hw/pc_sysfw.c

   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 "blockdev.h"
  27 #include "sysbus.h"
  28 #include "hw.h"
  29 #include "pc.h"
  30 #include "hw/boards.h"
  31 #include "loader.h"
  32 #include "sysemu.h"
  33 #include "flash.h"
  34 #include "kvm.h"
  35
  36 #define BIOS_FILENAME "bios.bin"
  37
  38 typedef struct PcSysFwDevice {
  39     SysBusDevice busdev;
  40     uint8_t rom_only;
  41 } PcSysFwDevice;
  42
  43 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  44                              MemoryRegion *flash_mem,
  45                              int ram_size)
  46 {
  47     int isa_bios_size;
  48     MemoryRegion *isa_bios;
  49     uint64_t flash_size;
  50     void *flash_ptr, *isa_bios_ptr;
  51
  52     flash_size = memory_region_size(flash_mem);
  53
  54     /* map the last 128KB of the BIOS in ISA space */
  55     isa_bios_size = flash_size;
  56     if (isa_bios_size > (128 * 1024)) {
  57         isa_bios_size = 128 * 1024;
  58     }
  59     isa_bios = g_malloc(sizeof(*isa_bios));
  60     memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
  61     vmstate_register_ram_global(isa_bios);
  62     memory_region_add_subregion_overlap(rom_memory,
  63                                         0x100000 - isa_bios_size,
  64                                         isa_bios,
  65                                         1);
  66
  67     /* copy ISA rom image from top of flash memory */
  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 static void pc_fw_add_pflash_drv(void)
  78 {
  79     QemuOpts *opts;
  80     QEMUMachine *machine;
  81     char *filename;
  82
  83     if (bios_name == NULL) {
  84         bios_name = BIOS_FILENAME;
  85     }
  86     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  87
  88     opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
  89
  90     g_free(filename);
  91
  92     if (opts == NULL) {
  93       return;
  94     }
  95
  96     machine = find_default_machine();
  97     if (machine == NULL) {
  98       return;
  99     }
 100
 101     drive_init(opts, machine->use_scsi);
 102 }
 103
 104 static void pc_system_flash_init(MemoryRegion *rom_memory,
 105                                  DriveInfo *pflash_drv)
 106 {
 107     BlockDriverState *bdrv;
 108     int64_t size;
 109     hwaddr phys_addr;
 110     int sector_bits, sector_size;
 111     pflash_t *system_flash;
 112     MemoryRegion *flash_mem;
 113
 114     bdrv = pflash_drv->bdrv;
 115     size = bdrv_getlength(pflash_drv->bdrv);
 116     sector_bits = 12;
 117     sector_size = 1 << sector_bits;
 118
 119     if ((size % sector_size) != 0) {
 120         fprintf(stderr,
 121                 "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
 122                 sector_size);
 123         exit(1);
 124     }
 125
 126     phys_addr = 0x100000000ULL - size;
 127     system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
 128                                          bdrv, sector_size, size >> sector_bits,
 129                                          1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
 130     flash_mem = pflash_cfi01_get_memory(system_flash);
 131
 132     pc_isa_bios_init(rom_memory, flash_mem, size);
 133 }
 134
 135 static void old_pc_system_rom_init(MemoryRegion *rom_memory)
 136 {
 137     char *filename;
 138     MemoryRegion *bios, *isa_bios;
 139     int bios_size, isa_bios_size;
 140     int ret;
 141
 142     /* BIOS load */
 143     if (bios_name == NULL) {
 144         bios_name = BIOS_FILENAME;
 145     }
 146     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 147     if (filename) {
 148         bios_size = get_image_size(filename);
 149     } else {
 150         bios_size = -1;
 151     }
 152     if (bios_size <= 0 ||
 153         (bios_size % 65536) != 0) {
 154         goto bios_error;
 155     }
 156     bios = g_malloc(sizeof(*bios));
 157     memory_region_init_ram(bios, "pc.bios", bios_size);
 158     vmstate_register_ram_global(bios);
 159     memory_region_set_readonly(bios, true);
 160     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 161     if (ret != 0) {
 162     bios_error:
 163         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 164         exit(1);
 165     }
 166     if (filename) {
 167         g_free(filename);
 168     }
 169
 170     /* map the last 128KB of the BIOS in ISA space */
 171     isa_bios_size = bios_size;
 172     if (isa_bios_size > (128 * 1024)) {
 173         isa_bios_size = 128 * 1024;
 174     }
 175     isa_bios = g_malloc(sizeof(*isa_bios));
 176     memory_region_init_alias(isa_bios, "isa-bios", bios,
 177                              bios_size - isa_bios_size, isa_bios_size);
 178     memory_region_add_subregion_overlap(rom_memory,
 179                                         0x100000 - isa_bios_size,
 180                                         isa_bios,
 181                                         1);
 182     memory_region_set_readonly(isa_bios, true);
 183
 184     /* map all the bios at the top of memory */
 185     memory_region_add_subregion(rom_memory,
 186                                 (uint32_t)(-bios_size),
 187                                 bios);
 188 }
 189
 190 void pc_system_firmware_init(MemoryRegion *rom_memory)
 191 {
 192     DriveInfo *pflash_drv;
 193     PcSysFwDevice *sysfw_dev;
 194
 195     sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
 196
 197     qdev_init_nofail(DEVICE(sysfw_dev));
 198
 199     if (sysfw_dev->rom_only) {
 200         old_pc_system_rom_init(rom_memory);
 201         return;
 202     }
 203
 204     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 205
 206     /* Currently KVM cannot execute from device memory.
 207        Use old rom based firmware initialization for KVM. */
 208     if (kvm_enabled()) {
 209         if (pflash_drv != NULL) {
 210             fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
 211             exit(1);
 212         } else {
 213             sysfw_dev->rom_only = 1;
 214             old_pc_system_rom_init(rom_memory);
 215             return;
 216         }
 217     }
 218
 219     /* If a pflash drive is not found, then create one using
 220        the bios filename. */
 221     if (pflash_drv == NULL) {
 222         pc_fw_add_pflash_drv();
 223         pflash_drv = drive_get(IF_PFLASH, 0, 0);
 224     }
 225
 226     if (pflash_drv != NULL) {
 227         pc_system_flash_init(rom_memory, pflash_drv);
 228     } else {
 229         fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
 230         exit(1);
 231     }
 232 }
 233
 234 static Property pcsysfw_properties[] = {
 235     DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 0),
 236     DEFINE_PROP_END_OF_LIST(),
 237 };
 238
 239 static int pcsysfw_init(DeviceState *dev)
 240 {
 241     return 0;
 242 }
 243
 244 static void pcsysfw_class_init (ObjectClass *klass, void *data)
 245 {
 246     DeviceClass *dc = DEVICE_CLASS (klass);
 247
 248     dc->desc = "PC System Firmware";
 249     dc->init = pcsysfw_init;
 250     dc->props = pcsysfw_properties;
 251 }
 252
 253 static TypeInfo pcsysfw_info = {
 254     .name          = "pc-sysfw",
 255     .parent        = TYPE_SYS_BUS_DEVICE,
 256     .instance_size = sizeof (PcSysFwDevice),
 257     .class_init    = pcsysfw_class_init,
 258 };
 259
 260 static void pcsysfw_register (void)
 261 {
 262     type_register_static (&pcsysfw_info);
 263 }
 264
 265 type_init (pcsysfw_register);
 266