aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-ppc/system.h
blob: 6a49b138c218cad837e0dd181df11dd44690054d (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
/*
 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
 */
#ifndef __PPC_SYSTEM_H
#define __PPC_SYSTEM_H

#include <linux/config.h>
#include <linux/kernel.h>

#include <asm/atomic.h>
#include <asm/hw_irq.h>

/*
 * Memory barrier.
 * The sync instruction guarantees that all memory accesses initiated
 * by this processor have been performed (with respect to all other
 * mechanisms that access memory).  The eieio instruction is a barrier
 * providing an ordering (separately) for (a) cacheable stores and (b)
 * loads and stores to non-cacheable memory (e.g. I/O devices).
 *
 * mb() prevents loads and stores being reordered across this point.
 * rmb() prevents loads being reordered across this point.
 * wmb() prevents stores being reordered across this point.
 * read_barrier_depends() prevents data-dependent loads being reordered
 *	across this point (nop on PPC).
 *
 * We can use the eieio instruction for wmb, but since it doesn't
 * give any ordering guarantees about loads, we have to use the
 * stronger but slower sync instruction for mb and rmb.
 */
#define mb()  __asm__ __volatile__ ("sync" : : : "memory")
#define rmb()  __asm__ __volatile__ ("sync" : : : "memory")
#define wmb()  __asm__ __volatile__ ("eieio" : : : "memory")
#define read_barrier_depends()  do { } while(0)

#define set_mb(var, value)	do { var = value; mb(); } while (0)
#define set_wmb(var, value)	do { var = value; wmb(); } while (0)

#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 /* CONFIG_SMP */

#ifdef __KERNEL__
struct task_struct;
struct pt_regs;

extern void print_backtrace(unsigned long *);
extern void show_regs(struct pt_regs * regs);
extern void flush_instruction_cache(void);
extern void hard_reset_now(void);
extern void poweroff_now(void);
#ifdef CONFIG_6xx
extern long _get_L2CR(void);
extern long _get_L3CR(void);
extern void _set_L2CR(unsigned long);
extern void _set_L3CR(unsigned long);
#else
#define _get_L2CR()	0L
#define _get_L3CR()	0L
#define _set_L2CR(val)	do { } while(0)
#define _set_L3CR(val)	do { } while(0)
#endif
extern void via_cuda_init(void);
extern void pmac_nvram_init(void);
extern void read_rtc_time(void);
extern void pmac_find_display(void);
extern void giveup_fpu(struct task_struct *);
extern void enable_kernel_fp(void);
extern void enable_kernel_altivec(void);
extern void giveup_altivec(struct task_struct *);
extern void load_up_altivec(struct task_struct *);
extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *);
extern int fix_alignment(struct pt_regs *);
extern void cvt_fd(float *from, double *to, unsigned long *fpscr);
extern void cvt_df(double *from, float *to, unsigned long *fpscr);
extern int call_rtas(const char *, int, int, unsigned long *, ...);
extern void cacheable_memzero(void *p, unsigned int nb);
extern void *cacheable_memcpy(void *, const void *, unsigned int);
extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
extern void bad_page_fault(struct pt_regs *, unsigned long, int);
extern int die(const char *, struct pt_regs *, long);
extern void _exception(int, struct pt_regs *, int, unsigned long);
#ifdef CONFIG_BOOKE_WDT
extern u32 booke_wdt_enabled;
extern u32 booke_wdt_period;
#endif /* CONFIG_BOOKE_WDT */

struct device_node;
extern void note_scsi_host(struct device_node *, void *);

extern struct task_struct *__switch_to(struct task_struct *,
	struct task_struct *);
#define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))

struct thread_struct;
extern struct task_struct *_switch(struct thread_struct *prev,
				   struct thread_struct *next);

extern unsigned int rtas_data;

static __inline__ unsigned long
xchg_u32(volatile void *p, unsigned long val)
{
	unsigned long prev;

	__asm__ __volatile__ ("\n\
1:	lwarx	%0,0,%2 \n"
	PPC405_ERR77(0,%2)
"	stwcx.	%3,0,%2 \n\
	bne-	1b"
	: "=&r" (prev), "=m" (*(volatile unsigned long *)p)
	: "r" (p), "r" (val), "m" (*(volatile unsigned long *)p)
	: "cc", "memory");

	return prev;
}

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

#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
#define tas(ptr) (xchg((ptr),1))

static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
{
	switch (size) {
	case 4:
		return (unsigned long) xchg_u32(ptr, x);
#if 0	/* xchg_u64 doesn't exist on 32-bit PPC */
	case 8:
		return (unsigned long) xchg_u64(ptr, x);
#endif /* 0 */
	}
	__xchg_called_with_bad_pointer();
	return x;


}

extern inline void * xchg_ptr(void * m, void * val)
{
	return (void *) xchg_u32(m, (unsigned long) val);
}


#define __HAVE_ARCH_CMPXCHG	1

static __inline__ unsigned long
__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
{
	unsigned int prev;

	__asm__ __volatile__ ("\n\
1:	lwarx	%0,0,%2 \n\
	cmpw	0,%0,%3 \n\
	bne	2f \n"
	PPC405_ERR77(0,%2)
"	stwcx.	%4,0,%2 \n\
	bne-	1b\n"
#ifdef CONFIG_SMP
"	sync\n"
#endif /* CONFIG_SMP */
"2:"
	: "=&r" (prev), "=m" (*p)
	: "r" (p), "r" (old), "r" (new), "m" (*p)
	: "cc", "memory");

	return prev;
}

/* 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);

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);
#if 0	/* we don't have __cmpxchg_u64 on 32-bit PPC */
	case 8:
		return __cmpxchg_u64(ptr, old, new);
#endif /* 0 */
	}
	__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))); \
  })

#define arch_align_stack(x) (x)

#endif /* __KERNEL__ */
#endif /* __PPC_SYSTEM_H */