source: bootcd/isolinux/syslinux-6.03/gpxe/src/arch/i386/interface/pcbios/iscsiboot.c

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <gpxe/iscsi.h>
#include <gpxe/netdevice.h>
#include <gpxe/ibft.h>
#include <gpxe/sanboot.h>
#include <int13.h>

FILE_LICENCE ( GPL2_OR_LATER );

static int iscsiboot ( const char *root_path ) {
        struct scsi_device *scsi;
        struct int13_drive *drive;
        int rc;

        scsi = zalloc ( sizeof ( *scsi ) );
        if ( ! scsi ) {
                rc = -ENOMEM;
                goto err_alloc_scsi;
        }
        drive = zalloc ( sizeof ( *drive ) );
        if ( ! drive ) {
                rc = -ENOMEM;
                goto err_alloc_drive;
        }

        if ( ( rc = iscsi_attach ( scsi, root_path ) ) != 0 ) {
                printf ( "Could not attach iSCSI device: %s\n",
                         strerror ( rc ) );
                goto err_attach;
        }
        if ( ( rc = init_scsidev ( scsi ) ) != 0 ) {
                printf ( "Could not initialise iSCSI device: %s\n",
                         strerror ( rc ) );
                goto err_init;
        }

        drive->blockdev = &scsi->blockdev;

        /* FIXME: ugly, ugly hack */
        struct net_device *netdev = last_opened_netdev();
        struct iscsi_session *iscsi =
                container_of ( scsi->backend, struct iscsi_session, refcnt );
        ibft_fill_data ( netdev, iscsi );

        register_int13_drive ( drive );
        printf ( "Registered as BIOS drive %#02x\n", drive->drive );
        printf ( "Booting from BIOS drive %#02x\n", drive->drive );
        rc = int13_boot ( drive->drive );
        printf ( "Boot failed\n" );

        /* Leave drive registered, if instructed to do so */
        if ( keep_san() )
                return rc;

        printf ( "Unregistering BIOS drive %#02x\n", drive->drive );
        unregister_int13_drive ( drive );

 err_init:
        iscsi_detach ( scsi );
 err_attach:
        free ( drive );
 err_alloc_drive:
        free ( scsi );
 err_alloc_scsi:
        return rc;
}

struct sanboot_protocol iscsi_sanboot_protocol __sanboot_protocol = {
        .prefix = "iscsi:",
        .boot = iscsiboot,
};