1 /*
2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
3 */
4 #ifndef _ASM_POWERPC_HW_IRQ_H
5 #define _ASM_POWERPC_HW_IRQ_H
6
7 #ifdef __KERNEL__
8
9 #include <linux/errno.h>
10 #include <linux/compiler.h>
11 #include <asm/ptrace.h>
12 #include <asm/processor.h>
13
14 extern void timer_interrupt(struct pt_regs *);
15
16 #ifdef CONFIG_PPC64
17 #include <asm/paca.h>
18
arch_local_save_flags(void)19 static inline unsigned long arch_local_save_flags(void)
20 {
21 unsigned long flags;
22
23 asm volatile(
24 "lbz %0,%1(13)"
25 : "=r" (flags)
26 : "i" (offsetof(struct paca_struct, soft_enabled)));
27
28 return flags;
29 }
30
arch_local_irq_disable(void)31 static inline unsigned long arch_local_irq_disable(void)
32 {
33 unsigned long flags, zero;
34
35 asm volatile(
36 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
37 : "=r" (flags), "=&r" (zero)
38 : "i" (offsetof(struct paca_struct, soft_enabled))
39 : "memory");
40
41 return flags;
42 }
43
44 extern void arch_local_irq_restore(unsigned long);
45 extern void iseries_handle_interrupts(void);
46
arch_local_irq_enable(void)47 static inline void arch_local_irq_enable(void)
48 {
49 arch_local_irq_restore(1);
50 }
51
arch_local_irq_save(void)52 static inline unsigned long arch_local_irq_save(void)
53 {
54 return arch_local_irq_disable();
55 }
56
arch_irqs_disabled_flags(unsigned long flags)57 static inline bool arch_irqs_disabled_flags(unsigned long flags)
58 {
59 return flags == 0;
60 }
61
arch_irqs_disabled(void)62 static inline bool arch_irqs_disabled(void)
63 {
64 return arch_irqs_disabled_flags(arch_local_save_flags());
65 }
66
67 #ifdef CONFIG_PPC_BOOK3E
68 #define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory");
69 #define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory");
70 #else
71 #define __hard_irq_enable() __mtmsrd(mfmsr() | MSR_EE, 1)
72 #define __hard_irq_disable() __mtmsrd(mfmsr() & ~MSR_EE, 1)
73 #endif
74
75 #define hard_irq_disable() \
76 do { \
77 __hard_irq_disable(); \
78 get_paca()->soft_enabled = 0; \
79 get_paca()->hard_enabled = 0; \
80 } while(0)
81
82 #else /* CONFIG_PPC64 */
83
84 #define SET_MSR_EE(x) mtmsr(x)
85
arch_local_save_flags(void)86 static inline unsigned long arch_local_save_flags(void)
87 {
88 return mfmsr();
89 }
90
arch_local_irq_restore(unsigned long flags)91 static inline void arch_local_irq_restore(unsigned long flags)
92 {
93 #if defined(CONFIG_BOOKE)
94 asm volatile("wrtee %0" : : "r" (flags) : "memory");
95 #else
96 mtmsr(flags);
97 #endif
98 }
99
arch_local_irq_save(void)100 static inline unsigned long arch_local_irq_save(void)
101 {
102 unsigned long flags = arch_local_save_flags();
103 #ifdef CONFIG_BOOKE
104 asm volatile("wrteei 0" : : : "memory");
105 #else
106 SET_MSR_EE(flags & ~MSR_EE);
107 #endif
108 return flags;
109 }
110
arch_local_irq_disable(void)111 static inline void arch_local_irq_disable(void)
112 {
113 #ifdef CONFIG_BOOKE
114 asm volatile("wrteei 0" : : : "memory");
115 #else
116 arch_local_irq_save();
117 #endif
118 }
119
arch_local_irq_enable(void)120 static inline void arch_local_irq_enable(void)
121 {
122 #ifdef CONFIG_BOOKE
123 asm volatile("wrteei 1" : : : "memory");
124 #else
125 unsigned long msr = mfmsr();
126 SET_MSR_EE(msr | MSR_EE);
127 #endif
128 }
129
arch_irqs_disabled_flags(unsigned long flags)130 static inline bool arch_irqs_disabled_flags(unsigned long flags)
131 {
132 return (flags & MSR_EE) == 0;
133 }
134
arch_irqs_disabled(void)135 static inline bool arch_irqs_disabled(void)
136 {
137 return arch_irqs_disabled_flags(arch_local_save_flags());
138 }
139
140 #define hard_irq_disable() arch_local_irq_disable()
141
142 #endif /* CONFIG_PPC64 */
143
144 #define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST
145
146 /*
147 * interrupt-retrigger: should we handle this via lost interrupts and IPIs
148 * or should we not care like we do now ? --BenH.
149 */
150 struct irq_chip;
151
152 #endif /* __KERNEL__ */
153 #endif /* _ASM_POWERPC_HW_IRQ_H */
154