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 "sysbus.h"
  27 #include "hw.h"
  28 #include "pc.h"
  29 #include "hw/boards.h"
  30 #include "loader.h"
  31 #include "sysemu.h"
  32 #include "flash.h"
  33 #include "kvm.h"
  34
  35 #define BIOS_FILENAME "bios.bin"
  36
  37 typedef struct PcSysFwDevice {
  38     SysBusDevice busdev;
  39     uint8_t rom_only;
  40 } PcSysFwDevice;
  41
  42 static void pc_isa_bios_init(MemoryRegion *rom_memory,
  43                              MemoryRegion *flash_mem,
  44                              int ram_size)
  45 {
  46     int isa_bios_size;
  47     MemoryRegion *isa_bios;
  48     uint64_t flash_size;
  49     void *flash_ptr, *isa_bios_ptr;
  50
  51     flash_size = memory_region_size(flash_mem);
  52
  53     /* map the last 128KB of the BIOS in ISA space */
  54     isa_bios_size = flash_size;
  55     if (isa_bios_size > (128 * 1024)) {
  56         isa_bios_size = 128 * 1024;
  57     }
  58     isa_bios = g_malloc(sizeof(*isa_bios));
  59     memory_region_init_ram(isa_bios, "isa-bios", isa_bios_size);
  60     vmstate_register_ram_global(isa_bios);
  61     memory_region_add_subregion_overlap(rom_memory,
  62                                         0x100000 - isa_bios_size,
  63                                         isa_bios,
  64                                         1);
  65
  66     /* copy ISA rom image from top of flash memory */
  67     flash_ptr = memory_region_get_ram_ptr(flash_mem);
  68     isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
  69     memcpy(isa_bios_ptr,
  70            ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
  71            isa_bios_size);
  72
  73     memory_region_set_readonly(isa_bios, true);
  74 }
  75
  76 static void pc_fw_add_pflash_drv(void)
  77 {
  78     QemuOpts *opts;
  79     QEMUMachine *machine;
  80     char *filename;
  81
  82     if (bios_name == NULL) {
  83         bios_name = BIOS_FILENAME;
  84     }
  85     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
  86
  87     opts = drive_add(IF_PFLASH, -1, filename, "readonly=on");
  88     if (opts == NULL) {
  89       return;
  90     }
  91
  92     machine = find_default_machine();
  93     if (machine == NULL) {
  94       return;
  95     }
  96
  97     drive_init(opts, machine->use_scsi);
  98 }
  99
 100 static void pc_system_flash_init(MemoryRegion *rom_memory,
 101                                  DriveInfo *pflash_drv)
 102 {
 103     BlockDriverState *bdrv;
 104     int64_t size;
 105     target_phys_addr_t phys_addr;
 106     int sector_bits, sector_size;
 107     pflash_t *system_flash;
 108     MemoryRegion *flash_mem;
 109
 110     bdrv = pflash_drv->bdrv;
 111     size = bdrv_getlength(pflash_drv->bdrv);
 112     sector_bits = 12;
 113     sector_size = 1 << sector_bits;
 114
 115     if ((size % sector_size) != 0) {
 116         fprintf(stderr,
 117                 "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
 118                 sector_size);
 119         exit(1);
 120     }
 121
 122     phys_addr = 0x100000000ULL - size;
 123     system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
 124                                          bdrv, sector_size, size >> sector_bits,
 125                                          1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
 126     flash_mem = pflash_cfi01_get_memory(system_flash);
 127
 128     pc_isa_bios_init(rom_memory, flash_mem, size);
 129 }
 130
 131 static void old_pc_system_rom_init(MemoryRegion *rom_memory)
 132 {
 133     char *filename;
 134     MemoryRegion *bios, *isa_bios;
 135     int bios_size, isa_bios_size;
 136     int ret;
 137
 138     /* BIOS load */
 139     if (bios_name == NULL) {
 140         bios_name = BIOS_FILENAME;
 141     }
 142     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 143     if (filename) {
 144         bios_size = get_image_size(filename);
 145     } else {
 146         bios_size = -1;
 147     }
 148     if (bios_size <= 0 ||
 149         (bios_size % 65536) != 0) {
 150         goto bios_error;
 151     }
 152     bios = g_malloc(sizeof(*bios));
 153     memory_region_init_ram(bios, "pc.bios", bios_size);
 154     vmstate_register_ram_global(bios);
 155     memory_region_set_readonly(bios, true);
 156     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 157     if (ret != 0) {
 158     bios_error:
 159         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 160         exit(1);
 161     }
 162     if (filename) {
 163         g_free(filename);
 164     }
 165
 166     /* map the last 128KB of the BIOS in ISA space */
 167     isa_bios_size = bios_size;
 168     if (isa_bios_size > (128 * 1024)) {
 169         isa_bios_size = 128 * 1024;
 170     }
 171     isa_bios = g_malloc(sizeof(*isa_bios));
 172     memory_region_init_alias(isa_bios, "isa-bios", bios,
 173                              bios_size - isa_bios_size, isa_bios_size);
 174     memory_region_add_subregion_overlap(rom_memory,
 175                                         0x100000 - isa_bios_size,
 176                                         isa_bios,
 177                                         1);
 178     memory_region_set_readonly(isa_bios, true);
 179
 180     /* map all the bios at the top of memory */
 181     memory_region_add_subregion(rom_memory,
 182                                 (uint32_t)(-bios_size),
 183                                 bios);
 184 }
 185
 186 void pc_system_firmware_init(MemoryRegion *rom_memory)
 187 {
 188     DriveInfo *pflash_drv;
 189     PcSysFwDevice *sysfw_dev;
 190
 191     sysfw_dev = (PcSysFwDevice*) qdev_create(NULL, "pc-sysfw");
 192
 193     qdev_init_nofail(DEVICE(sysfw_dev));
 194
 195     if (sysfw_dev->rom_only) {
 196         old_pc_system_rom_init(rom_memory);
 197         return;
 198     }
 199
 200     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 201
 202     /* Currently KVM cannot execute from device memory.
 203        Use old rom based firmware initialization for KVM. */
 204     if (kvm_enabled()) {
 205         if (pflash_drv != NULL) {
 206             fprintf(stderr, "qemu: pflash cannot be used with kvm enabled\n");
 207             exit(1);
 208         } else {
 209             sysfw_dev->rom_only = 1;
 210             old_pc_system_rom_init(rom_memory);
 211             return;
 212         }
 213     }
 214
 215     /* If a pflash drive is not found, then create one using
 216        the bios filename. */
 217     if (pflash_drv == NULL) {
 218         pc_fw_add_pflash_drv();
 219         pflash_drv = drive_get(IF_PFLASH, 0, 0);
 220     }
 221
 222     if (pflash_drv != NULL) {
 223         pc_system_flash_init(rom_memory, pflash_drv);
 224     } else {
 225         fprintf(stderr, "qemu: PC system firmware (pflash) not available\n");
 226         exit(1);
 227     }
 228 }
 229
 230 static Property pcsysfw_properties[] = {
 231     DEFINE_PROP_UINT8("rom_only", PcSysFwDevice, rom_only, 0),
 232     DEFINE_PROP_END_OF_LIST(),
 233 };
 234
 235 static int pcsysfw_init(DeviceState *dev)
 236 {
 237     return 0;
 238 }
 239
 240 static void pcsysfw_class_init (ObjectClass *klass, void *data)
 241 {
 242     DeviceClass *dc = DEVICE_CLASS (klass);
 243
 244     dc->desc = "PC System Firmware";
 245     dc->init = pcsysfw_init;
 246     dc->props = pcsysfw_properties;
 247 }
 248
 249 static TypeInfo pcsysfw_info = {
 250     .name          = "pc-sysfw",
 251     .parent        = TYPE_SYS_BUS_DEVICE,
 252     .instance_size = sizeof (PcSysFwDevice),
 253     .class_init    = pcsysfw_class_init,
 254 };
 255
 256 static void pcsysfw_register (void)
 257 {
 258     type_register_static (&pcsysfw_info);
 259 }
 260
 261 type_init (pcsysfw_register);
 262