2 * QEMU RISC-V Boot Helper
4 * Copyright (c) 2017 SiFive, Inc.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2 or later, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
20 #include "qemu/osdep.h"
21 #include "qemu-common.h"
22 #include "qemu/units.h"
23 #include "qemu/error-report.h"
24 #include "exec/cpu-defs.h"
25 #include "hw/boards.h"
26 #include "hw/loader.h"
27 #include "hw/riscv/boot.h"
29 #include "sysemu/qtest.h"
31 #if defined(TARGET_RISCV32)
32 # define KERNEL_BOOT_ADDRESS 0x80400000
34 # define KERNEL_BOOT_ADDRESS 0x80200000
37 void riscv_find_and_load_firmware(MachineState *machine,
38 const char *default_machine_firmware,
39 hwaddr firmware_load_addr,
42 char *firmware_filename = NULL;
44 if (!machine->firmware) {
46 * The user didn't specify -bios.
47 * At the moment we default to loading nothing when this hapens.
48 * In the future this defaul will change to loading the prebuilt
49 * OpenSBI firmware. Let's warn the user and then continue.
51 if (!qtest_enabled()) {
52 warn_report("No -bios option specified. Not loading a firmware.");
53 warn_report("This default will change in a future QEMU release. " \
54 "Please use the -bios option to avoid breakages when "\
56 warn_report("See QEMU's deprecation documentation for details.");
61 if (!strcmp(machine->firmware, "default")) {
63 * The user has specified "-bios default". That means we are going to
64 * load the OpenSBI binary included in the QEMU source.
66 * We can't load the binary by default as it will break existing users
67 * as users are already loading their own firmware.
69 * Let's try to get everyone to specify the -bios option at all times,
70 * so then in the future we can make "-bios default" the default option
71 * if no -bios option is set without breaking anything.
73 firmware_filename = riscv_find_firmware(default_machine_firmware);
74 } else if (strcmp(machine->firmware, "none")) {
75 firmware_filename = riscv_find_firmware(machine->firmware);
78 if (firmware_filename) {
79 /* If not "none" load the firmware */
80 riscv_load_firmware(firmware_filename, firmware_load_addr, sym_cb);
81 g_free(firmware_filename);
85 char *riscv_find_firmware(const char *firmware_filename)
89 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename);
90 if (filename == NULL) {
91 error_report("Unable to load the RISC-V firmware \"%s\"",
99 target_ulong riscv_load_firmware(const char *firmware_filename,
100 hwaddr firmware_load_addr,
103 uint64_t firmware_entry, firmware_start, firmware_end;
105 if (load_elf_ram_sym(firmware_filename, NULL, NULL, NULL,
106 &firmware_entry, &firmware_start, &firmware_end, NULL,
107 0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) {
108 return firmware_entry;
111 if (load_image_targphys_as(firmware_filename, firmware_load_addr,
112 ram_size, NULL) > 0) {
113 return firmware_load_addr;
116 error_report("could not load firmware '%s'", firmware_filename);
120 target_ulong riscv_load_kernel(const char *kernel_filename, symbol_fn_t sym_cb)
122 uint64_t kernel_entry, kernel_high;
124 if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL,
125 &kernel_entry, NULL, &kernel_high, NULL, 0,
126 EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) {
130 if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
131 NULL, NULL, NULL) > 0) {
135 if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
136 ram_size, NULL) > 0) {
137 return KERNEL_BOOT_ADDRESS;
140 error_report("could not load kernel '%s'", kernel_filename);
144 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
145 uint64_t kernel_entry, hwaddr *start)
150 * We want to put the initrd far enough into RAM that when the
151 * kernel is uncompressed it will not clobber the initrd. However
152 * on boards without much RAM we must ensure that we still leave
153 * enough room for a decent sized initrd, and on boards with large
154 * amounts of RAM we must avoid the initrd being so far up in RAM
155 * that it is outside lowmem and inaccessible to the kernel.
156 * So for boards with less than 256MB of RAM we put the initrd
157 * halfway into RAM, and for boards with 256MB of RAM or more we put
158 * the initrd at 128MB.
160 *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
162 size = load_ramdisk(filename, *start, mem_size - *start);
164 size = load_image_targphys(filename, *start, mem_size - *start);
166 error_report("could not load ramdisk '%s'", filename);
171 return *start + size;