[Bug 201434] [PATCH] Bad management of PSR_A bit

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201434

            Bug ID: 201434
           Summary: [PATCH] Bad management of PSR_A bit
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: soutade at gmail.com
          Keywords: patch

Created attachment 158557
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158557&action=edit
Clear PSR_A bit at startup (initarm)

Sometimes at reboot, the PSR_A bit (CPSR register) is set. This bit mask
further hardware bad accesses until it's cleared (going into userspace for me)
leaving "Asynchronous External Abort" very late.

In the ARM_NEW_PMAP code, we call enable_interrupts() in initarm() to force
clearing this bit. Nevertheless, enable_interrupts() does a mask with
ARM_CPSR_I32 and ARM_CPSR_F32 bits making the call useless.

The attached patch correct it in ARM_NEW_PMAP and non ARM_NEW_PMAP code.

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