[PULL 20/57] acpi: build_tpm2: use acpi_table_begin()/acpi_table_end() instead of build_header()

["Michael S. Tsirkin" <mst@redhat.com>]

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>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210924122802.1455362-7-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/acpi/aml-build.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 4d0ff6e5f3..23cda45ee0 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -2111,13 +2111,14 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
                 const char *oem_id, const char *oem_table_id)
 {
     uint8_t start_method_params[12] = {};
-    unsigned log_addr_offset, tpm2_start;
+    unsigned log_addr_offset;
     uint64_t control_area_start_address;
     TPMIf *tpmif = tpm_find();
     uint32_t start_method;
+    AcpiTable table = { .sig = "TPM2", .rev = 4,
+                        .oem_id = oem_id, .oem_table_id = oem_table_id };
 
-    tpm2_start = table_data->len;
-    acpi_data_push(table_data, sizeof(AcpiTableHeader));
+    acpi_table_begin(&table, table_data);
 
     /* Platform Class */
     build_append_int_noprefix(table_data, TPM2_ACPI_CLASS_CLIENT, 2);
@@ -2155,9 +2156,7 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
     bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
                                    log_addr_offset, 8,
                                    ACPI_BUILD_TPMLOG_FILE, 0);
-    build_header(linker, table_data,
-                 (void *)(table_data->data + tpm2_start),
-                 "TPM2", table_data->len - tpm2_start, 4, oem_id, oem_table_id);
+    acpi_table_end(linker, &table);
 }
 #endif
 
-- 
MST