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
|
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
#include <librm.h>
.section ".note.GNU-stack", "", @progbits
.code16
.arch i386
.section ".prefix", "ax", @progbits
/* UNDI loader
*
* Called by an external program to load our PXE stack.
*/
.globl undiloader
undiloader:
/* Save registers */
pushl %esi
pushl %edi
pushl %ebp
pushw %ds
pushw %es
pushw %bx
/* ROM segment address to %ds */
pushw %cs
popw %ds
/* UNDI loader parameter structure address into %es:%di */
movw %sp, %bx
movw %ss:22(%bx), %di
movw %ss:24(%bx), %es
/* Install to specified real-mode addresses */
pushw %di
movw %es:12(%di), %bx
movw %es:14(%di), %ax
movl image_source, %esi
call undiloader_source
xorl %edi, %edi
orl $0xffffffff, %ebp /* Allow arbitrary relocation */
call install_prealloc
popw %di
/* Jump to .text16 segment */
pushw %ax
pushw $1f
lret
.section ".text16", "ax", @progbits
1:
/* Call UNDI loader C code */
virtcall pxe_loader_call
1: /* Restore registers and return */
popw %bx
popw %es
popw %ds
popl %ebp
popl %edi
popl %esi
lret
/* Update image source address for UNDI loader
*
* Parameters:
* %esi : Image source address
* Returns:
* %esi : Image source address
*/
.section ".prefix", "ax", @progbits
.globl undiloader_source
.weak undiloader_source
undiloader_source:
ret
|
