src/vendorcode/google/chromeos/tpm2.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <bootstate.h>
   4 #include <console/console.h>
   5 #include <security/tpm/tss.h>
   6 #include <vb2_api.h>
   7
   8 static void disable_platform_hierarchy(void *unused)
   9 {
  10         tpm_result_t rc;
  11
  12         if (!CONFIG(TPM2))
  13                 return;
  14
  15         if (!CONFIG(RESUME_PATH_SAME_AS_BOOT))
  16                 return;
  17
  18         rc = tlcl_lib_init();
  19
  20         if (rc != TPM_SUCCESS) {
  21                 printk(BIOS_ERR, "tlcl_lib_init() failed: %#x\n", rc);
  22                 return;
  23         }
  24
  25         /* In case both families are enabled, but TPM1 is in use. */
  26         if (tlcl_get_family() != TPM_2)
  27                 return;
  28
  29         rc = tlcl2_disable_platform_hierarchy();
  30         if (rc != TPM_SUCCESS)
  31                 printk(BIOS_ERR, "Platform hierarchy disablement failed: %#x\n",
  32                         rc);
  33 }
  34
  35 BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, disable_platform_hierarchy,
  36                         NULL);