summaryrefslogtreecommitdiff
path: root/hw/i386/pc_sysfw.c
blob: 579461fa1ed4fd57e73f28ced993532d96e45696 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
/*
 * 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/block-backend.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,
                           &error_fatal);
    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;
    BlockBackend *blk;
    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) {
        blk = blk_by_legacy_dinfo(pflash_drv);
        size = blk_getlength(blk);
        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, blk, 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, &error_fatal);
    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);
    }
    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);
}