[SLOF] [PATCH v4 04/33] tpm: Add initial support for logging

[Stefan Berger]

This patch adds initial support for the logging that will be done
following measurements done by further code added to SLOF.

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/vtpm-sml.fs |  3 +++
 lib/libtpm/tcgbios.c        | 18 ++++++++++++++++++
 lib/libtpm/tcgbios.h        |  1 +
 lib/libtpm/tpm.code         | 11 +++++++++++
 lib/libtpm/tpm.in           |  1 +
 5 files changed, 34 insertions(+)

diff --git a/board-qemu/slof/vtpm-sml.fs b/board-qemu/slof/vtpm-sml.fs
index 7cd3729..51c3db5 100644
--- a/board-qemu/slof/vtpm-sml.fs
+++ b/board-qemu/slof/vtpm-sml.fs
@@ -25,6 +25,9 @@ LOG-SIZE BUFFER: log-base
 \ create /ibm,vtpm
 s" ibm,vtpm" 2dup device-name device-type
 
+\ convey logbase and size to the C driver
+log-base LOG-SIZE tpm-set-log-parameters
+
 : sml-get-allocated-size ( -- buffer-size)
     vtpm-debug? IF
         ." Call to sml-get-allocated-size; size = 0x" LOG-SIZE . cr
diff --git a/lib/libtpm/tcgbios.c b/lib/libtpm/tcgbios.c
index 5b12461..31d3eb0 100644
--- a/lib/libtpm/tcgbios.c
+++ b/lib/libtpm/tcgbios.c
@@ -39,6 +39,12 @@ struct tpm_state {
 	unsigned tpm_found:1;
 	unsigned tpm_working:1;
 	unsigned has_physical_presence:1;
+
+	/* base address of the log area */
+	uint8_t *log_base;
+
+	/* size of the logging area */
+	uint32_t log_area_size;
 };
 
 static struct tpm_state tpm_state;
@@ -269,3 +275,15 @@ uint32_t tpm_unassert_physical_presence(void)
 
 	return 0;
 }
+
+/****************************************************************
+ * Forth interface
+ ****************************************************************/
+
+void tpm_set_log_parameters(void *addr, unsigned int size)
+{
+	dprintf("Log is at 0x%llx; size is %u bytes\n",
+		(uint64_t)addr, size);
+	tpm_state.log_base = addr;
+	tpm_state.log_area_size = size;
+}
diff --git a/lib/libtpm/tcgbios.h b/lib/libtpm/tcgbios.h
index 5b5e481..7f7691a 100644
--- a/lib/libtpm/tcgbios.h
+++ b/lib/libtpm/tcgbios.h
@@ -18,5 +18,6 @@
 uint32_t tpm_start(void);
 void tpm_finalize(void);
 uint32_t tpm_unassert_physical_presence(void);
+void tpm_set_log_parameters(void *address, unsigned int size);
 
 #endif /* TCGBIOS_H */
diff --git a/lib/libtpm/tpm.code b/lib/libtpm/tpm.code
index 08f52e9..2f3e198 100644
--- a/lib/libtpm/tpm.code
+++ b/lib/libtpm/tpm.code
@@ -44,3 +44,14 @@ PRIM(tpm_X2d_unassert_X2d_physical_X2d_presence)
 	PUSH;
 	TOS.n = tpm_unassert_physical_presence();
 MIRP
+
+/*************************************************************/
+/* Convey log address and size                               */
+/* SLOF:   tpm-set-log-parameters  ( addr size -- )          */
+/* LIBTPM: tpm_set_log_parameters(void *addr, uint64_t size) */
+/*************************************************************/
+PRIM(tpm_X2d_set_X2d_log_X2d_parameters)
+	int size = TOS.u; POP;
+	void *addr = TOS.a; POP;
+	tpm_set_log_parameters(addr, size);
+MIRP
diff --git a/lib/libtpm/tpm.in b/lib/libtpm/tpm.in
index e212483..c6ad91c 100644
--- a/lib/libtpm/tpm.in
+++ b/lib/libtpm/tpm.in
@@ -16,3 +16,4 @@
 cod(tpm-start)
 cod(tpm-finalize)
 cod(tpm-unassert-physical-presence)
+cod(tpm-set-log-parameters)
-- 
2.17.1