acpi: build_tpm_tcpa: use acpi_table_begin()/acpi_table_end() instead of build_header()
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.
While at it switch to build_append_int_noprefix() to build
table entries (which also removes some manual offset
calculations).
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <20210924122802.1455362-16-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 12d743d..3310a3e 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1900,31 +1900,39 @@
}
#ifdef CONFIG_TPM
+/*
+ * TCPA Description Table
+ *
+ * Following Level 00, Rev 00.37 of specs:
+ * http://www.trustedcomputinggroup.org/resources/tcg_acpi_specification
+ * 7.1.2 ACPI Table Layout
+ */
static void
build_tpm_tcpa(GArray *table_data, BIOSLinker *linker, GArray *tcpalog,
const char *oem_id, const char *oem_table_id)
{
- int tcpa_start = table_data->len;
- Acpi20Tcpa *tcpa = acpi_data_push(table_data, sizeof *tcpa);
- unsigned log_addr_size = sizeof(tcpa->log_area_start_address);
- unsigned log_addr_offset =
- (char *)&tcpa->log_area_start_address - table_data->data;
+ unsigned log_addr_offset;
+ AcpiTable table = { .sig = "TCPA", .rev = 2,
+ .oem_id = oem_id, .oem_table_id = oem_table_id };
- tcpa->platform_class = cpu_to_le16(TPM_TCPA_ACPI_CLASS_CLIENT);
- tcpa->log_area_minimum_length = cpu_to_le32(TPM_LOG_AREA_MINIMUM_SIZE);
- acpi_data_push(tcpalog, le32_to_cpu(tcpa->log_area_minimum_length));
+ acpi_table_begin(&table, table_data);
+ /* Platform Class */
+ build_append_int_noprefix(table_data, TPM_TCPA_ACPI_CLASS_CLIENT, 2);
+ /* Log Area Minimum Length (LAML) */
+ build_append_int_noprefix(table_data, TPM_LOG_AREA_MINIMUM_SIZE, 4);
+ /* Log Area Start Address (LASA) */
+ log_addr_offset = table_data->len;
+ build_append_int_noprefix(table_data, 0, 8);
+ /* allocate/reserve space for TPM log area */
+ acpi_data_push(tcpalog, TPM_LOG_AREA_MINIMUM_SIZE);
bios_linker_loader_alloc(linker, ACPI_BUILD_TPMLOG_FILE, tcpalog, 1,
false /* high memory */);
-
/* log area start address to be filled by Guest linker */
- bios_linker_loader_add_pointer(linker,
- ACPI_BUILD_TABLE_FILE, log_addr_offset, log_addr_size,
- ACPI_BUILD_TPMLOG_FILE, 0);
+ 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 + tcpa_start),
- "TCPA", sizeof(*tcpa), 2, oem_id, oem_table_id);
+ acpi_table_end(linker, &table);
}
#endif
