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
|
/****************************************************************************
* arch/avr/include/avr32/irq.h
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/* This file should never be included directed but, rather, only indirectly
* through nuttx/irq.h
*/
#ifndef __ARCH_AVR_INCLUDE_AVR32_IRQ_H
#define __ARCH_AVR_INCLUDE_AVR32_IRQ_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/irq.h>
#include <arch/avr32/avr32.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* General notes about the AVR32 ABI:
*
* Scratch/Volatile Registers: r8-r12
* Preserved/Static Registers: r0-r7
* Parameter Passing: r12-R8 (in that order)
*/
/* Register state save array indices.
*
* The following registers are saved by the AVR32 hardware (for the case of
* interrupts only). Note the registers are order in the opposite order the
* they appear in memory (i.e., in the order of increasing address) because
* this makes it easier to following the ordering of pushing on a push-down
* stack.
*/
#define REG_R8 16
#define REG_R9 15
#define REG_R10 14
#define REG_R11 13
#define REG_R12 12
#define REG_R14 11
#define REG_R15 10
#define REG_SR 9
#define REG_LR REG_R14
#define REG_PC REG_R15
/* Additional registers saved in order have the full CPU context */
#define REG_R13 8
#define REG_SP REG_R13
#define REG_R0 7
#define REG_R1 6
#define REG_R2 5
#define REG_R3 4
#define REG_R4 3
#define REG_R5 2
#define REG_R6 1
#define REG_R7 0
/* Size of the register state save array (in 32-bit words) */
#define INTCONTEXT_REGS 8 /* r8-r12, lr, pc, sr */
#define XCPTCONTEXT_REGS 17 /* Plus r0-r7, sp */
/****************************************************************************
* Public Types
****************************************************************************/
/* This struct defines the way the registers are stored. */
#ifndef __ASSEMBLY__
struct xcptcontext
{
/* The following function pointer is non-zero if there are pending signals
* to be processed.
*/
#ifndef CONFIG_DISABLE_SIGNALS
void *sigdeliver; /* Actual type is sig_deliver_t */
/* These are saved copies of PC and SR used during signal processing.*/
uint32_t saved_pc;
uint32_t saved_sr;
#endif
/* Register save area */
uint32_t regs[XCPTCONTEXT_REGS];
};
#endif
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/* Read the AVR32 status register */
static inline uint32_t avr32_sr(void)
{
uint32_t sr;
__asm__ __volatile__ (
"mfsr\t%0,%1\n\t"
: "=r" (sr)
: "i" (AVR32_SR)
);
return sr;
}
/* Read the interrupt vector base address */
static inline uint32_t avr32_evba(void)
{
uint32_t evba;
__asm__ __volatile__ (
"mfsr\t%0,%1\n\t"
: "=r" (evba)
: "i" (AVR32_EVBA)
);
return evba;
}
/* Save the current interrupt enable state & disable all interrupts */
static inline irqstate_t irqsave(void)
{
irqstate_t sr = (irqstate_t)avr32_sr();
__asm__ __volatile__ (
"ssrf\t%0\n\t"
"nop\n\t"
"nop"
:
: "i" (AVR32_SR_GM_SHIFT)
);
return sr;
}
/* Restore saved interrupt state */
static inline void irqrestore(irqstate_t flags)
{
if ((flags & AVR32_SR_GM_MASK) == 0)
{
__asm__ __volatile__ (
"csrf\t%0\n\t"
"nop\n\t"
"nop"
:
: "i" (AVR32_SR_GM_SHIFT)
);
}
}
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif
#endif /* __ARCH_AVR_INCLUDE_AVR32_IRQ_H */
|
