Skip to content

Commit

Permalink
x86, realmode: Remove indirect jumps in trampoline_64.S
Browse files Browse the repository at this point in the history
Remove indirect jumps in trampoline_64.S which are no longer
necessary: the realmode code can relocate the absolute jumps
correctly from the start.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-13-git-send-email-jarkko.sakkinen@intel.com
  • Loading branch information
H. Peter Anvin committed May 8, 2012
1 parent f7436a9 commit 056a43a
Showing 1 changed file with 2 additions and 13 deletions.
15 changes: 2 additions & 13 deletions arch/x86/realmode/rm/trampoline_64.S
Original file line number Diff line number Diff line change
Expand Up @@ -73,7 +73,7 @@ ENTRY(trampoline_data)
lmsw %ax # into protected mode

# flush prefetch and jump to startup_32
ljmpl *(startup_32_vector)
ljmpl $__KERNEL32_CS, $pa_startup_32

no_longmode:
hlt
Expand Down Expand Up @@ -113,7 +113,7 @@ ENTRY(startup_32)
* EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we use
* the new gdt/idt that has __KERNEL_CS with CS.L = 1.
*/
ljmpl *(pa_startup_64_vector)
ljmpl $__KERNEL_CS, $pa_startup_64

.section ".text64","ax"
.code64
Expand Down Expand Up @@ -144,17 +144,6 @@ tgdt:
.quad 0x00cf93000000ffff # __KERNEL_DS
tgdt_end:

.balign 4
startup_32_vector:
.long pa_startup_32
.word __KERNEL32_CS, 0

.balign 4
.globl startup_64_vector
startup_64_vector:
.long pa_startup_64
.word __KERNEL_CS, 0

.data
.balign 4
GLOBAL(trampoline_status)
Expand Down

0 comments on commit 056a43a

Please sign in to comment.