From f7d2168c8eb23108e159a03416966b0f3c983320 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 31 Mar 2009 04:38:48 +0100
Subject: [segment] Add "Requested memory not available" error message

prep_segment() can sometimes fail because an image requests memory
that is already in use by gPXE.  This will happen if
e.g. undionly.kpxe is used to boot memtest86; the memtest86 image is
an old-format kernel that needs to be loaded at 9000:0000, but this
area of memory may well already be in use by the underlying PXE stack.

Add a human-friendly error message, so that the cause is more
immediately visible.
---
 src/image/segment.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/image')

diff --git a/src/image/segment.c b/src/image/segment.c
index 9bd60f9c4..3d2b8a4b3 100644
--- a/src/image/segment.c
+++ b/src/image/segment.c
@@ -26,6 +26,7 @@
 #include <errno.h>
 #include <gpxe/uaccess.h>
 #include <gpxe/memmap.h>
+#include <gpxe/errortab.h>
 #include <gpxe/segment.h>
 
 /**
@@ -72,3 +73,13 @@ int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
 	      start, mid, end );
 	return -ERANGE;
 }
+
+/**
+ * Segment-specific error messages
+ *
+ * This error happens sufficiently often to merit a user-friendly
+ * description.
+ */
+struct errortab segment_errors[] __errortab = {
+	{ ERANGE, "Requested memory not available" },
+};
-- 
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