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Diffstat (limited to 'arch/mn10300/include/asm/system.h')
-rw-r--r--arch/mn10300/include/asm/system.h73
1 files changed, 22 insertions, 51 deletions
diff --git a/arch/mn10300/include/asm/system.h b/arch/mn10300/include/asm/system.h
index 9f7c7e1..8ff3e5a 100644
--- a/arch/mn10300/include/asm/system.h
+++ b/arch/mn10300/include/asm/system.h
@@ -12,12 +12,29 @@
#define _ASM_SYSTEM_H
#include <asm/cpu-regs.h>
+#include <asm/intctl-regs.h>
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <linux/kernel.h>
#include <linux/irqflags.h>
+#include <asm/atomic.h>
+
+#if !defined(CONFIG_LAZY_SAVE_FPU)
+struct fpu_state_struct;
+extern asmlinkage void fpu_save(struct fpu_state_struct *);
+#define switch_fpu(prev, next) \
+ do { \
+ if ((prev)->thread.fpu_flags & THREAD_HAS_FPU) { \
+ (prev)->thread.fpu_flags &= ~THREAD_HAS_FPU; \
+ (prev)->thread.uregs->epsw &= ~EPSW_FE; \
+ fpu_save(&(prev)->thread.fpu_state); \
+ } \
+ } while (0)
+#else
+#define switch_fpu(prev, next) do {} while (0)
+#endif
struct task_struct;
struct thread_struct;
@@ -30,6 +47,7 @@ struct task_struct *__switch_to(struct thread_struct *prev,
/* context switching is now performed out-of-line in switch_to.S */
#define switch_to(prev, next, last) \
do { \
+ switch_fpu(prev, next); \
current->thread.wchan = (u_long) __builtin_return_address(0); \
(last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
mb(); \
@@ -40,8 +58,6 @@ do { \
#define nop() asm volatile ("nop")
-#endif /* !__ASSEMBLY__ */
-
/*
* Force strict CPU ordering.
* And yes, this is required on UP too when we're talking
@@ -68,64 +84,19 @@ do { \
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
-#else
+#define set_mb(var, value) do { xchg(&var, value); } while (0)
+#else /* CONFIG_SMP */
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
-#endif
-
#define set_mb(var, value) do { var = value; mb(); } while (0)
+#endif /* CONFIG_SMP */
+
#define set_wmb(var, value) do { var = value; wmb(); } while (0)
#define read_barrier_depends() do {} while (0)
#define smp_read_barrier_depends() do {} while (0)
-/*****************************************************************************/
-/*
- * MN10300 doesn't actually have an exchange instruction
- */
-#ifndef __ASSEMBLY__
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((struct __xchg_dummy *)(x))
-
-static inline
-unsigned long __xchg(volatile unsigned long *m, unsigned long val)
-{
- unsigned long retval;
- unsigned long flags;
-
- local_irq_save(flags);
- retval = *m;
- *m = val;
- local_irq_restore(flags);
- return retval;
-}
-
-#define xchg(ptr, v) \
- ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr), \
- (unsigned long)(v)))
-
-static inline unsigned long __cmpxchg(volatile unsigned long *m,
- unsigned long old, unsigned long new)
-{
- unsigned long retval;
- unsigned long flags;
-
- local_irq_save(flags);
- retval = *m;
- if (retval == old)
- *m = new;
- local_irq_restore(flags);
- return retval;
-}
-
-#define cmpxchg(ptr, o, n) \
- ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
- (unsigned long)(o), \
- (unsigned long)(n)))
-
#endif /* !__ASSEMBLY__ */
-
#endif /* __KERNEL__ */
#endif /* _ASM_SYSTEM_H */
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