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x86, boot: Move verify_cpu.S and no_longmode down 

We need to move some code to 32bit section in following patch:

   x86, boot: Move lldt/ltr out of 64bit code section

but that will push startup_64 down from 0x200.

According to hpa, we can not change startup_64 position and that
is an ABI.

We could move function verify_cpu and no_longmode down, because
verify_cpu is used via function call and no_longmode will not
return, then we don't need to add extra code for jumping back.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-20-git-send-email-yinghai@kernel.org
Cc: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2013-01-24 12:20:00 -08:00 committed by H. Peter Anvin
parent 3db07e70f0
commit 187a8a73ce
1 changed files with 9 additions and 8 deletions
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17
arch/x86/boot/compressed/head_64.S
View File

@ -176,14 +176,6 @@ ENTRY(startup_32)
lret
ENDPROC(startup_32)
no_longmode:
/* This isn't an x86-64 CPU so hang */
1:
hlt
jmp 1b
#include "../../kernel/verify_cpu.S"
/*
* Be careful here startup_64 needs to be at a predictable
* address so I can export it in an ELF header. Bootloaders
@ -349,6 +341,15 @@ relocated:
*/
jmp *%rbp
.code32
no_longmode:
/* This isn't an x86-64 CPU so hang */
1:
hlt
jmp 1b
#include "../../kernel/verify_cpu.S"
.data
gdt:
.word gdt_end - gdt