252 lines
9.1 KiB
C
252 lines
9.1 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 "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 "hw/sysbus.h"
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#include "hw/hw.h"
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#include "hw/i386/pc.h"
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#include "hw/boards.h"
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#include "hw/loader.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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#define BIOS_FILENAME "bios.bin"
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typedef struct PcSysFwDevice {
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SysBusDevice busdev;
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uint8_t isapc_ram_fw;
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} PcSysFwDevice;
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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 * 1024);
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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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#define FLASH_MAP_UNIT_MAX 2
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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_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
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/* This function maps flash drives from 4G downward, in order of their unit
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* numbers. The mapping starts at unit#0, with unit number increments of 1, and
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* stops before the first missing flash drive, or before
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* unit#FLASH_MAP_UNIT_MAX, whichever is reached first.
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*
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* Addressing within one flash drive is of course not reversed.
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*
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* An error message is printed and the process exits if:
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* - the size of the backing file for a flash drive is non-positive, or not a
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* multiple of the required sector size, or
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* - the current mapping's base address would fall below FLASH_MAP_BASE_MIN.
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*
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* The drive with unit#0 (if available) is mapped at the highest address, and
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* it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is
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* not supported.
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*/
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static void pc_system_flash_init(MemoryRegion *rom_memory)
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{
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int unit;
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DriveInfo *pflash_drv;
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BlockBackend *blk;
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int64_t size;
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char *fatal_errmsg = NULL;
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hwaddr phys_addr = 0x100000000ULL;
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int sector_bits, sector_size;
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pflash_t *system_flash;
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MemoryRegion *flash_mem;
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char name[64];
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sector_bits = 12;
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sector_size = 1 << sector_bits;
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for (unit = 0;
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(unit < FLASH_MAP_UNIT_MAX &&
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(pflash_drv = drive_get(IF_PFLASH, 0, unit)) != NULL);
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++unit) {
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blk = blk_by_legacy_dinfo(pflash_drv);
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size = blk_getlength(blk);
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if (size < 0) {
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fatal_errmsg = g_strdup_printf("failed to get backing file size");
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} else if (size == 0) {
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fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
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"cannot have zero size");
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} else if ((size % sector_size) != 0) {
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fatal_errmsg = g_strdup_printf("PC system firmware (pflash) "
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"must be a multiple of 0x%x", sector_size);
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} else if (phys_addr < size || phys_addr - size < FLASH_MAP_BASE_MIN) {
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fatal_errmsg = g_strdup_printf("oversized backing file, pflash "
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"segments cannot be mapped under "
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TARGET_FMT_plx, FLASH_MAP_BASE_MIN);
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}
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if (fatal_errmsg != NULL) {
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Location loc;
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/* push a new, "none" location on the location stack; overwrite its
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* contents with the location saved in the option; print the error
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* (includes location); pop the top
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*/
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loc_push_none(&loc);
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if (pflash_drv->opts != NULL) {
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qemu_opts_loc_restore(pflash_drv->opts);
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}
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error_report("%s", fatal_errmsg);
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loc_pop(&loc);
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g_free(fatal_errmsg);
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exit(1);
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}
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phys_addr -= size;
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/* pflash_cfi01_register() creates a deep copy of the name */
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snprintf(name, sizeof name, "system.flash%d", unit);
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system_flash = pflash_cfi01_register(phys_addr, NULL /* qdev */, name,
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size, blk, sector_size,
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size >> sector_bits,
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1 /* width */,
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0x0000 /* id0 */,
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0x0000 /* id1 */,
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0x0000 /* id2 */,
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0x0000 /* id3 */,
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0 /* be */);
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if (unit == 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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}
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}
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}
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static void old_pc_system_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
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{
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char *filename;
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MemoryRegion *bios, *isa_bios;
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int bios_size, isa_bios_size;
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int ret;
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/* BIOS load */
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if (bios_name == NULL) {
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bios_name = BIOS_FILENAME;
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}
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filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
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if (filename) {
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bios_size = get_image_size(filename);
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} else {
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bios_size = -1;
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}
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if (bios_size <= 0 ||
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(bios_size % 65536) != 0) {
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goto bios_error;
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}
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bios = g_malloc(sizeof(*bios));
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memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
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if (!isapc_ram_fw) {
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memory_region_set_readonly(bios, true);
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}
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ret = rom_add_file_fixed(bios_name, (uint32_t)(-bios_size), -1);
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if (ret != 0) {
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bios_error:
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fprintf(stderr, "qemu: could not load PC BIOS '%s'\n", bios_name);
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exit(1);
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}
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g_free(filename);
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/* map the last 128KB of the BIOS in ISA space */
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isa_bios_size = bios_size;
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if (isa_bios_size > (128 * 1024)) {
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isa_bios_size = 128 * 1024;
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}
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isa_bios = g_malloc(sizeof(*isa_bios));
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memory_region_init_alias(isa_bios, NULL, "isa-bios", bios,
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bios_size - isa_bios_size, isa_bios_size);
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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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if (!isapc_ram_fw) {
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memory_region_set_readonly(isa_bios, true);
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}
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/* map all the bios at the top of memory */
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memory_region_add_subregion(rom_memory,
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(uint32_t)(-bios_size),
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bios);
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}
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void pc_system_firmware_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
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{
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DriveInfo *pflash_drv;
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pflash_drv = drive_get(IF_PFLASH, 0, 0);
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if (isapc_ram_fw || pflash_drv == NULL) {
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/* When a pflash drive is not found, use rom-mode */
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old_pc_system_rom_init(rom_memory, isapc_ram_fw);
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return;
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}
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if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
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/* Older KVM cannot execute from device memory. So, flash memory
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* cannot be used unless the readonly memory kvm capability is present. */
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fprintf(stderr, "qemu: pflash with kvm requires KVM readonly memory support\n");
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exit(1);
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}
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pc_system_flash_init(rom_memory);
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}
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