blob: de807538af22cd50f388bfa5bba641fcf1c1a9d5 (
plain)
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
|
#include <mach/machine/asm.h>
#include "i386asm.h"
.text
/* We should never be entered this way. */
.globl start,_start
start:
_start:
jmp boot_entry
/* MultiBoot header - see multiboot.h. */
#define MULTIBOOT_MAGIC 0x1BADB002
#ifdef __ELF__
#define MULTIBOOT_FLAGS 0x00000002
#else /* __ELF__ */
#define MULTIBOOT_FLAGS 0x00010002
#endif /* __ELF__ */
P2ALIGN(2)
boot_hdr:
.long MULTIBOOT_MAGIC
.long MULTIBOOT_FLAGS
/*
* The next item here is the checksum.
* XX this works OK until we need at least the 30th bit.
*/
.long - (MULTIBOOT_MAGIC+MULTIBOOT_FLAGS)
#ifndef __ELF__ /* a.out kludge */
.long boot_hdr /* header_addr */
.long _start /* load_addr */
.long _edata /* load_end_addr */
.long _end /* bss_end_addr */
.long boot_entry /* entry */
#endif /* __ELF__ */
boot_entry:
/* Switch to our own interrupt stack. */
movl $_intstack+INTSTACK_SIZE,%esp
/* Reset EFLAGS to a known state. */
pushl $0
popf
/* Clear uninitialized data. */
lea _edata,%edi
lea _end,%ecx
subl %edi,%ecx
xorl %eax,%eax
rep
stosb
/* Push the boot_info pointer to be the second argument. */
pushl %ebx
/* Jump into C code. */
call EXT(c_boot_entry)
.comm _intstack,INTSTACK_SIZE
|
