From: York Sun york.sun@nxp.com
In case SError happens at EL2, if SCR_EL3[EA] is not routing it to EL3, and SCR_EL3[RW] is set to aarch64, setting HCR_EL2[AMO] routes the exception to EL2. Otherwise this exception is not taken.
Signed-off-by: York Sun york.sun@nxp.com --- Change in v3: None Change in v2: None
arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S index ef3987ea84..11b5fb2ec3 100644 --- a/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S +++ b/arch/arm/cpu/armv8/fsl-layerscape/lowlevel.S @@ -71,6 +71,15 @@ ENDPROC(smp_kick_all_cpus) ENTRY(lowlevel_init) mov x29, lr /* Save LR */
+ /* unmask SError and abort */ + msr daifclr, #4 + + /* Set HCR_EL2[AMO] so SError @EL2 is taken */ + mrs x0, hcr_el2 + orr x0, x0, #0x20 /* AMO */ + msr hcr_el2, x0 + isb + switch_el x1, 1f, 100f, 100f /* skip if not in EL3 */ 1: