xref: /OK3568_Linux_fs/kernel/arch/powerpc/include/asm/current.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */
2*4882a593Smuzhiyun #ifndef _ASM_POWERPC_CURRENT_H
3*4882a593Smuzhiyun #define _ASM_POWERPC_CURRENT_H
4*4882a593Smuzhiyun #ifdef __KERNEL__
5*4882a593Smuzhiyun 
6*4882a593Smuzhiyun /*
7*4882a593Smuzhiyun  */
8*4882a593Smuzhiyun 
9*4882a593Smuzhiyun struct task_struct;
10*4882a593Smuzhiyun 
11*4882a593Smuzhiyun #ifdef __powerpc64__
12*4882a593Smuzhiyun #include <linux/stddef.h>
13*4882a593Smuzhiyun #include <asm/paca.h>
14*4882a593Smuzhiyun 
get_current(void)15*4882a593Smuzhiyun static inline struct task_struct *get_current(void)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun 	struct task_struct *task;
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun 	/* get_current can be cached by the compiler, so no volatile */
20*4882a593Smuzhiyun 	asm ("ld %0,%1(13)"
21*4882a593Smuzhiyun 	: "=r" (task)
22*4882a593Smuzhiyun 	: "i" (offsetof(struct paca_struct, __current)));
23*4882a593Smuzhiyun 
24*4882a593Smuzhiyun 	return task;
25*4882a593Smuzhiyun }
26*4882a593Smuzhiyun #define current	get_current()
27*4882a593Smuzhiyun 
28*4882a593Smuzhiyun #else
29*4882a593Smuzhiyun 
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun  * We keep `current' in r2 for speed.
32*4882a593Smuzhiyun  */
33*4882a593Smuzhiyun register struct task_struct *current asm ("r2");
34*4882a593Smuzhiyun 
35*4882a593Smuzhiyun #endif
36*4882a593Smuzhiyun 
37*4882a593Smuzhiyun #endif /* __KERNEL__ */
38*4882a593Smuzhiyun #endif /* _ASM_POWERPC_CURRENT_H */
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