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26#include "qemu/osdep.h"
27#include "qapi/error.h"
28#include "sysemu/block-backend.h"
29#include "qemu/error-report.h"
30#include "hw/sysbus.h"
31#include "hw/hw.h"
32#include "hw/i386/pc.h"
33#include "hw/boards.h"
34#include "hw/loader.h"
35#include "sysemu/sysemu.h"
36#include "hw/block/flash.h"
37#include "sysemu/kvm.h"
38
39#define BIOS_FILENAME "bios.bin"
40
41typedef struct PcSysFwDevice {
42 SysBusDevice busdev;
43 uint8_t isapc_ram_fw;
44} PcSysFwDevice;
45
46static void pc_isa_bios_init(MemoryRegion *rom_memory,
47 MemoryRegion *flash_mem,
48 int ram_size)
49{
50 int isa_bios_size;
51 MemoryRegion *isa_bios;
52 uint64_t flash_size;
53 void *flash_ptr, *isa_bios_ptr;
54
55 flash_size = memory_region_size(flash_mem);
56
57
58 isa_bios_size = MIN(flash_size, 128 * 1024);
59 isa_bios = g_malloc(sizeof(*isa_bios));
60 memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
61 &error_fatal);
62 vmstate_register_ram_global(isa_bios);
63 memory_region_add_subregion_overlap(rom_memory,
64 0x100000 - isa_bios_size,
65 isa_bios,
66 1);
67
68
69 flash_ptr = memory_region_get_ram_ptr(flash_mem);
70 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
71 memcpy(isa_bios_ptr,
72 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
73 isa_bios_size);
74
75 memory_region_set_readonly(isa_bios, true);
76}
77
78#define FLASH_MAP_UNIT_MAX 2
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84
85
86#define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
87
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103
104static void pc_system_flash_init(MemoryRegion *rom_memory)
105{
106 int unit;
107 DriveInfo *pflash_drv;
108 BlockBackend *blk;
109 int64_t size;
110 char *fatal_errmsg = NULL;
111 hwaddr phys_addr = 0x100000000ULL;
112 int sector_bits, sector_size;
113 pflash_t *system_flash;
114 MemoryRegion *flash_mem;
115 char name[64];
116
117 sector_bits = 12;
118 sector_size = 1 << sector_bits;
119
120 for (unit = 0;
121 (unit < FLASH_MAP_UNIT_MAX &&
122 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
123 ++unit) {
124 blk = blk_by_legacy_dinfo(pflash_drv);
125 size = blk_getlength(blk);
126 if (size < 0) {
127 fatal_errmsg = g_strdup_printf("failed to get backing file size");
128 } else if (size == 0) {
129 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
130 "cannot have zero size");
131 } else if ((size % sector_size) != 0) {
132 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
133 "must be a multiple of 0x%x", sector_size);
134 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
135 fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
136 "segments cannot be mapped under "
137 TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
138 }
139 if (fatal_errmsg != NULL) {
140 Location loc;
141
142
143
144
145
146 loc_push_none(&loc);
147 if (pflash_drv->opts != NULL) {
148 qemu_opts_loc_restore(pflash_drv->opts);
149 }
150 error_report("%s", fatal_errmsg);
151 loc_pop(&loc);
152 g_free(fatal_errmsg);
153 exit(1);
154 }
155
156 phys_addr -= size;
157
158
159 snprintf(name, sizeof name, "system.flash%d", unit);
160 system_flash = pflash_cfi01_register(phys_addr, NULL , name,
161 size, blk, sector_size,
162 size >> sector_bits,
163 1 ,
164 0x0000 ,
165 0x0000 ,
166 0x0000 ,
167 0x0000 ,
168 0 );
169 if (unit == 0) {
170 flash_mem = pflash_cfi01_get_memory(system_flash);
171 pc_isa_bios_init(rom_memory, flash_mem, size);
172 }
173 }
174}
175
176static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
177{
178 char *filename;
179 MemoryRegion *bios, *isa_bios;
180 int bios_size, isa_bios_size;
181 int ret;
182
183
184 if (bios_name == NULL) {
185 bios_name = BIOS_FILENAME;
186 }
187 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
188 if (filename) {
189 bios_size = get_image_size(filename);
190 } else {
191 bios_size = -1;
192 }
193 if (bios_size <= 0 ||
194 (bios_size % 65536) != 0) {
195 goto bios_error;
196 }
197 bios = g_malloc(sizeof(*bios));
198 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
199 vmstate_register_ram_global(bios);
200 if (!isapc_ram_fw) {
201 memory_region_set_readonly(bios, true);
202 }
203 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
204 if (ret != 0) {
205 bios_error:
206 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
207 exit(1);
208 }
209 g_free(filename);
210
211
212 isa_bios_size = bios_size;
213 if (isa_bios_size > (128 * 1024)) {
214 isa_bios_size = 128 * 1024;
215 }
216 isa_bios = g_malloc(sizeof(*isa_bios));
217 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
218 bios_size - isa_bios_size, isa_bios_size);
219 memory_region_add_subregion_overlap(rom_memory,
220 0x100000 - isa_bios_size,
221 isa_bios,
222 1);
223 if (!isapc_ram_fw) {
224 memory_region_set_readonly(isa_bios, true);
225 }
226
227
228 memory_region_add_subregion(rom_memory,
229 (uint32_t)(-bios_size),
230 bios);
231}
232
233void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
234{
235 DriveInfo *pflash_drv;
236
237 pflash_drv = drive_get(IF_PFLASH, 0, 0);
238
239 if (isapc_ram_fw || pflash_drv == NULL) {
240
241 old_pc_system_rom_init(rom_memory, isapc_ram_fw);
242 return;
243 }
244
245 if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
246
247
248 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
249 exit(1);
250 }
251
252 pc_system_flash_init(rom_memory);
253}
254