svn commit: r273989 - head/sys/i386/isa

[John Baldwin]

Author: jhb
Date: Sun Nov  2 21:34:24 2014
New Revision: 273989
URL: https://svnweb.freebsd.org/changeset/base/273989

Log:
  MFamd64: Explicitly initialize the mxcsr during npxinit().

Modified:
  head/sys/i386/isa/npx.c

Modified: head/sys/i386/isa/npx.c
==============================================================================
--- head/sys/i386/isa/npx.c     Sun Nov  2 20:57:19 2014        (r273988)
+++ head/sys/i386/isa/npx.c     Sun Nov  2 21:34:24 2014        (r273989)
@@ -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);
 }
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