mirror of https://gitee.com/openkylin/linux.git
59 lines
1.3 KiB
ArmAsm
59 lines
1.3 KiB
ArmAsm
/*
|
|
* 31-bit switch cpu code
|
|
*
|
|
* Copyright IBM Corp. 2009
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
# smp_switch_to_cpu switches to destination cpu and executes the passed function
|
|
# Parameter: %r2 - function to call
|
|
# %r3 - function parameter
|
|
# %r4 - stack poiner
|
|
# %r5 - current cpu
|
|
# %r6 - destination cpu
|
|
|
|
.section .text
|
|
ENTRY(smp_switch_to_cpu)
|
|
stm %r6,%r15,__SF_GPRS(%r15)
|
|
lr %r1,%r15
|
|
ahi %r15,-STACK_FRAME_OVERHEAD
|
|
st %r1,__SF_BACKCHAIN(%r15)
|
|
basr %r13,0
|
|
0: la %r1,.gprregs_addr-0b(%r13)
|
|
l %r1,0(%r1)
|
|
stm %r0,%r15,0(%r1)
|
|
1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
|
|
brc 2,1b /* busy, try again */
|
|
2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
|
|
brc 2,2b /* busy, try again */
|
|
3: j 3b
|
|
|
|
ENTRY(smp_restart_cpu)
|
|
basr %r13,0
|
|
0: la %r1,.gprregs_addr-0b(%r13)
|
|
l %r1,0(%r1)
|
|
lm %r0,%r15,0(%r1)
|
|
1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
|
|
brc 10,1b /* busy, accepted (status 0), running */
|
|
tmll %r0,0x40 /* Test if calling CPU is stopped */
|
|
jz 1b
|
|
ltr %r4,%r4 /* New stack ? */
|
|
jz 1f
|
|
lr %r15,%r4
|
|
1: lr %r14,%r2 /* r14: Function to call */
|
|
lr %r2,%r3 /* r2 : Parameter for function*/
|
|
basr %r14,%r14 /* Call function */
|
|
|
|
.gprregs_addr:
|
|
.long .gprregs
|
|
|
|
.section .data,"aw",@progbits
|
|
.gprregs:
|
|
.rept 16
|
|
.long 0
|
|
.endr
|