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Add a few new functions/macros: intr_disable() and intr_restore() to

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disable interrupts completely, and stxa_sync(), which performs a store
immediately followed by a membar #Sync with interrupts disabled (this
is needed for writes to diagnostic registers).
This commit is contained in:
Thomas Moestl 2002-02-13 15:40:05 +00:00
parent c51aa38906
commit 9fb2b0d55e
1 changed files with 23 additions and 0 deletions
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23
sys/sparc64/include/cpufunc.h
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@ -184,6 +184,29 @@ cpu_critical_exit(critical_t pil)
wrpr(pil, pil, 0);
}
static __inline u_long
intr_disable(void)
{
u_long s;
s = rdpr(pstate);
wrpr(pstate, s & ~PSTATE_IE, 0);
return (s);
}
#define intr_restore(s) wrpr(pstate, (s), 0)
/*
* In some places, it is required that the store is directly followed by a
* membar #Sync. Don't trust the compiler to not insert instructions in
* between. We also need to disable interrupts completely.
*/
#define stxa_sync(va, asi, val) do { \
u_long s = intr_disable(); \
__asm __volatile("stxa %0, [%1] %2; membar #Sync" \
: : "r" (val), "r" (va), "n" (asi)); \
intr_restore(s); \
} while (0)
void ascopy(u_long asi, vm_offset_t src, vm_offset_t dst, size_t len);
void ascopyfrom(u_long sasi, vm_offset_t src, caddr_t dst, size_t len);
void ascopyto(caddr_t src, u_long dasi, vm_offset_t dst, size_t len);