acpi: add aml_equal() term

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

@@ -514,6 +514,16 @@ Aml *aml_io(AmlIODecode dec, uint16_t min_base, uint16_t max_base,
     return var;
 }
 
+/* ACPI 1.0b: 16.2.5.4 Type 2 Opcodes Encoding: DefLEqual */
+Aml *aml_equal(Aml *arg1, Aml *arg2)
+{
+    Aml *var = aml_opcode(0x93 /* LequalOp */);
+    aml_append(var, arg1);
+    aml_append(var, arg2);
+    build_append_int(var->buf, 0x00); /* NullNameOp */
+    return var;
+}
+
 /* ACPI 1.0b: 16.2.5.3 Type 1 Opcodes Encoding: DefIfElse */
 Aml *aml_if(Aml *predicate)
 {

include/hw/acpi/aml-build.h

@@ -93,6 +93,7 @@ Aml *aml_operation_region(const char *name, AmlRegionSpace rs,
 Aml *aml_named_field(const char *name, unsigned length);
 Aml *aml_local(int num);
 Aml *aml_string(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
+Aml *aml_equal(Aml *arg1, Aml *arg2);
 
 /* Block AML object primitives */
 Aml *aml_scope(const char *name_format, ...) GCC_FMT_ATTR(1, 2);