From 77a5cc6b1391df8aa63589c3b4c5efd2627296e9 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Mon, 9 Jun 2008 13:11:46 +0100
Subject: [ELF] Add ability to boot ELF images generated by wraplinux and
 mkelfImage

Delete ELF as a generic image type.  The method for invoking an
ELF-based image (as well as any tables that must be set up to allow it
to boot) will always depend on the specific architecture.  core/elf.c
now only provides the elf_load() function, to avoid duplicating
functionality between ELF-based image types.

Add arch/i386/image/elfboot.c, to handle the generic case of 32-bit
x86 ELF images.  We don't currently set up any multiboot tables, ELF
notes, etc.  This seems to be sufficient for loading kernels generated
using both wraplinux and coreboot's mkelfImage.

Note that while Etherboot 5.4 allowed ELF images to return, we don't.
There is no callback mechanism for the loaded image to shut down gPXE,
which means that we have to shut down before invoking the image.  This
means that we lose device state, protection against being trampled on,
etc.  It is not safe to continue afterwards.
---
 src/include/gpxe/features.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/include')

diff --git a/src/include/gpxe/features.h b/src/include/gpxe/features.h
index a520131f1..54498b5fa 100644
--- a/src/include/gpxe/features.h
+++ b/src/include/gpxe/features.h
@@ -43,6 +43,7 @@
 #define DHCP_EB_FEATURE_MULTIBOOT	0x19 /**< Multiboot format */
 #define DHCP_EB_FEATURE_NBI		0x20 /**< NBI format */
 #define DHCP_EB_FEATURE_PXE		0x21 /**< PXE format */
+#define DHCP_EB_FEATURE_ELF		0x22 /**< ELF format */
 
 /** @} */
 
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