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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 memory_region_add_subregion_overlap(rom_memory,
63 0x100000 - isa_bios_size,
64 isa_bios,
65 1);
66
67
68 flash_ptr = memory_region_get_ram_ptr(flash_mem);
69 isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
70 memcpy(isa_bios_ptr,
71 ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
72 isa_bios_size);
73
74 memory_region_set_readonly(isa_bios, true);
75}
76
77#define FLASH_MAP_UNIT_MAX 2
78
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84
85#define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
86
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102
103static void pc_system_flash_init(MemoryRegion *rom_memory)
104{
105 int unit;
106 DriveInfo *pflash_drv;
107 BlockBackend *blk;
108 int64_t size;
109 char *fatal_errmsg = NULL;
110 hwaddr phys_addr = 0x100000000ULL;
111 int sector_bits, sector_size;
112 pflash_t *system_flash;
113 MemoryRegion *flash_mem;
114 char name[64];
115
116 sector_bits = 12;
117 sector_size = 1 << sector_bits;
118
119 for (unit = 0;
120 (unit < FLASH_MAP_UNIT_MAX &&
121 (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
122 ++unit) {
123 blk = blk_by_legacy_dinfo(pflash_drv);
124 size = blk_getlength(blk);
125 if (size < 0) {
126 fatal_errmsg = g_strdup_printf("failed to get backing file size");
127 } else if (size == 0) {
128 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
129 "cannot have zero size");
130 } else if ((size % sector_size) != 0) {
131 fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
132 "must be a multiple of 0x%x", sector_size);
133 } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
134 fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
135 "segments cannot be mapped under "
136 TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
137 }
138 if (fatal_errmsg != NULL) {
139 Location loc;
140
141
142
143
144
145 loc_push_none(&loc);
146 if (pflash_drv->opts != NULL) {
147 qemu_opts_loc_restore(pflash_drv->opts);
148 }
149 error_report("%s", fatal_errmsg);
150 loc_pop(&loc);
151 g_free(fatal_errmsg);
152 exit(1);
153 }
154
155 phys_addr -= size;
156
157
158 snprintf(name, sizeof name, "system.flash%d", unit);
159 system_flash = pflash_cfi01_register(phys_addr, NULL , name,
160 size, blk, sector_size,
161 size >> sector_bits,
162 1 ,
163 0x0000 ,
164 0x0000 ,
165 0x0000 ,
166 0x0000 ,
167 0 );
168 if (unit == 0) {
169 flash_mem = pflash_cfi01_get_memory(system_flash);
170 pc_isa_bios_init(rom_memory, flash_mem, size);
171 }
172 }
173}
174
175static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
176{
177 char *filename;
178 MemoryRegion *bios, *isa_bios;
179 int bios_size, isa_bios_size;
180 int ret;
181
182
183 if (bios_name == NULL) {
184 bios_name = BIOS_FILENAME;
185 }
186 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
187 if (filename) {
188 bios_size = get_image_size(filename);
189 } else {
190 bios_size = -1;
191 }
192 if (bios_size <= 0 ||
193 (bios_size % 65536) != 0) {
194 goto bios_error;
195 }
196 bios = g_malloc(sizeof(*bios));
197 memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
198 if (!isapc_ram_fw) {
199 memory_region_set_readonly(bios, true);
200 }
201 ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
202 if (ret != 0) {
203 bios_error:
204 fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
205 exit(1);
206 }
207 g_free(filename);
208
209
210 isa_bios_size = bios_size;
211 if (isa_bios_size > (128 * 1024)) {
212 isa_bios_size = 128 * 1024;
213 }
214 isa_bios = g_malloc(sizeof(*isa_bios));
215 memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
216 bios_size - isa_bios_size, isa_bios_size);
217 memory_region_add_subregion_overlap(rom_memory,
218 0x100000 - isa_bios_size,
219 isa_bios,
220 1);
221 if (!isapc_ram_fw) {
222 memory_region_set_readonly(isa_bios, true);
223 }
224
225
226 memory_region_add_subregion(rom_memory,
227 (uint32_t)(-bios_size),
228 bios);
229}
230
231void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
232{
233 DriveInfo *pflash_drv;
234
235 pflash_drv = drive_get(IF_PFLASH, 0, 0);
236
237 if (isapc_ram_fw || pflash_drv == NULL) {
238
239 old_pc_system_rom_init(rom_memory, isapc_ram_fw);
240 return;
241 }
242
243 if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
244
245
246 fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
247 exit(1);
248 }
249
250 pc_system_flash_init(rom_memory);
251}
252