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target/arm: Define an IDAU interface

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In v8M, the Implementation Defined Attribution Unit (IDAU) is
a small piece of hardware typically implemented in the SoC
which provides board or SoC specific security attribution
information for each address that the CPU performs MPU/SAU
checks on. For QEMU, we model this with a QOM interface which
is implemented by the board or SoC object and connected to
the CPU using a link property.

This commit defines the new interface class, adds the link
property to the CPU object, and makes the SAU checking
code call the IDAU interface if one is present.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-5-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-03-02 10:45:36 +00:00
parent 891f3bc37f
commit 181962fd69
4 changed files with 104 additions and 3 deletions
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15
target/arm/cpu.c
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@ -19,6 +19,7 @@
*/
#include "qemu/osdep.h"
#include "target/arm/idau.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "cpu.h"
@ -688,6 +689,13 @@ static void arm_cpu_post_init(Object *obj)
}
}
if (arm_feature(&cpu->env, ARM_FEATURE_M_SECURITY)) {
object_property_add_link(obj, "idau", TYPE_IDAU_INTERFACE, &cpu->idau,
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_UNREF_ON_RELEASE,
&error_abort);
}
qdev_property_add_static(DEVICE(obj), &arm_cpu_cfgend_property,
&error_abort);
}
@ -1821,11 +1829,18 @@ static const TypeInfo arm_cpu_type_info = {
.class_init = arm_cpu_class_init,
};
static const TypeInfo idau_interface_type_info = {
.name = TYPE_IDAU_INTERFACE,
.parent = TYPE_INTERFACE,
.class_size = sizeof(IDAUInterfaceClass),
};
static void arm_cpu_register_types(void)
{
const ARMCPUInfo *info = arm_cpus;
type_register_static(&arm_cpu_type_info);
type_register_static(&idau_interface_type_info);
while (info->name) {
cpu_register(info);