- Add support to atomically set/clear individual bits of a MSR register

  via cpuctl(4) driver.  Two new CPUCTL_MSRSBIT and CPUCTL_MSRCBIT ioctl(2)
  calls treat the data field of the argument struct passed as a mask
  and set/clear bits of the MSR register according to the mask value.
- Allow user to perform atomic bitwise AND and OR operaions on MSR registers
  via cpucontrol(8) utility.  Two new operations ("&=" and "|=") have been
  added.  The first one applies bitwise AND operaion between the current
  contents of the MSR register and the mask, and the second performs bitwise
  OR.  The argument can be optionally prefixed with "~" inversion operator.
  This allows one to mimic the "clear bit" behavior by using the command
  like this:
      cpucontrol -m 0x10&=~0x02		# clear the second bit of TSC MSR

  Inversion operator support in all modes (assignment, OR, AND).

Approved by:	re (kib)
MFC after:	1 month

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/sys/cpuctl.h b/sys/sys/cpuctl.h
index 57b5acf..4bddb34 100644
--- a/sys/sys/cpuctl.h
+++ b/sys/sys/cpuctl.h
@@ -48,5 +48,7 @@ typedef struct {
 #define	CPUCTL_WRMSR	_IOWR('c', 2, cpuctl_msr_args_t)
 #define	CPUCTL_CPUID	_IOWR('c', 3, cpuctl_cpuid_args_t)
 #define	CPUCTL_UPDATE	_IOWR('c', 4, cpuctl_update_args_t)
+#define	CPUCTL_MSRSBIT	_IOWR('c', 5, cpuctl_msr_args_t)
+#define	CPUCTL_MSRCBIT	_IOWR('c', 6, cpuctl_msr_args_t)
 
 #endif /* _CPUCTL_H_ */