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Diffstat (limited to 'debian/grub-extras/disabled/gpxe/src/include/gpxe/image.h')
| -rw-r--r-- | debian/grub-extras/disabled/gpxe/src/include/gpxe/image.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/debian/grub-extras/disabled/gpxe/src/include/gpxe/image.h b/debian/grub-extras/disabled/gpxe/src/include/gpxe/image.h new file mode 100644 index 0000000..10db8af --- /dev/null +++ b/debian/grub-extras/disabled/gpxe/src/include/gpxe/image.h @@ -0,0 +1,194 @@ +#ifndef _GPXE_IMAGE_H +#define _GPXE_IMAGE_H + +/** + * @file + * + * Executable/loadable images + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <gpxe/tables.h> +#include <gpxe/list.h> +#include <gpxe/uaccess.h> +#include <gpxe/refcnt.h> + +struct uri; +struct image_type; + +/** An executable or loadable 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[16]; + /** 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; + /** Image type private data */ + union { + physaddr_t phys; + userptr_t user; + unsigned long ul; + } priv; + + /** 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. The new image must already be in a suitable + * state for execution (i.e. loaded). + * + * 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 loaded */ +#define IMAGE_LOADED 0x0001 + +/** An executable or loadable image type */ +struct image_type { + /** Name of this image type */ + char *name; + /** + * Load image into memory + * + * @v image Executable/loadable image + * @ret rc Return status code + * + * Load the image into memory at the correct location as + * determined by the file format. + * + * If the file image is in the correct format, the method must + * update @c image->type to point to its own type (unless @c + * image->type is already set). This allows the autoloading + * code to disambiguate between "this is not my image format" + * and "there is something wrong with this image". In + * particular, setting @c image->type and then returning an + * error will cause image_autoload() to abort and return an + * error, rather than continuing to the next image type. + */ + int ( * load ) ( struct image *image ); + /** + * Execute loaded image + * + * @v image Loaded image + * @ret rc Return status code + * + * Note that the image may be invalidated by the act of + * execution, i.e. an image is allowed to choose to unregister + * (and so potentially free) itself. + */ + int ( * exec ) ( struct image *image ); +}; + +/** + * 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 or loadable image type table */ +#define IMAGE_TYPES __table ( struct image_type, "image_types" ) + +/** An executable or loadable image type */ +#define __image_type( probe_order ) __table_entry ( IMAGE_TYPES, probe_order ) + +extern struct list_head images; + +/** Iterate over all registered images */ +#define for_each_image( image ) \ + list_for_each_entry ( (image), &images, list ) + +/** + * Test for existence of images + * + * @ret existence Some images exist + */ +static inline int have_images ( void ) { + return ( ! list_empty ( &images ) ); +} + +extern struct image * alloc_image ( void ); +extern int image_set_uri ( struct image *image, struct uri *uri ); +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 ); +extern void promote_image ( struct image *image ); +struct image * find_image ( const char *name ); +extern int image_load ( struct image *image ); +extern int image_autoload ( struct image *image ); +extern int image_exec ( struct image *image ); +extern int register_and_autoload_image ( struct image *image ); +extern int register_and_autoexec_image ( struct image *image ); + +/** + * 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 ); +} + +/** + * Set image name + * + * @v image Image + * @v name New image name + * @ret rc Return status code + */ +static inline int image_set_name ( struct image *image, const char *name ) { + strncpy ( image->name, name, ( sizeof ( image->name ) - 1 ) ); + return 0; +} + +#endif /* _GPXE_IMAGE_H */ |