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- /*
- * 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
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