[Qemu-devel] [PATCH v3 04/13] tests: acpi: fetch X_DSDT if pointer to DSDT is 0

[Igor Mammedov <imammedo@redhat.com>]

that way it would be possible to test a DSDT pointed by
64bit X_DSDT field in FADT.

PS:
it will allow to enable testing arm/virt board, which sets
only newer X_DSDT field.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v2:
  add 'val = le32_to_cpu(val)' even if it doesn't necessary
  it works as reminder that value copied from table is in
  little-endian format (Philippe Mathieu-Daudé <philmd@redhat.com>)
---
 tests/bios-tables-test.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tests/bios-tables-test.c b/tests/bios-tables-test.c
index c29dcf4..ed62a17 100644
--- a/tests/bios-tables-test.c
+++ b/tests/bios-tables-test.c
@@ -140,6 +140,8 @@ static void test_acpi_fadt_table(test_data *data)
     AcpiSdtTable table = g_array_index(data->tables, typeof(table), 0);
     uint8_t *fadt_aml = table.aml;
     uint32_t fadt_len = table.aml_len;
+    uint32_t val;
+    int dsdt_offset = 40 /* DSDT */;
 
     g_assert(compare_signature(&table, "FACP"));
 
@@ -148,8 +150,13 @@ static void test_acpi_fadt_table(test_data *data)
                      fadt_aml + 36 /* FIRMWARE_CTRL */, "FACS", false);
     g_array_append_val(data->tables, table);
 
+    memcpy(&val, fadt_aml + dsdt_offset, 4);
+    val = le32_to_cpu(val);
+    if (!val) {
+        dsdt_offset = 140 /* X_DSDT */;
+    }
     acpi_fetch_table(data->qts, &table.aml, &table.aml_len,
-                     fadt_aml + 40 /* DSDT */, "DSDT", true);
+                     fadt_aml + dsdt_offset, "DSDT", true);
     g_array_append_val(data->tables, table);
 
     memset(fadt_aml + 36, 0, 4); /* sanitize FIRMWARE_CTRL ptr */
-- 
2.7.4