is based on the Intel Mac
framebuffer driver.

The ELILO bootloader takes care of passing the video information as
appropriate for EFI firmware.

The framebuffer driver has been tested in i386 kernel and x86_64 kernel on EFI
platform.

Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@suse.de>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 7d86e9eae915..5b3dbcfcda48 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -641,6 +641,17 @@ config FB_VESA
           You will get a boot time penguin logo at no additional cost. Please
           read <file:Documentation/fb/vesafb.txt>. If unsure, say Y.
 
+config FB_EFI
+        bool "EFI-based Framebuffer Support"
+        depends on (FB = y) && X86
+        select FB_CFB_FILLRECT
+        select FB_CFB_COPYAREA
+        select FB_CFB_IMAGEBLIT
+        help
+          This is the EFI frame buffer device driver. If the firmware on
+          your platform is UEFI2.0, select Y to add support for
+          Graphics Output Protocol for early console messages to appear.
+
 config FB_IMAC
         bool "Intel-based Macintosh Framebuffer Support"
         depends on (FB = y) && X86 && EFI