diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2017-09-12 19:13:52 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-09-21 16:29:27 +0100 |
| commit | 3b2e934463121f06d04e4d17658a9a7cdc3717b0 (patch) | |
| tree | 41c8a79405ca0503de405a2bfc79625dd939e25d /target/arm/cpu.c | |
| parent | 5255fcf8e47acd059e2f0d414841c40231c1bd22 (diff) | |
nvic: Implement AIRCR changes for v8M
The Application Interrupt and Reset Control Register has some changes
for v8M:
* new bits SYSRESETREQS, BFHFNMINS and PRIS: these all have
real state if the security extension is implemented and otherwise
are constant
* the PRIGROUP field is banked between security states
* non-secure code can be blocked from using the SYSRESET bit
to reset the system if SYSRESETREQS is set
Implement the new state and the changes to register read and write.
For the moment we ignore the effects of the secure PRIGROUP.
We will implement the effects of PRIS and BFHFNMIS later.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 1505240046-11454-6-git-send-email-peter.maydell@linaro.org
Diffstat (limited to 'target/arm/cpu.c')
| -rw-r--r-- | target/arm/cpu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 20a3445bda..33449790e5 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -187,6 +187,13 @@ static void arm_cpu_reset(CPUState *s) if (arm_feature(env, ARM_FEATURE_M_SECURITY)) { env->v7m.secure = true; + } else { + /* This bit resets to 0 if security is supported, but 1 if + * it is not. The bit is not present in v7M, but we set it + * here so we can avoid having to make checks on it conditional + * on ARM_FEATURE_V8 (we don't let the guest see the bit). + */ + env->v7m.aircr = R_V7M_AIRCR_BFHFNMINS_MASK; } /* In v7M the reset value of this bit is IMPDEF, but ARM recommends |