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
|
/*
* Generic Loader
*
* Copyright (C) 2014 Li Guang
* Copyright (C) 2016 Xilinx Inc.
* Written by Li Guang <lig.fnst@cn.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
/*
* Internally inside QEMU this is a device. It is a strange device that
* provides no hardware interface but allows QEMU to monkey patch memory
* specified when it is created. To be able to do this it has a reset
* callback that does the memory operations.
* This device allows the user to monkey patch memory. To be able to do
* this it needs a backend to manage the datas, the same as other
* memory-related devices. In this case as the backend is so trivial we
* have merged it with the frontend instead of creating and maintaining a
* separate backend.
*/
#include "qemu/osdep.h"
#include "hw/core/cpu.h"
#include "sysemu/dma.h"
#include "sysemu/reset.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/module.h"
#include "hw/core/generic-loader.h"
#define CPU_NONE 0xFFFFFFFF
static void generic_loader_reset(void *opaque)
{
GenericLoaderState *s = GENERIC_LOADER(opaque);
if (s->set_pc) {
CPUClass *cc = CPU_GET_CLASS(s->cpu);
cpu_reset(s->cpu);
if (cc) {
cc->set_pc(s->cpu, s->addr);
}
}
if (s->data_len) {
assert(s->data_len < sizeof(s->data));
dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len);
}
}
static void generic_loader_realize(DeviceState *dev, Error **errp)
{
GenericLoaderState *s = GENERIC_LOADER(dev);
hwaddr entry;
int big_endian;
int size = 0;
s->set_pc = false;
/* Perform some error checking on the user's options */
if (s->data || s->data_len || s->data_be) {
/* User is loading memory values */
if (s->file) {
error_setg(errp, "Specifying a file is not supported when loading "
"memory values");
return;
} else if (s->force_raw) {
error_setg(errp, "Specifying force-raw is not supported when "
"loading memory values");
return;
} else if (!s->data_len) {
/* We can't check for !data here as a value of 0 is still valid. */
error_setg(errp, "Both data and data-len must be specified");
return;
} else if (s->data_len > 8) {
error_setg(errp, "data-len cannot be greater then 8 bytes");
return;
}
} else if (s->file || s->force_raw) {
/* User is loading an image */
if (s->data || s->data_len || s->data_be) {
error_setg(errp, "data can not be specified when loading an "
"image");
return;
}
/* The user specified a file, only set the PC if they also specified
* a CPU to use.
*/
if (s->cpu_num != CPU_NONE) {
s->set_pc = true;
}
} else if (s->addr) {
/* User is setting the PC */
if (s->data || s->data_len || s->data_be) {
error_setg(errp, "data can not be specified when setting a "
"program counter");
return;
} else if (s->cpu_num == CPU_NONE) {
error_setg(errp, "cpu_num must be specified when setting a "
"program counter");
return;
}
s->set_pc = true;
} else {
/* Did the user specify anything? */
error_setg(errp, "please include valid arguments");
return;
}
qemu_register_reset(generic_loader_reset, dev);
if (s->cpu_num != CPU_NONE) {
s->cpu = qemu_get_cpu(s->cpu_num);
if (!s->cpu) {
error_setg(errp, "Specified boot CPU#%d is nonexistent",
s->cpu_num);
return;
}
} else {
s->cpu = first_cpu;
}
big_endian = target_words_bigendian();
if (s->file) {
AddressSpace *as = s->cpu ? s->cpu->as : NULL;
if (!s->force_raw) {
size = load_elf_as(s->file, NULL, NULL, NULL, &entry, NULL, NULL,
NULL, big_endian, 0, 0, 0, as);
if (size < 0) {
size = load_uimage_as(s->file, &entry, NULL, NULL, NULL, NULL,
as);
}
if (size < 0) {
size = load_targphys_hex_as(s->file, &entry, as);
}
}
if (size < 0 || s->force_raw) {
/* Default to the maximum size being the machine's ram size */
size = load_image_targphys_as(s->file, s->addr, current_machine->ram_size, as);
} else {
s->addr = entry;
}
if (size < 0) {
error_setg(errp, "Cannot load specified image %s", s->file);
return;
}
}
/* Convert the data endiannes */
if (s->data_be) {
s->data = cpu_to_be64(s->data);
} else {
s->data = cpu_to_le64(s->data);
}
}
static void generic_loader_unrealize(DeviceState *dev)
{
qemu_unregister_reset(generic_loader_reset, dev);
}
static Property generic_loader_props[] = {
DEFINE_PROP_UINT64("addr", GenericLoaderState, addr, 0),
DEFINE_PROP_UINT64("data", GenericLoaderState, data, 0),
DEFINE_PROP_UINT8("data-len", GenericLoaderState, data_len, 0),
DEFINE_PROP_BOOL("data-be", GenericLoaderState, data_be, false),
DEFINE_PROP_UINT32("cpu-num", GenericLoaderState, cpu_num, CPU_NONE),
DEFINE_PROP_BOOL("force-raw", GenericLoaderState, force_raw, false),
DEFINE_PROP_STRING("file", GenericLoaderState, file),
DEFINE_PROP_END_OF_LIST(),
};
static void generic_loader_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
/* The reset function is not registered here and is instead registered in
* the realize function to allow this device to be added via the device_add
* command in the QEMU monitor.
* TODO: Improve the device_add functionality to allow resets to be
* connected
*/
dc->realize = generic_loader_realize;
dc->unrealize = generic_loader_unrealize;
device_class_set_props(dc, generic_loader_props);
dc->desc = "Generic Loader";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
static TypeInfo generic_loader_info = {
.name = TYPE_GENERIC_LOADER,
.parent = TYPE_DEVICE,
.instance_size = sizeof(GenericLoaderState),
.class_init = generic_loader_class_init,
};
static void generic_loader_register_type(void)
{
type_register_static(&generic_loader_info);
}
type_init(generic_loader_register_type)
|
