linux-kernel - [PATCH v2 2/3] vTPM: reformat event log to be byte-aligned

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Date:	Wed,  7 Oct 2015 20:11:53 -0400
From:	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
To:	tpmdd-devel@...ts.sourceforge.net
Cc:	Peter Huewe <PeterHuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Vicky Lo <honclo2014@...il.com>, linux-kernel@...r.kernel.org,
	"Hon Ching(Vicky) Lo" <honclo@...ux.vnet.ibm.com>
Subject: [PATCH v2 2/3] vTPM: reformat event log to be byte-aligned

The event log generated by OpenFirmware in PowerPC is 4-byte aligned.
This patch reformats the log to be byte-aligned for the Linux client.

Signed-off-by: Hon Ching(Vicky) Lo <honclo@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/prom_init.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index b9b6bb1..8a5c248 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -1417,8 +1417,9 @@ static void __init prom_instantiate_sml(void)
 {
 	phandle ibmvtpm_node;
 	ihandle ibmvtpm_inst;
-	u32 entry = 0, size = 0;
+	u32 entry = 0, size = 0, succ = 0;
 	u64 base;
+	__be32 val;
 
 	prom_debug("prom_instantiate_sml: start...\n");
 
@@ -1433,6 +1434,16 @@ static void __init prom_instantiate_sml(void)
 		return;
 	}
 
+	if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",
+			 &val, sizeof(val)) != PROM_ERROR) {
+		if (call_prom_ret("call-method", 2, 2, &succ,
+				  ADDR("reformat-sml-to-efi-alignment"),
+				  ibmvtpm_inst) != 0 || succ == 0) {
+			prom_printf("Reformat SML to EFI alignment failed\n");
+			return;
+		}
+	}
+
 	if (call_prom_ret("call-method", 2, 2, &size,
 			  ADDR("sml-get-handover-size"),
 			  ibmvtpm_inst) != 0 || size == 0) {
-- 
1.7.1

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