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 } 189