Messages in this thread Patch in this message |  | | From | Yinghai Lu <> | Subject | [PATCH v6 03/27] x86, boot: move verify_cpu.S and no_longmode after 0x200 | Date | Thu, 13 Dec 2012 14:01:57 -0800 |
| |
We are short of space before 0x200 that is entry for startup_64.
According to hpa, we can not change startup_64 to other offset and that become ABI now.
We could move function verify_cpu and no_longmode down, because one is used via call and another will not return. So could avoid extra code of jmp back and forth if we would move other lines.
Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Matt Fleming <matt.fleming@intel.com> --- arch/x86/boot/compressed/head_64.S | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 2c4b171..fb984c0 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -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 -- 1.7.10.4
|  |