acpi: build_facs: use build_append_int_noprefix() API to compose table

Drop usage of packed structures and explicit endian
conversions when building table and use endian agnostic
build_append_int_noprefix() API to build it.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210924122802.1455362-34-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/i386/acpi-build.c

@@ -345,13 +345,23 @@ static void acpi_align_size(GArray *blob, unsigned align)
     g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align));
 }
 
-/* FACS */
+/*
+ * ACPI spec 1.0b,
+ * 5.2.6 Firmware ACPI Control Structure
+ */
 static void
 build_facs(GArray *table_data)
 {
-    AcpiFacsDescriptorRev1 *facs = acpi_data_push(table_data, sizeof *facs);
-    memcpy(&facs->signature, "FACS", 4);
-    facs->length = cpu_to_le32(sizeof(*facs));
+    const char *sig = "FACS";
+    const uint8_t reserved[40] = {};
+
+    g_array_append_vals(table_data, sig, 4); /* Signature */
+    build_append_int_noprefix(table_data, 64, 4); /* Length */
+    build_append_int_noprefix(table_data, 0, 4); /* Hardware Signature */
+    build_append_int_noprefix(table_data, 0, 4); /* Firmware Waking Vector */
+    build_append_int_noprefix(table_data, 0, 4); /* Global Lock */
+    build_append_int_noprefix(table_data, 0, 4); /* Flags */
+    g_array_append_vals(table_data, reserved, 40); /* Reserved */
 }
 
 static void build_append_pcihp_notify_entry(Aml *method, int slot)

include/hw/acpi/acpi-defs.h

@@ -117,18 +117,4 @@ typedef struct AcpiFadtData {
 #define ACPI_FADT_ARM_PSCI_COMPLIANT  (1 << 0)
 #define ACPI_FADT_ARM_PSCI_USE_HVC    (1 << 1)
 
-/*
- * ACPI 1.0 Firmware ACPI Control Structure (FACS)
- */
-struct AcpiFacsDescriptorRev1 {
-    uint32_t signature;           /* ACPI Signature */
-    uint32_t length;                 /* Length of structure, in bytes */
-    uint32_t hardware_signature;     /* Hardware configuration signature */
-    uint32_t firmware_waking_vector; /* ACPI OS waking vector */
-    uint32_t global_lock;            /* Global Lock */
-    uint32_t flags;
-    uint8_t  resverved3 [40];        /* Reserved - must be zero */
-} QEMU_PACKED;
-typedef struct AcpiFacsDescriptorRev1 AcpiFacsDescriptorRev1;
-
 #endif