Split bootsector execution code out into bootsector.c.

Added basic El Torito ISO image boot capability

src/drivers/block/ramdisk.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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gpxe/blockdev.h>
+#include <gpxe/ramdisk.h>
+
+/**
+ * @file
+ *
+ * RAM disks
+ *
+ */
+
+static inline __attribute__ (( always_inline )) struct ramdisk *
+block_to_ramdisk ( struct block_device *blockdev ) {
+	return container_of ( blockdev, struct ramdisk, blockdev );
+}
+
+/**
+ * Read block
+ *
+ * @v blockdev		Block device
+ * @v block		Block number
+ * @v count		Block count
+ * @v buffer		Data buffer
+ * @ret rc		Return status code
+ */
+static int ramdisk_read ( struct block_device *blockdev, uint64_t block,
+			  unsigned long count, userptr_t buffer ) {
+	struct ramdisk *ramdisk = block_to_ramdisk ( blockdev );
+	unsigned long offset = ( block * blockdev->blksize );
+	unsigned long length = ( count * blockdev->blksize );
+
+	DBGC ( ramdisk, "RAMDISK %p reading [%lx,%lx)\n",
+	       ramdisk, offset, length );
+
+	memcpy_user ( buffer, 0, ramdisk->data, offset, length );
+	return 0;
+}
+
+/**
+ * Write block
+ *
+ * @v blockdev		Block device
+ * @v block		Block number
+ * @v count		Block count
+ * @v buffer		Data buffer
+ * @ret rc		Return status code
+ */
+static int ramdisk_write ( struct block_device *blockdev, uint64_t block,
+			   unsigned long count, userptr_t buffer ) {
+	struct ramdisk *ramdisk = block_to_ramdisk ( blockdev );
+	unsigned long offset = ( block * blockdev->blksize );
+	unsigned long length = ( count * blockdev->blksize );
+
+	DBGC ( ramdisk, "RAMDISK %p writing [%lx,%lx)\n",
+	       ramdisk, offset, length );
+
+	memcpy_user ( ramdisk->data, offset, buffer, 0, length );
+	return 0;
+}
+
+int init_ramdisk ( struct ramdisk *ramdisk, userptr_t data, size_t len,
+		   unsigned int blksize ) {
+	
+	if ( ! blksize )
+		blksize = 512;
+
+	ramdisk->data = data;
+	ramdisk->blockdev.read = ramdisk_read;
+	ramdisk->blockdev.write = ramdisk_write;
+	ramdisk->blockdev.blksize = blksize;
+	ramdisk->blockdev.blocks = ( len / blksize );
+
+	return 0;
+}