tree 1628809d59852289308473302ff04414388b8737
parent 780cc95a71cb8ac3bed997ac0a32b041356cd7ab
author Dimitris Papastamos <dimitris.papastamos@arm.com> 1520866029 +0000
committer Dimitris Papastamos <dimitris.papastamos@arm.com> 1521026393 +0000

Fixup `SMCCC_ARCH_FEATURES` semantics

When querying `SMCCC_ARCH_WORKAROUND_1` through `SMCCC_ARCH_FEATURES`,
return either:
  * -1 to indicate the PE on which `SMCCC_ARCH_FEATURES` is called
    requires firmware mitigation for CVE-2017-5715 but the mitigation
    is not compiled in.
  * 0 to indicate that firmware mitigation is required, or
  * 1 to indicate that no firmware mitigation is required.

This patch complies with v1.2 of the firmware interfaces
specification (ARM DEN 0070A).

Change-Id: Ibc32d6620efdac6c340758ec502d95554a55f02a
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>