Author: kib
Date: Tue Jan 17 07:30:36 2012
New Revision: 230262
URL: http://svn.freebsd.org/changeset/base/230262
Log:
Implement xsetbv(), xsave() and xrstor() providing C access to the
similarly named CPU instructions.
Since our in-tree binutils gas is not aware of the instructions, and
I have to use the byte-sequence to encode them, hardcode the r/m operand
as (%rdi). This way, first argument of the pseudo-function is already
placed into proper register.
MFC after: 1 week
Modified:
head/sys/amd64/include/cpufunc.h
Modified: head/sys/amd64/include/cpufunc.h
==============================================================================
--- head/sys/amd64/include/cpufunc.h Tue Jan 17 07:23:43 2012
(r230261)
+++ head/sys/amd64/include/cpufunc.h Tue Jan 17 07:30:36 2012
(r230262)
@@ -669,6 +669,41 @@ intr_restore(register_t rflags)
write_rflags(rflags);
}
+static __inline void
+xsetbv(uint32_t reg, uint64_t val)
+{
+ uint32_t low, hi;
+
+ low = val;
+ hi = val >> 32;
+ __asm __volatile(".byte 0x0f,0x01,0xd1" : :
+ "c" (reg), "a" (low), "d" (hi));
+}
+
+static __inline void
+xsave(char *addr, uint64_t mask)
+{
+ uint32_t low, hi;
+
+ low = mask;
+ hi = mask >> 32;
+ /* xsave (%rdi) */
+ __asm __volatile(".byte 0x0f,0xae,0x27" : :
+ "a" (low), "d" (hi), "D" (addr) : "memory");
+}
+
+static __inline void
+xrstor(char *addr, uint64_t mask)
+{
+ uint32_t low, hi;
+
+ low = mask;
+ hi = mask >> 32;
+ /* xrstor (%rdi) */
+ __asm __volatile(".byte 0x0f,0xae,0x2f" : :
+ "a" (low), "d" (hi), "D" (addr));
+}
+
#else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */
int breakpoint(void);
@@ -733,6 +768,9 @@ u_int rgs(void);
void wbinvd(void);
void write_rflags(u_int rf);
void wrmsr(u_int msr, uint64_t newval);
+void xsetbv(uint32_t reg, uint64_t val);
+void xsave(char *addr, uint64_t mask);
+void xrstor(char *addr, uint64_t mask);
#endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
