X86_MSR_XCALL(9) | Kernel Developer's Manual (x86) | X86_MSR_XCALL(9) |
x86_msr_xcall
—
#include <x86/cpu_msr.h>
void
x86_msr_xcall
(void
*arg1, void
*arg1);
x86_msr_xcall
() function provides a x86-specific IPI
handler suitable for use with the
xcall(9) interface. It can be
used to ensure that a given MSR call is executed on all processors. The
prototype follows the xcfunc_t function pointer type and
the opaque arg1 pointer is casted to the following
structure:
struct msr_rw_info { int msr_read; int msr_type; uint64_t msr_value; uint64_t msr_mask; };
This structure must be filled prior to the call. Two fields are
compulsory: msr_type is used as the address of the MSR
and msr_value is the value to be written. If
msr_read is not zero,
x86_msr_xcall
() will first read from
msr_type and then clear the mask specified in
msr_mask before the write operation.
struct msr_rw_info msr; uint64_t xc; msr.msr_value = 0; msr.msr_read = true; msr.msr_type = MSR_THERM_CONTROL; msr.msr_mask = 0x1e; xc = xc_broadcast(0, (xcfunc_t)x86_msr_xcall, &msr, NULL); xc_wait(xc);
February 17, 2017 | NetBSD 9.0 |