hw/i386/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 isapc_ram_fw;
  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, NULL, "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_system_flash_init(MemoryRegion *rom_memory,
  79                                  DriveInfo *pflash_drv)
  80 {
  81     BlockDriverState *bdrv;
  82     int64_t size;
  83     hwaddr phys_addr;
  84     int sector_bits, sector_size;
  85     pflash_t *system_flash;
  86     MemoryRegion *flash_mem;
  87
  88     bdrv = pflash_drv->bdrv;
  89     size = bdrv_getlength(pflash_drv->bdrv);
  90     sector_bits = 12;
  91     sector_size = 1 << sector_bits;
  92
  93     if ((size % sector_size) != 0) {
  94         fprintf(stderr,
  95                 "qemu: PC system firmware (pflash) must be a multiple of 0x%x\n",
  96                 sector_size);
  97         exit(1);
  98     }
  99
 100     phys_addr = 0x100000000ULL - size;
 101     system_flash = pflash_cfi01_register(phys_addr, NULL, "system.flash", size,
 102                                          bdrv, sector_size, size >> sector_bits,
 103                                          1, 0x0000, 0x0000, 0x0000, 0x0000, 0);
 104     flash_mem = pflash_cfi01_get_memory(system_flash);
 105
 106     pc_isa_bios_init(rom_memory, flash_mem, size);
 107 }
 108
 109 static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 110 {
 111     char *filename;
 112     MemoryRegion *bios, *isa_bios;
 113     int bios_size, isa_bios_size;
 114     int ret;
 115
 116     /* BIOS load */
 117     if (bios_name == NULL) {
 118         bios_name = BIOS_FILENAME;
 119     }
 120     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 121     if (filename) {
 122         bios_size = get_image_size(filename);
 123     } else {
 124         bios_size = -1;
 125     }
 126     if (bios_size <= 0 ||
 127         (bios_size % 65536) != 0) {
 128         goto bios_error;
 129     }
 130     bios = g_malloc(sizeof(*bios));
 131     memory_region_init_ram(bios, NULL, "pc.bios", bios_size);
 132     vmstate_register_ram_global(bios);
 133     if (!isapc_ram_fw) {
 134         memory_region_set_readonly(bios, true);
 135     }
 136     ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
 137     if (ret != 0) {
 138     bios_error:
 139         fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
 140         exit(1);
 141     }
 142     if (filename) {
 143         g_free(filename);
 144     }
 145
 146     /* map the last 128KB of the BIOS in ISA space */
 147     isa_bios_size = bios_size;
 148     if (isa_bios_size > (128 * 1024)) {
 149         isa_bios_size = 128 * 1024;
 150     }
 151     isa_bios = g_malloc(sizeof(*isa_bios));
 152     memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
 153                              bios_size - isa_bios_size, isa_bios_size);
 154     memory_region_add_subregion_overlap(rom_memory,
 155                                         0x100000 - isa_bios_size,
 156                                         isa_bios,
 157                                         1);
 158     if (!isapc_ram_fw) {
 159         memory_region_set_readonly(isa_bios, true);
 160     }
 161
 162     /* map all the bios at the top of memory */
 163     memory_region_add_subregion(rom_memory,
 164                                 (uint32_t)(-bios_size),
 165                                 bios);
 166 }
 167
 168 void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
 169 {
 170     DriveInfo *pflash_drv;
 171
 172     pflash_drv = drive_get(IF_PFLASH, 0, 0);
 173
 174     if (isapc_ram_fw || pflash_drv == NULL) {
 175         /* When a pflash drive is not found, use rom-mode */
 176         old_pc_system_rom_init(rom_memory, isapc_ram_fw);
 177         return;
 178     }
 179
 180     if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
 181         /* Older KVM cannot execute from device memory. So, flash memory
 182          * cannot be used unless the readonly memory kvm capability is present. */
 183         fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
 184         exit(1);
 185     }
 186
 187     pc_system_flash_init(rom_memory, pflash_drv);
 188 }