[PATCH] remove set_wmb - arch removal
[linux-2.6.git] / include / asm-sh64 / system.h
1 #ifndef __ASM_SH64_SYSTEM_H
2 #define __ASM_SH64_SYSTEM_H
3
4 /*
5  * This file is subject to the terms and conditions of the GNU General Public
6  * License.  See the file "COPYING" in the main directory of this archive
7  * for more details.
8  *
9  * include/asm-sh64/system.h
10  *
11  * Copyright (C) 2000, 2001  Paolo Alberelli
12  * Copyright (C) 2003  Paul Mundt
13  * Copyright (C) 2004  Richard Curnow
14  *
15  */
16
17 #include <asm/registers.h>
18 #include <asm/processor.h>
19
20 /*
21  *      switch_to() should switch tasks to task nr n, first
22  */
23
24 typedef struct {
25         unsigned long seg;
26 } mm_segment_t;
27
28 extern struct task_struct *sh64_switch_to(struct task_struct *prev,
29                                           struct thread_struct *prev_thread,
30                                           struct task_struct *next,
31                                           struct thread_struct *next_thread);
32
33 #define switch_to(prev,next,last) \
34         do {\
35                 if (last_task_used_math != next) {\
36                         struct pt_regs *regs = next->thread.uregs;\
37                         if (regs) regs->sr |= SR_FD;\
38                 }\
39                 last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
40         } while(0)
41
42 #define nop() __asm__ __volatile__ ("nop")
43
44 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
45
46 #define tas(ptr) (xchg((ptr), 1))
47
48 extern void __xchg_called_with_bad_pointer(void);
49
50 #define mb()    __asm__ __volatile__ ("synco": : :"memory")
51 #define rmb()   mb()
52 #define wmb()   __asm__ __volatile__ ("synco": : :"memory")
53 #define read_barrier_depends()  do { } while (0)
54
55 #ifdef CONFIG_SMP
56 #define smp_mb()        mb()
57 #define smp_rmb()       rmb()
58 #define smp_wmb()       wmb()
59 #define smp_read_barrier_depends()      read_barrier_depends()
60 #else
61 #define smp_mb()        barrier()
62 #define smp_rmb()       barrier()
63 #define smp_wmb()       barrier()
64 #define smp_read_barrier_depends()      do { } while (0)
65 #endif /* CONFIG_SMP */
66
67 #define set_rmb(var, value) do { xchg(&var, value); } while (0)
68 #define set_mb(var, value) set_rmb(var, value)
69
70 /* Interrupt Control */
71 #ifndef HARD_CLI
72 #define SR_MASK_L 0x000000f0L
73 #define SR_MASK_LL 0x00000000000000f0LL
74 #else
75 #define SR_MASK_L 0x10000000L
76 #define SR_MASK_LL 0x0000000010000000LL
77 #endif
78
79 static __inline__ void local_irq_enable(void)
80 {
81         /* cli/sti based on SR.BL */
82         unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
83
84         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
85                              "and       %0, %1, %0\n\t"
86                              "putcon    %0, " __SR "\n\t"
87                              : "=&r" (__dummy0)
88                              : "r" (__dummy1));
89 }
90
91 static __inline__ void local_irq_disable(void)
92 {
93         /* cli/sti based on SR.BL */
94         unsigned long long __dummy0, __dummy1=SR_MASK_LL;
95         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
96                              "or        %0, %1, %0\n\t"
97                              "putcon    %0, " __SR "\n\t"
98                              : "=&r" (__dummy0)
99                              : "r" (__dummy1));
100 }
101
102 #define local_save_flags(x)                                             \
103 (__extension__ ({       unsigned long long __dummy=SR_MASK_LL;          \
104         __asm__ __volatile__(                                           \
105                 "getcon " __SR ", %0\n\t"                               \
106                 "and    %0, %1, %0"                                     \
107                 : "=&r" (x)                                             \
108                 : "r" (__dummy));}))
109
110 #define local_irq_save(x)                                               \
111 (__extension__ ({       unsigned long long __d2=SR_MASK_LL, __d1;       \
112         __asm__ __volatile__(                                           \
113                 "getcon " __SR ", %1\n\t"                               \
114                 "or     %1, r63, %0\n\t"                                \
115                 "or     %1, %2, %1\n\t"                                 \
116                 "putcon %1, " __SR "\n\t"                               \
117                 "and    %0, %2, %0"                                     \
118                 : "=&r" (x), "=&r" (__d1)                               \
119                 : "r" (__d2));}));
120
121 #define local_irq_restore(x) do {                                       \
122         if ( ((x) & SR_MASK_L) == 0 )           /* dropping to 0 ? */   \
123                 local_irq_enable();             /* yes...re-enable */   \
124 } while (0)
125
126 #define irqs_disabled()                 \
127 ({                                      \
128         unsigned long flags;            \
129         local_save_flags(flags);        \
130         (flags != 0);                   \
131 })
132
133 static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
134 {
135         unsigned long flags, retval;
136
137         local_irq_save(flags);
138         retval = *m;
139         *m = val;
140         local_irq_restore(flags);
141         return retval;
142 }
143
144 static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
145 {
146         unsigned long flags, retval;
147
148         local_irq_save(flags);
149         retval = *m;
150         *m = val & 0xff;
151         local_irq_restore(flags);
152         return retval;
153 }
154
155 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
156 {
157         switch (size) {
158         case 4:
159                 return xchg_u32(ptr, x);
160                 break;
161         case 1:
162                 return xchg_u8(ptr, x);
163                 break;
164         }
165         __xchg_called_with_bad_pointer();
166         return x;
167 }
168
169 /* XXX
170  * disable hlt during certain critical i/o operations
171  */
172 #define HAVE_DISABLE_HLT
173 void disable_hlt(void);
174 void enable_hlt(void);
175
176
177 #define smp_mb()        barrier()
178 #define smp_rmb()       barrier()
179 #define smp_wmb()       barrier()
180
181 #ifdef CONFIG_SH_ALPHANUMERIC
182 /* This is only used for debugging. */
183 extern void print_seg(char *file,int line);
184 #define PLS() print_seg(__FILE__,__LINE__)
185 #else   /* CONFIG_SH_ALPHANUMERIC */
186 #define PLS()
187 #endif  /* CONFIG_SH_ALPHANUMERIC */
188
189 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
190
191 #define arch_align_stack(x) (x)
192
193 #endif /* __ASM_SH64_SYSTEM_H */