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MFamd64: Explicitly initialize the mxcsr during npxinit().

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This commit is contained in:
John Baldwin 2014-11-02 21:34:24 +00:00
parent 01d4802243
commit 8b5200e9d9
1 changed files with 9 additions and 0 deletions
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9
sys/i386/isa/npx.c
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@ -55,6 +55,7 @@ __FBSDID("$FreeBSD$");
#include <sys/syslog.h>
#endif
#include <sys/signalvar.h>
#include <vm/uma.h>
#include <machine/asmacros.h>
#include <machine/cputypes.h>
@ -99,6 +100,7 @@ __FBSDID("$FreeBSD$");
#ifdef CPU_ENABLE_SSE
#define fxrstor(addr) __asm __volatile("fxrstor %0" : : "m" (*(addr)))
#define fxsave(addr) __asm __volatile("fxsave %0" : "=m" (*(addr)))
#define ldmxcsr(csr) __asm __volatile("ldmxcsr %0" : : "m" (csr))
#define stmxcsr(addr) __asm __volatile("stmxcsr %0" : : "m" (*(addr)))
#endif
#else /* !(__GNUCLIKE_ASM && !lint) */
@ -114,6 +116,7 @@ void frstor(caddr_t addr);
#ifdef CPU_ENABLE_SSE
void fxsave(caddr_t addr);
void fxrstor(caddr_t addr);
void ldmxcsr(u_int csr);
void stmxcsr(u_int *csr);
#endif
@ -364,6 +367,12 @@ npxinit(void)
#endif
control = __INITIAL_NPXCW__;
fldcw(control);
#ifdef CPU_ENABLE_SSE
if (cpu_fxsr) {
mxcsr = __INITIAL_MXCSR__;
ldmxcsr(mxcsr);
}
#endif
start_emulating();
intr_restore(saveintr);
}