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 "sysemu/blockdev.h"
  27 #include "qemu/error-report.h"
  28 #include "hw/sysbus.h"
  29 #include "hw/hw.h"
  30 #include "hw/pc.h"
  31 #include "hw/boards.h"
  32 #include "hw/loader.h"
  33 #include "sysemu/sysemu.h"
  34 #include "hw/flash.h"
  35 #include "sysemu/kvm.h"
  36
  37 #define BIOS_FILENAME "bios.bin"
  38
  39 typedef struct PcSysFwDevice {
  40     SysBusDevice busdev;
  41     uint8_t rom_only;
  42 } PcSysFwDevice;
  43
  44 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  45                              MemoryRegion *flash_mem,
  46                              int ram_size)
  47 {
  48     int isa_bios_size;
  49     MemoryRegion *isa_bios;
  50     uint64_t flash_size;
  51     void *flash_ptr, *isa_bios_ptr;
  52
  53     flash_size = memory_region_size(flash_mem);
  54
  55     /* map the last 128KB of the BIOS in ISA space */
  56     isa_bios_size = flash_size;
  57     if (isa_bios_size > (128 * 1024)) {
  58         isa_bios_size = 128 * 1024;
  59     }
  60     isa_bios = g_malloc(sizeof(*isa_bios));
  61     memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
  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     /* copy ISA rom image from top of flash memory */
  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 static void pc_fw_add_pflash_drv(void)
  79 {
  80     QemuOpts *opts;
  81     QEMUMachine *machine;
  82     char *filename;
  83
  84     if (bios_name == NULL) {
  85         bios_name = BIOS_FILENAME;
  86     }
  87     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  88     if (!filename) {
  89         error_report("Can't open BIOS image %s", bios_name);
  90         exit(1);
  91     }
  92
  93     opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
  94
  95     g_free(filename);
  96
  97     if (opts == NULL) {
  98       return;
  99     }
 100
 101     machine = find_default_machine();
 102     if (machine == NULL) {
 103       return;
 104     }
 105
 106     if (!drive_init(opts, machine->block_default_type)) {
 107         qemu_opts_del(opts);
 108     }
 109 }
 110
 111 static void pc_system_flash_init(MemoryRegion *rom_memory,
 112                                  DriveInfo *pflash_drv)
 113 {
 114     BlockDriverState *bdrv;
 115     int64_t size;
 116     hwaddr phys_addr;
 117     int sector_bits, sector_size;
 118     pflash_t *system_flash;
 119     MemoryRegion *flash_mem;
 120
 121     bdrv = pflash_drv->bdrv;
 122     size = bdrv_getlength(pflash_drv->bdrv);
 123     sector_bits = 12;
 124     sector_size = 1 << sector_bits;
 125
 126     if ((size % sector_size) != 0) {
 127         fprintf(stderr,
 128                 "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
 129                 sector_size);
 130         exit(1);
 131     }
 132
 133     phys_addr = 0x100000000ULL - size;
 134     system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
 135                                          bdrv, sector_size, size >> sector_bits,
 136                                          1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
 137     flash_mem = pflash_cfi01_get_memory(system_flash);
 138
 139     pc_isa_bios_init(rom_memory, flash_mem, size);
 140 }
 141
 142 static void old_pc_system_rom_init(MemoryRegion *rom_memory)
 143 {
 144     char *filename;
 145     MemoryRegion *bios, *isa_bios;
 146     int bios_size, isa_bios_size;
 147     int ret;
 148
 149     /* BIOS load */
 150     if (bios_name == NULL) {
 151         bios_name = BIOS_FILENAME;
 152     }
 153     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 154     if (filename) {
 155         bios_size = get_image_size(filename);
 156     } else {
 157         bios_size = -1;
 158     }
 159     if (bios_size <= 0 ||
 160         (bios_size % 65536) != 0) {
 161         goto bios_error;
 162     }
 163     bios = g_malloc(sizeof(*bios));
 164     memory_region_init_ram(bios, "pc.bios", bios_size);
 165     vmstate_register_ram_global(bios);
 166     memory_region_set_readonly(bios, true);
 167     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 168     if (ret != 0) {
 169     bios_error:
 170         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 171         exit(1);
 172     }
 173     if (filename) {
 174         g_free(filename);
 175     }
 176
 177     /* map the last 128KB of the BIOS in ISA space */
 178     isa_bios_size = bios_size;
 179     if (isa_bios_size > (128 * 1024)) {
 180         isa_bios_size = 128 * 1024;
 181     }
 182     isa_bios = g_malloc(sizeof(*isa_bios));
 183     memory_region_init_alias(isa_bios, "isa-bios", bios,
 184                              bios_size - isa_bios_size, isa_bios_size);
 185     memory_region_add_subregion_overlap(rom_memory,
 186                                         0x100000 - isa_bios_size,
 187                                         isa_bios,
 188                                         1);
 189     memory_region_set_readonly(isa_bios, true);
 190
 191     /* map all the bios at the top of memory */
 192     memory_region_add_subregion(rom_memory,
 193                                 (uint32_t)(-bios_size),
 194                                 bios);
 195 }
 196
 197 void pc_system_firmware_init(MemoryRegion *rom_memory)
 198 {
 199     DriveInfo *pflash_drv;
 200     PcSysFwDevice *sysfw_dev;
 201
 202     sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
 203
 204     qdev_init_nofail(DEVICE(sysfw_dev));
 205
 206     if (sysfw_dev->rom_only) {
 207         old_pc_system_rom_init(rom_memory);
 208         return;
 209     }
 210
 211     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 212
 213     /* Currently KVM cannot execute from device memory.
 214        Use old rom based firmware initialization for KVM. */
 215     if (kvm_enabled()) {
 216         if (pflash_drv != NULL) {
 217             fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
 218             exit(1);
 219         } else {
 220             sysfw_dev->rom_only = 1;
 221             old_pc_system_rom_init(rom_memory);
 222             return;
 223         }
 224     }
 225
 226     /* If a pflash drive is not found, then create one using
 227        the bios filename. */
 228     if (pflash_drv == NULL) {
 229         pc_fw_add_pflash_drv();
 230         pflash_drv = drive_get(IF_PFLASH, 0, 0);
 231     }
 232
 233     if (pflash_drv != NULL) {
 234         pc_system_flash_init(rom_memory, pflash_drv);
 235     } else {
 236         fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
 237         exit(1);
 238     }
 239 }
 240
 241 static Property pcsysfw_properties[] = {
 242     DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 0),
 243     DEFINE_PROP_END_OF_LIST(),
 244 };
 245
 246 static int pcsysfw_init(DeviceState *dev)
 247 {
 248     return 0;
 249 }
 250
 251 static void pcsysfw_class_init (ObjectClass *klass, void *data)
 252 {
 253     DeviceClass *dc = DEVICE_CLASS (klass);
 254
 255     dc->desc = "PC System Firmware";
 256     dc->init = pcsysfw_init;
 257     dc->props = pcsysfw_properties;
 258 }
 259
 260 static const TypeInfo pcsysfw_info = {
 261     .name          = "pc-sysfw",
 262     .parent        = TYPE_SYS_BUS_DEVICE,
 263     .instance_size = sizeof (PcSysFwDevice),
 264     .class_init    = pcsysfw_class_init,
 265 };
 266
 267 static void pcsysfw_register (void)
 268 {
 269     type_register_static (&pcsysfw_info);
 270 }
 271
 272 type_init (pcsysfw_register);
 273