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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
249c543b MS |
2 | /* |
3 | * Userland implementation of getcpu() for 32 bits processes in a | |
4 | * s390 kernel for use in the vDSO | |
5 | * | |
6 | * Copyright IBM Corp. 2016 | |
7 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
8 | */ | |
9 | #include <asm/vdso.h> | |
10 | #include <asm/asm-offsets.h> | |
11 | ||
12 | .text | |
13 | .align 4 | |
14 | .globl __kernel_getcpu | |
15 | .type __kernel_getcpu,@function | |
16 | __kernel_getcpu: | |
17 | .cfi_startproc | |
18 | ear %r1,%a4 | |
19 | lhi %r4,1 | |
20 | sll %r4,24 | |
21 | sar %a4,%r4 | |
22 | la %r4,0 | |
23 | epsw %r0,0 | |
24 | sacf 512 | |
25 | l %r5,__VDSO_CPU_NR(%r4) | |
26 | l %r4,__VDSO_NODE_ID(%r4) | |
27 | tml %r0,0x4000 | |
28 | jo 1f | |
29 | tml %r0,0x8000 | |
30 | jno 0f | |
31 | sacf 256 | |
32 | j 1f | |
33 | 0: sacf 0 | |
34 | 1: sar %a4,%r1 | |
35 | ltr %r2,%r2 | |
36 | jz 2f | |
37 | st %r5,0(%r2) | |
38 | 2: ltr %r3,%r3 | |
39 | jz 3f | |
40 | st %r4,0(%r3) | |
41 | 3: lhi %r2,0 | |
42 | br %r14 | |
43 | .cfi_endproc | |
44 | .size __kernel_getcpu,.-__kernel_getcpu |