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1.1 root 1:
2: #include <mach/machine/asm.h>
3:
1.1.1.2 root 4: #include <i386/i386asm.h>
1.1 root 5:
1.1.1.2 root 6: /*
7: * This section will be put first into .text. See also i386/ldscript.
8: */
9: .section .text.start,"ax"
10:
1.1 root 11: /* We should never be entered this way. */
12: .globl start,_start
13: start:
14: _start:
15: jmp boot_entry
16:
17: /* MultiBoot header - see multiboot.h. */
18: #define MULTIBOOT_MAGIC 0x1BADB002
19: #ifdef __ELF__
1.1.1.3 ! root 20: #define MULTIBOOT_FLAGS 0x00000003
1.1 root 21: #else /* __ELF__ */
1.1.1.3 ! root 22: #define MULTIBOOT_FLAGS 0x00010003
1.1 root 23: #endif /* __ELF__ */
24: P2ALIGN(2)
25: boot_hdr:
26: .long MULTIBOOT_MAGIC
27: .long MULTIBOOT_FLAGS
28: /*
29: * The next item here is the checksum.
30: * XX this works OK until we need at least the 30th bit.
31: */
32: .long - (MULTIBOOT_MAGIC+MULTIBOOT_FLAGS)
33: #ifndef __ELF__ /* a.out kludge */
34: .long boot_hdr /* header_addr */
35: .long _start /* load_addr */
36: .long _edata /* load_end_addr */
37: .long _end /* bss_end_addr */
38: .long boot_entry /* entry */
39: #endif /* __ELF__ */
40:
41: boot_entry:
1.1.1.2 root 42: /* use segmentation to offset ourself. */
43: lgdt boot_gdt_descr - KERNELBASE
44: ljmp $8,$0f
45: 0:
46: movw $0,%ax
47: movw %ax,%ds
48: movw %ax,%es
49: movw %ax,%fs
50: movw %ax,%gs
51: movw $16,%ax
52: movw %ax,%ds
53: movw %ax,%es
54: movw %ax,%ss
1.1 root 55:
56: /* Switch to our own interrupt stack. */
57: movl $_intstack+INTSTACK_SIZE,%esp
58:
59: /* Reset EFLAGS to a known state. */
60: pushl $0
61: popf
62:
63: /* Clear uninitialized data. */
64: lea _edata,%edi
65: lea _end,%ecx
66: subl %edi,%ecx
67: xorl %eax,%eax
68: rep
69: stosb
70:
71: /* Push the boot_info pointer to be the second argument. */
72: pushl %ebx
73:
1.1.1.2 root 74: /* Fix ifunc entries */
75: movl $__rel_iplt_start,%esi
76: movl $__rel_iplt_end,%edi
77: iplt_cont:
78: cmpl %edi,%esi
79: jae iplt_done
80: movl (%esi),%ebx /* r_offset */
81: movb 4(%esi),%al /* info */
82: cmpb $42,%al /* IRELATIVE */
83: jnz iplt_next
84: call *(%ebx) /* call ifunc */
85: movl %eax,(%ebx) /* fixed address */
86: iplt_next:
87: addl $8,%esi
88: jmp iplt_cont
89: iplt_done:
90:
1.1 root 91: /* Jump into C code. */
92: call EXT(c_boot_entry)
93:
94: .comm _intstack,INTSTACK_SIZE
95:
1.1.1.2 root 96: .align 16
97: .word 0
98: boot_gdt_descr:
99: .word 3*8+7
100: .long boot_gdt - KERNELBASE
101: .align 16
102: boot_gdt:
103: /* 0 */
104: .quad 0
105: /* boot CS = 8 */
106: .word 0xffff
107: .word (-KERNELBASE) & 0xffff
108: .byte ((-KERNELBASE) >> 16) & 0xff
109: .byte 0x9a
110: .byte 0xcf
111: .byte ((-KERNELBASE) >> 24) & 0xff
112: /* boot DS = 8 */
113: .word 0xffff
114: .word (-KERNELBASE) & 0xffff
115: .byte ((-KERNELBASE) >> 16) & 0xff
116: .byte 0x92
117: .byte 0xcf
118: .byte ((-KERNELBASE) >> 24) & 0xff
119:
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