1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_INTERRUPT_H
#define _ASM_POWERPC_INTERRUPT_H
#include <linux/context_tracking.h>
#include <asm/ftrace.h>
struct interrupt_state {
};
static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state)
{
}
/*
* Care should be taken to note that interrupt_exit_prepare and
* interrupt_async_exit_prepare do not necessarily return immediately to
* regs context (e.g., if regs is usermode, we don't necessarily return to
* user mode). Other interrupts might be taken between here and return,
* context switch / preemption may occur in the exit path after this, or a
* signal may be delivered, etc.
*
* The real interrupt exit code is platform specific, e.g.,
* interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s.
*
* However interrupt_nmi_exit_prepare does return directly to regs, because
* NMIs do not do "exit work" or replay soft-masked interrupts.
*/
static inline void interrupt_exit_prepare(struct pt_regs *regs, struct interrupt_state *state)
{
}
static inline void interrupt_async_enter_prepare(struct pt_regs *regs, struct interrupt_state *state)
{
}
static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct interrupt_state *state)
{
}
struct interrupt_nmi_state {
};
static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
{
}
static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
{
}
/**
* DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*/
#define DECLARE_INTERRUPT_HANDLER_RAW(func) \
__visible long func(struct pt_regs *regs)
/**
* DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*
* @func is called from ASM entry code.
*
* This is a plain function which does no tracing, reconciling, etc.
* The macro is written so it acts as function definition. Append the
* body with a pair of curly brackets.
*
* raw interrupt handlers must not enable or disable interrupts, or
* schedule, tracing and instrumentation (ftrace, lockdep, etc) would
* not be advisable either, although may be possible in a pinch, the
* trace will look odd at least.
*
* A raw handler may call one of the other interrupt handler functions
* to be converted into that interrupt context without these restrictions.
*
* On PPC64, _RAW handlers may return with fast_interrupt_return.
*
* Specific handlers may have additional restrictions.
*/
#define DEFINE_INTERRUPT_HANDLER_RAW(func) \
static __always_inline long ____##func(struct pt_regs *regs); \
\
__visible noinstr long func(struct pt_regs *regs) \
{ \
long ret; \
\
ret = ____##func (regs); \
\
return ret; \
} \
\
static __always_inline long ____##func(struct pt_regs *regs)
/**
* DECLARE_INTERRUPT_HANDLER - Declare synchronous interrupt handler function
* @func: Function name of the entry point
*/
#define DECLARE_INTERRUPT_HANDLER(func) \
__visible void func(struct pt_regs *regs)
/**
* DEFINE_INTERRUPT_HANDLER - Define synchronous interrupt handler function
* @func: Function name of the entry point
*
* @func is called from ASM entry code.
*
* The macro is written so it acts as function definition. Append the
* body with a pair of curly brackets.
*/
#define DEFINE_INTERRUPT_HANDLER(func) \
static __always_inline void ____##func(struct pt_regs *regs); \
\
__visible noinstr void func(struct pt_regs *regs) \
{ \
struct interrupt_state state; \
\
interrupt_enter_prepare(regs, &state); \
\
____##func (regs); \
\
interrupt_exit_prepare(regs, &state); \
} \
\
static __always_inline void ____##func(struct pt_regs *regs)
/**
* DECLARE_INTERRUPT_HANDLER_RET - Declare synchronous interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*/
#define DECLARE_INTERRUPT_HANDLER_RET(func) \
__visible long func(struct pt_regs *regs)
/**
* DEFINE_INTERRUPT_HANDLER_RET - Define synchronous interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*
* @func is called from ASM entry code.
*
* The macro is written so it acts as function definition. Append the
* body with a pair of curly brackets.
*/
#define DEFINE_INTERRUPT_HANDLER_RET(func) \
static __always_inline long ____##func(struct pt_regs *regs); \
\
__visible noinstr long func(struct pt_regs *regs) \
{ \
struct interrupt_state state; \
long ret; \
\
interrupt_enter_prepare(regs, &state); \
\
ret = ____##func (regs); \
\
interrupt_exit_prepare(regs, &state); \
\
return ret; \
} \
\
static __always_inline long ____##func(struct pt_regs *regs)
/**
* DECLARE_INTERRUPT_HANDLER_ASYNC - Declare asynchronous interrupt handler function
* @func: Function name of the entry point
*/
#define DECLARE_INTERRUPT_HANDLER_ASYNC(func) \
__visible void func(struct pt_regs *regs)
/**
* DEFINE_INTERRUPT_HANDLER_ASYNC - Define asynchronous interrupt handler function
* @func: Function name of the entry point
*
* @func is called from ASM entry code.
*
* The macro is written so it acts as function definition. Append the
* body with a pair of curly brackets.
*/
#define DEFINE_INTERRUPT_HANDLER_ASYNC(func) \
static __always_inline void ____##func(struct pt_regs *regs); \
\
__visible noinstr void func(struct pt_regs *regs) \
{ \
struct interrupt_state state; \
\
interrupt_async_enter_prepare(regs, &state); \
\
____##func (regs); \
\
interrupt_async_exit_prepare(regs, &state); \
} \
\
static __always_inline void ____##func(struct pt_regs *regs)
/**
* DECLARE_INTERRUPT_HANDLER_NMI - Declare NMI interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*/
#define DECLARE_INTERRUPT_HANDLER_NMI(func) \
__visible long func(struct pt_regs *regs)
/**
* DEFINE_INTERRUPT_HANDLER_NMI - Define NMI interrupt handler function
* @func: Function name of the entry point
* @returns: Returns a value back to asm caller
*
* @func is called from ASM entry code.
*
* The macro is written so it acts as function definition. Append the
* body with a pair of curly brackets.
*/
#define DEFINE_INTERRUPT_HANDLER_NMI(func) \
static __always_inline long ____##func(struct pt_regs *regs); \
\
__visible noinstr long func(struct pt_regs *regs) \
{ \
struct interrupt_nmi_state state; \
long ret; \
\
interrupt_nmi_enter_prepare(regs, &state); \
\
ret = ____##func (regs); \
\
interrupt_nmi_exit_prepare(regs, &state); \
\
return ret; \
} \
\
static __always_inline long ____##func(struct pt_regs *regs)
#endif /* _ASM_POWERPC_INTERRUPT_H */
|
