diff --git a/src/acpi/acpigen.c b/src/acpi/acpigen.c
index 6f6e85a571..8d25114e13 100644
--- a/src/acpi/acpigen.c
+++ b/src/acpi/acpigen.c
@@ -2237,6 +2237,20 @@ void acpigen_resource_qword(u16 res_type, u16 gen_flags, u16 type_flags, u64 gra
 	acpigen_emit_qword(length);
 }
 
+void acpigen_resource_bus_number(u16 bus_base, u16 bus_limit)
+{
+	acpigen_resource_word(RSRC_TYPE_BUS, /* res_type */
+			      ADDR_SPACE_GENERAL_FLAG_MAX_FIXED
+			      | ADDR_SPACE_GENERAL_FLAG_MIN_FIXED
+			      | ADDR_SPACE_GENERAL_FLAG_DEC_POS, /* gen_flags */
+			      BUS_NUM_RANGE_RESOURCE_FLAG, /* type_flags */
+			      0, /* gran */
+			      bus_base, /* range_min */
+			      bus_limit, /* range_max */
+			      0x0, /* translation */
+			      bus_limit - bus_base + 1); /* length */
+}
+
 void acpigen_write_ADR(uint64_t adr)
 {
 	acpigen_write_name_qword("_ADR", adr);
diff --git a/src/include/acpi/acpigen.h b/src/include/acpi/acpigen.h
index 1b60006656..efd26e4d84 100644
--- a/src/include/acpi/acpigen.h
+++ b/src/include/acpi/acpigen.h
@@ -693,6 +693,8 @@ void acpigen_resource_dword(u16 res_type, u16 gen_flags, u16 type_flags,
 void acpigen_resource_qword(u16 res_type, u16 gen_flags, u16 type_flags,
 	u64 gran, u64 range_min, u64 range_max, u64 translation, u64 length);
 
+void acpigen_resource_bus_number(u16 bus_base, u16 bus_limit);
+
 /* Emits Notify(namestr, value) */
 void acpigen_notify(const char *namestr, int value);