OS-7125 Need mitigation of L1TF (CVE-2018-3646)
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 34,44 ****
  
  /*       Copyright (c) 1987, 1988 Microsoft Corporation                 */
  /*         All Rights Reserved                                          */
  
  /*
!  * Copyright 2016 Joyent, Inc.
   */
  
  #include <sys/errno.h>
  #include <sys/asm_linkage.h>
  
--- 34,44 ----
  
  /*       Copyright (c) 1987, 1988 Microsoft Corporation                 */
  /*         All Rights Reserved                                          */
  
  /*
!  * Copyright (c) 2018 Joyent, Inc.
   */
  
  #include <sys/errno.h>
  #include <sys/asm_linkage.h>
  
*** 864,875 ****
          cmpq    $BCOPY_NHM_REP, %rdx
          .globl bcopy_patch_end
  bcopy_patch_end:
  
          .p2align 4
!         .globl bcopy_ck_size
! bcopy_ck_size:
          cmpq    $BCOPY_DFLT_REP, %rdx
          jae     L(use_rep)
  
          /*
           * Align to a 8-byte boundary. Avoids penalties from unaligned stores
--- 864,875 ----
          cmpq    $BCOPY_NHM_REP, %rdx
          .globl bcopy_patch_end
  bcopy_patch_end:
  
          .p2align 4
!         ALTENTRY(bcopy_ck_size)
! 
          cmpq    $BCOPY_DFLT_REP, %rdx
          jae     L(use_rep)
  
          /*
           * Align to a 8-byte boundary. Avoids penalties from unaligned stores
*** 954,963 ****
--- 954,964 ----
          xchgq   %rsi, %rdi              /* %rdi = src, %rsi = destination */
          andq    $7, %rdx                /* remainder */
          jnz     L(do_remainder)
          ret
  #undef  L
+         SET_SIZE(bcopy_ck_size)
  
  #ifdef DEBUG
          /*
           * Setup frame on the run-time stack. The end of the input argument
           * area must be aligned on a 16 byte boundary. The stack pointer %rsp,