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
|
/* $Id: system.h,v 1.3 2000/10/17 14:56:27 bjornw Exp $ */
#ifndef __ASM_CRIS_SYSTEM_H
#define __ASM_CRIS_SYSTEM_H
#include <asm/segment.h>
/* I need a task-specific debug struct (and the define for #ifdef
RELOC_DEBUG) to kludge into task_struct. */
#include <linux/config.h>
#include <asm/eshlibld.h>
/* the switch_to macro calls resume, an asm function in entry.S which does the actual
* task switching.
*/
extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
#define prepare_to_switch() do { } while(0)
#define switch_to(prev,next,last) last = resume(prev,next, \
(int)&((struct task_struct *)0)->thread)
/* read/write the user-mode stackpointer */
extern inline unsigned long rdusp(void) {
unsigned long usp;
__asm__ __volatile__("move usp,%0" : "=rm" (usp));
return usp;
}
#define wrusp(usp) \
__asm__ __volatile__("move %0,usp" : /* no outputs */ : "rm" (usp))
/* read the current stackpointer */
extern inline unsigned long rdsp(void) {
unsigned long sp;
__asm__ __volatile__("move.d sp,%0" : "=rm" (sp));
return sp;
}
static inline unsigned long _get_base(char * addr)
{
return 0;
}
#define nop() __asm__ __volatile__ ("nop");
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
#define tas(ptr) (xchg((ptr),1))
struct __xchg_dummy { unsigned long a[100]; };
#define __xg(x) ((struct __xchg_dummy *)(x))
#if 0
/* use these and an oscilloscope to see the fraction of time we're running with IRQ's disabled */
/* it assumes the LED's are on port 0x90000000 of course. */
#define sti() __asm__ __volatile__ ( "ei\n\tpush r0\n\tmoveq 0,r0\n\tmove.d r0,[0x90000000]\n\tpop r0" );
#define cli() __asm__ __volatile__ ( "di\n\tpush r0\n\tmove.d 0x40000,r0\n\tmove.d r0,[0x90000000]\n\tpop r0");
#define save_flags(x) __asm__ __volatile__ ("move ccr,%0" : "=rm" (x) : : "memory");
#define restore_flags(x) __asm__ __volatile__ ("move %0,ccr\n\tbtstq 5,%0\n\tbpl 1f\n\tnop\n\tpush r0\n\tmoveq 0,r0\n\tmove.d r0,[0x90000000]\n\tpop r0\n1:\n" : : "r" (x) : "memory");
#else
#define __cli() __asm__ __volatile__ ( "di");
#define __sti() __asm__ __volatile__ ( "ei" );
#define __save_flags(x) __asm__ __volatile__ ("move ccr,%0" : "=rm" (x) : : "memory");
#define __restore_flags(x) __asm__ __volatile__ ("move %0,ccr" : : "rm" (x) : "memory");
/* For spinlocks etc */
#define local_irq_save(x) __asm__ __volatile__ ("move ccr,%0\n\tdi" : "=rm" (x) : : "memory");
#define local_irq_restore(x) restore_flags(x)
#define local_irq_disable() cli()
#define local_irq_enable() sti()
#endif
#define cli() __cli()
#define sti() __sti()
#define save_flags(x) __save_flags(x)
#define restore_flags(x) __restore_flags(x)
#define save_and_cli(x) do { __save_flags(x); cli(); } while(0)
static inline unsigned long __xchg(unsigned long x, void * ptr, int size)
{
/* since Etrax doesn't have any atomic xchg instructions, we need to disable
irq's (if enabled) and do it with move.d's */
#if 0
unsigned int flags;
save_flags(flags); /* save flags, including irq enable bit */
cli(); /* shut off irq's */
switch (size) {
case 1:
__asm__ __volatile__ (
"move.b %0,r0\n\t"
"move.b %1,%0\n\t"
"move.b r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
case 2:
__asm__ __volatile__ (
"move.w %0,r0\n\t"
"move.w %1,%0\n\t"
"move.w r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
case 4:
__asm__ __volatile__ (
"move.d %0,r0\n\t"
"move.d %1,%0\n\t"
"move.d r0,%1\n\t"
: "=r" (x)
: "m" (*__xg(ptr)), "r" (x)
: "memory","r0");
break;
}
restore_flags(flags); /* restore irq enable bit */
return x;
#else
unsigned long flags,temp;
save_flags(flags); /* save flags, including irq enable bit */
cli(); /* shut off irq's */
switch (size) {
case 1:
*((unsigned char *)&temp) = x;
x = *(unsigned char *)ptr;
*(unsigned char *)ptr = *((unsigned char *)&temp);
break;
case 2:
*((unsigned short *)&temp) = x;
x = *(unsigned short *)ptr;
*(unsigned short *)ptr = *((unsigned short *)&temp);
break;
case 4:
temp = x;
x = *(unsigned long *)ptr;
*(unsigned long *)ptr = temp;
break;
}
restore_flags(flags); /* restore irq enable bit */
return x;
#endif
}
#define mb() __asm__ __volatile__ ("" : : : "memory")
#define rmb() mb()
#define wmb() mb()
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#endif
#define iret()
/*
* disable hlt during certain critical i/o operations
*/
#define HAVE_DISABLE_HLT
void disable_hlt(void);
void enable_hlt(void);
#endif
|
