[PATCH 06/16] Return value of actual log in sml-get-handover-size

[Stefan Berger]

With the functions for calculating the actual size of the log in place,
use them to determine the exact size of the log that the firmware
API call sml-get-handover-size now returns.

Signed-off-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
---
 board-qemu/slof/vtpm-sml.fs |  4 ++--
 lib/libtpm/tcgbios.c        | 15 +++++++++++++++
 lib/libtpm/tcgbios.h        |  1 +
 lib/libtpm/tpm.code         | 10 ++++++++++
 lib/libtpm/tpm.in           |  1 +
 5 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/board-qemu/slof/vtpm-sml.fs b/board-qemu/slof/vtpm-sml.fs
index 741a953..28c30f1 100644
--- a/board-qemu/slof/vtpm-sml.fs
+++ b/board-qemu/slof/vtpm-sml.fs
@@ -37,9 +37,9 @@ log-base LOG-SIZE tpm-set-log-parameters
 
 : sml-get-handover-size ( -- size )
     vtpm-debug? IF
-        ." Call to sml-get-handover-size; size = " LOG-SIZE . cr
+        ." Call to sml-get-handover-size; size = " tpm-get-logsize . cr
     THEN
-    LOG-SIZE
+    tpm-get-logsize
 ;
 
 : sml-handover ( dest size -- )
diff --git a/lib/libtpm/tcgbios.c b/lib/libtpm/tcgbios.c
index 072ed4d..e86cfc2 100644
--- a/lib/libtpm/tcgbios.c
+++ b/lib/libtpm/tcgbios.c
@@ -416,6 +416,21 @@ static void *get_log_area_address_next(void)
 	return log_area_address_next;
 }
 
+uint32_t tpm_get_logsize(void)
+{
+	uint8_t *log_area_start_address = get_log_base_ptr();
+	uint8_t *log_area_address_next = get_log_area_address_next();
+	uint32_t logsize;
+
+	if (log_area_address_next) {
+		logsize = log_area_address_next - log_area_start_address;
+		dprintf("log size: %u\n", logsize);
+		return logsize;
+	}
+
+	return 0;
+}
+
 static uint32_t tpm_sha1_calc(const uint8_t *data, uint32_t length,
 			      uint8_t *hash)
 {
diff --git a/lib/libtpm/tcgbios.h b/lib/libtpm/tcgbios.h
index 9b51826..b217dd1 100644
--- a/lib/libtpm/tcgbios.h
+++ b/lib/libtpm/tcgbios.h
@@ -18,5 +18,6 @@
 uint32_t tpm_start(void);
 uint32_t tpm_unassert_pp(void);
 void tpm_set_log_parameters(void *address, unsigned int size);
+uint32_t tpm_get_logsize(void);
 
 #endif /* TCGBIOS_H */
diff --git a/lib/libtpm/tpm.code b/lib/libtpm/tpm.code
index a6b66a8..b868ca3 100644
--- a/lib/libtpm/tpm.code
+++ b/lib/libtpm/tpm.code
@@ -46,3 +46,13 @@ PRIM(tpm_X2d_set_X2d_log_X2d_parameters)
 	void *addr = TOS.a; POP;
 	tpm_set_log_parameters(addr, size);
 MIRP
+
+/************************************************/
+/* Get the size of the log                      */
+/* SLOF:   tpm-get-logsize         ( -- size )  */
+/* LIBTPM: logsize = tpm_get_logsize(void)      */
+/************************************************/
+PRIM(tpm_X2d_get_X2d_logsize)
+	PUSH;
+	TOS.n = tpm_get_logsize();
+MIRP
diff --git a/lib/libtpm/tpm.in b/lib/libtpm/tpm.in
index a2f7cb9..32d675f 100644
--- a/lib/libtpm/tpm.in
+++ b/lib/libtpm/tpm.in
@@ -16,3 +16,4 @@
 cod(tpm-start)
 cod(tpm-unassert-pp)
 cod(tpm-set-log-parameters)
+cod(tpm-get-logsize)
-- 
1.9.3