#ifndef _IPXE_IMAGE_H
#define _IPXE_IMAGE_H
/**
* @file
*
* Executable images
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/tables.h>
#include <ipxe/list.h>
#include <ipxe/uaccess.h>
#include <ipxe/refcnt.h>
struct uri;
struct pixel_buffer;
struct asn1_cursor;
struct image_type;
/** An executable image */
struct image {
/** Reference count */
struct refcnt refcnt;
/** List of registered images */
struct list_head list;
/** URI of image */
struct uri *uri;
/** Name */
char *name;
/** Flags */
unsigned int flags;
/** Command line to pass to image */
char *cmdline;
/** Raw file image */
userptr_t data;
/** Length of raw file image */
size_t len;
/** Image type, if known */
struct image_type *type;
/** Replacement image
*
* An image wishing to replace itself with another image (in a
* style similar to a Unix exec() call) should return from its
* exec() method with the replacement image set to point to
* the new image.
*
* If an image unregisters itself as a result of being
* executed, it must make sure that its replacement image (if
* any) is registered, otherwise the replacement is likely to
* be freed before it can be executed.
*/
struct image *replacement;
};
/** Image is registered */
#define IMAGE_REGISTERED 0x00001
/** Image is selected for execution */
#define IMAGE_SELECTED 0x0002
/** Image is trusted */
#define IMAGE_TRUSTED 0x0004
/** Image will be automatically unregistered after execution */
#define IMAGE_AUTO_UNREGISTER 0x0008
/** An executable image type */
struct image_type {
/** Name of this image type */
char *name;
/**
* Probe image
*
* @v image Image
* @ret rc Return status code
*
* Return success if the image is of this image type.
*/
int ( * probe ) ( struct image *image );
/**
* Execute image
*
* @v image Image
* @ret rc Return status code
*/
int ( * exec ) ( struct image *image );
/**
* Create pixel buffer from image
*
* @v image Image
* @v pixbuf Pixel buffer to fill in
* @ret rc Return status code
*/
int ( * pixbuf ) ( struct image *image, struct pixel_buffer **pixbuf );
/**
* Extract ASN.1 object from image
*
* @v image Image
* @v offset Offset within image
* @v cursor ASN.1 cursor to fill in
* @ret next Offset to next image, or negative error
*
* The caller is responsible for eventually calling free() on
* the allocated ASN.1 cursor.
*/
int ( * asn1 ) ( struct image *image, size_t offset,
struct asn1_cursor **cursor );
};
/**
* Multiboot image probe priority
*
* Multiboot images are also valid executables in another format
* (e.g. ELF), so we must perform the multiboot probe first.
*/
#define PROBE_MULTIBOOT 01
/**
* Normal image probe priority
*/
#define PROBE_NORMAL 02
/**
* PXE image probe priority
*
* PXE images have no signature checks, so will claim all image files.
* They must therefore be tried last in the probe order list.
*/
#define PROBE_PXE 03
/** Executable image type table */
#define IMAGE_TYPES __table ( struct image_type, "image_types" )
/** An executable image type */
#define __image_type( probe_order ) __table_entry ( IMAGE_TYPES, probe_order )
extern struct list_head images;
extern struct image *current_image;
/** Iterate over all registered images */
#define for_each_image( image ) \
list_for_each_entry ( (image), &images, list )
/** Iterate over all registered images, safe against deletion */
#define for_each_image_safe( image, tmp ) \
list_for_each_entry_safe ( (image), (tmp), &images, list )
/**
* Test for existence of images
*
* @ret existence Some images exist
*/
static inline int have_images ( void ) {
return ( ! list_empty ( &images ) );
}
/**
* Retrieve first image
*
* @ret image Image, or NULL
*/
static inline struct image * first_image ( void ) {
return list_first_entry ( &images, struct image, list );
}
extern struct image * alloc_image ( struct uri *uri );
extern int image_set_uri ( struct image *image, struct uri *uri );
extern int image_set_name ( struct image *image, const char *name );
extern int image_set_cmdline ( struct image *image, const char *cmdline );
extern int register_image ( struct image *image );
extern void unregister_image ( struct image *image );
struct image * find_image ( const char *name );
extern int image_exec ( struct image *image );
extern int image_replace ( struct image *replacement );
extern int image_select ( struct image *image );
extern struct image * image_find_selected ( void );
extern int image_set_trust ( int require_trusted, int permanent );
extern int image_pixbuf ( struct image *image, struct pixel_buffer **pixbuf );
extern int image_asn1 ( struct image *image, size_t offset,
struct asn1_cursor **cursor );
/**
* Increment reference count on an image
*
* @v image Image
* @ret image Image
*/
static inline struct image * image_get ( struct image *image ) {
ref_get ( &image->refcnt );
return image;
}
/**
* Decrement reference count on an image
*
* @v image Image
*/
static inline void image_put ( struct image *image ) {
ref_put ( &image->refcnt );
}
/**
* Clear image command line
*
* @v image Image
*/
static inline void image_clear_cmdline ( struct image *image ) {
image_set_cmdline ( image, NULL );
}
/**
* Set image as trusted
*
* @v image Image
*/
static inline void image_trust ( struct image *image ) {
image->flags |= IMAGE_TRUSTED;
}
/**
* Set image as untrusted
*
* @v image Image
*/
static inline void image_untrust ( struct image *image ) {
image->flags &= ~IMAGE_TRUSTED;
}
#endif /* _IPXE_IMAGE_H */
