11584 ::xcall would be useful
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>

*** 800,810 ****
   */
  #define NSEC_SHIFT 5
  
  /*ARGSUSED*/
  static int
! scalehrtime_cmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          uint32_t nsec_scale;
          hrtime_t tsc = addr, hrt, tsc_last, base, mult = 1;
          unsigned int *tscp = (unsigned int *)&tsc;
          uintptr_t scalehrtimef;
--- 800,810 ----
   */
  #define NSEC_SHIFT 5
  
  /*ARGSUSED*/
  static int
! scalehrtime_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  {
          uint32_t nsec_scale;
          hrtime_t tsc = addr, hrt, tsc_last, base, mult = 1;
          unsigned int *tscp = (unsigned int *)&tsc;
          uintptr_t scalehrtimef;
*** 902,912 ****
   * macro. We have the names for each of these features in unix's text segment
   * so we do not have to duplicate them and instead just look them up.
   */
  /*ARGSUSED*/
  static int
! x86_featureset_cmd(uintptr_t addr, uint_t flags, int argc,
      const mdb_arg_t *argv)
  {
          void *fset;
          GElf_Sym sym;
          uintptr_t nptr;
--- 902,912 ----
   * macro. We have the names for each of these features in unix's text segment
   * so we do not have to duplicate them and instead just look them up.
   */
  /*ARGSUSED*/
  static int
! x86_featureset_dcmd(uintptr_t addr, uint_t flags, int argc,
      const mdb_arg_t *argv)
  {
          void *fset;
          GElf_Sym sym;
          uintptr_t nptr;
*** 1033,1042 ****
--- 1033,1045 ----
  
          return (DCMD_OK);
  }
  #endif
  
+ extern void xcall_help(void);
+ extern int xcall_dcmd(uintptr_t, uint_t, int, const mdb_arg_t *);
+ 
  static const mdb_dcmd_t dcmds[] = {
          { "gate_desc", ":", "dump a gate descriptor", gate_desc },
          { "idt", ":[-v]", "dump an IDT", idt },
          { "ttrace", "[-x] [-t kthread]", "dump trap trace buffers", ttrace },
          { "vatopfn", ":[-a as]", "translate address to physical page",
*** 1056,1068 ****
              pfntomfn_dcmd },
          { "mfntopfn", ":", "convert hypervisor machine page to physical page",
              mfntopfn_dcmd },
          { "memseg_list", ":", "show memseg list", memseg_list },
          { "scalehrtime", ":[-a|-r]", "scale an unscaled high-res time",
!             scalehrtime_cmd, scalehrtime_help },
          { "x86_featureset", NULL, "dump the x86_featureset vector",
!                 x86_featureset_cmd },
  #ifdef _KMDB
          { "sysregs", NULL, "dump system registers", sysregs_dcmd },
  #endif
          { NULL }
  };
--- 1059,1072 ----
              pfntomfn_dcmd },
          { "mfntopfn", ":", "convert hypervisor machine page to physical page",
              mfntopfn_dcmd },
          { "memseg_list", ":", "show memseg list", memseg_list },
          { "scalehrtime", ":[-a|-r]", "scale an unscaled high-res time",
!             scalehrtime_dcmd, scalehrtime_help },
          { "x86_featureset", NULL, "dump the x86_featureset vector",
!                 x86_featureset_dcmd },
!         { "xcall", ":", "print CPU cross-call state", xcall_dcmd, xcall_help },
  #ifdef _KMDB
          { "sysregs", NULL, "dump system registers", sysregs_dcmd },
  #endif
          { NULL }
  };