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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* linux/arch/x86_64/kernel/head.S -- start in 32bit and switch to 64bit
*
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
* Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
* Copyright (C) 2000 Karsten Keil <kkeil@suse.de>
* Copyright (C) 2001,2002 Andi Kleen <ak@suse.de>
*
* $Id: head.S,v 1.49 2002/03/19 17:39:25 ak Exp $
*
* Jun Nakajima <jun.nakajima@intel.com>
* Modified for Xen
*/
#include <linux/linkage.h>
#include <linux/threads.h>
#include <linux/init.h>
#include <linux/elfnote.h>
#include <asm/desc.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/msr.h>
#include <asm/cache.h>
#include <xen/interface/elfnote.h>
.text
.code64
#define VIRT_ENTRY_OFFSET 0x0
.org VIRT_ENTRY_OFFSET
.globl startup_64
startup_64:
ENTRY(_start)
movq $(init_thread_union+THREAD_SIZE-8),%rsp
/* zero EFLAGS after setting rsp */
pushq $0
popfq
/* rsi is pointer to startup info structure.
pass it to C */
movq %rsi,%rdi
jmp x86_64_start_kernel
ENTRY(stext)
ENTRY(_stext)
$page = 0
#define NEXT_PAGE(name) \
$page = $page + 1; \
.org $page * 0x1000; \
phys_/**/name = $page * 0x1000 + __PHYSICAL_START; \
ENTRY(name)
NEXT_PAGE(init_level4_pgt)
/* This gets initialized in x86_64_start_kernel */
.fill 512,8,0
/*
* We update two pgd entries to make kernel and user pgd consistent
* at pgd_populate(). It can be used for kernel modules. So we place
* this page here for those cases to avoid memory corruption.
* We also use this page to establish the initiali mapping for
* vsyscall area.
*/
NEXT_PAGE(init_level4_user_pgt)
.fill 512,8,0
NEXT_PAGE(level3_kernel_pgt)
.fill 512,8,0
/*
* This is used for vsyscall area mapping as we have a different
* level4 page table for user.
*/
NEXT_PAGE(level3_user_pgt)
.fill 512,8,0
NEXT_PAGE(level2_kernel_pgt)
.fill 512,8,0
NEXT_PAGE(hypercall_page)
.fill 512,8,0
#undef NEXT_PAGE
.data
.align 16
.globl cpu_gdt_descr
cpu_gdt_descr:
.word gdt_end-cpu_gdt_table-1
gdt:
.quad cpu_gdt_table
#ifdef CONFIG_SMP
.rept NR_CPUS-1
.word 0
.quad 0
.endr
#endif
/* We need valid kernel segments for data and code in long mode too
* IRET will check the segment types kkeil 2000/10/28
* Also sysret mandates a special GDT layout
*/
.section .data.page_aligned, "aw"
.align PAGE_SIZE
/* The TLS descriptors are currently at a different place compared to i386.
Hopefully nobody expects them at a fixed place (Wine?) */
ENTRY(cpu_gdt_table)
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x0 /* unused */
.quad 0x00af9a000000ffff /* __KERNEL_CS */
.quad 0x00cf92000000ffff /* __KERNEL_DS */
.quad 0x00cffa000000ffff /* __USER32_CS */
.quad 0x00cff2000000ffff /* __USER_DS, __USER32_DS */
.quad 0x00affa000000ffff /* __USER_CS */
.quad 0x00cf9a000000ffff /* __KERNEL32_CS */
.quad 0,0 /* TSS */
.quad 0,0 /* LDT */
.quad 0,0,0 /* three TLS descriptors */
.quad 0 /* unused */
gdt_end:
/* asm/segment.h:GDT_ENTRIES must match this */
/* This should be a multiple of the cache line size */
/* GDTs of other CPUs are now dynamically allocated */
/* zero the remaining page */
.fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
.section .bss.page_aligned, "aw", @nobits
.align PAGE_SIZE
ENTRY(empty_zero_page)
.skip PAGE_SIZE
#ifdef CONFIG_XEN_COMPAT_030002
/*
* __xen_guest information
*/
.macro utoh value
.if (\value) < 0 || (\value) >= 0x10
utoh (((\value)>>4)&0x0fffffffffffffff)
.endif
.if ((\value) & 0xf) < 10
.byte '0' + ((\value) & 0xf)
.else
.byte 'A' + ((\value) & 0xf) - 10
.endif
.endm
.section __xen_guest
.ascii "GUEST_OS=linux,GUEST_VER=2.6"
.ascii ",XEN_VER=xen-3.0"
.ascii ",VIRT_BASE=0x"
utoh __START_KERNEL_map
.ascii ",ELF_PADDR_OFFSET=0x"
utoh __START_KERNEL_map
.ascii ",VIRT_ENTRY=0x"
utoh (__START_KERNEL_map + __PHYSICAL_START + VIRT_ENTRY_OFFSET)
.ascii ",HYPERCALL_PAGE=0x"
utoh (phys_hypercall_page >> PAGE_SHIFT)
.ascii ",FEATURES=writable_page_tables"
.ascii "|writable_descriptor_tables"
.ascii "|auto_translated_physmap"
.ascii "|supervisor_mode_kernel"
.ascii ",LOADER=generic"
.byte 0
#endif /* CONFIG_XEN_COMPAT_030002 */
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "linux")
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, "2.6")
ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0")
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .quad, __START_KERNEL_map)
#ifdef CONFIG_XEN_COMPAT_030002
ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, __START_KERNEL_map)
#else
ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .quad, 0)
#endif /* !CONFIG_XEN_COMPAT_030002 */
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .quad, startup_64)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .quad, hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")
|
