| /* 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> | |
| #include <asm/dwarf.h> | |
| .text | |
| .align 4 | |
| .globl __kernel_getcpu | |
| .type __kernel_getcpu,@function | |
| __kernel_getcpu: | |
| CFI_STARTPROC | |
| sacf 256 | |
| lm %r4,%r5,__VDSO_GETCPU_VAL(%r0) | |
| 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 |