projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 249c543b MS |
2 | /* |
| 3 | * Userland implementation of getcpu() for 64 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 | llilh %r4,0x0100 | |
| 20 | sar %a4,%r4 | |
| 21 | la %r4,0 | |
| 22 | epsw %r0,0 | |
| 23 | sacf 512 | |
| 24 | l %r5,__VDSO_CPU_NR(%r4) | |
| 25 | l %r4,__VDSO_NODE_ID(%r4) | |
| 26 | tml %r0,0x4000 | |
| 27 | jo 1f | |
| 28 | tml %r0,0x8000 | |
| 29 | jno 0f | |
| 30 | sacf 256 | |
| 31 | j 1f | |
| 32 | 0: sacf 0 | |
| 33 | 1: sar %a4,%r1 | |
| 34 | ltgr %r2,%r2 | |
| 35 | jz 2f | |
| 36 | st %r5,0(%r2) | |
| 37 | 2: ltgr %r3,%r3 | |
| 38 | jz 3f | |
| 39 | st %r4,0(%r3) | |
| 40 | 3: lghi %r2,0 | |
| 41 | br %r14 | |
| 42 | .cfi_endproc | |
| 43 | .size __kernel_getcpu,.-__kernel_getcpu |