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bsps/arm: Invalidate branch predictors earlier

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Make sure the branch predictors are invalidated before the first branch
is executed.

Update #4202.
This commit is contained in:
Sebastian Huber
2020-12-21 07:29:41 +01:00
parent 272534eb72
commit 76a1a53780
5 changed files with 11 additions and 5 deletions
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11
bsps/arm/shared/start/start.S
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@@ -181,6 +181,17 @@ _start:
mov r13, #0
#endif
#if __ARM_ARCH >= 7
/*
* Write to BPIALL (Branch Predictor Invalidate All) to invalidate all
* branch predictors. There is no need to use BPIALLIS (Branch
* Predictor Invalidate All, Inner Shareable) since this code is
* executed on all processors used by RTEMS.
*/
mov r0, #0
mcr p15, 0, r0, c7, c5, 6
#endif
#ifdef RTEMS_SMP
/* Read MPIDR and get current processor index */
mrc p15, 0, r7, c0, c0, 5