linux-kernel - [RFC] [PATCH 16/16] x86_64: Extend bzImage protocol for relocatable bzImage

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Date:	Mon, 13 Nov 2006 11:51:15 -0500
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	Reloc Kernel List <fastboot@...ts.osdl.org>, ebiederm@...ssion.com,
	akpm@...l.org, ak@...e.de, hpa@...or.com, magnus.damm@...il.com,
	lwang@...hat.com, dzickus@...hat.com
Subject: [RFC] [PATCH 16/16] x86_64: Extend bzImage protocol for relocatable bzImage




o Extend the bzImage protocol (same as i386) to allow bzImage loaders to
  load the protected mode kernel at non-1MB address. Now protected mode
  component is relocatable and can be loaded at non-1MB addresses.

o As of today kdump uses it to run a second kernel from a reserved memory
  area.

Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
---

 arch/x86_64/boot/setup.S |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff -puN arch/x86_64/boot/setup.S~x86_64-extend-bzImage-protocol-for-relocatable-bzImage arch/x86_64/boot/setup.S
--- linux-2.6.19-rc5-reloc/arch/x86_64/boot/setup.S~x86_64-extend-bzImage-protocol-for-relocatable-bzImage	2006-11-09 23:07:08.000000000 -0500
+++ linux-2.6.19-rc5-reloc-root/arch/x86_64/boot/setup.S	2006-11-09 23:07:08.000000000 -0500
@@ -80,7 +80,7 @@ start:
 # This is the setup header, and it must start at %cs:2 (old 0x9020:2)
 
 		.ascii	"HdrS"		# header signature
-		.word	0x0204		# header version number (>= 0x0105)
+		.word	0x0205		# header version number (>= 0x0105)
 					# or else old loadlin-1.5 will fail)
 realmode_swtch:	.word	0, 0		# default_switch, SETUPSEG
 start_sys_seg:	.word	SYSSEG
@@ -155,7 +155,12 @@ cmd_line_ptr:	.long 0			# (Header versio
 					# low memory 0x10000 or higher.
 
 ramdisk_max:	.long 0xffffffff
-	
+kernel_alignment:  .long 0x200000       # physical addr alignment required for
+					# protected mode relocatable kernel
+relocatable_kernel:    .byte 1
+pad2:                  .byte 0
+pad3:                  .word 0
+
 trampoline:	call	start_of_setup
 		.align 16
 					# The offset at this point is 0x240
_
-
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