xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sparc32: Implement hard_smp_processor_id() via instruction patching.

Browse Source 
This is the last non-trivial user of btfixup.

Like sparc64, use a special patch section to resolve the various
implementations of how to read the current CPU's ID when we don't
have current_thread_info()->cpu necessarily available.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
David S. Miller
2012-05-13 23:09:04 -07:00
parent 5d83d66635
commit c68e5d39a5
10 changed files with 99 additions and 175 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
arch/sparc/kernel/trampoline_32.S
View File

@@ -15,8 +15,8 @@
#include <asm/contregs.h>
#include <asm/thread_info.h>
.globl sun4m_cpu_startup, __smp4m_processor_id, __leon_processor_id
.globl sun4d_cpu_startup, __smp4d_processor_id
.globl sun4m_cpu_startup
.globl sun4d_cpu_startup
__CPUINIT
.align 4
@@ -94,24 +94,6 @@ smp_do_cpu_idle:
call cpu_panic
nop
__smp4m_processor_id:
rd %tbr, %g2
srl %g2, 12, %g2
and %g2, 3, %g2
retl
mov %g1, %o7
__smp4d_processor_id:
lda [%g0] ASI_M_VIKING_TMP1, %g2
retl
mov %g1, %o7
__leon_processor_id:
rd %asr17,%g2
srl %g2,28,%g2
retl
mov %g1, %o7
/* CPUID in bootbus can be found at PA 0xff0140000 */
#define SUN4D_BOOTBUS_CPUID 0xf0140000