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43 lines
730 B
43 lines
730 B
/*
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* Userland implementation of getcpu() for 32 bits processes in a
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* s390 kernel for use in the vDSO
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*
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* Copyright IBM Corp. 2016
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <asm/vdso.h>
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#include <asm/asm-offsets.h>
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.text
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.align 4
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.globl __kernel_getcpu
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.type __kernel_getcpu,@function
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__kernel_getcpu:
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.cfi_startproc
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ear %r1,%a4
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lhi %r4,1
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sll %r4,24
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sar %a4,%r4
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la %r4,0
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epsw %r0,0
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sacf 512
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l %r5,__VDSO_CPU_NR(%r4)
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l %r4,__VDSO_NODE_ID(%r4)
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tml %r0,0x4000
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jo 1f
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tml %r0,0x8000
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jno 0f
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sacf 256
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j 1f
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0: sacf 0
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1: sar %a4,%r1
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ltr %r2,%r2
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jz 2f
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st %r5,0(%r2)
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2: ltr %r3,%r3
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jz 3f
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st %r4,0(%r3)
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3: lhi %r2,0
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br %r14
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.cfi_endproc
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.size __kernel_getcpu,.-__kernel_getcpu
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