262 lines
9 KiB
C
262 lines
9 KiB
C
/*
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* QEMU PC System Firmware
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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* Copyright (c) 2011-2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qapi/error.h"
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#include "sysemu/block-backend.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
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#include "qemu/units.h"
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#include "hw/sysbus.h"
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#include "hw/i386/x86.h"
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#include "hw/i386/pc.h"
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#include "hw/loader.h"
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#include "hw/qdev-properties.h"
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#include "sysemu/sysemu.h"
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#include "hw/block/flash.h"
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#include "sysemu/kvm.h"
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/*
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* We don't have a theoretically justifiable exact lower bound on the base
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* address of any flash mapping. In practice, the IO-APIC MMIO range is
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* [0xFEE00000..0xFEE01000] -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
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* only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
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* size.
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*/
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#define FLASH_SIZE_LIMIT (8 * MiB)
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#define FLASH_SECTOR_SIZE 4096
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static void pc_isa_bios_init(MemoryRegion *rom_memory,
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MemoryRegion *flash_mem,
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int ram_size)
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{
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int isa_bios_size;
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MemoryRegion *isa_bios;
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uint64_t flash_size;
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void *flash_ptr, *isa_bios_ptr;
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flash_size = memory_region_size(flash_mem);
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/* map the last 128KB of the BIOS in ISA space */
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isa_bios_size = MIN(flash_size, 128 * KiB);
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isa_bios = g_malloc(sizeof(*isa_bios));
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memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size,
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&error_fatal);
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memory_region_add_subregion_overlap(rom_memory,
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0x100000 - isa_bios_size,
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isa_bios,
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1);
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/* copy ISA rom image from top of flash memory */
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flash_ptr = memory_region_get_ram_ptr(flash_mem);
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isa_bios_ptr = memory_region_get_ram_ptr(isa_bios);
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memcpy(isa_bios_ptr,
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((uint8_t*)flash_ptr) + (flash_size - isa_bios_size),
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isa_bios_size);
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memory_region_set_readonly(isa_bios, true);
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}
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static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms,
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const char *name,
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const char *alias_prop_name)
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{
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DeviceState *dev = qdev_new(TYPE_PFLASH_CFI01);
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qdev_prop_set_uint64(dev, "sector-length", FLASH_SECTOR_SIZE);
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qdev_prop_set_uint8(dev, "width", 1);
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qdev_prop_set_string(dev, "name", name);
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object_property_add_child(OBJECT(pcms), name, OBJECT(dev));
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object_property_add_alias(OBJECT(pcms), alias_prop_name,
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OBJECT(dev), "drive");
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/*
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* The returned reference is tied to the child property and
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* will be removed with object_unparent.
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*/
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object_unref(OBJECT(dev));
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return PFLASH_CFI01(dev);
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}
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void pc_system_flash_create(PCMachineState *pcms)
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{
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PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
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if (pcmc->pci_enabled) {
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pcms->flash[0] = pc_pflash_create(pcms, "system.flash0",
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"pflash0");
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pcms->flash[1] = pc_pflash_create(pcms, "system.flash1",
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"pflash1");
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}
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}
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void pc_system_flash_cleanup_unused(PCMachineState *pcms)
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{
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char *prop_name;
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int i;
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Object *dev_obj;
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assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
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for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
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dev_obj = OBJECT(pcms->flash[i]);
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if (!object_property_get_bool(dev_obj, "realized", &error_abort)) {
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prop_name = g_strdup_printf("pflash%d", i);
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object_property_del(OBJECT(pcms), prop_name);
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g_free(prop_name);
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object_unparent(dev_obj);
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pcms->flash[i] = NULL;
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}
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}
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}
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/*
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* Map the pcms->flash[] from 4GiB downward, and realize.
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* Map them in descending order, i.e. pcms->flash[0] at the top,
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* without gaps.
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* Stop at the first pcms->flash[0] lacking a block backend.
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* Set each flash's size from its block backend. Fatal error if the
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* size isn't a non-zero multiple of 4KiB, or the total size exceeds
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* FLASH_SIZE_LIMIT.
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*
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* If pcms->flash[0] has a block backend, its memory is passed to
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* pc_isa_bios_init(). Merging several flash devices for isa-bios is
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* not supported.
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*/
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static void pc_system_flash_map(PCMachineState *pcms,
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MemoryRegion *rom_memory)
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{
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hwaddr total_size = 0;
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int i;
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BlockBackend *blk;
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int64_t size;
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PFlashCFI01 *system_flash;
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MemoryRegion *flash_mem;
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void *flash_ptr;
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int ret, flash_size;
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assert(PC_MACHINE_GET_CLASS(pcms)->pci_enabled);
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for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
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system_flash = pcms->flash[i];
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blk = pflash_cfi01_get_blk(system_flash);
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if (!blk) {
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break;
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}
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size = blk_getlength(blk);
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if (size < 0) {
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error_report("can't get size of block device %s: %s",
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blk_name(blk), strerror(-size));
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exit(1);
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}
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if (size == 0 || !QEMU_IS_ALIGNED(size, FLASH_SECTOR_SIZE)) {
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error_report("system firmware block device %s has invalid size "
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"%" PRId64,
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blk_name(blk), size);
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info_report("its size must be a non-zero multiple of 0x%x",
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FLASH_SECTOR_SIZE);
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exit(1);
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}
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if ((hwaddr)size != size
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|| total_size > HWADDR_MAX - size
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|| total_size + size > FLASH_SIZE_LIMIT) {
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error_report("combined size of system firmware exceeds "
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"%" PRIu64 " bytes",
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FLASH_SIZE_LIMIT);
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exit(1);
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}
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total_size += size;
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qdev_prop_set_uint32(DEVICE(system_flash), "num-blocks",
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size / FLASH_SECTOR_SIZE);
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sysbus_realize_and_unref(SYS_BUS_DEVICE(system_flash), &error_fatal);
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sysbus_mmio_map(SYS_BUS_DEVICE(system_flash), 0,
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0x100000000ULL - total_size);
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if (i == 0) {
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flash_mem = pflash_cfi01_get_memory(system_flash);
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pc_isa_bios_init(rom_memory, flash_mem, size);
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/* Encrypt the pflash boot ROM */
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if (kvm_memcrypt_enabled()) {
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flash_ptr = memory_region_get_ram_ptr(flash_mem);
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flash_size = memory_region_size(flash_mem);
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ret = kvm_memcrypt_encrypt_data(flash_ptr, flash_size);
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if (ret) {
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error_report("failed to encrypt pflash rom");
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exit(1);
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}
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}
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}
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}
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}
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void pc_system_firmware_init(PCMachineState *pcms,
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MemoryRegion *rom_memory)
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{
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PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
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int i;
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BlockBackend *pflash_blk[ARRAY_SIZE(pcms->flash)];
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if (!pcmc->pci_enabled) {
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x86_bios_rom_init(rom_memory, true);
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return;
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}
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/* Map legacy -drive if=pflash to machine properties */
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for (i = 0; i < ARRAY_SIZE(pcms->flash); i++) {
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pflash_cfi01_legacy_drive(pcms->flash[i],
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drive_get(IF_PFLASH, 0, i));
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pflash_blk[i] = pflash_cfi01_get_blk(pcms->flash[i]);
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}
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/* Reject gaps */
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for (i = 1; i < ARRAY_SIZE(pcms->flash); i++) {
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if (pflash_blk[i] && !pflash_blk[i - 1]) {
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error_report("pflash%d requires pflash%d", i, i - 1);
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exit(1);
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}
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}
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if (!pflash_blk[0]) {
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/* Machine property pflash0 not set, use ROM mode */
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x86_bios_rom_init(rom_memory, false);
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} else {
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if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
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/*
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* Older KVM cannot execute from device memory. So, flash
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* memory cannot be used unless the readonly memory kvm
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* capability is present.
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*/
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error_report("pflash with kvm requires KVM readonly memory support");
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exit(1);
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}
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pc_system_flash_map(pcms, rom_memory);
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}
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pc_system_flash_cleanup_unused(pcms);
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}
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