diff mbox series

[v3,10/16] platform/x86/intel/ifs: Add metadata support

Message ID 20221117035935.4136738-11-jithu.joseph@intel.com
State New
Headers
Series IFS multi test image support and misc changes |

Commit Message

Jithu Joseph Nov. 17, 2022, 3:59 a.m. UTC 
  From: Ashok Raj <ashok.raj@intel.com>

One of the existing reserved fields in microcode header has been
allocated to indicate the size for metadata structures.

The location of metadata section within microcode header is as shown
below:

    Microcode Format
   +----------------------+  Base
   |Header Version        |
   +----------------------+
   |Update revision       |
   +----------------------+
   |Date DDMMYYYY         |
   +----------------------+
   |Sig                   |
   +----------------------+
   |Checksum              |
   +----------------------+
   |Loader Version        |
   +----------------------+
   |Processor Flags       |
   +----------------------+
   |Data Size             |
   +----------------------+
   |Total Size            |
   +----------------------+
   |Meta Size             |
   +----------------------+
   |Reserved              |
   +----------------------+
   |Reserved              |
   +----------------------+  Base+48
   |                      |
   |                      |
   |                      |
   |                      |
   |    Microcode         |
   |                      |
   |     Data             |
   |                      |
   |                      |
   +----------------------+  Base+48+data_size-
   |                      |     meta_size
   |   Meta Data          |
   |   structure(s)       |
   |                      |
   +----------------------+  Base+48+data_size
   |   Extended Signature |
   |        Table         |
   |                      |
   |                      |
   |                      |
   |                      |
   |                      |
   +----------------------+  Base+total_size

Add an accessor function which will return a pointer to the
start of a specific meta_type being queried.

Upcoming changes will introduce the layout of IFS metadata
structure and will make use of metadata section.

Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
---
 drivers/platform/x86/intel/ifs/load.c | 32 +++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
diff mbox series

Patch

diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c
index c914e4d359db..713f18ce00a1 100644
--- a/drivers/platform/x86/intel/ifs/load.c
+++ b/drivers/platform/x86/intel/ifs/load.c
@@ -43,6 +43,38 @@  static const char * const scan_authentication_status[] = {
 	[2] = "Chunk authentication error. The hash of chunk did not match expected value"
 };
 
+#define MC_HEADER_META_TYPE_END		(0)
+
+struct metadata_header {
+	unsigned int		type;
+	unsigned int		blk_size;
+};
+
+static struct metadata_header *find_meta_data(void *ucode, unsigned int meta_type)
+{
+	struct metadata_header *meta_header;
+	unsigned long data_size, total_meta;
+	unsigned long meta_size = 0;
+
+	data_size = get_datasize(ucode);
+	total_meta = ((struct microcode_intel *)ucode)->hdr.metasize;
+	if (!total_meta)
+		return NULL;
+
+	meta_header = (ucode + MC_HEADER_SIZE + data_size) - total_meta;
+
+	while (meta_header->type != MC_HEADER_META_TYPE_END &&
+	       meta_header->blk_size &&
+	       meta_size < total_meta) {
+		meta_size += meta_header->blk_size;
+		if (meta_header->type == meta_type)
+			return meta_header;
+
+		meta_header = (void *)meta_header + meta_header->blk_size;
+	}
+	return NULL;
+}
+
 /*
  * To copy scan hashes and authenticate test chunks, the initiating cpu must point
  * to the EDX:EAX to the test image in linear address.