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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
|
/*
* QEMU PC System Firmware
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2011-2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "sysemu/blockdev.h"
#include "qemu/error-report.h"
#include "hw/sysbus.h"
#include "hw/hw.h"
#include "hw/i386/pc.h"
#include "hw/boards.h"
#include "hw/loader.h"
#include "sysemu/sysemu.h"
#include "hw/block/flash.h"
#include "sysemu/kvm.h"
#define BIOS_FILENAME "bios.bin"
typedef struct PcSysFwDevice {
SysBusDevice busdev;
uint8_t rom_only;
uint8_t isapc_ram_fw;
} PcSysFwDevice;
static void pc_isa_bios_init(MemoryRegion *rom_memory,
MemoryRegion *flash_mem,
int ram_size)
{
int isa_bios_size;
MemoryRegion *isa_bios;
uint64_t flash_size;
void *flash_ptr, *isa_bios_ptr;
flash_size = memory_region_size(flash_mem);
/* map the last 128KB of the BIOS in ISA space */
isa_bios_size = flash_size;
if (isa_bios_size > (128 * 1024)) {
isa_bios_size = 128 * 1024;
}
isa_bios = g_malloc(sizeof(*isa_bios));
memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
vmstate_register_ram_global(isa_bios);
memory_region_add_subregion_overlap(rom_memory,
0x100000 - isa_bios_size,
isa_bios,
1);
/* copy ISA rom image from top of flash memory */
flash_ptr = memory_region_get_ram_ptr(flash_mem);
isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
memcpy(isa_bios_ptr,
((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
isa_bios_size);
memory_region_set_readonly(isa_bios, true);
}
static void pc_fw_add_pflash_drv(void)
{
QemuOpts *opts;
QEMUMachine *machine;
char *filename;
if (bios_name == NULL) {
bios_name = BIOS_FILENAME;
}
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
if (!filename) {
error_report("Can't open BIOS image %s", bios_name);
exit(1);
}
opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
g_free(filename);
if (opts == NULL) {
return;
}
machine = find_default_machine();
if (machine == NULL) {
return;
}
if (!drive_init(opts, machine->block_default_type)) {
qemu_opts_del(opts);
}
}
static void pc_system_flash_init(MemoryRegion *rom_memory,
DriveInfo *pflash_drv)
{
BlockDriverState *bdrv;
int64_t size;
hwaddr phys_addr;
int sector_bits, sector_size;
pflash_t *system_flash;
MemoryRegion *flash_mem;
bdrv = pflash_drv->bdrv;
size = bdrv_getlength(pflash_drv->bdrv);
sector_bits = 12;
sector_size = 1 << sector_bits;
if ((size % sector_size) != 0) {
fprintf(stderr,
"qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
sector_size);
exit(1);
}
phys_addr = 0x100000000ULL - size;
system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
bdrv, sector_size, size >> sector_bits,
1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
flash_mem = pflash_cfi01_get_memory(system_flash);
pc_isa_bios_init(rom_memory, flash_mem, size);
}
static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
{
char *filename;
MemoryRegion *bios, *isa_bios;
int bios_size, isa_bios_size;
int ret;
/* BIOS load */
if (bios_name == NULL) {
bios_name = BIOS_FILENAME;
}
filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
if (filename) {
bios_size = get_image_size(filename);
} else {
bios_size = -1;
}
if (bios_size <= 0 ||
(bios_size % 65536) != 0) {
goto bios_error;
}
bios = g_malloc(sizeof(*bios));
memory_region_init_ram(bios, "pc.bios", bios_size);
vmstate_register_ram_global(bios);
if (!isapc_ram_fw) {
memory_region_set_readonly(bios, true);
}
ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
if (ret != 0) {
bios_error:
fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
exit(1);
}
if (filename) {
g_free(filename);
}
/* map the last 128KB of the BIOS in ISA space */
isa_bios_size = bios_size;
if (isa_bios_size > (128 * 1024)) {
isa_bios_size = 128 * 1024;
}
isa_bios = g_malloc(sizeof(*isa_bios));
memory_region_init_alias(isa_bios, "isa-bios", bios,
bios_size - isa_bios_size, isa_bios_size);
memory_region_add_subregion_overlap(rom_memory,
0x100000 - isa_bios_size,
isa_bios,
1);
if (!isapc_ram_fw) {
memory_region_set_readonly(isa_bios, true);
}
/* map all the bios at the top of memory */
memory_region_add_subregion(rom_memory,
(uint32_t)(-bios_size),
bios);
}
/*
* Bug-compatible flash vs. ROM selection enabled?
* A few older machines enable this.
*/
bool pc_sysfw_flash_vs_rom_bug_compatible;
void pc_system_firmware_init(MemoryRegion *rom_memory)
{
DriveInfo *pflash_drv;
PcSysFwDevice *sysfw_dev;
/*
* TODO This device exists only so that users can switch between
* use of flash and ROM for the BIOS. The ability to switch was
* created because flash doesn't work with KVM. Once it does, we
* should drop this device.
*/
sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
qdev_init_nofail(DEVICE(sysfw_dev));
pflash_drv = drive_get(IF_PFLASH, 0, 0);
if (pc_sysfw_flash_vs_rom_bug_compatible) {
/*
* This is a Bad Idea, because it makes enabling/disabling KVM
* guest-visible. Do it only in bug-compatibility mode.
*/
if (kvm_enabled()) {
if (pflash_drv != NULL) {
fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
exit(1);
} else {
/* In old pc_sysfw_flash_vs_rom_bug_compatible mode, we assume
* that KVM cannot execute from device memory. In this case, we
* use old rom based firmware initialization for KVM. But, since
* this is different from non-kvm mode, this behavior is
* undesirable */
sysfw_dev->rom_only = 1;
}
}
} else if (pflash_drv == NULL) {
/* When a pflash drive is not found, use rom-mode */
sysfw_dev->rom_only = 1;
} else if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
/* Older KVM cannot execute from device memory. So, flash memory
* cannot be used unless the readonly memory kvm capability is present. */
fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
exit(1);
}
/* If rom-mode is active, use the old pc system rom initialization. */
if (sysfw_dev->rom_only) {
old_pc_system_rom_init(rom_memory, sysfw_dev->isapc_ram_fw);
return;
}
/* If a pflash drive is not found, then create one using
the bios filename. */
if (pflash_drv == NULL) {
pc_fw_add_pflash_drv();
pflash_drv = drive_get(IF_PFLASH, 0, 0);
}
if (pflash_drv != NULL) {
pc_system_flash_init(rom_memory, pflash_drv);
} else {
fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
exit(1);
}
}
static Property pcsysfw_properties[] = {
DEFINE_PROP_UINT8("isapc_ram_fw", PcSysFwDevice, isapc_ram_fw, 0),
DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 0),
DEFINE_PROP_END_OF_LIST(),
};
static int pcsysfw_init(DeviceState *dev)
{
return 0;
}
static void pcsysfw_class_init (ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS (klass);
dc->desc = "PC System Firmware";
dc->init = pcsysfw_init;
dc->props = pcsysfw_properties;
}
static const TypeInfo pcsysfw_info = {
.name = "pc-sysfw",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof (PcSysFwDevice),
.class_init = pcsysfw_class_init,
};
static void pcsysfw_register (void)
{
type_register_static (&pcsysfw_info);
}
type_init (pcsysfw_register);
|