xref: /openbmc/linux/arch/sparc/include/asm/current.h (revision b4e18b29)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* include/asm/current.h
3  *
4  * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
5  * Copyright (C) 2002 Pete Zaitcev (zaitcev@yahoo.com)
6  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
7  *
8  *  Derived from "include/asm-s390/current.h" by
9  *  Martin Schwidefsky (schwidefsky@de.ibm.com)
10  *  Derived from "include/asm-i386/current.h"
11 */
12 #ifndef _SPARC_CURRENT_H
13 #define _SPARC_CURRENT_H
14 
15 #include <linux/thread_info.h>
16 
17 #ifdef CONFIG_SPARC64
18 register struct task_struct *current asm("g4");
19 #endif
20 
21 #ifdef CONFIG_SPARC32
22 /* We might want to consider using %g4 like sparc64 to shave a few cycles.
23  *
24  * Two stage process (inline + #define) for type-checking.
25  * We also obfuscate get_current() to check if anyone used that by mistake.
26  */
27 struct task_struct;
28 static inline struct task_struct *__get_current(void)
29 {
30 	return current_thread_info()->task;
31 }
32 #define current __get_current()
33 #endif
34 
35 #endif /* !(_SPARC_CURRENT_H) */
36