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Put "memory" to asm inline for reading privilege registers on sun4v 

to avoid issuing rdpr %ver before checking cputyp as a result of
code moving by compiler optimization.
This commit is contained in:
nakayama 2014-12-25 14:02:03 +00:00
parent 724c4ed029
commit 9a3560be91
1 changed files with 18 additions and 3 deletions
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21
sys/arch/sparc64/include/psl.h
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@ -1,4 +1,4 @@
/* $NetBSD: psl.h,v 1.55 2014/12/05 11:34:00 nakayama Exp $ */
/* $NetBSD: psl.h,v 1.56 2014/12/25 14:02:03 nakayama Exp $ */
/*
* Copyright (c) 1992, 1993
@ -284,6 +284,21 @@
#if defined(_KERNEL) && !defined(_LOCORE)
#if defined(_KERNEL_OPT)
#include "opt_sparc_arch.h"
#endif
/*
* Put "memory" to asm inline on sun4v to avoid issuing rdpr %ver
* before checking cputyp as a result of code moving by compiler
* optimization.
*/
#ifdef SUN4V
#define constasm_clobbers "memory"
#else
#define constasm_clobbers
#endif
/*
* Inlines for manipulating privileged and ancillary state registers
*/
@ -291,7 +306,7 @@
static __inline __constfunc type get##name(void) \
{ \
type _val; \
__asm(#rd " %" #reg ",%0" : "=r" (_val)); \
__asm(#rd " %" #reg ",%0" : "=r" (_val) : : constasm_clobbers); \
return _val; \
}
#define SPARC64_RD_DEF(rd, name, reg, type) \
@ -318,7 +333,7 @@ static __inline __constfunc uint64_t get##name(void) \
{ \
uint32_t _hi, _lo; \
__asm(#rd " %" #reg ",%0; srl %0,0,%1; srlx %0,32,%0" \
: "=r" (_hi), "=r" (_lo)); \
: "=r" (_hi), "=r" (_lo) : : constasm_clobbers); \
return ((uint64_t)_hi << 32) | _lo; \
}
#define SPARC64_RD64_DEF(rd, name, reg) \