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[PULL,05/41] hw/arm/armv7m: alias the NVIC "num-prio-bits" property

Message ID 20240111110505.1563291-6-peter.maydell@linaro.org
State Not Applicable
Headers show
Series [PULL,01/41] hw/arm: add cache controller for Freescale i.MX6 | expand

Commit Message

Peter Maydell Jan. 11, 2024, 11:04 a.m. UTC 
From: Samuel Tardieu <sam@rfc1149.net>

A SoC will not have a direct access to the NVIC embedded in its ARM
core. By aliasing the "num-prio-bits" property similarly to what is
done for the "num-irq" one, a SoC can easily configure it on its
armv7m instance.

Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240106181503.1746200-3-sam@rfc1149.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/arm/armv7m.h | 1 +
 hw/arm/armv7m.c         | 2 ++
 2 files changed, 3 insertions(+)
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Patch

diff --git a/include/hw/arm/armv7m.h b/include/hw/arm/armv7m.h
index e2cebbd15c0..5c057ab2ec9 100644
--- a/include/hw/arm/armv7m.h
+++ b/include/hw/arm/armv7m.h
@@ -43,6 +43,7 @@  OBJECT_DECLARE_SIMPLE_TYPE(ARMv7MState, ARMV7M)
  *   a qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET).
  * + Property "cpu-type": CPU type to instantiate
  * + Property "num-irq": number of external IRQ lines
+ * + Property "num-prio-bits": number of priority bits in the NVIC
  * + Property "memory": MemoryRegion defining the physical address space
  *   that CPU accesses see. (The NVIC, bitbanding and other CPU-internal
  *   devices will be automatically layered on top of this view.)
diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c
index e39b61bc1af..1f218277734 100644
--- a/hw/arm/armv7m.c
+++ b/hw/arm/armv7m.c
@@ -256,6 +256,8 @@  static void armv7m_instance_init(Object *obj)
     object_initialize_child(obj, "nvic", &s->nvic, TYPE_NVIC);
     object_property_add_alias(obj, "num-irq",
                               OBJECT(&s->nvic), "num-irq");
+    object_property_add_alias(obj, "num-prio-bits",
+                              OBJECT(&s->nvic), "num-prio-bits");
 
     object_initialize_child(obj, "systick-reg-ns", &s->systick[M_REG_NS],
                             TYPE_SYSTICK);