aboutsummaryrefslogtreecommitdiff
path: root/arch/blackfin/include/asm/entry.h
blob: 4104d5783e2c1a4ad80b633f123e7c1dc219c459 (plain)
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
/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef __BFIN_ENTRY_H
#define __BFIN_ENTRY_H

#include <asm/setup.h>
#include <asm/page.h>

#ifdef __ASSEMBLY__

#define	LFLUSH_I_AND_D	0x00000808
#define	LSIGTRAP	5

/*
 * NOTE!  The single-stepping code assumes that all interrupt handlers
 * start by saving SYSCFG on the stack with their first instruction.
 */

/* This one is used for exceptions, emulation, and NMI.  It doesn't push
   RETI and doesn't do cli.  */
#define SAVE_ALL_SYS		save_context_no_interrupts
/* This is used for all normal interrupts.  It saves a minimum of registers
   to the stack, loads the IRQ number, and jumps to common code.  */
#ifdef CONFIG_IPIPE
# define LOAD_IPIPE_IPEND \
	P0.l = lo(IPEND); \
	P0.h = hi(IPEND); \
	R1 = [P0];
#else
# define LOAD_IPIPE_IPEND
#endif

/*
 * Workaround for anomalies 05000283 and 05000315
 */
#if ANOMALY_05000283 || ANOMALY_05000315
# define ANOMALY_283_315_WORKAROUND(preg, dreg)		\
	cc = dreg == dreg;				\
	preg.h = HI(CHIPID);				\
	preg.l = LO(CHIPID);				\
	if cc jump 1f;					\
	dreg.l = W[preg];				\
1:
#else
# define ANOMALY_283_315_WORKAROUND(preg, dreg)
#endif /* ANOMALY_05000283 || ANOMALY_05000315 */

#ifndef CONFIG_EXACT_HWERR
/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
 * otherwise it is a waste of cycles.
 */
# ifndef CONFIG_DEBUG_KERNEL
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;
# else /* CONFIG_DEBUG_KERNEL */
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;
# endif /* CONFIG_DEBUG_KERNEL */

/* For timer interrupts, we need to save IPEND, since the user_mode
 *macro accesses it to determine where to account time.
 */
#define TIMER_INTERRUPT_ENTRY(N)					\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    jump __common_int_entry;
#else /* CONFIG_EXACT_HWERR is defined */

/* if we want hardware error to be exact, we need to do a SSYNC (which forces
 * read/writes to complete to the memory controllers), and check to see that
 * caused a pending HW error condition. If so, we assume it was caused by user
 * space, by setting the same interrupt that we are in (so it goes off again)
 * and context restore, and a RTI (without servicing anything). This should
 * cause the pending HWERR to fire, and when that is done, this interrupt will
 * be re-serviced properly.
 * As you can see by the code - we actually need to do two SSYNCS - one to
 * make sure the read/writes complete, and another to make sure the hardware
 * error is recognized by the core.
 *
 * The extra nop before the SSYNC is to make sure we work around 05000244,
 * since the 283/315 workaround includes a branch to the end
 */
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R1 = ASTAT;								\
    ANOMALY_283_315_WORKAROUND(p0, r0)					\
    P0.L = LO(ILAT);							\
    P0.H = HI(ILAT);							\
    NOP;								\
    SSYNC;								\
    SSYNC;								\
    R0 = [P0];								\
    CC = BITTST(R0, EVT_IVHW_P);					\
    IF CC JUMP 1f;							\
    ASTAT = R1;								\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;						\
1:  ASTAT = R1;								\
    RAISE N;								\
    (R7:0, P5:0) = [SP++];						\
    SP += 0x8;								\
    SYSCFG = [SP++];							\
    CSYNC;								\
    RTI;

#define TIMER_INTERRUPT_ENTRY(N)					\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R1 = ASTAT;								\
    ANOMALY_283_315_WORKAROUND(p0, r0)					\
    P0.L = LO(ILAT);							\
    P0.H = HI(ILAT);							\
    NOP;								\
    SSYNC;								\
    SSYNC;								\
    R0 = [P0];								\
    CC = BITTST(R0, EVT_IVHW_P);					\
    IF CC JUMP 1f;							\
    ASTAT = R1;								\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    jump __common_int_entry;						\
1:  ASTAT = R1;								\
    RAISE N;								\
    (R7:0, P5:0) = [SP++];						\
    SP += 0x8;								\
    SYSCFG = [SP++];							\
    CSYNC;								\
    RTI;
#endif	/* CONFIG_EXACT_HWERR */

/* This one pushes RETI without using CLI.  Interrupts are enabled.  */
#define SAVE_CONTEXT_SYSCALL	save_context_syscall
#define SAVE_CONTEXT		save_context_with_interrupts
#define SAVE_CONTEXT_CPLB	save_context_cplb

#define RESTORE_ALL_SYS		restore_context_no_interrupts
#define RESTORE_CONTEXT		restore_context_with_interrupts
#define RESTORE_CONTEXT_CPLB	restore_context_cplb

#endif				/* __ASSEMBLY__ */
#endif				/* __BFIN_ENTRY_H */