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Linux kernel mirror (for testing)
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linux
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#ifdef CONFIG_PPC64
15
16/*
17 * PACA flags in paca->irq_happened.
18 *
19 * This bits are set when interrupts occur while soft-disabled
20 * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
21 * is set whenever we manually hard disable.
22 */
23#define PACA_IRQ_HARD_DIS 0x01
24#define PACA_IRQ_DBELL 0x02
25#define PACA_IRQ_EE 0x04
26#define PACA_IRQ_DEC 0x08 /* Or FIT */
27#define PACA_IRQ_EE_EDGE 0x10 /* BookE only */
28
29#endif /* CONFIG_PPC64 */
30
31#ifndef __ASSEMBLY__
32
33extern void __replay_interrupt(unsigned int vector);
34
35extern void timer_interrupt(struct pt_regs *);
36extern void performance_monitor_exception(struct pt_regs *regs);
37extern void WatchdogException(struct pt_regs *regs);
38extern void unknown_exception(struct pt_regs *regs);
39
40#ifdef CONFIG_PPC64
41#include <asm/paca.h>
42
43static inline unsigned long arch_local_save_flags(void)
44{
45 unsigned long flags;
46
47 asm volatile(
48 "lbz %0,%1(13)"
49 : "=r" (flags)
50 : "i" (offsetof(struct paca_struct, soft_enabled)));
51
52 return flags;
53}
54
55static inline unsigned long arch_local_irq_disable(void)
56{
57 unsigned long flags, zero;
58
59 asm volatile(
60 "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
61 : "=r" (flags), "=&r" (zero)
62 : "i" (offsetof(struct paca_struct, soft_enabled))
63 : "memory");
64
65 return flags;
66}
67
68extern void arch_local_irq_restore(unsigned long);
69
70static inline void arch_local_irq_enable(void)
71{
72 arch_local_irq_restore(1);
73}
74
75static inline unsigned long arch_local_irq_save(void)
76{
77 return arch_local_irq_disable();
78}
79
80static inline bool arch_irqs_disabled_flags(unsigned long flags)
81{
82 return flags == 0;
83}
84
85static inline bool arch_irqs_disabled(void)
86{
87 return arch_irqs_disabled_flags(arch_local_save_flags());
88}
89
90#ifdef CONFIG_PPC_BOOK3E
91#define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory")
92#define __hard_irq_disable() asm volatile("wrteei 0" : : : "memory")
93#else
94#define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
95#define __hard_irq_disable() __mtmsrd(local_paca->kernel_msr, 1)
96#endif
97
98#define hard_irq_disable() do { \
99 u8 _was_enabled; \
100 __hard_irq_disable(); \
101 _was_enabled = local_paca->soft_enabled; \
102 local_paca->soft_enabled = 0; \
103 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; \
104 if (_was_enabled) \
105 trace_hardirqs_off(); \
106} while(0)
107
108static inline bool lazy_irq_pending(void)
109{
110 return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
111}
112
113/*
114 * This is called by asynchronous interrupts to conditionally
115 * re-enable hard interrupts when soft-disabled after having
116 * cleared the source of the interrupt
117 */
118static inline void may_hard_irq_enable(void)
119{
120 get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
121 if (!(get_paca()->irq_happened & PACA_IRQ_EE))
122 __hard_irq_enable();
123}
124
125static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
126{
127 return !regs->softe;
128}
129
130extern bool prep_irq_for_idle(void);
131
132#else /* CONFIG_PPC64 */
133
134#define SET_MSR_EE(x) mtmsr(x)
135
136static inline unsigned long arch_local_save_flags(void)
137{
138 return mfmsr();
139}
140
141static inline void arch_local_irq_restore(unsigned long flags)
142{
143#if defined(CONFIG_BOOKE)
144 asm volatile("wrtee %0" : : "r" (flags) : "memory");
145#else
146 mtmsr(flags);
147#endif
148}
149
150static inline unsigned long arch_local_irq_save(void)
151{
152 unsigned long flags = arch_local_save_flags();
153#ifdef CONFIG_BOOKE
154 asm volatile("wrteei 0" : : : "memory");
155#else
156 SET_MSR_EE(flags & ~MSR_EE);
157#endif
158 return flags;
159}
160
161static inline void arch_local_irq_disable(void)
162{
163#ifdef CONFIG_BOOKE
164 asm volatile("wrteei 0" : : : "memory");
165#else
166 arch_local_irq_save();
167#endif
168}
169
170static inline void arch_local_irq_enable(void)
171{
172#ifdef CONFIG_BOOKE
173 asm volatile("wrteei 1" : : : "memory");
174#else
175 unsigned long msr = mfmsr();
176 SET_MSR_EE(msr | MSR_EE);
177#endif
178}
179
180static inline bool arch_irqs_disabled_flags(unsigned long flags)
181{
182 return (flags & MSR_EE) == 0;
183}
184
185static inline bool arch_irqs_disabled(void)
186{
187 return arch_irqs_disabled_flags(arch_local_save_flags());
188}
189
190#define hard_irq_disable() arch_local_irq_disable()
191
192static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
193{
194 return !(regs->msr & MSR_EE);
195}
196
197static inline void may_hard_irq_enable(void) { }
198
199#endif /* CONFIG_PPC64 */
200
201#define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST
202
203/*
204 * interrupt-retrigger: should we handle this via lost interrupts and IPIs
205 * or should we not care like we do now ? --BenH.
206 */
207struct irq_chip;
208
209#endif /* __ASSEMBLY__ */
210#endif /* __KERNEL__ */
211#endif /* _ASM_POWERPC_HW_IRQ_H */