[PATCH v6 06/33] acpi: add aml_method_serialized

[Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>]

It avoid explicit Mutex and will be used by NVDIMM ACPI

Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx>
---
 hw/acpi/aml-build.c         | 26 ++++++++++++++++++++++++--
 include/hw/acpi/aml-build.h |  1 +
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 9f792ab..8bee8b2 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -696,14 +696,36 @@ Aml *aml_while(Aml *predicate)
 }
 
 /* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefMethod */
-Aml *aml_method(const char *name, int arg_count)
+static Aml *__aml_method(const char *name, int arg_count, bool serialized)
 {
     Aml *var = aml_bundle(0x14 /* MethodOp */, AML_PACKAGE);
+    int methodflags;
+
+    /*
+     * MethodFlags:
+     *   bit 0-2: ArgCount (0-7)
+     *   bit 3: SerializeFlag
+     *     0: NotSerialized
+     *     1: Serialized
+     *   bit 4-7: reserved (must be 0)
+     */
+    assert(!(arg_count & ~7));
+    methodflags = arg_count | (serialized << 3);
     build_append_namestring(var->buf, "%s", name);
-    build_append_byte(var->buf, arg_count); /* MethodFlags: ArgCount */
+    build_append_byte(var->buf, methodflags);
     return var;
 }
 
+Aml *aml_method(const char *name, int arg_count)
+{
+    return __aml_method(name, arg_count, false);
+}
+
+Aml *aml_method_serialized(const char *name, int arg_count)
+{
+    return __aml_method(name, arg_count, true);
+}
+
 /* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefDevice */
 Aml *aml_device(const char *name_format, ...)
 {
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index 5b8a118..00cf40e 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -263,6 +263,7 @@ Aml *aml_qword_memory(AmlDecode dec, AmlMinFixed min_fixed,
 Aml *aml_scope(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
 Aml *aml_device(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
 Aml *aml_method(const char *name, int arg_count);
+Aml *aml_method_serialized(const char *name, int arg_count);
 Aml *aml_if(Aml *predicate);
 Aml *aml_else(void);
 Aml *aml_while(Aml *predicate);
-- 
1.8.3.1

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