1 #ifndef __ASM_SH64_SYSTEM_H
2 #define __ASM_SH64_SYSTEM_H
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
9 * include/asm-sh64/system.h
11 * Copyright (C) 2000, 2001 Paolo Alberelli
12 * Copyright (C) 2003 Paul Mundt
13 * Copyright (C) 2004 Richard Curnow
17 #include <linux/config.h>
18 #include <linux/kernel.h>
19 #include <asm/registers.h>
20 #include <asm/processor.h>
23 * switch_to() should switch tasks to task nr n, first
30 extern struct task_struct *sh64_switch_to(struct task_struct *prev,
31 struct thread_struct *prev_thread,
32 struct task_struct *next,
33 struct thread_struct *next_thread);
35 #define switch_to(prev,next,last) \
37 if (last_task_used_math != next) {\
38 struct pt_regs *regs = next->thread.uregs;\
39 if (regs) regs->sr |= SR_FD;\
41 last = sh64_switch_to(prev, &prev->thread, next, &next->thread);\
44 #define nop() __asm__ __volatile__ ("nop")
46 #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
48 #define tas(ptr) (xchg((ptr), 1))
50 extern void __xchg_called_with_bad_pointer(void);
52 #define mb() __asm__ __volatile__ ("synco": : :"memory")
54 #define wmb() __asm__ __volatile__ ("synco": : :"memory")
55 #define read_barrier_depends() do { } while (0)
59 #define smp_rmb() rmb()
60 #define smp_wmb() wmb()
61 #define smp_read_barrier_depends() read_barrier_depends()
63 #define smp_mb() barrier()
64 #define smp_rmb() barrier()
65 #define smp_wmb() barrier()
66 #define smp_read_barrier_depends() do { } while (0)
67 #endif /* CONFIG_SMP */
69 #define set_rmb(var, value) do { xchg(&var, value); } while (0)
70 #define set_mb(var, value) set_rmb(var, value)
71 #define set_wmb(var, value) do { var = value; wmb(); } while (0)
73 /* Interrupt Control */
75 #define SR_MASK_L 0x000000f0L
76 #define SR_MASK_LL 0x00000000000000f0LL
78 #define SR_MASK_L 0x10000000L
79 #define SR_MASK_LL 0x0000000010000000LL
82 static __inline__ void local_irq_enable(void)
84 /* cli/sti based on SR.BL */
85 unsigned long long __dummy0, __dummy1=~SR_MASK_LL;
87 __asm__ __volatile__("getcon " __SR ", %0\n\t"
89 "putcon %0, " __SR "\n\t"
94 static __inline__ void local_irq_disable(void)
96 /* cli/sti based on SR.BL */
97 unsigned long long __dummy0, __dummy1=SR_MASK_LL;
98 __asm__ __volatile__("getcon " __SR ", %0\n\t"
100 "putcon %0, " __SR "\n\t"
105 #define local_save_flags(x) \
106 (__extension__ ({ unsigned long long __dummy=SR_MASK_LL; \
107 __asm__ __volatile__( \
108 "getcon " __SR ", %0\n\t" \
113 #define local_irq_save(x) \
114 (__extension__ ({ unsigned long long __d2=SR_MASK_LL, __d1; \
115 __asm__ __volatile__( \
116 "getcon " __SR ", %1\n\t" \
117 "or %1, r63, %0\n\t" \
118 "or %1, %2, %1\n\t" \
119 "putcon %1, " __SR "\n\t" \
121 : "=&r" (x), "=&r" (__d1) \
124 #define local_irq_restore(x) do { \
125 if ( ((x) & SR_MASK_L) == 0 ) /* dropping to 0 ? */ \
126 local_irq_enable(); /* yes...re-enable */ \
129 #define irqs_disabled() \
131 unsigned long flags; \
132 local_save_flags(flags); \
136 extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val)
138 unsigned long flags, retval;
140 local_irq_save(flags);
143 local_irq_restore(flags);
147 extern __inline__ unsigned long xchg_u8(volatile unsigned char * m, unsigned long val)
149 unsigned long flags, retval;
151 local_irq_save(flags);
154 local_irq_restore(flags);
158 static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
162 return xchg_u32(ptr, x);
165 return xchg_u8(ptr, x);
168 __xchg_called_with_bad_pointer();
173 * disable hlt during certain critical i/o operations
175 #define HAVE_DISABLE_HLT
176 void disable_hlt(void);
177 void enable_hlt(void);
180 #define smp_mb() barrier()
181 #define smp_rmb() barrier()
182 #define smp_wmb() barrier()
184 #ifdef CONFIG_SH_ALPHANUMERIC
185 /* This is only used for debugging. */
186 extern void print_seg(char *file,int line);
187 #define PLS() print_seg(__FILE__,__LINE__)
188 #else /* CONFIG_SH_ALPHANUMERIC */
190 #endif /* CONFIG_SH_ALPHANUMERIC */
192 #define PL() printk("@ <%s,%s:%d>\n",__FILE__,__FUNCTION__,__LINE__)
194 #endif /* __ASM_SH64_SYSTEM_H */