bootstage: Support relocating boostage data

Some boards cannot access pre-relocation data after relocation. Reserve
space for this and copy it during preparation for relocation.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/bootstage.h b/include/bootstage.h
index 41bd617..8607e88 100644
--- a/include/bootstage.h
+++ b/include/bootstage.h
@@ -332,6 +332,13 @@ int bootstage_stash(void *base, int size);
 int bootstage_unstash(void *base, int size);
 
 /**
+ * bootstage_get_size() - Get the size of the bootstage data
+ *
+ * @return size of boostage data in bytes
+ */
+int bootstage_get_size(void);
+
+/**
  * bootstage_init() - Prepare bootstage for use
  *
  * @first: true if this is the first time bootstage is set up. This causes it
@@ -400,6 +407,11 @@ static inline int bootstage_unstash(void *base, int size)
 	return 0;	/* Pretend to succeed */
 }
 
+static inline int bootstage_get_size(void)
+{
+	return 0;
+}
+
 static inline int bootstage_init(bool first)
 {
 	return 0;