summaryrefslogtreecommitdiffstats
path: root/include/asm-sh/system.h
blob: 8b01fc4a56afb8ff0e743034e9135ff715cb4fb6 (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
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
#ifndef __ASM_SH_SYSTEM_H
#define __ASM_SH_SYSTEM_H

/*
 * Copyright (C) 1999, 2000  Niibe Yutaka  &  Kaz Kojima
 * Copyright (C) 2002 Paul Mundt
 */

#include <linux/irqflags.h>
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <asm/types.h>
#include <asm/ptrace.h>

#define AT_VECTOR_SIZE_ARCH 1 /* entries in ARCH_DLINFO */

#if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
#define __icbi()			\
{					\
	unsigned long __addr;		\
	__addr = 0xa8000000;		\
	__asm__ __volatile__(		\
		"icbi   %0\n\t"		\
		: /* no output */	\
		: "m" (__m(__addr)));	\
}
#endif

/*
 * A brief note on ctrl_barrier(), the control register write barrier.
 *
 * Legacy SH cores typically require a sequence of 8 nops after
 * modification of a control register in order for the changes to take
 * effect. On newer cores (like the sh4a and sh5) this is accomplished
 * with icbi.
 *
 * Also note that on sh4a in the icbi case we can forego a synco for the
 * write barrier, as it's not necessary for control registers.
 *
 * Historically we have only done this type of barrier for the MMUCR, but
 * it's also necessary for the CCR, so we make it generic here instead.
 */
#if defined(CONFIG_CPU_SH4A) || defined(CONFIG_CPU_SH5)
#define mb()		__asm__ __volatile__ ("synco": : :"memory")
#define rmb()		mb()
#define wmb()		__asm__ __volatile__ ("synco": : :"memory")
#define ctrl_barrier()	__icbi()
#define read_barrier_depends()	do { } while(0)
#else
#define mb()		__asm__ __volatile__ ("": : :"memory")
#define rmb()		mb()
#define wmb()		__asm__ __volatile__ ("": : :"memory")
#define ctrl_barrier()	__asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
#define read_barrier_depends()	do { } while(0)
#endif

#ifdef CONFIG_SMP
#define smp_mb()	mb()
#define smp_rmb()	rmb()
#define smp_wmb()	wmb()
#define smp_read_barrier_depends()	read_barrier_depends()
#else
#define smp_mb()	barrier()
#define smp_rmb()	barrier()
#define smp_wmb()	barrier()
#define smp_read_barrier_depends()	do { } while(0)
#endif

#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)

static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
	unsigned long flags, retval;

	local_irq_save(flags);
	retval = *m;
	*m = val;
	local_irq_restore(flags);
	return retval;
}

static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
	unsigned long flags, retval;

	local_irq_save(flags);
	retval = *m;
	*m = val & 0xff;
	local_irq_restore(flags);
	return retval;
}

extern void __xchg_called_with_bad_pointer(void);

#define __xchg(ptr, x, size)				\
({							\
	unsigned long __xchg__res;			\
	volatile void *__xchg_ptr = (ptr);		\
	switch (size) {					\
	case 4:						\
		__xchg__res = xchg_u32(__xchg_ptr, x);	\
		break;					\
	case 1:						\
		__xchg__res = xchg_u8(__xchg_ptr, x);	\
		break;					\
	default:					\
		__xchg_called_with_bad_pointer();	\
		__xchg__res = x;			\
		break;					\
	}						\
							\
	__xchg__res;					\
})

#define xchg(ptr,x)	\
	((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))

static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
	unsigned long new)
{
	__u32 retval;
	unsigned long flags;

	local_irq_save(flags);
	retval = *m;
	if (retval == old)
		*m = new;
	local_irq_restore(flags);       /* implies memory barrier  */
	return retval;
}

/* This function doesn't exist, so you'll get a linker error
 * if something tries to do an invalid cmpxchg(). */
extern void __cmpxchg_called_with_bad_pointer(void);

#define __HAVE_ARCH_CMPXCHG 1

static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
		unsigned long new, int size)
{
	switch (size) {
	case 4:
		return __cmpxchg_u32(ptr, old, new);
	}
	__cmpxchg_called_with_bad_pointer();
	return old;
}

#define cmpxchg(ptr,o,n)						 \
  ({									 \
     __typeof__(*(ptr)) _o_ = (o);					 \
     __typeof__(*(ptr)) _n_ = (n);					 \
     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
				    (unsigned long)_n_, sizeof(*(ptr))); \
  })

extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));

extern void *set_exception_table_vec(unsigned int vec, void *handler);

static inline void *set_exception_table_evt(unsigned int evt, void *handler)
{
	return set_exception_table_vec(evt >> 5, handler);
}

/*
 * SH-2A has both 16 and 32-bit opcodes, do lame encoding checks.
 */
#ifdef CONFIG_CPU_SH2A
extern unsigned int instruction_size(unsigned int insn);
#elif defined(CONFIG_SUPERH32)
#define instruction_size(insn)	(2)
#else
#define instruction_size(insn)	(4)
#endif

/* XXX
 * disable hlt during certain critical i/o operations
 */
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);

void default_idle(void);
void per_cpu_trap_init(void);

asmlinkage void break_point_trap(void);

#ifdef CONFIG_SUPERH32
#define BUILD_TRAP_HANDLER(name)					\
asmlinkage void name##_trap_handler(unsigned long r4, unsigned long r5,	\
				    unsigned long r6, unsigned long r7,	\
				    struct pt_regs __regs)

#define TRAP_HANDLER_DECL				\
	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);	\
	unsigned int vec = regs->tra;			\
	(void)vec;
#else
#define BUILD_TRAP_HANDLER(name)	\
asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
#define TRAP_HANDLER_DECL
#endif

BUILD_TRAP_HANDLER(address_error);
BUILD_TRAP_HANDLER(debug);
BUILD_TRAP_HANDLER(bug);

#define arch_align_stack(x) (x)

#ifdef CONFIG_SUPERH32
# include "system_32.h"
#else
# include "system_64.h"
#endif

#endif
OpenPOWER on IntegriCloud