1 /*
2  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
3  */
4 #ifndef _ASM_POWERPC_RUNLATCH_H
5 #define _ASM_POWERPC_RUNLATCH_H
6 
7 #ifdef CONFIG_PPC64
8 
9 extern void __ppc64_runlatch_on(void);
10 extern void __ppc64_runlatch_off(void);
11 
12 /*
13  * We manually hard enable-disable, this is called
14  * in the idle loop and we don't want to mess up
15  * with soft-disable/enable & interrupt replay.
16  */
17 #define ppc64_runlatch_off()					\
18 	do {							\
19 		if (cpu_has_feature(CPU_FTR_CTRL) &&		\
20 		    test_thread_local_flags(_TLF_RUNLATCH)) {	\
21 			unsigned long msr = mfmsr();		\
22 			__hard_irq_disable();			\
23 			__ppc64_runlatch_off();			\
24 			if (msr & MSR_EE)			\
25 				__hard_irq_enable();		\
26 		}      						\
27 	} while (0)
28 
29 #define ppc64_runlatch_on()					\
30 	do {							\
31 		if (cpu_has_feature(CPU_FTR_CTRL) &&		\
32 		    !test_thread_local_flags(_TLF_RUNLATCH)) {	\
33 			unsigned long msr = mfmsr();		\
34 			__hard_irq_disable();			\
35 			__ppc64_runlatch_on();			\
36 			if (msr & MSR_EE)			\
37 				__hard_irq_enable();		\
38 		}      						\
39 	} while (0)
40 #else
41 #define ppc64_runlatch_on()
42 #define ppc64_runlatch_off()
43 #endif /* CONFIG_PPC64 */
44 
45 #endif /* _ASM_POWERPC_RUNLATCH_H */
46