1 files changed, 132 insertions, 0 deletions
diff --git a/firmware/2lib/2secdata_kernel.c b/firmware/2lib/2secdata_kernel.c
new file mode 100644
index 00000000..47c7100f
--- /dev/null
+++ b/firmware/2lib/2secdata_kernel.c
@@ -0,0 +1,132 @@
+/* Copyright 2015 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.
+ *
+ * Secure storage APIs - kernel version space
+ */
+
+#include "2sysincludes.h"
+#include "2common.h"
+#include "2crc8.h"
+#include "2misc.h"
+#include "2secdata.h"
+
+vb2_error_t vb2api_secdata_kernel_check(struct vb2_context *ctx)
+{
+	struct vb2_secdata_kernel *sec =
+		(struct vb2_secdata_kernel *)ctx->secdata_kernel;
+
+	/* Verify CRC */
+	if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdata_kernel,
+						crc8))) {
+		VB2_DEBUG("secdata_kernel: bad CRC\n");
+		return VB2_ERROR_SECDATA_KERNEL_CRC;
+	}
+
+	/* Verify version */
+	if (sec->struct_version < VB2_SECDATA_KERNEL_VERSION) {
+		VB2_DEBUG("secdata_firmware: version incompatible\n");
+		return VB2_ERROR_SECDATA_KERNEL_VERSION;
+	}
+
+	/* Verify UID */
+	if (sec->uid != VB2_SECDATA_KERNEL_UID) {
+		VB2_DEBUG("secdata_kernel: bad UID\n");
+		return VB2_ERROR_SECDATA_KERNEL_UID;
+	}
+
+	return VB2_SUCCESS;
+}
+
+vb2_error_t vb2api_secdata_kernel_create(struct vb2_context *ctx)
+{
+	struct vb2_secdata_kernel *sec =
+		(struct vb2_secdata_kernel *)ctx->secdata_kernel;
+
+	/* Clear the entire struct */
+	memset(sec, 0, sizeof(*sec));
+
+	/* Set to current version */
+	sec->struct_version = VB2_SECDATA_KERNEL_VERSION;
+
+	/* Set UID */
+	sec->uid = VB2_SECDATA_KERNEL_UID;
+
+	/* Calculate initial CRC */
+	sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_kernel, crc8));
+
+	/* Mark as changed */
+	ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
+
+	return VB2_SUCCESS;
+}
+
+vb2_error_t vb2_secdata_kernel_init(struct vb2_context *ctx)
+{
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+	vb2_error_t rv;
+
+	rv = vb2api_secdata_kernel_check(ctx);
+	if (rv)
+		return rv;
+
+	/* Set status flag */
+	sd->status |= VB2_SD_STATUS_SECDATA_KERNEL_INIT;
+
+	return VB2_SUCCESS;
+}
+
+vb2_error_t vb2_secdata_kernel_get(struct vb2_context *ctx,
+				   enum vb2_secdata_kernel_param param,
+				   uint32_t *dest)
+{
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+	struct vb2_secdata_kernel *sec =
+		(struct vb2_secdata_kernel *)ctx->secdata_kernel;
+
+	if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT))
+		return VB2_ERROR_SECDATA_KERNEL_GET_UNINITIALIZED;
+
+	switch (param) {
+	case VB2_SECDATA_KERNEL_VERSIONS:
+		*dest = sec->kernel_versions;
+		return VB2_SUCCESS;
+
+	default:
+		return VB2_ERROR_SECDATA_KERNEL_GET_PARAM;
+	}
+}
+
+vb2_error_t vb2_secdata_kernel_set(struct vb2_context *ctx,
+				   enum vb2_secdata_kernel_param param,
+				   uint32_t value)
+{
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+	struct vb2_secdata_kernel *sec =
+		(struct vb2_secdata_kernel *)ctx->secdata_kernel;
+	uint32_t now;
+
+	if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT))
+		return VB2_ERROR_SECDATA_KERNEL_SET_UNINITIALIZED;
+
+	/* If not changing the value, don't regenerate the CRC. */
+	if (vb2_secdata_kernel_get(ctx, param, &now) == VB2_SUCCESS &&
+	    now == value)
+		return VB2_SUCCESS;
+
+	switch (param) {
+	case VB2_SECDATA_KERNEL_VERSIONS:
+		VB2_DEBUG("secdata_kernel versions updated from 0x%x to 0x%x\n",
+			  sec->kernel_versions, value);
+		sec->kernel_versions = value;
+		break;
+
+	default:
+		return VB2_ERROR_SECDATA_KERNEL_SET_PARAM;
+	}
+
+	/* Regenerate CRC */
+	sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_kernel, crc8));
+	ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED;
+	return VB2_SUCCESS;
+}