embedded.c

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/** @file
 *
 * Embedded image support
 *
 * Embedded images are images built into the iPXE binary and do not require
 * fetching over the network.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

#include <string.h>
#include <ipxe/image.h>
#include <ipxe/init.h>

/* Raw image data for all embedded images */
#undef EMBED
#define EMBED( _index, _path, _name )                                   \
        extern char embedded_image_ ## _index ## _data[];               \
        extern size_t ABS_SYMBOL ( embedded_image_ ## _index ## _len ); \
        __asm__ ( ".section \".data\", \"aw\", " PROGBITS "\n\t"        \
                  "\nembedded_image_" #_index "_data:\n\t"              \
                  ".incbin \"" _path "\"\n\t"                           \
                  "\nembedded_image_" #_index "_end:\n\t"               \
                  ".equ embedded_image_" #_index "_len, "               \
                        "( embedded_image_" #_index "_end - "           \
                        "  embedded_image_" #_index "_data )\n\t"       \
                  ".previous\n\t" );
EMBED_ALL

/* Image structures for all embedded images */
#undef EMBED
#define EMBED( _index, _path, _name ) {                                 \
        .refcnt = REF_INIT ( free_image ),                              \
        .name = _name,                                                  \
        .flags = ( IMAGE_STATIC | IMAGE_STATIC_NAME ),                  \
        .rwdata = embedded_image_ ## _index ## _data,                   \
        .len = ABS_VALUE_INIT ( embedded_image_ ## _index ## _len ),    \
},
static struct image embedded_images[] = {
        EMBED_ALL
};

/**
 * Register all embedded images
 */
static void embedded_init ( void ) {
        int i;
        struct image *image;
        void *data;
        int rc;

        /* Skip if we have no embedded images */
        if ( ! sizeof ( embedded_images ) )
                return;

        /* Fix up data pointers and register images */
        for ( i = 0 ; i < ( int ) ( sizeof ( embedded_images ) /
                                    sizeof ( embedded_images[0] ) ) ; i++ ) {
                image = &embedded_images[i];
                DBG ( "Embedded image \"%s\": %zd bytes at %p\n",
                      image->name, image->len, data );
                if ( ( rc = register_image ( image ) ) != 0 ) {
                        DBG ( "Could not register embedded image \"%s\": "
                              "%s\n", image->name, strerror ( rc ) );
                        return;
                }
        }

        /* Select the first image */
        image = &embedded_images[0];
        if ( ( rc = image_select ( image ) ) != 0 ) {
                DBG ( "Could not select embedded image \"%s\": %s\n",
                      image->name, strerror ( rc ) );
                return;
        }

        /* Trust the selected image implicitly */
        image_trust ( image );
}

/** Embedded image initialisation function */
struct init_fn embedded_init_fn __init_fn ( INIT_LATE ) = {
        .name = "embedded",
        .initialise = embedded_init,
};