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
186
187
188
189
190
|
/*-
* Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
* Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
* Copyright (c) 2008-2009 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <machine/asmacros.h>
#include <machine/specialreg.h>
#include "acpi_wakedata.h"
#include "assym.s"
#define WAKEUP_DECL(member) \
.set WAKEUP_ ## member, wakeup_ ## member - wakeup_ctx
WAKEUP_DECL(xpcb)
WAKEUP_DECL(gdt)
WAKEUP_DECL(efer)
WAKEUP_DECL(pat)
WAKEUP_DECL(star)
WAKEUP_DECL(lstar)
WAKEUP_DECL(cstar)
WAKEUP_DECL(sfmask)
WAKEUP_DECL(cpu)
#define WAKEUP_CTX(member) WAKEUP_ ## member (%rdi)
#define WAKEUP_PCB(member) PCB_ ## member(%r11)
#define WAKEUP_XPCB(member) XPCB_ ## member(%r11)
ENTRY(acpi_restorecpu)
/* Switch to KPML4phys. */
movq %rsi, %rax
movq %rax, %cr3
/* Restore GDT. */
lgdt WAKEUP_CTX(gdt)
jmp 1f
1:
/* Fetch PCB. */
movq WAKEUP_CTX(xpcb), %r11
/* Force kernel segment registers. */
movl $KDSEL, %eax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movl $KUF32SEL, %eax
movw %ax, %fs
movl $KUG32SEL, %eax
movw %ax, %gs
movl $MSR_FSBASE, %ecx
movl WAKEUP_PCB(FSBASE), %eax
movl 4 + WAKEUP_PCB(FSBASE), %edx
wrmsr
movl $MSR_GSBASE, %ecx
movl WAKEUP_PCB(GSBASE), %eax
movl 4 + WAKEUP_PCB(GSBASE), %edx
wrmsr
movl $MSR_KGSBASE, %ecx
movl WAKEUP_XPCB(KGSBASE), %eax
movl 4 + WAKEUP_XPCB(KGSBASE), %edx
wrmsr
/* Restore EFER. */
movl $MSR_EFER, %ecx
movl WAKEUP_CTX(efer), %eax
wrmsr
/* Restore PAT. */
movl $MSR_PAT, %ecx
movl WAKEUP_CTX(pat), %eax
movl 4 + WAKEUP_CTX(pat), %edx
wrmsr
/* Restore fast syscall stuff. */
movl $MSR_STAR, %ecx
movl WAKEUP_CTX(star), %eax
movl 4 + WAKEUP_CTX(star), %edx
wrmsr
movl $MSR_LSTAR, %ecx
movl WAKEUP_CTX(lstar), %eax
movl 4 + WAKEUP_CTX(lstar), %edx
wrmsr
movl $MSR_CSTAR, %ecx
movl WAKEUP_CTX(cstar), %eax
movl 4 + WAKEUP_CTX(cstar), %edx
wrmsr
movl $MSR_SF_MASK, %ecx
movl WAKEUP_CTX(sfmask), %eax
wrmsr
/* Restore CR0, CR2 and CR4. */
movq WAKEUP_XPCB(CR0), %rax
movq %rax, %cr0
movq WAKEUP_XPCB(CR2), %rax
movq %rax, %cr2
movq WAKEUP_XPCB(CR4), %rax
movq %rax, %cr4
/* Restore descriptor tables. */
lidt WAKEUP_XPCB(IDT)
lldt WAKEUP_XPCB(LDT)
#define SDT_SYSTSS 9
#define SDT_SYSBSY 11
/* Clear "task busy" bit and reload TR. */
movq PCPU(TSS), %rax
andb $(~SDT_SYSBSY | SDT_SYSTSS), 5(%rax)
movw WAKEUP_XPCB(TR), %ax
ltr %ax
#undef SDT_SYSTSS
#undef SDT_SYSBSY
/* Restore other callee saved registers. */
movq WAKEUP_PCB(R15), %r15
movq WAKEUP_PCB(R14), %r14
movq WAKEUP_PCB(R13), %r13
movq WAKEUP_PCB(R12), %r12
movq WAKEUP_PCB(RBP), %rbp
movq WAKEUP_PCB(RSP), %rsp
movq WAKEUP_PCB(RBX), %rbx
/* Restore debug registers. */
movq WAKEUP_PCB(DR0), %rax
movq %rax, %dr0
movq WAKEUP_PCB(DR1), %rax
movq %rax, %dr1
movq WAKEUP_PCB(DR2), %rax
movq %rax, %dr2
movq WAKEUP_PCB(DR3), %rax
movq %rax, %dr3
movq WAKEUP_PCB(DR6), %rax
movq %rax, %dr6
movq WAKEUP_PCB(DR7), %rax
movq %rax, %dr7
/* Restore return address. */
movq WAKEUP_PCB(RIP), %rax
movq %rax, (%rsp)
/* Indicate the CPU is resumed. */
xorl %eax, %eax
movl %eax, WAKEUP_CTX(cpu)
ret
END(acpi_restorecpu)
ENTRY(acpi_savecpu)
/* Fetch XPCB and save CPU context. */
movq %rdi, %r10
call savectx2
movq %r10, %r11
/* Patch caller's return address and stack pointer. */
movq (%rsp), %rax
movq %rax, WAKEUP_PCB(RIP)
movq %rsp, %rax
movq %rax, WAKEUP_PCB(RSP)
movl $1, %eax
ret
END(acpi_savecpu)
|