ieee1275/ibmvpm: Move TPM initialization functions to own file

Move common initialization functions from the ibmvtpm driver module into
tcg2.c that will be moved into the new TCG2 driver in a subsequent patch.
Make the functions available to the ibmvtpm driver as public functions
and variables.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/Makefile.core.def

@@ -1155,6 +1155,7 @@ module = {
   name = tpm;
   common = commands/tpm.c;
   ieee1275 = commands/ieee1275/ibmvtpm.c;
+  ieee1275 = lib/ieee1275/tcg2.c;
   enable = powerpc_ieee1275;
 };
 

grub-core/commands/ieee1275/ibmvtpm.c

@@ -23,46 +23,10 @@
 #include <grub/types.h>
 #include <grub/tpm.h>
 #include <grub/ieee1275/ieee1275.h>
+#include <grub/ieee1275/tpm.h>
 #include <grub/mm.h>
 #include <grub/misc.h>
 
-static grub_ieee1275_ihandle_t tpm_ihandle;
-static grub_uint8_t tpm_version;
-
-static void
-tpm_get_tpm_version (void)
-{
-  grub_ieee1275_phandle_t vtpm;
-  char buffer[20];
-
-  if (!grub_ieee1275_finddevice ("/vdevice/vtpm", &vtpm) &&
-      !grub_ieee1275_get_property (vtpm, "compatible", buffer,
-				   sizeof (buffer), NULL) &&
-      !grub_strcmp (buffer, "IBM,vtpm20"))
-    tpm_version = 2;
-}
-
-static grub_err_t
-tpm_init (void)
-{
-  static int init_success = 0;
-
-  if (!init_success)
-    {
-      if (grub_ieee1275_open ("/vdevice/vtpm", &tpm_ihandle) < 0)
-	{
-	  tpm_ihandle = GRUB_IEEE1275_IHANDLE_INVALID;
-	  return GRUB_ERR_UNKNOWN_DEVICE;
-	}
-
-      init_success = 1;
-
-      tpm_get_tpm_version ();
-    }
-
-  return GRUB_ERR_NONE;
-}
-
 static int
 ibmvtpm_2hash_ext_log (grub_uint8_t pcrindex,
 		       grub_uint32_t eventtype,
@@ -88,7 +52,7 @@ ibmvtpm_2hash_ext_log (grub_uint8_t pcrindex,
 
   INIT_IEEE1275_COMMON (&args.common, "call-method", 8, 2);
   args.method = (grub_ieee1275_cell_t) "2hash-ext-log";
-  args.ihandle = tpm_ihandle;
+  args.ihandle = grub_ieee1275_tpm_ihandle;
   args.pcrindex = pcrindex;
   args.eventtype = eventtype;
   args.description = (grub_ieee1275_cell_t) description;
@@ -136,7 +100,7 @@ grub_tpm_measure (unsigned char *buf, grub_size_t size, grub_uint8_t pcr,
   grub_dprintf ("tpm", "log_event, pcr = %d, size = 0x%" PRIxGRUB_SIZE ", %s\n",
 		pcr, size, description);
 
-  if (tpm_version == 2)
+  if (grub_ieee1275_tpm_version == 2)
     return tpm2_log_event (buf, size, pcr, description);
 
   return GRUB_ERR_NONE;
@@ -149,5 +113,5 @@ grub_tpm_present (void)
    * Call tpm_init() "late" rather than from GRUB_MOD_INIT() so that device nodes
    * can be found.
    */
-  return tpm_init() == GRUB_ERR_NONE;
+  return grub_ieee1275_tpm_init() == GRUB_ERR_NONE;
 }

grub-core/lib/ieee1275/tcg2.c

@@ -0,0 +1,61 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2024 IBM Corporation
+ *  Copyright (C) 2024 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/tpm.h>
+#include <grub/ieee1275/tpm.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+
+grub_ieee1275_ihandle_t grub_ieee1275_tpm_ihandle;
+grub_uint8_t grub_ieee1275_tpm_version;
+
+static void
+tpm_get_tpm_version (void)
+{
+  grub_ieee1275_phandle_t vtpm;
+  char buffer[20];
+
+  if (!grub_ieee1275_finddevice ("/vdevice/vtpm", &vtpm) &&
+      !grub_ieee1275_get_property (vtpm, "compatible", buffer,
+                                  sizeof (buffer), NULL) &&
+      !grub_strcmp (buffer, "IBM,vtpm20"))
+    grub_ieee1275_tpm_version = 2;
+}
+
+grub_err_t
+grub_ieee1275_tpm_init (void)
+{
+  static int init_success = 0;
+
+  if (!init_success)
+    {
+      if (grub_ieee1275_open ("/vdevice/vtpm", &grub_ieee1275_tpm_ihandle) < 0)
+	{
+	  grub_ieee1275_tpm_ihandle = GRUB_IEEE1275_IHANDLE_INVALID;
+	  return GRUB_ERR_UNKNOWN_DEVICE;
+	}
+
+      init_success = 1;
+
+      tpm_get_tpm_version ();
+    }
+
+  return GRUB_ERR_NONE;
+}

include/grub/ieee1275/tpm.h

@@ -0,0 +1,31 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2024  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_IEEE1275_TPM_HEADER
+#define GRUB_IEEE1275_TPM_HEADER      1
+
+#include <grub/err.h>
+#include <grub/types.h>
+#include <grub/ieee1275/ieee1275.h>
+
+extern grub_ieee1275_ihandle_t grub_ieee1275_tpm_ihandle;
+extern grub_uint8_t grub_ieee1275_tpm_version;
+
+extern grub_err_t grub_ieee1275_tpm_init (void);
+
+#endif