audk/ArmPkg/Drivers
Heyi Guo 36c64c664b ArmPkg/CpuDxe: Disable interrupt before restoring context
Interrupt must be disabled before we storing ELR and other system
registers, or else ELR will be overridden by interrupt reentrance.

This bug is critical as we may get occasional exception or dead loop
when interrupt reentrance occurs:

  After increasing SP ... Before popping out registers
Or
  After restoring ELR

The 1st circumstance could also be resolved by optimizing SP operation
(Pop out registers before adding SP back), but the 2nd could not be
resolved by disabling interrupt.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18538 6f19259b-4bc3-4df7-8a09-765794883524
2015-09-24 17:05:39 +00:00
..
ArmCpuLib ArmPkg: remove ARMv6 support code 2015-08-19 10:51:59 +00:00
ArmGic ArmPkg/GicV3: use GICv3 generic sysreg names only for GNU as 2015-08-10 07:54:39 +00:00
CpuDxe ArmPkg/CpuDxe: Disable interrupt before restoring context 2015-09-24 17:05:39 +00:00
CpuPei ARM Packages: Removed trailing spaces 2014-08-19 13:29:52 +00:00
GenericWatchdogDxe ArmPkg/GenericWatchdogDxe: add missing VOID* cast 2015-08-10 07:54:47 +00:00
TimerDxe ArmPkg: allow HYP timer interrupt to be omitted 2015-02-28 20:24:57 +00:00