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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "include/asm-i386/current.h"
8 */
9
10#ifndef _S390_CURRENT_H
11#define _S390_CURRENT_H
12
13#include <asm/lowcore.h>
14#include <asm/machine.h>
15
16struct task_struct;
17
18static __always_inline struct task_struct *get_current(void)
19{
20 unsigned long ptr, lc_current;
21
22 lc_current = offsetof(struct lowcore, current_task);
23 asm_inline(
24 ALTERNATIVE(" lg %[ptr],%[offzero](%%r0)\n",
25 " lg %[ptr],%[offalt](%%r0)\n",
26 ALT_FEATURE(MFEATURE_LOWCORE))
27 : [ptr] "=d" (ptr)
28 : [offzero] "i" (lc_current),
29 [offalt] "i" (lc_current + LOWCORE_ALT_ADDRESS));
30 return (struct task_struct *)ptr;
31}
32
33#define current get_current()
34
35#endif /* !(_S390_CURRENT_H) */