[PATCH v1 12/27] xen/riscv: introduce aia_init() and aia_available()

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

aia_init() is going to contain all the stuff related to AIA initialization.
At the moment, it is just Check if SSAIA extension is available and if yes
set is_aia_available to true.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/riscv/Makefile          |  1 +
 xen/arch/riscv/aia.c             | 25 +++++++++++++++++++++++++
 xen/arch/riscv/include/asm/aia.h | 10 ++++++++++
 xen/arch/riscv/intc.c            |  3 +++
 4 files changed, 39 insertions(+)
 create mode 100644 xen/arch/riscv/aia.c
 create mode 100644 xen/arch/riscv/include/asm/aia.h

diff --git a/xen/arch/riscv/Makefile b/xen/arch/riscv/Makefile
index fb04cc5a56b2..d772b42386c0 100644
--- a/xen/arch/riscv/Makefile
+++ b/xen/arch/riscv/Makefile
@@ -1,3 +1,4 @@
+obj-y += aia.o
 obj-y += aplic.o
 obj-y += cpufeature.o
 obj-y += dom0less-build.o
diff --git a/xen/arch/riscv/aia.c b/xen/arch/riscv/aia.c
new file mode 100644
index 000000000000..5e3f190e8e2c
--- /dev/null
+++ b/xen/arch/riscv/aia.c
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <xen/errno.h>
+#include <xen/init.h>
+#include <xen/sections.h>
+#include <xen/types.h>
+
+#include <asm/cpufeature.h>
+
+static bool __ro_after_init is_aia_available;
+
+bool aia_available(void)
+{
+    return is_aia_available;
+}
+
+int __init aia_init(void)
+{
+    if ( !riscv_isa_extension_available(NULL, RISCV_ISA_EXT_ssaia) )
+        return -ENODEV;
+
+    is_aia_available = true;
+
+    return 0;
+}
diff --git a/xen/arch/riscv/include/asm/aia.h b/xen/arch/riscv/include/asm/aia.h
new file mode 100644
index 000000000000..039607faf685
--- /dev/null
+++ b/xen/arch/riscv/include/asm/aia.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef ASM__RISCV__AIA_H
+#define ASM__RISCV__AIA_H
+
+bool aia_available(void);
+
+int aia_init(void);
+
+#endif /* ASM__RISCV__ACPI_H */
diff --git a/xen/arch/riscv/intc.c b/xen/arch/riscv/intc.c
index a6f8c30f4771..c9f12651fda1 100644
--- a/xen/arch/riscv/intc.c
+++ b/xen/arch/riscv/intc.c
@@ -8,6 +8,7 @@
 #include <xen/lib.h>
 #include <xen/spinlock.h>
 
+#include <asm/aia.h>
 #include <asm/intc.h>
 
 static const struct intc_hw_operations *__ro_after_init intc_hw_ops;
@@ -27,6 +28,8 @@ void __init intc_preinit(void)
 
 void __init intc_init(void)
 {
+    aia_init();
+
     if ( intc_hw_ops->init() )
         panic("Failed to initialize the interrupt controller drivers\n");
 }
-- 
2.53.0