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| author | das <das@FreeBSD.org> | 2005-03-17 22:21:36 +0000 |
|---|---|---|
| committer | das <das@FreeBSD.org> | 2005-03-17 22:21:36 +0000 |
| commit | 148ae38eee2646f9d2d22da1a63f0b571335fc28 (patch) | |
| tree | 02d672fc466df122f7cc51b42bad867abbacc25b | |
| parent | 8435db4dc6c0ca01c1b393e6d924363df25ca227 (diff) | |
| download | FreeBSD-src-148ae38eee2646f9d2d22da1a63f0b571335fc28.zip FreeBSD-src-148ae38eee2646f9d2d22da1a63f0b571335fc28.tar.gz | |
Initialize the mxcsr properly, so the initial value in a process isn't
just the value that was left over from some other application.
| -rw-r--r-- | sys/i386/include/npx.h | 1 | ||||
| -rw-r--r-- | sys/i386/isa/npx.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/sys/i386/include/npx.h b/sys/i386/include/npx.h index 27e5dd7..484061e 100644 --- a/sys/i386/include/npx.h +++ b/sys/i386/include/npx.h @@ -134,6 +134,7 @@ union savefpu { * intermediate values are stored in memory or in FPU registers. */ #define __INITIAL_NPXCW__ 0x127F +#define __INITIAL_MXCSR__ 0x1F80 #ifdef _KERNEL int npxdna(void); diff --git a/sys/i386/isa/npx.c b/sys/i386/isa/npx.c index 50241b6..9e65106 100644 --- a/sys/i386/isa/npx.c +++ b/sys/i386/isa/npx.c @@ -108,6 +108,7 @@ __FBSDID("$FreeBSD$"); #ifdef CPU_ENABLE_SSE #define fxrstor(addr) __asm("fxrstor %0" : : "m" (*(addr))) #define fxsave(addr) __asm __volatile("fxsave %0" : "=m" (*(addr))) +#define ldmxcsr(__csr) __asm __volatile("ldmxcsr %0" : : "m" (__csr)) #endif #define start_emulating() __asm("smsw %%ax; orb %0,%%al; lmsw %%ax" \ : : "n" (CR0_TS) : "ax") @@ -754,6 +755,9 @@ npxdna() { struct pcb *pcb; register_t s; +#ifdef CPU_ENABLE_SSE + int mxcsr; +#endif u_short control; if (!npx_exists) @@ -788,6 +792,12 @@ npxdna() fninit(); control = __INITIAL_NPXCW__; fldcw(&control); +#ifdef CPU_ENABLE_SSE + if (cpu_fxsr) { + mxcsr = __INITIAL_MXCSR__; + ldmxcsr(mxcsr); + } +#endif pcb->pcb_flags |= PCB_NPXINITDONE; } else { /* |
