MN10300: And Panasonic AM34 subarch and implement SMP
[linux-3.10.git] / arch / mn10300 / include / asm / system.h
index 9f7c7e1..8ff3e5a 100644 (file)
 #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 */