acpi: add aml_field() & aml_named_field() terms

Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/acpi/aml-build.c

@@ -216,6 +216,16 @@ build_prepend_package_length(GArray *package, unsigned length, bool incl_self)
     build_prepend_byte(package, byte);
 }
 
+static void
+build_append_pkg_length(GArray *array, unsigned length, bool incl_self)
+{
+    GArray *tmp = build_alloc_array();
+
+    build_prepend_package_length(tmp, length, incl_self);
+    build_append_array(array, tmp);
+    build_free_array(tmp);
+}
+
 void build_package(GArray *package, uint8_t op)
 {
     build_prepend_package_length(package, package->len, true);
@@ -568,3 +578,21 @@ Aml *aml_operation_region(const char *name, AmlRegionSpace rs,
     build_append_int(var->buf, len);
     return var;
 }
+
+/* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: NamedField */
+Aml *aml_named_field(const char *name, unsigned length)
+{
+    Aml *var = aml_alloc();
+    build_append_nameseg(var->buf, name);
+    build_append_pkg_length(var->buf, length, false);
+    return var;
+}
+
+/* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefField */
+Aml *aml_field(const char *name, AmlFieldFlags flags)
+{
+    Aml *var = aml_bundle(0x81 /* FieldOp */, AML_EXT_PACKAGE);
+    build_append_namestring(var->buf, "%s", name);
+    build_append_byte(var->buf, flags);
+    return var;
+}

include/hw/acpi/aml-build.h

@@ -28,6 +28,10 @@ typedef enum {
     aml_decode16 = 1,
 } AmlIODecode;
 
+typedef enum {
+    aml_byte_acc = 1,
+} AmlFieldFlags;
+
 typedef enum {
     aml_system_memory = 0x00,
     aml_system_io = 0x01,
@@ -86,6 +90,7 @@ Aml *aml_io(AmlIODecode dec, uint16_t min_base, uint16_t max_base,
             uint8_t aln, uint8_t len);
 Aml *aml_operation_region(const char *name, AmlRegionSpace rs,
                           uint32_t offset, uint32_t len);
+Aml *aml_named_field(const char *name, unsigned length);
 
 /* Block AML object primitives */
 Aml *aml_scope(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
@@ -95,6 +100,7 @@ Aml *aml_if(Aml *predicate);
 Aml *aml_package(uint8_t num_elements);
 Aml *aml_buffer(void);
 Aml *aml_resource_template(void);
+Aml *aml_field(const char *name, AmlFieldFlags flags);
 
 /* other helpers */
 GArray *build_alloc_array(void);