diff options
| author | Rushikesh S Kadam <rushikesh.s.kadam@intel.com> | 2018-11-03 15:35:06 +0530 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-12-18 08:27:09 -0800 |
| commit | 4dd9607ff06416f09b5d91dc531a23c9c54d14ec (patch) | |
| tree | 8d8c7e635fb5e17840f69d16bc004a48956bb0fb | |
| parent | 59364c835d14689c55e66551cd48c668814541df (diff) | |
| download | chrome-ec-4dd9607ff06416f09b5d91dc531a23c9c54d14ec.tar.gz | |
core/minute-ia: Reset Task-switched flag during init
It is observed that CRO.TS may be set prior to main
ISH FW entry. In such case, an ESC instruction such
as fninit assembly instruction for FPU initialization,
will cause a fault.
The execution handlers are not setup this early in
FW initialization phase, and will lead to ISH CPU
reset.
This patch resets the TS flag in early FW initilization.
BRANCH=none
BUG=b:120051132
TEST=Test host FW loading for main ISH FW.
Change-Id: I7e330e2d1f39cc4a349f308ec0d046c19db281de
Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/1316702
Commit-Ready: Caveh Jalali <caveh@google.com>
Reviewed-by: Caveh Jalali <caveh@google.com>
| -rw-r--r-- | core/minute-ia/init.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/core/minute-ia/init.S b/core/minute-ia/init.S index 5ba0cbf581..67340f343c 100644 --- a/core/minute-ia/init.S +++ b/core/minute-ia/init.S @@ -348,6 +348,10 @@ reset: # Load IDT lidt __idt_ptr + # Reset Task-Switched flag to prevent an ESC instruction such + # as fninit, from triggering a Device-not-available fault + clts + #ifdef CONFIG_FPU fninit #endif |