[PATCH v3 4/4] acpi: support 64bit in acpi_find_table for DSDT and FACS

[Heinrich Schuchardt]

Use X_DSDT and X_FIRMWARE_CTRL if available.

Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
 lib/acpi/acpi.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/lib/acpi/acpi.c b/lib/acpi/acpi.c
index f21e509461..f80b2176e1 100644
--- a/lib/acpi/acpi.c
+++ b/lib/acpi/acpi.c
@@ -45,11 +45,30 @@ struct acpi_table_header *acpi_find_table(const char *sig)
                if (!memcmp(hdr->signature, "FACP", ACPI_NAME_LEN)) {
                        struct acpi_fadt *fadt = (struct acpi_fadt *)hdr;
 
-                       if (!memcmp(sig, "DSDT", ACPI_NAME_LEN) && fadt->dsdt)
-                               return map_sysmem(fadt->dsdt, 0);
-                       if (!memcmp(sig, "FACS", ACPI_NAME_LEN) &&
-                           fadt->firmware_ctrl)
-                               return map_sysmem(fadt->firmware_ctrl, 0);
+                       if (!memcmp(sig, "DSDT", ACPI_NAME_LEN)) {
+                               void *dsdt;
+
+                               if (fadt->header.revision >= 3 && fadt->x_dsdt)
+                                       dsdt = map_sysmem(fadt->x_dsdt, 0);
+                               else if (fadt->dsdt)
+                                       dsdt = map_sysmem(fadt->dsdt, 0);
+                               else
+                                       dsdt = NULL;
+                               return dsdt;
+                       }
+
+                       if (!memcmp(sig, "FACS", ACPI_NAME_LEN)) {
+                               void *facs;
+
+                               if (fadt->header.revision >= 3 &&
+                                   fadt->x_firmware_ctrl)
+                                       facs = 
map_sysmem(fadt->x_firmware_ctrl, 0);
+                               else if (fadt->firmware_ctrl)
+                                       facs = map_sysmem(fadt->firmware_ctrl, 
0);
+                               else
+                                       facs = NULL;
+                               return facs;
+                       }
                }
        }
 
-- 
2.40.1