/*
.data

msg:
.ascii "v: %08x\n"

.text
.align 2

.global main
main:
  mrc p15, 0, r1, c9, c14, 0
  ldr r0,=msg
  bl printf
  bl exit
*/
.global enable
enable:
  @ user access
  mov r0, #1
  mcr p15, 0, r0, c9, c14, 0

  @ all counters
  mrc p15, 0, r0, c9, c12, 0
  orr r0, #1
  mcr p15, 0, r0, c9, c12, 0

  @ cycle counter
  mov r0, #1<<31
  mcr p15, 0, r0, c9, c12, 1

  bx lr