qemu/roms/ipxe/src/image/embedded.c

   1 /** @file
   2  *
   3  * Embedded image support
   4  *
   5  * Embedded images are images built into the iPXE binary and do not require
   6  * fetching over the network.
   7  */
   8
   9 FILE_LICENCE ( GPL2_OR_LATER );
  10
  11 #include <string.h>
  12 #include <ipxe/image.h>
  13 #include <ipxe/uaccess.h>
  14 #include <ipxe/init.h>
  15
  16 /* Raw image data for all embedded images */
  17 #undef EMBED
  18 #define EMBED( _index, _path, _name )                                   \
  19         extern char embedded_image_ ## _index ## _data[];               \
  20         extern char embedded_image_ ## _index ## _len[];                \
  21         __asm__ ( ".section \".rodata\", \"a\", @progbits\n\t"          \
  22                   "\nembedded_image_" #_index "_data:\n\t"              \
  23                   ".incbin \"" _path "\"\n\t"                           \
  24                   "\nembedded_image_" #_index "_end:\n\t"               \
  25                   ".equ embedded_image_" #_index "_len, "               \
  26                         "( embedded_image_" #_index "_end - "           \
  27                         "  embedded_image_" #_index "_data )\n\t"       \
  28                   ".previous\n\t" );
  29 EMBED_ALL
  30
  31 /* Image structures for all embedded images */
  32 #undef EMBED
  33 #define EMBED( _index, _path, _name ) {                                 \
  34         .refcnt = REF_INIT ( ref_no_free ),                             \
  35         .name = _name,                                                  \
  36         .data = ( userptr_t ) ( embedded_image_ ## _index ## _data ),   \
  37         .len = ( size_t ) embedded_image_ ## _index ## _len,            \
  38 },
  39 static struct image embedded_images[] = {
  40         EMBED_ALL
  41 };
  42
  43 /**
  44  * Register all embedded images
  45  */
  46 static void embedded_init ( void ) {
  47         int i;
  48         struct image *image;
  49         void *data;
  50         int rc;
  51
  52         /* Skip if we have no embedded images */
  53         if ( ! sizeof ( embedded_images ) )
  54                 return;
  55
  56         /* Fix up data pointers and register images */
  57         for ( i = 0 ; i < ( int ) ( sizeof ( embedded_images ) /
  58                                     sizeof ( embedded_images[0] ) ) ; i++ ) {
  59                 image = &embedded_images[i];
  60
  61                 /* virt_to_user() cannot be used in a static
  62                  * initialiser, so we cast the pointer to a userptr_t
  63                  * in the initialiser and fix it up here.  (This will
  64                  * actually be a no-op on most platforms.)
  65                  */
  66                 data = ( ( void * ) image->data );
  67                 image->data = virt_to_user ( data );
  68
  69                 DBG ( "Embedded image \"%s\": %zd bytes at %p\n",
  70                       image->name, image->len, data );
  71
  72                 if ( ( rc = register_image ( image ) ) != 0 ) {
  73                         DBG ( "Could not register embedded image \"%s\": "
  74                               "%s\n", image->name, strerror ( rc ) );
  75                         return;
  76                 }
  77         }
  78
  79         /* Select the first image */
  80         image = &embedded_images[0];
  81         if ( ( rc = image_select ( image ) ) != 0 ) {
  82                 DBG ( "Could not select embedded image \"%s\": %s\n",
  83                       image->name, strerror ( rc ) );
  84                 return;
  85         }
  86 }
  87
  88 /** Embedded image initialisation function */
  89 struct init_fn embedded_init_fn __init_fn ( INIT_LATE ) = {
  90         .initialise = embedded_init,
  91 };