On 05/03/2017 06:30 PM, Alistair Francis wrote:
On Tue, Apr 25, 2017 at 5:07 AM, Peter Maydell <[email protected]> wrote:
If the CPU is a PMSA config with no MPU implemented, then the
SCTLR.M bit should be RAZ/WI, so that the guest can never
turn on the non-existent MPU.
Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Thanks,
Alistair
---
target/arm/helper.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 404bfdb..f0f25c8 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -3258,6 +3258,11 @@ static void sctlr_write(CPUARMState *env, const
ARMCPRegInfo *ri,
return;
}
+ if (arm_feature(env, ARM_FEATURE_PMSA) && !cpu->has_mpu) {
+ /* M bit is RAZ/WI for PMSA with no MPU implemented */
+ value &= ~SCTLR_M;
+ }
+
raw_write(env, ri, value);
/* ??? Lots of these bits are not implemented. */
/* This may enable/disable the MMU, so do a TLB flush. */
--
2.7.4
