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[segment] Add "Requested memory not available" error message

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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.
This commit is contained in:
Michael Brown 2009-03-31 04:38:48 +01:00
parent edea441ad5
commit f7d2168c8e
2 changed files with 12 additions and 0 deletions
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1
src/hci/strerror.c
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@ -115,5 +115,6 @@ struct errortab common_errors[] __errortab = {
{ ENOSPC, "No space left on device" },
{ ENOTSUP, "Not supported" },
{ EPERM, "Operation not permitted" },
{ ERANGE, "Out of range" },
{ ETIMEDOUT, "Connection timed out" },
};

11
src/image/segment.c
View File

@ -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" },
};