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x86_64 EFI boot support: EFI frame buffer driver

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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>
This commit is contained in:
Huang, Ying 2007-11-28 16:21:55 -08:00 • committed by Linus Torvalds
parent f78ba15705
commit 7c83172b98
4 changed files with 246 additions and 0 deletions
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2
include/linux/screen_info.h
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@ -63,6 +63,8 @@ struct screen_info {
#define VIDEO_TYPE_PMAC 0x60 /* PowerMacintosh frame buffer. */
#define VIDEO_TYPE_EFI 0x70 /* EFI graphic mode */
#ifdef __KERNEL__
extern struct screen_info screen_info;