bzimage.c File Reference

Linux bzImage image format. More...

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <realmode.h>
#include <bzimage.h>
#include <initrd.h>
#include <ipxe/uaccess.h>
#include <ipxe/image.h>
#include <ipxe/segment.h>
#include <ipxe/init.h>
#include <ipxe/cpio.h>
#include <ipxe/features.h>

Go to the source code of this file.

Data Structures
struct	bzimage_context
	bzImage context More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FEATURE (FEATURE_IMAGE, "bzImage", DHCP_EB_FEATURE_BZIMAGE, 1)
static int	bzimage_parse_header (struct image *image, struct bzimage_context *bzimg, userptr_t src)
	Parse bzImage header. More...
static void	bzimage_update_header (struct image *image, struct bzimage_context *bzimg, userptr_t dst)
	Update bzImage header in loaded kernel. More...
static int	bzimage_parse_cmdline (struct image *image, struct bzimage_context *bzimg)
	Parse kernel command line for bootloader parameters. More...
static void	bzimage_set_cmdline (struct image *image, struct bzimage_context *bzimg)
	Set command line. More...
static size_t	bzimage_align (size_t len)
	Align initrd length. More...
static size_t	bzimage_load_initrd (struct image *image, struct image *initrd, userptr_t address)
	Load initrd. More...
static int	bzimage_check_initrds (struct image *image, struct bzimage_context *bzimg)
	Check that initrds can be loaded. More...
static void	bzimage_load_initrds (struct image *image, struct bzimage_context *bzimg)
	Load initrds, if any. More...
static int	bzimage_exec (struct image *image)
	Execute bzImage image. More...
int	bzimage_probe (struct image *image)
	Probe bzImage image. More...
struct image_type bzimage_image_type	__image_type (PROBE_NORMAL)
	Linux bzImage image type. More...

Detailed Description

Linux bzImage image format.

Definition in file bzimage.c.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FEATURE()

FEATURE	(	FEATURE_IMAGE	,
		"bzImage"	,
		DHCP_EB_FEATURE_BZIMAGE	,
		1
	)

bzimage_parse_header()

static int bzimage_parse_header ( struct image *  image, struct bzimage_context *  bzimg, userptr_t  src  )

static

Parse bzImage header.

Parameters

image	bzImage file
bzimg	bzImage context
src	bzImage to parse

Return values

rc	Return status code

Definition at line 97 of file bzimage.c.

                                                  {
        unsigned int syssize;
        int is_bzimage;

        /* Sanity check */
        if ( image->len < ( BZI_HDR_OFFSET + sizeof ( bzimg->bzhdr ) ) ) {
                DBGC ( image, "bzImage %p too short for kernel header\n",
                       image );
                return -ENOEXEC;
        }

        /* Read in header structures */
        memset ( bzimg, 0, sizeof ( *bzimg ) );
        copy_from_user ( &bzimg->cmdline_magic, src, BZI_CMDLINE_OFFSET,
                         sizeof ( bzimg->cmdline_magic ) );
        copy_from_user ( &bzimg->bzhdr, src, BZI_HDR_OFFSET,
                         sizeof ( bzimg->bzhdr ) );

        /* Calculate size of real-mode portion */
        bzimg->rm_filesz = ( ( ( bzimg->bzhdr.setup_sects ?
                                 bzimg->bzhdr.setup_sects : 4 ) + 1 ) << 9 );
        if ( bzimg->rm_filesz > image->len ) {
                DBGC ( image, "bzImage %p too short for %zd byte of setup\n",
                       image, bzimg->rm_filesz );
                return -ENOEXEC;
        }
        bzimg->rm_memsz = BZI_ASSUMED_RM_SIZE;

        /* Calculate size of protected-mode portion */
        bzimg->pm_sz = ( image->len - bzimg->rm_filesz );
        syssize = ( ( bzimg->pm_sz + 15 ) / 16 );

        /* Check for signatures and determine version */
        if ( bzimg->bzhdr.boot_flag != BZI_BOOT_FLAG ) {
                DBGC ( image, "bzImage %p missing 55AA signature\n", image );
                return -ENOEXEC;
        }
        if ( bzimg->bzhdr.header == BZI_SIGNATURE ) {
                /* 2.00+ */
                bzimg->version = bzimg->bzhdr.version;
        } else {
                /* Pre-2.00.  Check that the syssize field is correct,
                 * as a guard against accepting arbitrary binary data,
                 * since the 55AA check is pretty lax.  Note that the
                 * syssize field is unreliable for protocols between
                 * 2.00 and 2.03 inclusive, so we should not always
                 * check this field.
                 */
                bzimg->version = 0x0100;
                if ( bzimg->bzhdr.syssize != syssize ) {
                        DBGC ( image, "bzImage %p bad syssize %x (expected "
                               "%x)\n", image, bzimg->bzhdr.syssize, syssize );
                        return -ENOEXEC;
                }
        }

        /* Determine image type */
        is_bzimage = ( ( bzimg->version >= 0x0200 ) ?
                       ( bzimg->bzhdr.loadflags & BZI_LOAD_HIGH ) : 0 );

        /* Calculate load address of real-mode portion */
        bzimg->rm_kernel_seg = ( is_bzimage ? 0x1000 : 0x9000 );
        bzimg->rm_kernel = real_to_user ( bzimg->rm_kernel_seg, 0 );

        /* Allow space for the stack and heap */
        bzimg->rm_memsz += BZI_STACK_SIZE;
        bzimg->rm_heap = bzimg->rm_memsz;

        /* Allow space for the command line */
        bzimg->rm_cmdline = bzimg->rm_memsz;
        bzimg->rm_memsz += BZI_CMDLINE_SIZE;

        /* Calculate load address of protected-mode portion */
        bzimg->pm_kernel = phys_to_user ( is_bzimage ? BZI_LOAD_HIGH_ADDR
                                        : BZI_LOAD_LOW_ADDR );

        /* Extract video mode */
        bzimg->vid_mode = bzimg->bzhdr.vid_mode;

        /* Extract memory limit */
        bzimg->mem_limit = ( ( bzimg->version >= 0x0203 ) ?
                             bzimg->bzhdr.initrd_addr_max : BZI_INITRD_MAX );

        /* Extract command line size */
        bzimg->cmdline_size = ( ( bzimg->version >= 0x0206 ) ?
                                bzimg->bzhdr.cmdline_size : BZI_CMDLINE_SIZE );

        DBGC ( image, "bzImage %p version %04x RM %#lx+%#zx PM %#lx+%#zx "
               "cmdlen %zd\n", image, bzimg->version,
               user_to_phys ( bzimg->rm_kernel, 0 ), bzimg->rm_filesz,
               user_to_phys ( bzimg->pm_kernel, 0 ), bzimg->pm_sz,
               bzimg->cmdline_size );

        return 0;
}

References bzimage_header::boot_flag, bzimage_context::bzhdr, BZI_ASSUMED_RM_SIZE, BZI_BOOT_FLAG, BZI_CMDLINE_OFFSET, BZI_CMDLINE_SIZE, BZI_HDR_OFFSET, BZI_INITRD_MAX, BZI_LOAD_HIGH, BZI_LOAD_HIGH_ADDR, BZI_LOAD_LOW_ADDR, BZI_SIGNATURE, BZI_STACK_SIZE, bzimage_context::cmdline_magic, bzimage_context::cmdline_size, bzimage_header::cmdline_size, copy_from_user(), DBGC, ENOEXEC, bzimage_header::header, bzimage_header::initrd_addr_max, image::len, bzimage_header::loadflags, bzimage_context::mem_limit, memset(), phys_to_user(), bzimage_context::pm_kernel, bzimage_context::pm_sz, real_to_user(), bzimage_context::rm_cmdline, bzimage_context::rm_filesz, bzimage_context::rm_heap, bzimage_context::rm_kernel, bzimage_context::rm_kernel_seg, bzimage_context::rm_memsz, bzimage_header::setup_sects, src, syssize, bzimage_header::syssize, user_to_phys(), bzimage_header::version, bzimage_context::version, bzimage_header::vid_mode, and bzimage_context::vid_mode.

Referenced by bzimage_exec(), and bzimage_probe().

bzimage_update_header()

static void bzimage_update_header ( struct image *  image, struct bzimage_context *  bzimg, userptr_t  dst  )

static

Update bzImage header in loaded kernel.

Parameters

image	bzImage file
bzimg	bzImage context
dst	bzImage to update

Definition at line 202 of file bzimage.c.

                                                    {

        /* Set loader type */
        if ( bzimg->version >= 0x0200 )
                bzimg->bzhdr.type_of_loader = BZI_LOADER_TYPE_IPXE;

        /* Set heap end pointer */
        if ( bzimg->version >= 0x0201 ) {
                bzimg->bzhdr.heap_end_ptr = ( bzimg->rm_heap - 0x200 );
                bzimg->bzhdr.loadflags |= BZI_CAN_USE_HEAP;
        }

        /* Set command line */
        if ( bzimg->version >= 0x0202 ) {
                bzimg->bzhdr.cmd_line_ptr = user_to_phys ( bzimg->rm_kernel,
                                                           bzimg->rm_cmdline );
        } else {
                bzimg->cmdline_magic.magic = BZI_CMDLINE_MAGIC;
                bzimg->cmdline_magic.offset = bzimg->rm_cmdline;
                if ( bzimg->version >= 0x0200 )
                        bzimg->bzhdr.setup_move_size = bzimg->rm_memsz;
        }

        /* Set video mode */
        bzimg->bzhdr.vid_mode = bzimg->vid_mode;

        /* Set initrd address */
        if ( bzimg->version >= 0x0200 ) {
                bzimg->bzhdr.ramdisk_image = bzimg->ramdisk_image;
                bzimg->bzhdr.ramdisk_size = bzimg->ramdisk_size;
        }

        /* Write out header structures */
        copy_to_user ( dst, BZI_CMDLINE_OFFSET, &bzimg->cmdline_magic,
                       sizeof ( bzimg->cmdline_magic ) );
        copy_to_user ( dst, BZI_HDR_OFFSET, &bzimg->bzhdr,
                       sizeof ( bzimg->bzhdr ) );

        DBGC ( image, "bzImage %p vidmode %d\n", image, bzimg->vid_mode );
}

References bzimage_context::bzhdr, BZI_CAN_USE_HEAP, BZI_CMDLINE_MAGIC, BZI_CMDLINE_OFFSET, BZI_HDR_OFFSET, BZI_LOADER_TYPE_IPXE, bzimage_header::cmd_line_ptr, bzimage_context::cmdline_magic, copy_to_user(), DBGC, bzimage_header::heap_end_ptr, bzimage_header::loadflags, bzimage_cmdline::magic, bzimage_cmdline::offset, bzimage_header::ramdisk_image, bzimage_context::ramdisk_image, bzimage_header::ramdisk_size, bzimage_context::ramdisk_size, bzimage_context::rm_cmdline, bzimage_context::rm_heap, bzimage_context::rm_kernel, bzimage_context::rm_memsz, bzimage_header::setup_move_size, bzimage_header::type_of_loader, user_to_phys(), bzimage_context::version, bzimage_header::vid_mode, and bzimage_context::vid_mode.

Referenced by bzimage_exec().

bzimage_parse_cmdline()

static int bzimage_parse_cmdline ( struct image *  image, struct bzimage_context *  bzimg  )

static

Parse kernel command line for bootloader parameters.

Parameters

image	bzImage file
bzimg	bzImage context

Return values

rc	Return status code

Definition at line 252 of file bzimage.c.

                                                                   {
        const char *vga;
        const char *mem;
        char *sep;
        char *end;

        /* Look for "vga=" */
        if ( ( vga = image_argument ( image, "vga=" ) ) ) {
                sep = strchr ( vga, ' ' );
                if ( sep )
                        *sep = '\0';
                if ( strcmp ( vga, "normal" ) == 0 ) {
                        bzimg->vid_mode = BZI_VID_MODE_NORMAL;
                } else if ( strcmp ( vga, "ext" ) == 0 ) {
                        bzimg->vid_mode = BZI_VID_MODE_EXT;
                } else if ( strcmp ( vga, "ask" ) == 0 ) {
                        bzimg->vid_mode = BZI_VID_MODE_ASK;
                } else {
                        bzimg->vid_mode = strtoul ( vga, &end, 0 );
                        if ( *end ) {
                                DBGC ( image, "bzImage %p strange \"vga=\" "
                                       "terminator '%c'\n", image, *end );
                        }
                }
                if ( sep )
                        *sep = ' ';
        }

        /* Look for "mem=" */
        if ( ( mem = image_argument ( image, "mem=" ) ) ) {
                bzimg->mem_limit = strtoul ( mem, &end, 0 );
                switch ( *end ) {
                case 'G':
                case 'g':
                        bzimg->mem_limit <<= 10;
                        /* Fall through */
                case 'M':
                case 'm':
                        bzimg->mem_limit <<= 10;
                        /* Fall through */
                case 'K':
                case 'k':
                        bzimg->mem_limit <<= 10;
                        break;
                case '\0':
                case ' ':
                        break;
                default:
                        DBGC ( image, "bzImage %p strange \"mem=\" "
                               "terminator '%c'\n", image, *end );
                        break;
                }
                bzimg->mem_limit -= 1;
        }

        return 0;
}

References BZI_VID_MODE_ASK, BZI_VID_MODE_EXT, BZI_VID_MODE_NORMAL, DBGC, end, image_argument(), bzimage_context::mem_limit, strchr(), strcmp(), strtoul(), and bzimage_context::vid_mode.

Referenced by bzimage_exec().

bzimage_set_cmdline()

static void bzimage_set_cmdline ( struct image *  image, struct bzimage_context *  bzimg  )

static

Set command line.

Parameters

image	bzImage image
bzimg	bzImage context

Definition at line 317 of file bzimage.c.

                                                                  {
        const char *cmdline = ( image->cmdline ? image->cmdline : "" );
        size_t cmdline_len;

        /* Copy command line down to real-mode portion */
        cmdline_len = ( strlen ( cmdline ) + 1 );
        if ( cmdline_len > bzimg->cmdline_size )
                cmdline_len = bzimg->cmdline_size;
        copy_to_user ( bzimg->rm_kernel, bzimg->rm_cmdline,
                       cmdline, cmdline_len );
        DBGC ( image, "bzImage %p command line \"%s\"\n", image, cmdline );
}

References cmdline, image::cmdline, bzimage_context::cmdline_size, copy_to_user(), DBGC, bzimage_context::rm_cmdline, bzimage_context::rm_kernel, and strlen().

Referenced by bzimage_exec().

bzimage_align()

static size_t bzimage_align ( size_t  len )

inlinestatic

Align initrd length.

Parameters

len

Length

Return values

len	Length rounded up to INITRD_ALIGN

Definition at line 337 of file bzimage.c.

                                                  {

        return ( ( len + INITRD_ALIGN - 1 ) & ~( INITRD_ALIGN - 1 ) );
}

References INITRD_ALIGN, and len.

Referenced by bzimage_check_initrds(), and bzimage_load_initrds().

bzimage_load_initrd()

static size_t bzimage_load_initrd ( struct image *  image, struct image *  initrd, userptr_t  address  )

static

Load initrd.

Parameters

image	bzImage image
initrd	initrd image
address	Address at which to load, or UNULL

Return values

len	Length of loaded image, excluding zero-padding

Definition at line 350 of file bzimage.c.

                                                        {
        const char *filename = cpio_name ( initrd );
        struct cpio_header cpio;
        size_t offset;
        size_t cpio_len;
        size_t pad_len;
        size_t len;
        unsigned int i;

        /* Skip hidden images */
        if ( initrd->flags & IMAGE_HIDDEN )
                return 0;

        /* Determine length of cpio headers for non-prebuilt images */
        len = 0;
        for ( i = 0 ; ( cpio_len = cpio_header ( initrd, i, &cpio ) ) ; i++ )
                len += ( cpio_len + cpio_pad_len ( cpio_len ) );

        /* Copy in initrd image body and construct any cpio headers */
        if ( address ) {
                memmove_user ( address, len, initrd->data, 0, initrd->len );
                memset_user ( address, 0, 0, len );
                offset = 0;
                for ( i = 0 ; ( cpio_len = cpio_header ( initrd, i, &cpio ) ) ;
                      i++ ) {
                        copy_to_user ( address, offset, &cpio,
                                       sizeof ( cpio ) );
                        copy_to_user ( address, ( offset + sizeof ( cpio ) ),
                                       filename,
                                       ( cpio_len - sizeof ( cpio ) ) );
                        offset += ( cpio_len + cpio_pad_len ( cpio_len ) );
                }
                assert ( offset == len );
                DBGC ( image, "bzImage %p initrd %p [%#08lx,%#08lx,%#08lx)"
                       "%s%s\n", image, initrd, user_to_phys ( address, 0 ),
                       user_to_phys ( address, offset ),
                       user_to_phys ( address, ( offset + initrd->len ) ),
                       ( filename ? " " : "" ), ( filename ? filename : "" ) );
                DBGC2_MD5A ( image, user_to_phys ( address, offset ),
                             user_to_virt ( address, offset ), initrd->len );
        }
        len += initrd->len;

        /* Zero-pad to next INITRD_ALIGN boundary */
        pad_len = ( ( -len ) & ( INITRD_ALIGN - 1 ) );
        if ( address )
                memset_user ( address, len, 0, pad_len );

        return len;
}

References address, assert(), copy_to_user(), cpio_header(), cpio_name(), cpio_pad_len(), image::data, DBGC, DBGC2_MD5A, image::flags, IMAGE_HIDDEN, INITRD_ALIGN, len, image::len, memmove_user(), memset_user(), offset, pad_len, user_to_phys(), and user_to_virt().

Referenced by bzimage_check_initrds(), and bzimage_load_initrds().

bzimage_check_initrds()

static int bzimage_check_initrds ( struct image *  image, struct bzimage_context *  bzimg  )

static

Check that initrds can be loaded.

Parameters

image	bzImage image
bzimg	bzImage context

Return values

rc	Return status code

Definition at line 410 of file bzimage.c.

                                                                   {
        struct image *initrd;
        userptr_t bottom;
        size_t len = 0;
        int rc;

        /* Calculate total loaded length of initrds */
        for_each_image ( initrd ) {

                /* Calculate length */
                len += bzimage_load_initrd ( image, initrd, UNULL );
                len = bzimage_align ( len );

                DBGC ( image, "bzImage %p initrd %p from [%#08lx,%#08lx)%s%s\n",
                       image, initrd, user_to_phys ( initrd->data, 0 ),
                       user_to_phys ( initrd->data, initrd->len ),
                       ( initrd->cmdline ? " " : "" ),
                       ( initrd->cmdline ? initrd->cmdline : "" ) );
                DBGC2_MD5A ( image, user_to_phys ( initrd->data, 0 ),
                             user_to_virt ( initrd->data, 0 ), initrd->len );
        }

        /* Calculate lowest usable address */
        bottom = userptr_add ( bzimg->pm_kernel, bzimg->pm_sz );

        /* Check that total length fits within space available for
         * reshuffling.  This is a conservative check, since CPIO
         * headers are not present during reshuffling, but this
         * doesn't hurt and keeps the code simple.
         */
        if ( ( rc = initrd_reshuffle_check ( len, bottom ) ) != 0 ) {
                DBGC ( image, "bzImage %p failed reshuffle check: %s\n",
                       image, strerror ( rc ) );
                return rc;
        }

        /* Check that total length fits within kernel's memory limit */
        if ( user_to_phys ( bottom, len ) > bzimg->mem_limit ) {
                DBGC ( image, "bzImage %p not enough space for initrds\n",
                       image );
                return -ENOBUFS;
        }

        return 0;
}

References bottom, bzimage_align(), bzimage_load_initrd(), image::cmdline, image::data, DBGC, DBGC2_MD5A, ENOBUFS, for_each_image, initrd_reshuffle_check(), len, image::len, bzimage_context::mem_limit, bzimage_context::pm_kernel, bzimage_context::pm_sz, rc, strerror(), UNULL, user_to_phys(), user_to_virt(), and userptr_add().

Referenced by bzimage_exec().

bzimage_load_initrds()

static void bzimage_load_initrds ( struct image *  image, struct bzimage_context *  bzimg  )

static

Load initrds, if any.

Parameters

image	bzImage image
bzimg	bzImage context

Definition at line 463 of file bzimage.c.

                                                                   {
        struct image *initrd;
        struct image *highest = NULL;
        struct image *other;
        userptr_t top;
        userptr_t dest;
        size_t offset;
        size_t len;

        /* Reshuffle initrds into desired order */
        initrd_reshuffle ( userptr_add ( bzimg->pm_kernel, bzimg->pm_sz ) );

        /* Find highest initrd */
        for_each_image ( initrd ) {
                if ( ( highest == NULL ) ||
                     ( userptr_sub ( initrd->data, highest->data ) > 0 ) ) {
                        highest = initrd;
                }
        }

        /* Do nothing if there are no initrds */
        if ( ! highest )
                return;

        /* Find highest usable address */
        top = userptr_add ( highest->data, bzimage_align ( highest->len ) );
        if ( user_to_phys ( top, -1 ) > bzimg->mem_limit ) {
                top = phys_to_user ( ( bzimg->mem_limit + 1 ) &
                                     ~( INITRD_ALIGN - 1 ) );
        }
        DBGC ( image, "bzImage %p loading initrds from %#08lx downwards\n",
               image, user_to_phys ( top, -1 ) );

        /* Load initrds in order */
        for_each_image ( initrd ) {

                /* Calculate cumulative length of following
                 * initrds (including padding).
                 */
                offset = 0;
                for_each_image ( other ) {
                        if ( other == initrd )
                                offset = 0;
                        offset += bzimage_load_initrd ( image, other, UNULL );
                        offset = bzimage_align ( offset );
                }

                /* Load initrd at this address */
                dest = userptr_add ( top, -offset );
                len = bzimage_load_initrd ( image, initrd, dest );

                /* Record initrd location */
                if ( ! bzimg->ramdisk_image )
                        bzimg->ramdisk_image = user_to_phys ( dest, 0 );
                bzimg->ramdisk_size = ( user_to_phys ( dest, len ) -
                                        bzimg->ramdisk_image );
        }
        DBGC ( image, "bzImage %p initrds at [%#08lx,%#08lx)\n",
               image, bzimg->ramdisk_image,
               ( bzimg->ramdisk_image + bzimg->ramdisk_size ) );
}

References bzimage_align(), bzimage_load_initrd(), image::data, DBGC, dest, for_each_image, INITRD_ALIGN, initrd_reshuffle(), len, image::len, bzimage_context::mem_limit, NULL, offset, phys_to_user(), bzimage_context::pm_kernel, bzimage_context::pm_sz, bzimage_context::ramdisk_image, bzimage_context::ramdisk_size, top, UNULL, user_to_phys(), userptr_add(), and userptr_sub().

Referenced by bzimage_exec().

bzimage_exec()

static int bzimage_exec ( struct image *  image )

static

Execute bzImage image.

Parameters

image

bzImage image

Return values

rc	Return status code

Definition at line 532 of file bzimage.c.

                                                {
        struct bzimage_context bzimg;
        int rc;

        /* Read and parse header from image */
        if ( ( rc = bzimage_parse_header ( image, &bzimg,
                                           image->data ) ) != 0 )
                return rc;

        /* Prepare segments */
        if ( ( rc = prep_segment ( bzimg.rm_kernel, bzimg.rm_filesz,
                                   bzimg.rm_memsz ) ) != 0 ) {
                DBGC ( image, "bzImage %p could not prepare RM segment: %s\n",
                       image, strerror ( rc ) );
                return rc;
        }
        if ( ( rc = prep_segment ( bzimg.pm_kernel, bzimg.pm_sz,
                                   bzimg.pm_sz ) ) != 0 ) {
                DBGC ( image, "bzImage %p could not prepare PM segment: %s\n",
                       image, strerror ( rc ) );
                return rc;
        }

        /* Parse command line for bootloader parameters */
        if ( ( rc = bzimage_parse_cmdline ( image, &bzimg ) ) != 0)
                return rc;

        /* Check that initrds can be loaded */
        if ( ( rc = bzimage_check_initrds ( image, &bzimg ) ) != 0 )
                return rc;

        /* Remove kernel from image list (without invalidating image pointer) */
        unregister_image ( image_get ( image ) );

        /* Load segments */
        memcpy_user ( bzimg.rm_kernel, 0, image->data,
                      0, bzimg.rm_filesz );
        memcpy_user ( bzimg.pm_kernel, 0, image->data,
                      bzimg.rm_filesz, bzimg.pm_sz );

        /* Store command line */
        bzimage_set_cmdline ( image, &bzimg );

        /* Prepare for exiting.  Must do this before loading initrds,
         * since loading the initrds will corrupt the external heap.
         */
        shutdown_boot();

        /* Load any initrds */
        bzimage_load_initrds ( image, &bzimg );

        /* Update kernel header */
        bzimage_update_header ( image, &bzimg, bzimg.rm_kernel );

        DBGC ( image, "bzImage %p jumping to RM kernel at %04x:0000 "
               "(stack %04x:%04zx)\n", image, ( bzimg.rm_kernel_seg + 0x20 ),
               bzimg.rm_kernel_seg, bzimg.rm_heap );

        /* Jump to the kernel */
        __asm__ __volatile__ ( REAL_CODE ( "movw %w0, %%ds\n\t"
                                           "movw %w0, %%es\n\t"
                                           "movw %w0, %%fs\n\t"
                                           "movw %w0, %%gs\n\t"
                                           "movw %w0, %%ss\n\t"
                                           "movw %w1, %%sp\n\t"
                                           "pushw %w2\n\t"
                                           "pushw $0\n\t"
                                           "lret\n\t" )
                               : : "R" ( bzimg.rm_kernel_seg ),
                                   "R" ( bzimg.rm_heap ),
                                   "R" ( bzimg.rm_kernel_seg + 0x20 ) );

        /* There is no way for the image to return, since we provide
         * no return address.
         */
        assert ( 0 );

        return -ECANCELED; /* -EIMPOSSIBLE */
}

References __asm__(), __volatile__(), assert(), bzimage_check_initrds(), bzimage_load_initrds(), bzimage_parse_cmdline(), bzimage_parse_header(), bzimage_set_cmdline(), bzimage_update_header(), image::data, DBGC, ECANCELED, image_get(), memcpy_user(), bzimage_context::pm_kernel, bzimage_context::pm_sz, prep_segment(), rc, REAL_CODE, bzimage_context::rm_filesz, bzimage_context::rm_heap, bzimage_context::rm_kernel, bzimage_context::rm_kernel_seg, bzimage_context::rm_memsz, shutdown_boot(), strerror(), and unregister_image().

bzimage_probe()

int bzimage_probe

(

struct image *

image

)

Probe bzImage image.

Parameters

image

bzImage file

Return values

rc	Return status code

Definition at line 618 of file bzimage.c.

                                          {
        struct bzimage_context bzimg;
        int rc;

        /* Read and parse header from image */
        if ( ( rc = bzimage_parse_header ( image, &bzimg,
                                           image->data ) ) != 0 )
                return rc;

        return 0;
}

References bzimage_parse_header(), image::data, and rc.

__image_type()

struct image_type bzimage_image_type __image_type

(

PROBE_NORMAL

)

Linux bzImage image type.