vboot: make vboot workbuf available to payload

Create a new cbtable entry called VBOOT_WORKBUF for
storing a pointer to the vboot workbuf within the
vboot_working_data structure.

BUG=b:124141368, b:124192753
TEST=Build and deploy to eve
TEST=util/lint/checkpatch.pl -g origin/master..HEAD
TEST=util/abuild/abuild -B -e -y -c 50 -p none -x
BRANCH=none

Change-Id: Id68f43c282939d9e1b419e927a14fe8baa290d91
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31887
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/security/vboot/misc.h b/src/security/vboot/misc.h
index 24e349d804..27317ad32d 100644
--- a/src/security/vboot/misc.h
+++ b/src/security/vboot/misc.h
@@ -21,9 +21,28 @@
 struct vb2_context;
 struct vb2_shared_data;
 
+struct selected_region {
+	uint32_t offset;
+	uint32_t size;
+};
+
+/*
+ * this is placed at the start of the vboot work buffer. selected_region is used
+ * for the verstage to return the location of the selected slot. buffer is used
+ * by the vboot2 core. Keep the struct CPU architecture agnostic as it crosses
+ * stage boundaries.
+ */
+struct vboot_working_data {
+	struct selected_region selected_region;
+	/* offset of the buffer from the start of this struct */
+	uint32_t buffer_offset;
+	uint32_t buffer_size;
+};
+
 /*
  * Source: security/vboot/common.c
  */
+struct vboot_working_data * const vboot_get_working_data(void);
 void vboot_init_work_context(struct vb2_context *ctx);
 void vboot_finalize_work_context(struct vb2_context *ctx);
 struct vb2_shared_data *vboot_get_shared_data(void);