hw/block/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/i386/pc.h"
  31 #include "hw/boards.h"
  32 #include "hw/loader.h"
  33 #include "sysemu/sysemu.h"
  34 #include "hw/block/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     uint8_t isapc_ram_fw;
  43 } PcSysFwDevice;
  44
  45 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  46                              MemoryRegion *flash_mem,
  47                              int ram_size)
  48 {
  49     int isa_bios_size;
  50     MemoryRegion *isa_bios;
  51     uint64_t flash_size;
  52     void *flash_ptr, *isa_bios_ptr;
  53
  54     flash_size = memory_region_size(flash_mem);
  55
  56     /* map the last 128KB of the BIOS in ISA space */
  57     isa_bios_size = flash_size;
  58     if (isa_bios_size > (128 * 1024)) {
  59         isa_bios_size = 128 * 1024;
  60     }
  61     isa_bios = g_malloc(sizeof(*isa_bios));
  62     memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
  63     vmstate_register_ram_global(isa_bios);
  64     memory_region_add_subregion_overlap(rom_memory,
  65                                         0x100000 - isa_bios_size,
  66                                         isa_bios,
  67                                         1);
  68
  69     /* copy ISA rom image from top of flash memory */
  70     flash_ptr = memory_region_get_ram_ptr(flash_mem);
  71     isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  72     memcpy(isa_bios_ptr,
  73            ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  74            isa_bios_size);
  75
  76     memory_region_set_readonly(isa_bios, true);
  77 }
  78
  79 static void pc_fw_add_pflash_drv(void)
  80 {
  81     QemuOpts *opts;
  82     QEMUMachine *machine;
  83     char *filename;
  84
  85     if (bios_name == NULL) {
  86         bios_name = BIOS_FILENAME;
  87     }
  88     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  89     if (!filename) {
  90         error_report("Can't open BIOS image %s", bios_name);
  91         exit(1);
  92     }
  93
  94     opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
  95
  96     g_free(filename);
  97
  98     if (opts == NULL) {
  99       return;
 100     }
 101
 102     machine = find_default_machine();
 103     if (machine == NULL) {
 104       return;
 105     }
 106
 107     if (!drive_init(opts, machine->block_default_type)) {
 108         qemu_opts_del(opts);
 109     }
 110 }
 111
 112 static void pc_system_flash_init(MemoryRegion *rom_memory,
 113                                  DriveInfo *pflash_drv)
 114 {
 115     BlockDriverState *bdrv;
 116     int64_t size;
 117     hwaddr phys_addr;
 118     int sector_bits, sector_size;
 119     pflash_t *system_flash;
 120     MemoryRegion *flash_mem;
 121
 122     bdrv = pflash_drv->bdrv;
 123     size = bdrv_getlength(pflash_drv->bdrv);
 124     sector_bits = 12;
 125     sector_size = 1 << sector_bits;
 126
 127     if ((size % sector_size) != 0) {
 128         fprintf(stderr,
 129                 "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
 130                 sector_size);
 131         exit(1);
 132     }
 133
 134     phys_addr = 0x100000000ULL - size;
 135     system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
 136                                          bdrv, sector_size, size >> sector_bits,
 137                                          1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
 138     flash_mem = pflash_cfi01_get_memory(system_flash);
 139
 140     pc_isa_bios_init(rom_memory, flash_mem, size);
 141 }
 142
 143 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 144 {
 145     char *filename;
 146     MemoryRegion *bios, *isa_bios;
 147     int bios_size, isa_bios_size;
 148     int ret;
 149
 150     /* BIOS load */
 151     if (bios_name == NULL) {
 152         bios_name = BIOS_FILENAME;
 153     }
 154     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 155     if (filename) {
 156         bios_size = get_image_size(filename);
 157     } else {
 158         bios_size = -1;
 159     }
 160     if (bios_size <= 0 ||
 161         (bios_size % 65536) != 0) {
 162         goto bios_error;
 163     }
 164     bios = g_malloc(sizeof(*bios));
 165     memory_region_init_ram(bios, "pc.bios", bios_size);
 166     vmstate_register_ram_global(bios);
 167     if (!isapc_ram_fw) {
 168         memory_region_set_readonly(bios, true);
 169     }
 170     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 171     if (ret != 0) {
 172     bios_error:
 173         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 174         exit(1);
 175     }
 176     if (filename) {
 177         g_free(filename);
 178     }
 179
 180     /* map the last 128KB of the BIOS in ISA space */
 181     isa_bios_size = bios_size;
 182     if (isa_bios_size > (128 * 1024)) {
 183         isa_bios_size = 128 * 1024;
 184     }
 185     isa_bios = g_malloc(sizeof(*isa_bios));
 186     memory_region_init_alias(isa_bios, "isa-bios", bios,
 187                              bios_size - isa_bios_size, isa_bios_size);
 188     memory_region_add_subregion_overlap(rom_memory,
 189                                         0x100000 - isa_bios_size,
 190                                         isa_bios,
 191                                         1);
 192     if (!isapc_ram_fw) {
 193         memory_region_set_readonly(isa_bios, true);
 194     }
 195
 196     /* map all the bios at the top of memory */
 197     memory_region_add_subregion(rom_memory,
 198                                 (uint32_t)(-bios_size),
 199                                 bios);
 200 }
 201
 202 /*
 203  * Bug-compatible flash vs. ROM selection enabled?
 204  * A few older machines enable this.
 205  */
 206 bool pc_sysfw_flash_vs_rom_bug_compatible;
 207
 208 void pc_system_firmware_init(MemoryRegion *rom_memory)
 209 {
 210     DriveInfo *pflash_drv;
 211     PcSysFwDevice *sysfw_dev;
 212
 213     /*
 214      * TODO This device exists only so that users can switch between
 215      * use of flash and ROM for the BIOS.  The ability to switch was
 216      * created because flash doesn't work with KVM.  Once it does, we
 217      * should drop this device.
 218      */
 219     sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
 220
 221     qdev_init_nofail(DEVICE(sysfw_dev));
 222
 223     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 224
 225     if (pc_sysfw_flash_vs_rom_bug_compatible) {
 226         /*
 227          * This is a Bad Idea, because it makes enabling/disabling KVM
 228          * guest-visible.  Do it only in bug-compatibility mode.
 229          */
 230         if (kvm_enabled()) {
 231             if (pflash_drv != NULL) {
 232                 fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
 233                 exit(1);
 234             } else {
 235                 /* In old pc_sysfw_flash_vs_rom_bug_compatible mode, we assume
 236                  * that KVM cannot execute from device memory. In this case, we
 237                  * use old rom based firmware initialization for KVM. But, since
 238                  * this is different from non-kvm mode, this behavior is
 239                  * undesirable */
 240                 sysfw_dev->rom_only = 1;
 241             }
 242         }
 243     } else if (pflash_drv == NULL) {
 244         /* When a pflash drive is not found, use rom-mode */
 245         sysfw_dev->rom_only = 1;
 246     } else if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 247         /* Older KVM cannot execute from device memory. So, flash memory
 248          * cannot be used unless the readonly memory kvm capability is present. */
 249         fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
 250         exit(1);
 251     }
 252
 253     /* If rom-mode is active, use the old pc system rom initialization. */
 254     if (sysfw_dev->rom_only) {
 255         old_pc_system_rom_init(rom_memory, sysfw_dev->isapc_ram_fw);
 256         return;
 257     }
 258
 259     /* If a pflash drive is not found, then create one using
 260        the bios filename. */
 261     if (pflash_drv == NULL) {
 262         pc_fw_add_pflash_drv();
 263         pflash_drv = drive_get(IF_PFLASH, 0, 0);
 264     }
 265
 266     if (pflash_drv != NULL) {
 267         pc_system_flash_init(rom_memory, pflash_drv);
 268     } else {
 269         fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
 270         exit(1);
 271     }
 272 }
 273
 274 static Property pcsysfw_properties[] = {
 275     DEFINE_PROP_UINT8("isapc_ram_fw", PcSysFwDevice, isapc_ram_fw, 0),
 276     DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 0),
 277     DEFINE_PROP_END_OF_LIST(),
 278 };
 279
 280 static int pcsysfw_init(DeviceState *dev)
 281 {
 282     return 0;
 283 }
 284
 285 static void pcsysfw_class_init (ObjectClass *klass, void *data)
 286 {
 287     DeviceClass *dc = DEVICE_CLASS (klass);
 288
 289     dc->desc = "PC System Firmware";
 290     dc->init = pcsysfw_init;
 291     dc->props = pcsysfw_properties;
 292 }
 293
 294 static const TypeInfo pcsysfw_info = {
 295     .name          = "pc-sysfw",
 296     .parent        = TYPE_SYS_BUS_DEVICE,
 297     .instance_size = sizeof (PcSysFwDevice),
 298     .class_init    = pcsysfw_class_init,
 299 };
 300
 301 static void pcsysfw_register (void)
 302 {
 303     type_register_static (&pcsysfw_info);
 304 }
 305
 306 type_init (pcsysfw_register);
 307