x86_64 EFI boot support: EFI frame buffer driver

PATCH New Huang, Ying 1 participant 1 message Nov 2, 2007 Framebuffer layer

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Huang, Ying

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2007-11-02 02:05 UTC #0 lore raw

PATCH 1/2 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 <[email protected]>

Signed-off-by Huang Ying <[email protected]>

---
 drivers/video/Kconfig       |   11 ++
 drivers/video/Makefile      |    1 
 drivers/video/efifb.c       |  232 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/screen_info.h |    2 
 4 files changed, 246 insertions(+)

include/linux/screen_info.h +2 -0

Index: linux-2.6.24-rc1/include/linux/screen_info.h
===================================================================
@@ -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;

drivers/video/Kconfig +11 -0

Index: linux-2.6.24-rc1/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

drivers/video/Makefile +1 -0

Index: linux-2.6.24-rc1/drivers/video/Makefile
===================================================================
@@ -118,6 +118,7 @@ obj-$(CONFIG_FB_OMAP)             += oma
 obj-$(CONFIG_FB_UVESA)            += uvesafb.o
 obj-$(CONFIG_FB_VESA)             += vesafb.o
 obj-$(CONFIG_FB_IMAC)             += imacfb.o
+obj-$(CONFIG_FB_EFI)              += efifb.o
 obj-$(CONFIG_FB_VGA16)            += vga16fb.o
 obj-$(CONFIG_FB_OF)               += offb.o
 obj-$(CONFIG_FB_BF54X_LQ043)	  += bf54x-lq043fb.o

drivers/video/efifb.c new file +232 -0

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