vboot2: Add nvstorage and secdata functions

This is the second of several CLs adding a more memory- and
code-efficient firmware verification library.

BUG=chromium:370082
BRANCH=none
TEST=make clean && COV=1 make

Change-Id: I1dd571e7511bff18469707d5a2e90068e68e0d6f
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/199841
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/firmware/2lib/2misc.c b/firmware/2lib/2misc.c
new file mode 100644
index 00000000..760d234d
--- /dev/null
+++ b/firmware/2lib/2misc.c
@@ -0,0 +1,39 @@
+/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Misc functions which need access to vb2_context but are not public APIs
+ */
+
+#include "2sysincludes.h"
+#include "2api.h"
+#include "2common.h"
+#include "2misc.h"
+#include "2nvstorage.h"
+#include "2secdata.h"
+#include "2sha.h"
+#include "2rsa.h"
+
+int vb2_init_context(struct vb2_context *ctx)
+{
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+
+	/* Don't do anything if the context has already been initialized */
+	if (ctx->workbuf_used)
+		return VB2_SUCCESS;
+
+	/*
+	 * Workbuf had better be big enough for our shared data struct and
+	 * aligned.  Not much we can do if it isn't; we'll die before we can
+	 * store a recovery reason.
+	 */
+	if (ctx->workbuf_size < sizeof(*sd))
+		return VB2_ERROR_WORKBUF_TOO_SMALL;
+	if (!vb_aligned(ctx->workbuf, sizeof(uint32_t)))
+		return VB2_ERROR_BUFFER_UNALIGNED;
+
+	/* Initialize the shared data at the start of the work buffer */
+	memset(sd, 0, sizeof(*sd));
+	ctx->workbuf_used = sizeof(*sd);
+	return VB2_SUCCESS;
+}