95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/*
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* PXE image loader for Etherboot.
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*
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* Note: There is no signature check for PXE images because there is
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* no signature. Well done, Intel! Consequently, pxe_probe() must be
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* called last of all the image_probe() routines, because it will
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* *always* claim the image.
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*/
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#ifndef PXE_EXPORT
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#error PXE_IMAGE requires PXE_EXPORT
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#endif
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#include "etherboot.h"
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#include "pxe_callbacks.h"
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#include "pxe_export.h"
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#include "pxe.h"
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unsigned long pxe_load_offset;
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static sector_t pxe_download ( unsigned char *data,
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unsigned int len, int eof );
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static inline os_download_t pxe_probe ( unsigned char *data __unused,
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unsigned int len __unused ) {
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printf("(PXE)");
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pxe_load_offset = 0;
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return pxe_download;
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}
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static sector_t pxe_download ( unsigned char *data,
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unsigned int len, int eof ) {
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unsigned long block_address = PXE_LOAD_ADDRESS + pxe_load_offset;
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PXENV_STATUS_t nbp_exit;
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/* Check segment will fit. We can't do this in probe()
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* because there's nothing in the non-existent header to tell
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* us how long the image is.
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*/
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if ( ! prep_segment ( block_address, block_address + len,
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block_address + len,
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pxe_load_offset, pxe_load_offset + len ) ) {
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longjmp ( restart_etherboot, -2 );
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}
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/* Load block into memory, continue loading until eof */
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memcpy ( phys_to_virt ( block_address ), data, len );
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pxe_load_offset += len;
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if ( ! eof ) {
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return 0;
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}
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/* Start up PXE NBP */
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done ( 0 );
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/* Install and activate a PXE stack */
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pxe_stack = install_pxe_stack ( NULL );
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if ( ensure_pxe_state ( READY ) ) {
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/* Invoke the NBP */
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nbp_exit = xstartpxe();
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} else {
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/* Fake success so we tear down the stack */
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nbp_exit = PXENV_STATUS_SUCCESS;
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}
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/* NBP has three exit codes:
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* PXENV_STATUS_KEEP_UNDI : keep UNDI and boot next device
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* PXENV_STATUS_KEEP_ALL : keep all and boot next device
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* anything else : remove all and boot next device
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*
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* Strictly, we're meant to hand back to the BIOS, but this
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* would prevent the useful combination of "PXE NBP fails, so
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* let Etherboot try to boot its next device". We therefore
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* take liberties.
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*/
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if ( nbp_exit != PXENV_STATUS_KEEP_UNDI &&
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nbp_exit != PXENV_STATUS_KEEP_ALL ) {
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/* Tear down PXE stack */
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remove_pxe_stack();
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}
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/* Boot next device. Under strict PXE compliance, exit back
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* to the BIOS, otherwise let Etherboot move to the next
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* device.
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*/
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#ifdef PXE_STRICT
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longjmp ( restart_etherboot, 255 );
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#else
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longjmp ( restart_etherboot, 4 );
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#endif
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/* Never reached; avoid compiler warning */
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return ( 0 );
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}
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