1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* PXE image loader for Etherboot.
*
* Note: There is no signature check for PXE images because there is
* no signature. Well done, Intel! Consequently, pxe_probe() must be
* called last of all the image_probe() routines, because it will
* *always* claim the image.
*/
#ifndef PXE_EXPORT
#error PXE_IMAGE requires PXE_EXPORT
#endif
#include "etherboot.h"
#include "pxe_callbacks.h"
#include "pxe_export.h"
#include "pxe.h"
unsigned long pxe_load_offset;
static sector_t pxe_download ( unsigned char *data,
unsigned int len, int eof );
static inline os_download_t pxe_probe ( unsigned char *data __unused,
unsigned int len __unused ) {
printf("(PXE)");
pxe_load_offset = 0;
return pxe_download;
}
static sector_t pxe_download ( unsigned char *data,
unsigned int len, int eof ) {
unsigned long block_address = PXE_LOAD_ADDRESS + pxe_load_offset;
PXENV_STATUS_t nbp_exit;
/* Check segment will fit. We can't do this in probe()
* because there's nothing in the non-existent header to tell
* us how long the image is.
*/
if ( ! prep_segment ( block_address, block_address + len,
block_address + len,
pxe_load_offset, pxe_load_offset + len ) ) {
longjmp ( restart_etherboot, -2 );
}
/* Load block into memory, continue loading until eof */
memcpy ( phys_to_virt ( block_address ), data, len );
pxe_load_offset += len;
if ( ! eof ) {
return 0;
}
/* Start up PXE NBP */
done ( 0 );
/* Install and activate a PXE stack */
pxe_stack = install_pxe_stack ( NULL );
if ( ensure_pxe_state ( READY ) ) {
/* Invoke the NBP */
nbp_exit = xstartpxe();
} else {
/* Fake success so we tear down the stack */
nbp_exit = PXENV_STATUS_SUCCESS;
}
/* NBP has three exit codes:
* PXENV_STATUS_KEEP_UNDI : keep UNDI and boot next device
* PXENV_STATUS_KEEP_ALL : keep all and boot next device
* anything else : remove all and boot next device
*
* Strictly, we're meant to hand back to the BIOS, but this
* would prevent the useful combination of "PXE NBP fails, so
* let Etherboot try to boot its next device". We therefore
* take liberties.
*/
if ( nbp_exit != PXENV_STATUS_KEEP_UNDI &&
nbp_exit != PXENV_STATUS_KEEP_ALL ) {
/* Tear down PXE stack */
remove_pxe_stack();
}
/* Boot next device. Under strict PXE compliance, exit back
* to the BIOS, otherwise let Etherboot move to the next
* device.
*/
#ifdef PXE_STRICT
longjmp ( restart_etherboot, 255 );
#else
longjmp ( restart_etherboot, 4 );
#endif
/* Never reached; avoid compiler warning */
return ( 0 );
}
|
