From: Igor Mammedov <imammedo@redhat.com>

it replaces error-prone pointer arithmetic for build_header() API,
with 2 calls to start and finish table creation,
which hides offsets magic from API user.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210924122802.1455362-14-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 | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index f4d6ae3d02..e17451bc6d 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1405,12 +1405,12 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
 #endif
     int i;
     VMBusBridge *vmbus_bridge = vmbus_bridge_find();
+    AcpiTable table = { .sig = "DSDT", .rev = 1, .oem_id = x86ms->oem_id,
+                        .oem_table_id = x86ms->oem_table_id };
 
+    acpi_table_begin(&table, table_data);
     dsdt = init_aml_allocator();
 
-    /* Reserve space for header */
-    acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader));
-
     build_dbg_aml(dsdt);
     if (misc->is_piix4) {
         sb_scope = aml_scope("_SB");
@@ -1867,9 +1867,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
 
     /* copy AML table into ACPI tables blob and patch header there */
     g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
-    build_header(linker, table_data,
-        (void *)(table_data->data + table_data->len - dsdt->buf->len),
-                 "DSDT", dsdt->buf->len, 1, x86ms->oem_id, x86ms->oem_table_id);
+    acpi_table_end(linker, &table);
     free_aml_allocator();
 }
 
-- 
MST