Cr50: Add sysinfo vendor command

This returns the system information that is needed to determine the
correct signing keys for firmware updates.

BUG=chrome-os-partner:59747
BUG=chrome-os-partner:59705
BRANCH=none
TEST=make buildall; test on Reef

Run the "sysinfo" command on the Cr50 console:

  > sysinfo
  Reset flags: 0x00000800 (hard)
  Chip:        g cr50 B2
  RO keyid:    0x3716ee6b(dev)
  RW keyid:    0xb93d6539(dev)
  DEV_ID:      0x017950ab 0x04656742
  >

Send the raw command bytes from the Reef AP, observe the result:

  # /tmp/trunks_send --raw 80 01 00 00 00 0C 20 00 00 00 00 12
  80010000001C0000000000123716EE6BB93D6539017950AB04656742
  #

The result contains the same information from the console command:

  8001           TPM_ST_NO_SESSIONS
  0000001C       responseSize (28 bytes)
  00000000       RC_SUCCESS
  0012           vendor-specific subcommand
  3716EE6B       RO keyid
  B93D6539       RW keyid
  017950AB       DEV_ID0
  04656742       DEV_ID1

Change-Id: I82de3ebfb3e9be3b707583bc825d2efbcf851c5c
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/413106
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/board/cr50/board.c b/board/cr50/board.c
index 7ce2633e76..37f2f4dc9e 100644
--- a/board/cr50/board.c
+++ b/board/cr50/board.c
@@ -3,12 +3,15 @@
  * found in the LICENSE file.
  */
 
+#include <endian.h>
+
 #include "clock.h"
 #include "common.h"
 #include "console.h"
 #include "dcrypto/dcrypto.h"
 #include "device_state.h"
 #include "ec_version.h"
+#include "extension.h"
 #include "flash_config.h"
 #include "gpio.h"
 #include "hooks.h"
@@ -754,3 +757,43 @@ static int command_sysinfo(int argc, char **argv)
 DECLARE_SAFE_CONSOLE_COMMAND(sysinfo, command_sysinfo,
 			     NULL,
 			     "Print system info");
+
+/*
+ * SysInfo command:
+ * There are no input args.
+ * Output is this struct, all fields in network order.
+ */
+struct sysinfo_s {
+	uint32_t ro_keyid;
+	uint32_t rw_keyid;
+	uint32_t dev_id0;
+	uint32_t dev_id1;
+} __packed;
+
+static enum vendor_cmd_rc vc_sysinfo(enum vendor_cmd_cc code,
+				     void *buf,
+				     size_t input_size,
+				     size_t *response_size)
+{
+	enum system_image_copy_t active;
+	uintptr_t vaddr;
+	const struct SignedHeader *h;
+	struct sysinfo_s *sysinfo = buf;
+
+	active = system_get_ro_image_copy();
+	vaddr = get_program_memory_addr(active);
+	h = (const struct SignedHeader *)vaddr;
+	sysinfo->ro_keyid = htobe32(h->keyid);
+
+	active = system_get_image_copy();
+	vaddr = get_program_memory_addr(active);
+	h = (const struct SignedHeader *)vaddr;
+	sysinfo->rw_keyid = htobe32(h->keyid);
+
+	sysinfo->dev_id0 = htobe32(GREG32(FUSE, DEV_ID0));
+	sysinfo->dev_id1 = htobe32(GREG32(FUSE, DEV_ID1));
+
+	*response_size = sizeof(*sysinfo);
+	return VENDOR_RC_SUCCESS;
+}
+DECLARE_VENDOR_COMMAND(VENDOR_CC_SYSINFO, vc_sysinfo);