/* * QEMU PC System Firmware * * Copyright (c) 2003-2004 Fabrice Bellard * Copyright (c) 2011-2012 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "sysemu/blockdev.h" #include "qemu/error-report.h" #include "hw/sysbus.h" #include "hw/hw.h" #include "hw/i386/pc.h" #include "hw/boards.h" #include "hw/loader.h" #include "sysemu/sysemu.h" #include "hw/block/flash.h" #include "sysemu/kvm.h" #define BIOS_FILENAME "bios.bin" typedef struct PcSysFwDevice { SysBusDevice busdev; uint8_t isapc_ram_fw; } PcSysFwDevice; static void pc_isa_bios_init(MemoryRegion *rom_memory, MemoryRegion *flash_mem, int ram_size) { int isa_bios_size; MemoryRegion *isa_bios; uint64_t flash_size; void *flash_ptr, *isa_bios_ptr; flash_size = memory_region_size(flash_mem); /* map the last 128KB of the BIOS in ISA space */ isa_bios_size = MIN(flash_size, 128 * 1024); isa_bios = g_malloc(sizeof(*isa_bios)); memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size); vmstate_register_ram_global(isa_bios); memory_region_add_subregion_overlap(rom_memory, 0x100000 - isa_bios_size, isa_bios, 1); /* copy ISA rom image from top of flash memory */ flash_ptr = memory_region_get_ram_ptr(flash_mem); isa_bios_ptr = memory_region_get_ram_ptr(isa_bios); memcpy(isa_bios_ptr, ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), isa_bios_size); memory_region_set_readonly(isa_bios, true); } #define FLASH_MAP_UNIT_MAX 2 /* We don't have a theoretically justifiable exact lower bound on the base * address of any flash mapping. In practice, the IO-APIC MMIO range is * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in * size. */ #define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024)) /* This function maps flash drives from 4G downward, in order of their unit * numbers. The mapping starts at unit#0, with unit number increments of 1, and * stops before the first missing flash drive, or before * unit#FLASH_MAP_UNIT_MAX, whichever is reached first. * * Addressing within one flash drive is of course not reversed. * * An error message is printed and the process exits if: * - the size of the backing file for a flash drive is non-positive, or not a * multiple of the required sector size, or * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN. * * The drive with unit#0 (if available) is mapped at the highest address, and * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is * not supported. */ static void pc_system_flash_init(MemoryRegion *rom_memory) { int unit; DriveInfo *pflash_drv; BlockDriverState *bdrv; int64_t size; char *fatal_errmsg = NULL; hwaddr phys_addr = 0x100000000ULL; int sector_bits, sector_size; pflash_t *system_flash; MemoryRegion *flash_mem; char name[64]; sector_bits = 12; sector_size = 1 << sector_bits; for (unit = 0; (unit < FLASH_MAP_UNIT_MAX && (pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL); ++unit) { bdrv = pflash_drv->bdrv; size = bdrv_getlength(bdrv); if (size < 0) { fatal_errmsg = g_strdup_printf("failed to get backing file size"); } else if (size == 0) { fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " "cannot have zero size"); } else if ((size % sector_size) != 0) { fatal_errmsg = g_strdup_printf("PC system firmware (pflash) " "must be a multiple of 0x%x", sector_size); } else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) { fatal_errmsg = g_strdup_printf("oversized backing file, pflash " "segments cannot be mapped under " TARGET_FMT_plx, FLASH_MAP_BASE_MIN); } if (fatal_errmsg != NULL) { Location loc; /* push a new, "none" location on the location stack; overwrite its * contents with the location saved in the option; print the error * (includes location); pop the top */ loc_push_none(&loc); if (pflash_drv->opts != NULL) { qemu_opts_loc_restore(pflash_drv->opts); } error_report("%s", fatal_errmsg); loc_pop(&loc); g_free(fatal_errmsg); exit(1); } phys_addr -= size; /* pflash_cfi01_register() creates a deep copy of the name */ snprintf(name, sizeof name, "system.flash%d", unit); system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name, size, bdrv, sector_size, size >> sector_bits, 1 /* width */, 0x0000 /* id0 */, 0x0000 /* id1 */, 0x0000 /* id2 */, 0x0000 /* id3 */, 0 /* be */); if (unit == 0) { flash_mem = pflash_cfi01_get_memory(system_flash); pc_isa_bios_init(rom_memory, flash_mem, size); } } } static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw) { char *filename; MemoryRegion *bios, *isa_bios; int bios_size, isa_bios_size; int ret; /* BIOS load */ if (bios_name == NULL) { bios_name = BIOS_FILENAME; } filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); if (filename) { bios_size = get_image_size(filename); } else { bios_size = -1; } if (bios_size <= 0 || (bios_size % 65536) != 0) { goto bios_error; } bios = g_malloc(sizeof(*bios)); memory_region_init_ram(bios, NULL, "pc.bios", bios_size); vmstate_register_ram_global(bios); if (!isapc_ram_fw) { memory_region_set_readonly(bios, true); } ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1); if (ret != 0) { bios_error: fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name); exit(1); } if (filename) { g_free(filename); } /* map the last 128KB of the BIOS in ISA space */ isa_bios_size = bios_size; if (isa_bios_size > (128 * 1024)) { isa_bios_size = 128 * 1024; } isa_bios = g_malloc(sizeof(*isa_bios)); memory_region_init_alias(isa_bios, NULL, "isa-bios", bios, bios_size - isa_bios_size, isa_bios_size); memory_region_add_subregion_overlap(rom_memory, 0x100000 - isa_bios_size, isa_bios, 1); if (!isapc_ram_fw) { memory_region_set_readonly(isa_bios, true); } /* map all the bios at the top of memory */ memory_region_add_subregion(rom_memory, (uint32_t)(-bios_size), bios); } void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw) { DriveInfo *pflash_drv; pflash_drv = drive_get(IF_PFLASH, 0, 0); if (isapc_ram_fw || pflash_drv == NULL) { /* When a pflash drive is not found, use rom-mode */ old_pc_system_rom_init(rom_memory, isapc_ram_fw); return; } if (kvm_enabled() && !kvm_readonly_mem_enabled()) { /* Older KVM cannot execute from device memory. So, flash memory * cannot be used unless the readonly memory kvm capability is present. */ fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n"); exit(1); } pc_system_flash_init(rom_memory); }