Placeholder bzImage support

src/arch/i386/image/bzimage.c

@@ -0,0 +1,81 @@
+/*
+ * 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.
+ */
+
+/**
+ * @file
+ *
+ * Linux bzImage image format
+ *
+ */
+
+#include <errno.h>
+#include <assert.h>
+#include <realmode.h>
+#include <bzimage.h>
+#include <gpxe/uaccess.h>
+#include <gpxe/image.h>
+#include <gpxe/segment.h>
+#include <gpxe/memmap.h>
+#include <gpxe/shutdown.h>
+
+struct image_type bzimage_image_type __image_type ( PROBE_NORMAL );
+
+/**
+ * Execute bzImage image
+ *
+ * @v image		bzImage image
+ * @ret rc		Return status code
+ */
+static int bzimage_exec ( struct image *image ) {
+}
+
+/**
+ * Load bzImage image into memory
+ *
+ * @v image		bzImage file
+ * @ret rc		Return status code
+ */
+int bzimage_load ( struct image *image ) {
+	struct bzimage_header bzhdr;
+
+	/* Sanity check */
+	if ( image->len < ( BZHDR_OFFSET + sizeof ( bzhdr ) ) ) {
+		DBGC ( image, "BZIMAGE %p too short\n", image );
+		return -ENOEXEC;
+	}
+
+	/* Read and verify header */
+	copy_from_user ( &bzhdr, image->data, BZHDR_OFFSET, sizeof ( bzhdr ) );
+	if ( bzhdr.header != BZIMAGE_SIGNATURE ) {
+		DBGC ( image, "BZIMAGE %p not a bzImage\n", image );
+		return -ENOEXEC;
+	}
+
+	/* This is a bzImage image, valid or otherwise */
+	if ( ! image->type )
+		image->type = &bzimage_image_type;
+
+	return 0;
+}
+
+/** Linux bzImage image type */
+struct image_type bzimage_image_type __image_type ( PROBE_NORMAL ) = {
+	.name = "bzImage",
+	.load = bzimage_load,
+	.exec = bzimage_exec,
+};

src/arch/i386/include/bzimage.h

@@ -0,0 +1,73 @@
+#ifndef _BZIMAGE_H
+#define _BZIMAGE_H
+
+#include <stdint.h>
+
+/**
+ * A bzImage header
+ *
+ * As documented in Documentation/i386/boot.txt
+ */
+struct bzimage_header {
+	/** The size of the setup in sectors
+	 *
+	 * If this field contains 0, assume it contains 4.
+	 */
+	uint8_t setup_sects;
+	/** If set, the root is mounted readonly */
+	uint16_t root_flags;
+	/** DO NOT USE - for bootsect.S use only */
+	uint16_t syssize;
+	/** DO NOT USE - obsolete */
+	uint16_t swap_dev;
+	/** DO NOT USE - for bootsect.S use only */
+	uint16_t ram_size;
+	/** Video mode control */
+	uint16_t vid_mode;
+	/** Default root device number */
+	uint16_t root_dev;
+	/** 0xAA55 magic number */
+	uint16_t boot_flag;
+	/** Jump instruction */
+	uint16_t jump;
+	/** Magic signature "HdrS" */
+	uint32_t header;
+	/** Boot protocol version supported */
+	uint16_t version;
+	/** Boot loader hook (see below) */
+	uint32_t realmode_swtch;
+	/** The load-low segment (0x1000) (obsolete) */
+	uint16_t start_sys;
+	/** Pointer to kernel version string */
+	uint16_t kernel_version;
+	/** Boot loader identifier */
+	uint8_t type_of_loader;
+	/** Boot protocol option flags */
+	uint8_t loadflags;
+	/** Move to high memory size (used with hooks) */
+	uint16_t setup_move_size;
+	/** Boot loader hook (see below) */
+	uint32_t code32_start;
+	/** initrd load address (set by boot loader) */
+	uint32_t ramdisk_image;
+	/** initrd size (set by boot loader) */
+	uint32_t ramdisk_size;
+	/** DO NOT USE - for bootsect.S use only */
+	uint32_t bootsect_kludge;
+	/** Free memory after setup end */
+	uint16_t heap_end_ptr;
+	/** Unused */
+	uint16_t pad1;
+	/** 32-bit pointer to the kernel command line */
+	uint32_t cmd_line_ptr;
+	/** Highest legal initrd address */
+	uint32_t initrd_addr_max;
+} __attribute__ (( packed ));
+
+/** Offset of bzImage header within kernel image */
+#define BZHDR_OFFSET 0x1f1
+
+/** bzImage magic signature value */
+#define BZIMAGE_SIGNATURE 0x53726448
+
+#endif /* _BZIMAGE_H */

src/config.h

@@ -108,6 +108,7 @@
 #undef	IMAGE_WINCE		/* WinCE image support */
 #define	IMAGE_PXE		/* PXE image support */
 #define IMAGE_SCRIPT		/* gPXE script image support */
+#define IMAGE_BZIMAGE		/* Linux bzImage image support */
 
 /* @END general.h */ 
 

src/core/config.c

@@ -140,6 +140,9 @@ REQUIRE_OBJECT ( pxe_image );
 #ifdef IMAGE_SCRIPT
 REQUIRE_OBJECT ( script );
 #endif
+#ifdef IMAGE_BZIMAGE
+REQUIRE_OBJECT ( bzimage );
+#endif
 
 /*
  * Drag in all requested commands