| /* | |
| * 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 | |
| ear %r1,%a4 | |
| llilh %r4,0x0100 | |
| sar %a4,%r4 | |
| la %r4,0 | |
| epsw %r0,0 | |
| sacf 512 | |
| l %r5,__VDSO_CPU_NR(%r4) | |
| l %r4,__VDSO_NODE_ID(%r4) | |
| tml %r0,0x4000 | |
| jo 1f | |
| tml %r0,0x8000 | |
| jno 0f | |
| sacf 256 | |
| j 1f | |
| 0: sacf 0 | |
| 1: sar %a4,%r1 | |
| 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 |