2 * QEMU PC System Firmware
4 * Copyright (c) 2003-2004 Fabrice Bellard
5 * Copyright (c) 2011-2012 Intel Corporation
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:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "sysemu/block-backend.h"
29 #include "qemu/error-report.h"
30 #include "hw/sysbus.h"
32 #include "hw/i386/pc.h"
33 #include "hw/boards.h"
34 #include "hw/loader.h"
35 #include "sysemu/sysemu.h"
36 #include "hw/block/flash.h"
37 #include "sysemu/kvm.h"
39 #define BIOS_FILENAME "bios.bin"
41 typedef struct PcSysFwDevice
{
46 static void pc_isa_bios_init(MemoryRegion
*rom_memory
,
47 MemoryRegion
*flash_mem
,
51 MemoryRegion
*isa_bios
;
53 void *flash_ptr
, *isa_bios_ptr
;
55 flash_size
= memory_region_size(flash_mem
);
57 /* map the last 128KB of the BIOS in ISA space */
58 isa_bios_size
= MIN(flash_size
, 128 * 1024);
59 isa_bios
= g_malloc(sizeof(*isa_bios
));
60 memory_region_init_ram(isa_bios
, NULL
, "isa-bios", isa_bios_size
,
62 memory_region_add_subregion_overlap(rom_memory
,
63 0x100000 - isa_bios_size
,
67 /* copy ISA rom image from top of flash memory */
68 flash_ptr
= memory_region_get_ram_ptr(flash_mem
);
69 isa_bios_ptr
= memory_region_get_ram_ptr(isa_bios
);
71 ((uint8_t*)flash_ptr
) + (flash_size
- isa_bios_size
),
74 memory_region_set_readonly(isa_bios
, true);
77 #define FLASH_MAP_UNIT_MAX 2
79 /* We don't have a theoretically justifiable exact lower bound on the base
80 * address of any flash mapping. In practice, the IO-APIC MMIO range is
81 * [0xFEE00000..0xFEE01000[ -- see IO_APIC_DEFAULT_ADDRESS --, leaving free
82 * only 18MB-4KB below 4G. For now, restrict the cumulative mapping to 8MB in
85 #define FLASH_MAP_BASE_MIN ((hwaddr)(0x100000000ULL - 8*1024*1024))
87 /* This function maps flash drives from 4G downward, in order of their unit
88 * numbers. The mapping starts at unit#0, with unit number increments of 1, and
89 * stops before the first missing flash drive, or before
90 * unit#FLASH_MAP_UNIT_MAX, whichever is reached first.
92 * Addressing within one flash drive is of course not reversed.
94 * An error message is printed and the process exits if:
95 * - the size of the backing file for a flash drive is non-positive, or not a
96 * multiple of the required sector size, or
97 * - the current mapping's base address would fall below FLASH_MAP_BASE_MIN.
99 * The drive with unit#0 (if available) is mapped at the highest address, and
100 * it is passed to pc_isa_bios_init(). Merging several drives for isa-bios is
103 static void pc_system_flash_init(MemoryRegion
*rom_memory
)
106 DriveInfo
*pflash_drv
;
109 char *fatal_errmsg
= NULL
;
110 hwaddr phys_addr
= 0x100000000ULL
;
111 int sector_bits
, sector_size
;
112 pflash_t
*system_flash
;
113 MemoryRegion
*flash_mem
;
117 sector_size
= 1 << sector_bits
;
120 (unit
< FLASH_MAP_UNIT_MAX
&&
121 (pflash_drv
= drive_get(IF_PFLASH
, 0, unit
)) != NULL
);
123 blk
= blk_by_legacy_dinfo(pflash_drv
);
124 size
= blk_getlength(blk
);
126 fatal_errmsg
= g_strdup_printf("failed to get backing file size");
127 } else if (size
== 0) {
128 fatal_errmsg
= g_strdup_printf("PC system firmware (pflash) "
129 "cannot have zero size");
130 } else if ((size
% sector_size
) != 0) {
131 fatal_errmsg
= g_strdup_printf("PC system firmware (pflash) "
132 "must be a multiple of 0x%x", sector_size
);
133 } else if (phys_addr
< size
|| phys_addr
- size
< FLASH_MAP_BASE_MIN
) {
134 fatal_errmsg
= g_strdup_printf("oversized backing file, pflash "
135 "segments cannot be mapped under "
136 TARGET_FMT_plx
, FLASH_MAP_BASE_MIN
);
138 if (fatal_errmsg
!= NULL
) {
141 /* push a new, "none" location on the location stack; overwrite its
142 * contents with the location saved in the option; print the error
143 * (includes location); pop the top
146 if (pflash_drv
->opts
!= NULL
) {
147 qemu_opts_loc_restore(pflash_drv
->opts
);
149 error_report("%s", fatal_errmsg
);
151 g_free(fatal_errmsg
);
157 /* pflash_cfi01_register() creates a deep copy of the name */
158 snprintf(name
, sizeof name
, "system.flash%d", unit
);
159 system_flash
= pflash_cfi01_register(phys_addr
, NULL
/* qdev */, name
,
160 size
, blk
, sector_size
,
169 flash_mem
= pflash_cfi01_get_memory(system_flash
);
170 pc_isa_bios_init(rom_memory
, flash_mem
, size
);
175 static void old_pc_system_rom_init(MemoryRegion
*rom_memory
, bool isapc_ram_fw
)
178 MemoryRegion
*bios
, *isa_bios
;
179 int bios_size
, isa_bios_size
;
183 if (bios_name
== NULL
) {
184 bios_name
= BIOS_FILENAME
;
186 filename
= qemu_find_file(QEMU_FILE_TYPE_BIOS
, bios_name
);
188 bios_size
= get_image_size(filename
);
192 if (bios_size
<= 0 ||
193 (bios_size
% 65536) != 0) {
196 bios
= g_malloc(sizeof(*bios
));
197 memory_region_init_ram(bios
, NULL
, "pc.bios", bios_size
, &error_fatal
);
199 memory_region_set_readonly(bios
, true);
201 ret
= rom_add_file_fixed(bios_name
, (uint32_t)(-bios_size
), -1);
204 fprintf(stderr
, "qemu: could not load PC BIOS '%s'\n", bios_name
);
209 /* map the last 128KB of the BIOS in ISA space */
210 isa_bios_size
= bios_size
;
211 if (isa_bios_size
> (128 * 1024)) {
212 isa_bios_size
= 128 * 1024;
214 isa_bios
= g_malloc(sizeof(*isa_bios
));
215 memory_region_init_alias(isa_bios
, NULL
, "isa-bios", bios
,
216 bios_size
- isa_bios_size
, isa_bios_size
);
217 memory_region_add_subregion_overlap(rom_memory
,
218 0x100000 - isa_bios_size
,
222 memory_region_set_readonly(isa_bios
, true);
225 /* map all the bios at the top of memory */
226 memory_region_add_subregion(rom_memory
,
227 (uint32_t)(-bios_size
),
231 void pc_system_firmware_init(MemoryRegion
*rom_memory
, bool isapc_ram_fw
)
233 DriveInfo
*pflash_drv
;
235 pflash_drv
= drive_get(IF_PFLASH
, 0, 0);
237 if (isapc_ram_fw
|| pflash_drv
== NULL
) {
238 /* When a pflash drive is not found, use rom-mode */
239 old_pc_system_rom_init(rom_memory
, isapc_ram_fw
);
243 if (kvm_enabled() && !kvm_readonly_mem_enabled()) {
244 /* Older KVM cannot execute from device memory. So, flash memory
245 * cannot be used unless the readonly memory kvm capability is present. */
246 fprintf(stderr
, "qemu: pflash with kvm requires KVM readonly memory support\n");
250 pc_system_flash_init(rom_memory
);