1 files changed, 91 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/image/segment.c b/qemu/roms/ipxe/src/image/segment.c
new file mode 100644
index 000000000..86fe42662
--- /dev/null
+++ b/qemu/roms/ipxe/src/image/segment.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/**
+ * @file
+ *
+ * Executable image segments
+ *
+ */
+
+#include <errno.h>
+#include <ipxe/uaccess.h>
+#include <ipxe/io.h>
+#include <ipxe/errortab.h>
+#include <ipxe/segment.h>
+
+/**
+ * Segment-specific error messages
+ *
+ * This error happens sufficiently often to merit a user-friendly
+ * description.
+ */
+#define ERANGE_SEGMENT __einfo_error ( EINFO_ERANGE_SEGMENT )
+#define EINFO_ERANGE_SEGMENT \
+	__einfo_uniqify ( EINFO_ERANGE, 0x01, "Requested memory not available" )
+struct errortab segment_errors[] __errortab = {
+	__einfo_errortab ( EINFO_ERANGE_SEGMENT ),
+};
+
+/**
+ * Prepare segment for loading
+ *
+ * @v segment		Segment start
+ * @v filesz		Size of the "allocated bytes" portion of the segment
+ * @v memsz		Size of the segment
+ * @ret rc		Return status code
+ */
+int prep_segment ( userptr_t segment, size_t filesz, size_t memsz ) {
+	struct memory_map memmap;
+	physaddr_t start = user_to_phys ( segment, 0 );
+	physaddr_t mid = user_to_phys ( segment, filesz );
+	physaddr_t end = user_to_phys ( segment, memsz );
+	unsigned int i;
+
+	DBG ( "Preparing segment [%lx,%lx,%lx)\n", start, mid, end );
+
+	/* Sanity check */
+	if ( filesz > memsz ) {
+		DBG ( "Insane segment [%lx,%lx,%lx)\n", start, mid, end );
+		return -EINVAL;
+	}
+
+	/* Get a fresh memory map.  This allows us to automatically
+	 * avoid treading on any regions that Etherboot is currently
+	 * editing out of the memory map.
+	 */
+	get_memmap ( &memmap );
+
+	/* Look for a suitable memory region */
+	for ( i = 0 ; i < memmap.count ; i++ ) {
+		if ( ( start >= memmap.regions[i].start ) &&
+		     ( end <= memmap.regions[i].end ) ) {
+			/* Found valid region: zero bss and return */
+			memset_user ( segment, filesz, 0, ( memsz - filesz ) );
+			return 0;
+		}
+	}
+
+	/* No suitable memory region found */
+	DBG ( "Segment [%lx,%lx,%lx) does not fit into available memory\n",
+	      start, mid, end );
+	return -ERANGE_SEGMENT;
+}