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
|
/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2009 H. Peter Anvin - All Rights Reserved
* Copyright 2009 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* shuffle_pm.c
*
* Shuffle and boot to protected mode code
*/
#include <stdlib.h>
#include <inttypes.h>
#include <com32.h>
#include <string.h>
#include <syslinux/movebits.h>
#include <syslinux/bootpm.h>
int syslinux_shuffle_boot_pm(struct syslinux_movelist *fraglist,
struct syslinux_memmap *memmap,
uint16_t bootflags,
struct syslinux_pm_regs *regs)
{
int nd;
com32sys_t ireg;
char *regbuf;
uint8_t handoff_code[9*5], *p;
const uint32_t *rp;
int i, rv;
struct syslinux_memmap *tmap;
addr_t regstub, stublen, safe;
tmap = syslinux_target_memmap(fraglist, memmap);
if (!tmap)
return -1;
regstub = 0x800; /* Locate anywhere above this point */
stublen = sizeof handoff_code;
rv = syslinux_memmap_find(tmap, SMT_FREE, ®stub, &stublen, 1);
syslinux_free_memmap(tmap);
if (rv)
return -1;
/* Build register-setting stub */
p = handoff_code;
rp = (const uint32_t *)regs;
for (i = 0; i < 8; i++) {
*p = 0xb8 + i; /* MOV gpr,imm32 */
*(uint32_t *)(p+1) = *rp++;
p += 5;
}
*p = 0xe9; /* JMP */
*(uint32_t *)(p+1) = regs->eip - regstub - sizeof handoff_code;
/* Add register-setting stub to shuffle list */
if (syslinux_add_movelist(&fraglist, regstub, (addr_t)handoff_code,
sizeof handoff_code))
return -1;
return syslinux_do_shuffle(fraglist, memmap, regstub, 1, bootflags);
}
|
