1. 03 Sep, 2013 1 commit
  2. 02 Sep, 2013 1 commit
  3. 13 May, 2013 1 commit
    • Will Deacon's avatar
      arm64: debug: clear mdscr_el1 instead of taking the OS lock · 9c413e25
      Will Deacon authored
      
      
      During boot, we take the debug OS lock before interrupts are enabled.
      This is required to prevent clearing of PSTATE.D on the interrupt entry
      path, which could result in spurious debug exceptions before we've got
      round to resetting things like the hardware breakpoints registers to a
      sane state.
      
      A problem with this approach is that taking the OS lock prevents an
      external JTAG debugger from debugging the system, which is especially
      irritating during boot, where JTAG debugging can be most useful.
      
      This patch clears mdscr_el1 rather than taking the lock, clearing the
      MDE and KDE bits and preventing self-hosted hardware debug exceptions
      from occurring.
      Tested-by: default avatarMark Rutland <mark.rutland@arm.com>
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Cc: stable@vger.kernel.org
      9c413e25
  4. 24 Sep, 2012 1 commit
  5. 17 Sep, 2012 1 commit