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target-arm: Add ARMCPU secure property

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Added a "has_el3" state property to the ARMCPU descriptor.  This property
indicates whether the ARMCPU has security extensions enabled (EL3) or not.
By default it is disabled at this time.

Signed-off-by: Greg Bellows <greg.bellows@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1418684992-8996-10-git-send-email-greg.bellows@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Greg Bellows 2014-12-15 17:09:46 -06:00 committed by Peter Maydell
parent 08828484a5
commit 51942aee3c
2 changed files with 25 additions and 0 deletions
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2
target-arm/cpu-qom.h
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@ -100,6 +100,8 @@ typedef struct ARMCPU {
bool start_powered_off;
/* CPU currently in PSCI powered-off state */
bool powered_off;
/* CPU has security extension */
bool has_el3;
/* PSCI conduit used to invoke PSCI methods
* 0 - disabled, 1 - smc, 2 - hvc

23
target-arm/cpu.c
View file

@ -388,6 +388,9 @@ static Property arm_cpu_reset_hivecs_property =
static Property arm_cpu_rvbar_property =
DEFINE_PROP_UINT64("rvbar", ARMCPU, rvbar, 0);
static Property arm_cpu_has_el3_property =
DEFINE_PROP_BOOL("has_el3", ARMCPU, has_el3, true);
static void arm_cpu_post_init(Object *obj)
{
ARMCPU *cpu = ARM_CPU(obj);
@ -407,6 +410,14 @@ static void arm_cpu_post_init(Object *obj)
qdev_property_add_static(DEVICE(obj), &arm_cpu_rvbar_property,
&error_abort);
}
if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
/* Add the has_el3 state CPU property only if EL3 is allowed. This will
* prevent "has_el3" from existing on CPUs which cannot support EL3.
*/
qdev_property_add_static(DEVICE(obj), &arm_cpu_has_el3_property,
&error_abort);
}
}
static void arm_cpu_finalizefn(Object *obj)
@ -476,6 +487,18 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
cpu->reset_sctlr |= (1 << 13);
}
if (!cpu->has_el3) {
/* If the has_el3 CPU property is disabled then we need to disable the
* feature.
*/
unset_feature(env, ARM_FEATURE_EL3);
/* Disable the security extension feature bits in the processor feature
* register as well. This is id_pfr1[7:4].
*/
cpu->id_pfr1 &= ~0xf0;
}
register_cp_regs_for_features(cpu);
arm_cpu_register_gdb_regs_for_features(cpu);