diff options
Diffstat (limited to 'sys/arch/i386/isa/npx.c')
| -rw-r--r-- | sys/arch/i386/isa/npx.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/sys/arch/i386/isa/npx.c b/sys/arch/i386/isa/npx.c index 71c772443c1..f7a45535f91 100644 --- a/sys/arch/i386/isa/npx.c +++ b/sys/arch/i386/isa/npx.c @@ -1,4 +1,4 @@ -/* $OpenBSD: npx.c,v 1.51 2010/07/23 15:10:16 kettenis Exp $ */ +/* $OpenBSD: npx.c,v 1.52 2010/09/29 13:46:38 joshe Exp $ */ /* $NetBSD: npx.c,v 1.57 1996/05/12 23:12:24 mycroft Exp $ */ #if 0 @@ -97,6 +97,11 @@ #define clts() __asm("clts") #define stts() lcr0(rcr0() | CR0_TS) +/* + * The mxcsr_mask for this host, taken from fxsave() on the primary CPU + */ +uint32_t fpu_mxcsr_mask; + int npxintr(void *); static int npxprobe1(struct isa_attach_args *); static int x86fpflags_to_siginfo(u_int32_t); @@ -351,6 +356,16 @@ npxinit(struct cpu_info *ci) printf("%s: WARNING: Pentium FDIV bug detected!\n", ci->ci_dev.dv_xname); } + if (CPU_IS_PRIMARY(ci) && i386_use_fxsave) { + struct savexmm xm __attribute__((aligned(16))); + + bzero(&xm, sizeof(xm)); + fxsave(&xm); + if (xm.sv_env.en_mxcsr_mask) + fpu_mxcsr_mask = xm.sv_env.en_mxcsr_mask; + else + fpu_mxcsr_mask = __INITIAL_MXCSR_MASK__; + } lcr0(rcr0() | (CR0_TS)); } |