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1 | /* | |
2 | * QEMU PC System Firmware | |
3 | * | |
4 | * Copyright (c) 2003-2004 Fabrice Bellard | |
5 | * Copyright (c) 2011-2012 Intel Corporation | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include "qemu/osdep.h" | |
27 | #include "qapi/error.h" | |
28 | #include "sysemu/block-backend.h" | |
29 | #include "qemu/error-report.h" | |
30 | #include "qemu/option.h" | |
31 | #include "qemu/units.h" | |
32 | #include "hw/sysbus.h" | |
33 | #include "hw/i386/x86.h" | |
34 | #include "hw/i386/pc.h" | |
35 | #include "hw/loader.h" | |
36 | #include "hw/qdev-properties.h" | |
37 | #include "hw/block/flash.h" | |
38 | #include "sysemu/kvm.h" | |
39 | #include "sev.h" | |
40 | ||
41 | #define FLASH_SECTOR_SIZE 4096 | |
42 | ||
43 | static void pc_isa_bios_init(MemoryRegion *isa_bios, MemoryRegion *rom_memory, | |
44 | MemoryRegion *flash_mem) | |
45 | { | |
46 | int isa_bios_size; | |
47 | uint64_t flash_size; | |
48 | void *flash_ptr, *isa_bios_ptr; | |
49 | ||
50 | flash_size = memory_region_size(flash_mem); | |
51 | ||
52 | /* map the last 128KB of the BIOS in ISA space */ | |
53 | isa_bios_size = MIN(flash_size, 128 * KiB); | |
54 | memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, | |
55 | &error_fatal); | |
56 | memory_region_add_subregion_overlap(rom_memory, | |
57 | 0x100000 - isa_bios_size, | |
58 | isa_bios, | |
59 | 1); | |
60 | ||
61 | /* copy ISA rom image from top of flash memory */ | |
62 | flash_ptr = memory_region_get_ram_ptr(flash_mem); | |
63 | isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); | |
64 | memcpy(isa_bios_ptr, | |
65 | ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), | |
66 | isa_bios_size); | |
67 | ||
68 | memory_region_set_readonly(isa_bios, true); | |
69 | } | |
70 | ||
71 | static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, | |
72 | const char *name, | |
73 | const char *alias_prop_name) | |
74 | { | |
75 | DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01); | |
76 | ||
77 | qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE); | |
78 | qdev_prop_set_uint8(dev, "width", 1); | |
79 | qdev_prop_set_string(dev, "name", name); | |
80 | object_property_add_child(OBJECT(pcms), name, OBJECT(dev)); | |
81 | object_property_add_alias(OBJECT(pcms), alias_prop_name, | |
82 | OBJECT(dev), "drive"); | |
83 | /* | |
84 | * The returned reference is tied to the child property and | |
85 | * will be removed with object_unparent. | |
86 | */ | |
87 | object_unref(OBJECT(dev)); | |
88 | return PFLASH_CFI01(dev); | |
89 | } | |
90 | ||
91 | void pc_system_flash_create(PCMachineState *pcms) | |
92 | { | |
93 | PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); | |
94 | ||
95 | if (pcmc->pci_enabled) { | |
96 | pcms->flash[0] = pc_pflash_create(pcms, "system.flash0", | |
97 | "pflash0"); | |
98 | pcms->flash[1] = pc_pflash_create(pcms, "system.flash1", | |
99 | "pflash1"); | |
100 | } | |
101 | } | |
102 | ||
103 | void pc_system_flash_cleanup_unused(PCMachineState *pcms) | |
104 | { | |
105 | char *prop_name; | |
106 | int i; | |
107 | ||
108 | assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); | |
109 | ||
110 | for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { | |
111 | if (!qdev_is_realized(DEVICE(pcms->flash[i]))) { | |
112 | prop_name = g_strdup_printf("pflash%d", i); | |
113 | object_property_del(OBJECT(pcms), prop_name); | |
114 | g_free(prop_name); | |
115 | object_unparent(OBJECT(pcms->flash[i])); | |
116 | pcms->flash[i] = NULL; | |
117 | } | |
118 | } | |
119 | } | |
120 | ||
121 | /* | |
122 | * Map the pcms->flash[] from 4GiB downward, and realize. | |
123 | * Map them in descending order, i.e. pcms->flash[0] at the top, | |
124 | * without gaps. | |
125 | * Stop at the first pcms->flash[0] lacking a block backend. | |
126 | * Set each flash's size from its block backend. Fatal error if the | |
127 | * size isn't a non-zero multiple of 4KiB, or the total size exceeds | |
128 | * pcms->max_fw_size. | |
129 | * | |
130 | * If pcms->flash[0] has a block backend, its memory is passed to | |
131 | * pc_isa_bios_init(). Merging several flash devices for isa-bios is | |
132 | * not supported. | |
133 | */ | |
134 | static void pc_system_flash_map(PCMachineState *pcms, | |
135 | MemoryRegion *rom_memory) | |
136 | { | |
137 | X86MachineState *x86ms = X86_MACHINE(pcms); | |
138 | hwaddr total_size = 0; | |
139 | int i; | |
140 | BlockBackend *blk; | |
141 | int64_t size; | |
142 | PFlashCFI01 *system_flash; | |
143 | MemoryRegion *flash_mem; | |
144 | void *flash_ptr; | |
145 | int flash_size; | |
146 | ||
147 | assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled); | |
148 | ||
149 | for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { | |
150 | system_flash = pcms->flash[i]; | |
151 | blk = pflash_cfi01_get_blk(system_flash); | |
152 | if (!blk) { | |
153 | break; | |
154 | } | |
155 | size = blk_getlength(blk); | |
156 | if (size < 0) { | |
157 | error_report("can't get size of block device %s: %s", | |
158 | blk_name(blk), strerror(-size)); | |
159 | exit(1); | |
160 | } | |
161 | if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) { | |
162 | error_report("system firmware block device %s has invalid size " | |
163 | "%" PRId64, | |
164 | blk_name(blk), size); | |
165 | info_report("its size must be a non-zero multiple of 0x%x", | |
166 | FLASH_SECTOR_SIZE); | |
167 | exit(1); | |
168 | } | |
169 | if ((hwaddr)size != size | |
170 | || total_size > HWADDR_MAX - size | |
171 | || total_size + size > pcms->max_fw_size) { | |
172 | error_report("combined size of system firmware exceeds " | |
173 | "%" PRIu64 " bytes", | |
174 | pcms->max_fw_size); | |
175 | exit(1); | |
176 | } | |
177 | ||
178 | total_size += size; | |
179 | qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks", | |
180 | size / FLASH_SECTOR_SIZE); | |
181 | sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal); | |
182 | sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0, | |
183 | 0x100000000ULL - total_size); | |
184 | ||
185 | if (i == 0) { | |
186 | flash_mem = pflash_cfi01_get_memory(system_flash); | |
187 | pc_isa_bios_init(&x86ms->isa_bios, rom_memory, flash_mem); | |
188 | ||
189 | /* Encrypt the pflash boot ROM */ | |
190 | if (sev_enabled()) { | |
191 | flash_ptr = memory_region_get_ram_ptr(flash_mem); | |
192 | flash_size = memory_region_size(flash_mem); | |
193 | x86_firmware_configure(flash_ptr, flash_size); | |
194 | } | |
195 | } | |
196 | } | |
197 | } | |
198 | ||
199 | void pc_system_firmware_init(PCMachineState *pcms, | |
200 | MemoryRegion *rom_memory) | |
201 | { | |
202 | PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); | |
203 | int i; | |
204 | BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)]; | |
205 | ||
206 | if (!pcmc->pci_enabled) { | |
207 | x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, true); | |
208 | return; | |
209 | } | |
210 | ||
211 | /* Map legacy -drive if=pflash to machine properties */ | |
212 | for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) { | |
213 | pflash_cfi01_legacy_drive(pcms->flash[i], | |
214 | drive_get(IF_PFLASH, 0, i)); | |
215 | pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]); | |
216 | } | |
217 | ||
218 | /* Reject gaps */ | |
219 | for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) { | |
220 | if (pflash_blk[i] && !pflash_blk[i - 1]) { | |
221 | error_report("pflash%d requires pflash%d", i, i - 1); | |
222 | exit(1); | |
223 | } | |
224 | } | |
225 | ||
226 | if (!pflash_blk[0]) { | |
227 | /* Machine property pflash0 not set, use ROM mode */ | |
228 | x86_bios_rom_init(X86_MACHINE(pcms), "bios.bin", rom_memory, false); | |
229 | } else { | |
230 | if (kvm_enabled() && !kvm_readonly_mem_enabled()) { | |
231 | /* | |
232 | * Older KVM cannot execute from device memory. So, flash | |
233 | * memory cannot be used unless the readonly memory kvm | |
234 | * capability is present. | |
235 | */ | |
236 | error_report("pflash with kvm requires KVM readonly memory support"); | |
237 | exit(1); | |
238 | } | |
239 | ||
240 | pc_system_flash_map(pcms, rom_memory); | |
241 | } | |
242 | ||
243 | pc_system_flash_cleanup_unused(pcms); | |
244 | } | |
245 | ||
246 | void x86_firmware_configure(void *ptr, int size) | |
247 | { | |
248 | int ret; | |
249 | ||
250 | /* | |
251 | * OVMF places a GUIDed structures in the flash, so | |
252 | * search for them | |
253 | */ | |
254 | pc_system_parse_ovmf_flash(ptr, size); | |
255 | ||
256 | if (sev_enabled()) { | |
257 | ret = sev_es_save_reset_vector(ptr, size); | |
258 | if (ret) { | |
259 | error_report("failed to locate and/or save reset vector"); | |
260 | exit(1); | |
261 | } | |
262 | ||
263 | sev_encrypt_flash(ptr, size, &error_fatal); | |
264 | } | |
265 | } |