[SLOF] [PATCH v2 16/20] Add TPM firmware API call get-state

[Stefan Berger]

From: Stefan Berger <stefanb at linux.vnet.ibm.com>

This patch adds support for the TPM firmware API call get-state.

Signed-off-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
Reviewed-by: Nikunj A Dadhania <nikunj at linux.vnet.ibm.com>
---
 board-qemu/slof/vio-vtpm-cdriver.fs |  8 ++++++++
 board-qemu/slof/vtpm-sml.fs         |  7 +++++++
 lib/libtpm/tcgbios.c                | 12 ++++++++++++
 lib/libtpm/tcgbios.h                |  1 +
 lib/libtpm/tpm.code                 | 10 ++++++++++
 lib/libtpm/tpm.in                   |  1 +
 slof/fs/tpm/tpm-static.fs           | 12 ++++++++++++
 7 files changed, 51 insertions(+)

diff --git a/board-qemu/slof/vio-vtpm-cdriver.fs b/board-qemu/slof/vio-vtpm-cdriver.fs
index aaaac24..64e0e1a 100644
--- a/board-qemu/slof/vio-vtpm-cdriver.fs
+++ b/board-qemu/slof/vio-vtpm-cdriver.fs
@@ -98,6 +98,14 @@ false VALUE vtpm-debug?
 ;
 
 \ firmware API call
+: get-state ( -- state )
+    " get-state" vtpm-call-forward IF
+        \ vtpm-call-forward failed; return a value
+        0 \ invalid
+    THEN
+;
+
+\ firmware API call
 : hash-all ( data-ptr data-len hash-ptr -- )
     " hash-all" vtpm-call-forward IF
         \ vtpm-call-forward failed; clean up stack
diff --git a/board-qemu/slof/vtpm-sml.fs b/board-qemu/slof/vtpm-sml.fs
index fcbd259..5e19dd6 100644
--- a/board-qemu/slof/vtpm-sml.fs
+++ b/board-qemu/slof/vtpm-sml.fs
@@ -52,6 +52,13 @@ log-base LOG-SIZE tpm-set-log-parameters
     move
 ;
 
+: get-state ( -- state )
+    vtpm-debug? IF
+        ." Call to get-state" cr
+    THEN
+    vtpm-driver-get-state
+;
+
 : hash-all ( data-ptr data-len hash-ptr -- )
     vtpm-debug? IF
         ." Call to hash-all" cr
diff --git a/lib/libtpm/tcgbios.c b/lib/libtpm/tcgbios.c
index 05b3ccb..b83a78d 100644
--- a/lib/libtpm/tcgbios.c
+++ b/lib/libtpm/tcgbios.c
@@ -1582,3 +1582,15 @@ err_exit:
 
 	return 0;
 }
+
+uint32_t tpm_driver_get_state(void)
+{
+	struct tpm_driver *td = tpm_state.tpm_drv;
+
+	/* do not check for a working TPM here */
+
+	if (!td)
+		return VTPM_DRV_STATE_INVALID;
+
+	return td->getstate();
+}
diff --git a/lib/libtpm/tcgbios.h b/lib/libtpm/tcgbios.h
index a91c6a3..2914e8f 100644
--- a/lib/libtpm/tcgbios.h
+++ b/lib/libtpm/tcgbios.h
@@ -43,6 +43,7 @@ bool tpm_log_event(struct pcpes *pcpes);
 uint32_t tpm_hash_all(const void *data, uint32_t datalen, void *hashptr);
 uint32_t tpm_get_maximum_cmd_size(void);
 uint32_t tpm_pass_through_to_tpm(unsigned char *buf, uint32_t cmdlen);
+uint32_t tpm_driver_get_state(void);
 
 /* flags returned by tpm_get_state */
 #define TPM_STATE_ENABLED        1
diff --git a/lib/libtpm/tpm.code b/lib/libtpm/tpm.code
index 90015e7..4d18222 100644
--- a/lib/libtpm/tpm.code
+++ b/lib/libtpm/tpm.code
@@ -153,6 +153,16 @@ PRIM(tpm_X2d_hash_X2d_log_X2d_extend_X2d_event)
 	TOS.n = tpm_hash_log_extend_event(eventptr);
 MIRP
 
+/****************************************************/
+/* Firmware API                                     */
+/* SLOF:   tpm-driver-get-state ( -- state)         */
+/* LIBTPM: state = tpm_driver_get_state(void)       */
+/****************************************************/
+PRIM(tpm_X2d_driver_X2d_get_X2d_state)
+	PUSH;
+	TOS.n = tpm_driver_get_state();
+MIRP
+
 /*****************************************************************/
 /* Firmware API                                                  */
 /* SLOF:   tpm-hash-all ( data-ptr data-len hash-ptr -- errcode) */
diff --git a/lib/libtpm/tpm.in b/lib/libtpm/tpm.in
index 93579ed..81eeab7 100644
--- a/lib/libtpm/tpm.in
+++ b/lib/libtpm/tpm.in
@@ -29,3 +29,4 @@ cod(tpm-hash-log-extend-event)
 cod(tpm-hash-all)
 cod(tpm-get-maximum-cmd-size)
 cod(tpm-pass-through-to-tpm)
+cod(tpm-driver-get-state)
diff --git a/slof/fs/tpm/tpm-static.fs b/slof/fs/tpm/tpm-static.fs
index b24d55d..dce6393 100644
--- a/slof/fs/tpm/tpm-static.fs
+++ b/slof/fs/tpm/tpm-static.fs
@@ -73,6 +73,18 @@ false VALUE vtpm-debug?
 ;
 
 \ firmware API function
+: vtpm-driver-get-state ( -- state )
+    vtpm-available? IF
+        tpm-driver-get-state
+        vtpm-debug? IF
+            ." VTPM: Return value from tpm-driver-get-state: " dup . cr
+        THEN
+    ELSE
+        0 \ invalid
+    THEN
+;
+
+\ firmware API function
 : vtpm-log-event ( event-ptr -- ok? )
     vtpm-available? IF
         tpm-log-event
-- 
2.4.3