Don't include linux/config.h from anywhere else in include/
[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 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
70
71 /* Interrupt Control */
72 #ifndef HARD_CLI
73 #define SR_MASK_L 0x000000f0L
74 #define SR_MASK_LL 0x00000000000000f0LL
75 #else
76 #define SR_MASK_L 0x10000000L
77 #define SR_MASK_LL 0x0000000010000000LL
78 #endif
79
80 static __inline__ void local_irq_enable(void)
81 {
82         /* cli/sti based on SR.BL */
83         unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
84
85         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
86                              "and       %0, %1, %0\n\t"
87                              "putcon    %0, " __SR "\n\t"
88                              : "=&r" (__dummy0)
89                              : "r" (__dummy1));
90 }
91
92 static __inline__ void local_irq_disable(void)
93 {
94         /* cli/sti based on SR.BL */
95         unsigned long long __dummy0, __dummy1=SR_MASK_LL;
96         __asm__ __volatile__("getcon    " __SR ", %0\n\t"
97                              "or        %0, %1, %0\n\t"
98                              "putcon    %0, " __SR "\n\t"
99                              : "=&r" (__dummy0)
100                              : "r" (__dummy1));
101 }
102
103 #define local_save_flags(x)                                             \
104 (__extension__ ({       unsigned long long __dummy=SR_MASK_LL;          \
105         __asm__ __volatile__(                                           \
106                 "getcon " __SR ", %0\n\t"                               \
107                 "and    %0, %1, %0"                                     \
108                 : "=&r" (x)                                             \
109                 : "r" (__dummy));}))
110
111 #define local_irq_save(x)                                               \
112 (__extension__ ({       unsigned long long __d2=SR_MASK_LL, __d1;       \
113         __asm__ __volatile__(                                           \
114                 "getcon " __SR ", %1\n\t"                               \
115                 "or     %1, r63, %0\n\t"                                \
116                 "or     %1, %2, %1\n\t"                                 \
117                 "putcon %1, " __SR "\n\t"                               \
118                 "and    %0, %2, %0"                                     \
119                 : "=&r" (x), "=&r" (__d1)                               \
120                 : "r" (__d2));}));
121
122 #define local_irq_restore(x) do {                                       \
123         if ( ((x) & SR_MASK_L) == 0 )           /* dropping to 0 ? */   \
124                 local_irq_enable();             /* yes...re-enable */   \
125 } while (0)
126
127 #define irqs_disabled()                 \
128 ({                                      \
129         unsigned long flags;            \
130         local_save_flags(flags);        \
131         (flags != 0);                   \
132 })
133
134 static inline unsigned long xchg_u32(volatile int * m, unsigned long val)
135 {
136         unsigned long flags, retval;
137
138         local_irq_save(flags);
139         retval = *m;
140         *m = val;
141         local_irq_restore(flags);
142         return retval;
143 }
144
145 static inline unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
146 {
147         unsigned long flags, retval;
148
149         local_irq_save(flags);
150         retval = *m;
151         *m = val & 0xff;
152         local_irq_restore(flags);
153         return retval;
154 }
155
156 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
157 {
158         switch (size) {
159         case 4:
160                 return xchg_u32(ptr, x);
161                 break;
162         case 1:
163                 return xchg_u8(ptr, x);
164                 break;
165         }
166         __xchg_called_with_bad_pointer();
167         return x;
168 }
169
170 /* XXX
171  * disable hlt during certain critical i/o operations
172  */
173 #define HAVE_DISABLE_HLT
174 void disable_hlt(void);
175 void enable_hlt(void);
176
177
178 #define smp_mb()        barrier()
179 #define smp_rmb()       barrier()
180 #define smp_wmb()       barrier()
181
182 #ifdef CONFIG_SH_ALPHANUMERIC
183 /* This is only used for debugging. */
184 extern void print_seg(char *file,int line);
185 #define PLS() print_seg(__FILE__,__LINE__)
186 #else   /* CONFIG_SH_ALPHANUMERIC */
187 #define PLS()
188 #endif  /* CONFIG_SH_ALPHANUMERIC */
189
190 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
191
192 #define arch_align_stack(x) (x)
193
194 #endif /* __ASM_SH64_SYSTEM_H */