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
|
/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file ivor.s
* @brief Kernel ISRs.
*
* @addtogroup PPC_CORE
* @{
*/
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
#if !defined(FALSE) || defined(__DOXYGEN__)
#define FALSE 0
#endif
#if !defined(TRUE) || defined(__DOXYGEN__)
#define TRUE 1
#endif
/*===========================================================================*/
/* Code section. */
/*===========================================================================*/
/*
* Imports the PPC configuration headers.
*/
#define _FROM_ASM_
#include "chlicense.h"
#include "chconf.h"
#include "chcore.h"
#if !defined(__DOXYGEN__)
.extern _stats_start_measure_crit_thd
.extern _stats_stop_measure_crit_thd
.extern _dbg_check_lock
.extern _dbg_check_unlock
.extern chSchIsPreemptionRequired
.extern chSchDoReschedule
.extern chSysTimerHandlerI
.section .handlers, text_vle
#if PPC_USE_VLE == TRUE
#if PPC_SUPPORTS_DECREMENTER
/*
* _IVOR10 handler (Book-E decrementer).
*/
.align 16
.globl _IVOR10
.type _IVOR10, @function
_IVOR10:
/* Saving the external context (port_extctx structure).*/
e_stwu r1, -80(r1)
e_stmvsrrw 8(r1) /* Saves PC, MSR. */
e_stmvsprw 16(r1) /* Saves CR, LR, CTR, XER. */
e_stmvgprw 32(r1) /* Saves GPR0, GPR3...GPR12. */
/* Increasing the SPGR0 register.*/
mfspr r0, 272
se_addi r0, 1
mtspr 272, r0
/* Reset DIE bit in TSR register.*/
e_lis r3, 0x0800 /* DIS bit mask. */
mtspr 336, r3 /* TSR register. */
/* Restoring pre-IRQ MSR register value.*/
mfSRR1 r0
#if !PPC_USE_IRQ_PREEMPTION
/* No preemption, keeping EE disabled.*/
se_bclri r0, 16 /* EE = bit 16. */
#endif
mtMSR r0
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_enter_isr
bl _dbg_check_lock_from_isr
#endif
/* System tick handler invocation.*/
e_bl chSysTimerHandlerI
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock_from_isr
bl _dbg_check_leave_isr
#endif
#if PPC_USE_IRQ_PREEMPTION
/* Prevents preemption again.*/
wrteei 0
#endif
/* Jumps to the common IVOR epilogue code.*/
se_b _ivor_exit
#endif /* PPC_SUPPORTS_DECREMENTER */
/*
* _IVOR4 handler (Book-E external interrupt).
*/
.align 16
.globl _IVOR4
.type _IVOR4, @function
_IVOR4:
/* Saving the external context (port_extctx structure).*/
e_stwu r1, -80(r1)
e_stmvsrrw 8(r1) /* Saves PC, MSR. */
e_stmvsprw 16(r1) /* Saves CR, LR, CTR, XER. */
e_stmvgprw 32(r1) /* Saves GPR0, GPR3...GPR12. */
/* Increasing the SPGR0 register.*/
mfspr r0, 272
se_addi r0, 1
mtspr 272, r0
/* Software vector address from the INTC register.*/
e_lis r3, INTC_IACKR_ADDR@h
e_or2i r3, INTC_IACKR_ADDR@l /* IACKR register address. */
se_lwz r3, 0(r3) /* IACKR register value. */
se_lwz r3, 0(r3)
mtCTR r3 /* Software handler address. */
/* Restoring pre-IRQ MSR register value.*/
mfSRR1 r0
#if !PPC_USE_IRQ_PREEMPTION
/* No preemption, keeping EE disabled.*/
se_bclri r0, 16 /* EE = bit 16. */
#endif
mtMSR r0
/* Exectes the software handler.*/
se_bctrl
#if PPC_USE_IRQ_PREEMPTION
/* Prevents preemption again.*/
wrteei 0
#endif
/* Informs the INTC that the interrupt has been served.*/
mbar 0
e_lis r3, INTC_EOIR_ADDR@h
e_or2i r3, INTC_EOIR_ADDR@l
se_stw r3, 0(r3) /* Writing any value should do. */
/* Common IVOR epilogue code, context restore.*/
.globl _ivor_exit
_ivor_exit:
/* Decreasing the SPGR0 register.*/
mfspr r0, 272
se_subi r0, 1
mtspr 272, r0
#if CH_DBG_STATISTICS
e_bl _stats_start_measure_crit_thd
#endif
#if CH_DBG_SYSTEM_STATE_CHECK
e_bl _dbg_check_lock
#endif
e_bl chSchIsPreemptionRequired
e_cmpli cr0, r3, 0
se_beq .noresch
e_bl chSchDoReschedule
.noresch:
#if CH_DBG_SYSTEM_STATE_CHECK
e_bl _dbg_check_unlock
#endif
#if CH_DBG_STATISTICS
e_bl _stats_stop_measure_crit_thd
#endif
/* Restoring the external context.*/
e_lmvgprw 32(r1) /* Restores GPR0, GPR3...GPR12. */
e_lmvsprw 16(r1) /* Restores CR, LR, CTR, XER. */
e_lmvsrrw 8(r1) /* Restores PC, MSR. */
e_addi r1, r1, 80 /* Back to the previous frame. */
se_rfi
#else /* PPC_USE_VLE == FALSE */
#error "non-VLE mode not yet implemented"
#endif /* PPC_USE_VLE == FALSE */
#endif /* !defined(__DOXYGEN__) */
/** @} */
|