33 lines
631 B
ArmAsm
33 lines
631 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Userland implementation of getcpu() for 64 bits processes in a
|
|
* s390 kernel for use in the vDSO
|
|
*
|
|
* Copyright IBM Corp. 2016
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
#include <asm/vdso.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
.text
|
|
.align 4
|
|
.globl __kernel_getcpu
|
|
.type __kernel_getcpu,@function
|
|
__kernel_getcpu:
|
|
.cfi_startproc
|
|
la %r4,0
|
|
sacf 256
|
|
l %r5,__VDSO_CPU_NR(%r4)
|
|
l %r4,__VDSO_NODE_ID(%r4)
|
|
sacf 0
|
|
ltgr %r2,%r2
|
|
jz 2f
|
|
st %r5,0(%r2)
|
|
2: ltgr %r3,%r3
|
|
jz 3f
|
|
st %r4,0(%r3)
|
|
3: lghi %r2,0
|
|
br %r14
|
|
.cfi_endproc
|
|
.size __kernel_getcpu,.-__kernel_getcpu
|