current.h

 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) */