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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* linux_trampoline
*
* Copyright (C) 2013 Patrick Georgi <patrick@georgi-clan.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/* NOTE: THIS CODE MUST REMAIN POSITION INDEPENDENT
* IT SHOULDN'T USE THE STACK
* AND IN GENERAL EXPECT NOTHING BUT RAM TO WORK
*/
.code32
.data
#include "linux_trampoline.h"
#define HEADER_SIG 0x4f49424c // LBIO little endian
#define CB_TAG_FORWARD 0x11
#define CB_TAG_MEMORY 0x1
#define CB_TAG_FRAMEBUFFER 0x12
#define E820_NR_OFFSET 0x1e8
#define LINUX_ENTRY_OFFSET 0x214
#define E820_OFFSET 0x2d0
.trampoline_start:
cld
xor %edx, %edx
mov $0, %ecx
.headerSearch:
mov $0x10000, %ebx
add %ecx, %ebx
mov (%ecx), %eax
cmp $HEADER_SIG, %eax
je .headerSearchDone // found the header
add $16, %ecx
cmp %ecx, %ebx
jne .headerSearch
.headerSearchDone:
cmp %ecx, %ebx // reached the end == not found anything?
je 2f // give up
// we assume the checksum is okay, no test
mov 4(%ecx), %ebx
add %ecx, %ebx // ebx = cb_header + header_bytes
mov 20(%ecx), %ecx // ecx = table_entries
.tableScan:
cmp $CB_TAG_FORWARD, (%ebx)
jne .testMemory
/* forward tag: assume 32bit pointer */
mov 8(%ebx), %ecx
jmp .headerSearch
.testMemory:
cmp $CB_TAG_MEMORY, (%ebx)
jne .testFramebuffer
/* memory tag: copy e820 map and entry count. also determine alt_mem_k */
mov 4(%ebx), %eax
sub $8, %eax
shr $2, %eax /* eax = number of dwords of e820 data */
cmp $(32 * 5), %eax /* linux wants at most 32 entries of 5 dwords */
jng 1f
mov $(32 * 5), %eax /* only copy 32 entries */
1:
mov %eax, %esi
mov $5, %edi
div %edi
mov %eax, (LINUX_PARAM_LOC + E820_NR_OFFSET)
mov %esi, %eax
xchg %eax, %ecx
lea 8(%ebx), %esi /* e820 data source */
mov $(LINUX_PARAM_LOC + E820_OFFSET), %edi
rep movsl
xchg %eax, %ecx
jmp .endScan
.testFramebuffer:
cmp $CB_TAG_FRAMEBUFFER, (%ebx)
jne .endScan
/* TODO: handle framebuffer tag */
.endScan:
add 4(%ebx), %ebx
dec %ecx
jnz .tableScan
/* Setup basic code and data segment selectors for Linux
**
** Flat code segment descriptor:
** selector: 0x10
** base : 0x00000000
** limit : 0xFFFFFFFF
** type : code, execute, read
**
** Flat data segment descriptor:
** selector: 0x18
** base : 0x00000000
** limit : 0xFFFFFFFF
** type : data, read/write
**
** Use TRAMPOLINE_ENTRY_LOC as a scratchpad.
*/
mov $TRAMPOLINE_ENTRY_LOC, %eax
movl $0x0000ffff, 16(%eax) // Set up the 2 new descriptors
movl $0x00cf9b00, 20(%eax)
movl $0x0000ffff, 24(%eax)
movl $0x00cf9300, 28(%eax)
movb $0x2b, 0(%eax) // Set the size
movl %eax, 2(%eax) // Set pointer to new GDT
lgdt (%eax) // Load it
/* finally: jump to kernel */
mov $LINUX_PARAM_LOC, %esi
jmp *(LINUX_PARAM_LOC + LINUX_ENTRY_OFFSET)
2:
hlt
jmp 2b
.trampoline_end:
|
