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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*++ @file
POSIX Pthreads to emulate APs and implement threads
Copyright (c) 2011, Apple Inc. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "SecMain.h"
#include <pthread.h>
UINTN
EFIAPI
PthreadMutexLock (
IN VOID *Mutex
)
{
return (UINTN)pthread_mutex_lock ((pthread_mutex_t *)Mutex);
}
UINTN
EFIAPI
PthreadMutexUnLock (
IN VOID *Mutex
)
{
return (UINTN)pthread_mutex_unlock ((pthread_mutex_t *)Mutex);
}
UINTN
EFIAPI
PthreadMutexTryLock (
IN VOID *Mutex
)
{
return (UINTN)pthread_mutex_trylock ((pthread_mutex_t *)Mutex);
}
VOID *
PthreadMutexInit (
IN VOID
)
{
pthread_mutex_t *Mutex;
int err;
Mutex = malloc (sizeof (pthread_mutex_t));
err = pthread_mutex_init (Mutex, NULL);
if (err == 0) {
return Mutex;
}
return NULL;
}
UINTN
PthreadMutexDestroy (
IN VOID *Mutex
)
{
if (Mutex != NULL) {
return pthread_mutex_destroy ((pthread_mutex_t *)Mutex);
}
return -1;
}
// Can't store this data on PthreadCreate stack so we need a global
typedef struct {
pthread_mutex_t Mutex;
PTREAD_THUNK_THEAD_ENTRY Start;
} THREAD_MANGLE;
THREAD_MANGLE mThreadMangle = {
PTHREAD_MUTEX_INITIALIZER,
NULL
};
VOID *
SecFakePthreadStart (
VOID *Context
)
{
PTREAD_THUNK_THEAD_ENTRY Start;
sigset_t SigMask;
// Save global on the stack before we unlock
Start = mThreadMangle.Start;
pthread_mutex_unlock (&mThreadMangle.Mutex);
// Mask all signals to the APs
sigfillset (&SigMask);
pthread_sigmask (SIG_BLOCK, &SigMask, NULL);
//
// We have to start the thread in SEC as we need to follow
// OS X calling conventions. We can then call back into
// to the callers Start.
//
// This is a great example of how all problems in computer
// science can be solved by adding another level of indirection
//
return (VOID *)ReverseGasketUint64 ((CALL_BACK)Start, (UINTN)Context);
}
UINTN
PthreadCreate (
IN VOID *Thread,
IN VOID *Attribute,
IN PTREAD_THUNK_THEAD_ENTRY Start,
IN VOID *Context
)
{
int err;
BOOLEAN EnabledOnEntry;
//
// Threads inherit interrupt state so disable interrupts before we start thread
//
if (SecInterruptEanbled ()) {
SecDisableInterrupt ();
EnabledOnEntry = TRUE;
} else {
EnabledOnEntry = FALSE;
}
// Aquire lock for global, SecFakePthreadStart runs in a different thread.
pthread_mutex_lock (&mThreadMangle.Mutex);
mThreadMangle.Start = Start;
err = pthread_create (Thread, Attribute, SecFakePthreadStart, Context);
if (err != 0) {
// Thread failed to launch so release the lock;
pthread_mutex_unlock (&mThreadMangle.Mutex);
}
if (EnabledOnEntry) {
// Restore interrupt state
SecEnableInterrupt ();
}
return err;
}
VOID
PthreadExit (
IN VOID *ValuePtr
)
{
pthread_exit (ValuePtr);
return;
}
UINTN
PthreadSelf (
VOID
)
{
// POSIX currently allows pthread_t to be a structure or arithmetic type.
// Check out sys/types.h to make sure this will work if you are porting.
// On OS X (Darwin) pthread_t is a pointer to a structure so this code works.
return (UINTN)pthread_self ();
}
EMU_PTREAD_THUNK_PROTOCOL gPthreadThunk = {
GasketPthreadMutexLock,
GasketPthreadMutexUnLock,
GasketPthreadMutexTryLock,
GasketPthreadMutexInit,
GasketPthreadMutexDestroy,
GasketPthreadCreate,
GasketPthreadExit,
GasketPthreadSelf
};
EFI_STATUS
PthreadOpen (
IN EMU_IO_THUNK_PROTOCOL *This
)
{
if (This->Instance != 0) {
// Only single instance is supported
return EFI_NOT_FOUND;
}
if (This->ConfigString[0] == L'0') {
// If AP count is zero no need for threads
return EFI_NOT_FOUND;
}
This->Interface = &gPthreadThunk;
return EFI_SUCCESS;
}
EFI_STATUS
PthreadClose (
IN EMU_IO_THUNK_PROTOCOL *This
)
{
return EFI_SUCCESS;
}
EMU_IO_THUNK_PROTOCOL gPthreadThunkIo = {
&gEmuPthreadThunkProtocolGuid,
NULL,
NULL,
0,
GasketPthreadOpen,
GasketPthreadClose,
NULL
};
|
