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
|
/************************************************************************************
* arch/z80/src/ez80/switch.h
* arch/z80/src/chip/switch.h
*
* Copyright (C) 2008-2009, 2011-2012 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.
*
************************************************************************************/
#ifndef __EZ80_SWITCH_H
#define __EZ80_SWITCH_H
/************************************************************************************
* Included Files
************************************************************************************/
#ifndef __ASSEMBLY__
# include <nuttx/sched.h>
# include <nuttx/arch.h>
#endif
#include "common/up_internal.h"
/************************************************************************************
* Definitions
************************************************************************************/
/* Macros for portability ***********************************************************
*
* Common logic in arch/z80/src/common is customized for the z8 context switching
* logic via the following macros.
*/
/* Initialize the IRQ state */
#define INIT_IRQCONTEXT() current_regs = NULL
/* IN_INTERRUPT returns true if the system is currently operating in the interrupt
* context. IN_INTERRUPT is the inline equivalent of up_interrupt_context().
*/
#define IN_INTERRUPT() (current_regs != NULL)
/* The following macro is used when the system enters interrupt handling logic
*
* NOTE: Nested interrupts are not supported in this implementation. If you want
* to implement nested interrupts, you would have to change the way that
* current_regs is handled. The savestate variable would not work for
* that purpose as implemented here because only the outermost nested
* interrupt can result in a context switch (it can probably be deleted).
*/
#define DECL_SAVESTATE() \
FAR chipreg_t *savestate
#define IRQ_ENTER(irq, regs) \
do { \
savestate = (FAR chipreg_t *)current_regs; \
current_regs = (regs); \
} while (0)
/* The following macro is used when the system exits interrupt handling logic */
#define IRQ_LEAVE(irq) current_regs = savestate
/* The following macro is used to sample the interrupt state (as a opaque handle) */
#define IRQ_STATE() (current_regs)
/* Save the current IRQ context in the specified TCB */
#define SAVE_IRQCONTEXT(tcb) ez80_copystate((tcb)->xcp.regs, (FAR chipreg_t*)current_regs)
/* Set the current IRQ context to the state specified in the TCB */
#define SET_IRQCONTEXT(tcb) ez80_copystate((FAR chipreg_t*)current_regs, (tcb)->xcp.regs)
/* Save the user context in the specified TCB. User context saves can be simpler
* because only those registers normally saved in a C called need be stored.
*/
#define SAVE_USERCONTEXT(tcb) ez80_saveusercontext((tcb)->xcp.regs)
/* Restore the full context -- either a simple user state save or the full,
* IRQ state save.
*/
#define RESTORE_USERCONTEXT(tcb) ez80_restorecontext((tcb)->xcp.regs)
/* Dump the current machine registers */
#define _REGISTER_DUMP() ez80_registerdump()
/************************************************************************************
* Public Types
************************************************************************************/
/************************************************************************************
* Public Variables
************************************************************************************/
#ifndef __ASSEMBLY__
/* This holds a references to the current interrupt level register storage structure.
* If is non-NULL only during interrupt processing.
*/
extern volatile chipreg_t *current_regs;
#endif
/************************************************************************************
* Public Function Prototypes
************************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
extern "C"
{
#endif
/* Defined in ez80_copystate.c */
void ez80_copystate(FAR chipreg_t *dest, FAR const chipreg_t *src);
/* Defined in ez80_saveusercontext.asm */
int ez80_saveusercontext(FAR chipreg_t *regs);
/* Defined in ez80_restorecontext.asm */
void ez80_restorecontext(FAR chipreg_t *regs);
/* Defined in ez80_sigsetup.c */
void ez80_sigsetup(FAR struct tcb_s *tcb, sig_deliver_t sigdeliver, chipreg_t *regs);
/* Defined in ez80_registerdump.c */
void ez80_registerdump(void);
#ifdef __cplusplus
}
#endif
#endif
#endif /* __EZ80_SWITCH_H */
|
