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author | jhb <jhb@FreeBSD.org> | 2012-07-09 20:55:39 +0000 |
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committer | jhb <jhb@FreeBSD.org> | 2012-07-09 20:55:39 +0000 |
commit | 501beca671a3ea893482559b54b30ab166ad3d75 (patch) | |
tree | dc9080f4848fba24288806991434be319bb1d32a /sys/amd64/include | |
parent | fb20c6fee6baf0d773d72b8e0a63489e2e7cb188 (diff) | |
download | FreeBSD-src-501beca671a3ea893482559b54b30ab166ad3d75.zip FreeBSD-src-501beca671a3ea893482559b54b30ab166ad3d75.tar.gz |
Add a clts() wrapper around the 'clts' instruction to <machine/cpufunc.h>
on x86 and use that to implement stop_emulating() in the fpu/npx code.
Reimplement start_emulating() in the non-XEN case by using load_cr0() and
rcr0() instead of the 'lmsw' and 'smsw' instructions. Intel explicitly
discourages the use of 'lmsw' and 'smsw' on 80386 and later processors in
the description of these instructions in Volume 2 of the ADM.
Reviewed by: kib
MFC after: 1 month
Diffstat (limited to 'sys/amd64/include')
-rw-r--r-- | sys/amd64/include/cpufunc.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h index 829efc1..94d4133 100644 --- a/sys/amd64/include/cpufunc.h +++ b/sys/amd64/include/cpufunc.h @@ -107,6 +107,13 @@ clflush(u_long addr) } static __inline void +clts(void) +{ + + __asm __volatile("clts"); +} + +static __inline void disable_intr(void) { __asm __volatile("cli" : : : "memory"); @@ -702,6 +709,9 @@ intr_restore(register_t rflags) int breakpoint(void); u_int bsfl(u_int mask); u_int bsrl(u_int mask); +void clflush(u_long addr); +void clts(void); +void cpuid_count(u_int ax, u_int cx, u_int *p); void disable_intr(void); void do_cpuid(u_int ax, u_int *p); void enable_intr(void); |