[Fastboot] [RFC] [PATCH 16/16] x86_64: Extend bzImage protocol for relocatable bzImage

[Vivek Goyal]

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 <[EMAIL PROTECTED]>
---

 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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