1/*
2 * QEMU RISC-V Boot Helper
3 *
4 * Copyright (c) 2017 SiFive, Inc.
5 * Copyright (c) 2019 Alistair Francis <alistair.francis@wdc.com>
6 *
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.
10 *
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
14 * more details.
15 *
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/>.
18 */
19
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"
28#include "elf.h"
29#include "sysemu/qtest.h"
30
31#if defined(TARGET_RISCV32)
32# define KERNEL_BOOT_ADDRESS 0x80400000
33#else
34# define KERNEL_BOOT_ADDRESS 0x80200000
35#endif
36
37void riscv_find_and_load_firmware(MachineState *machine,
38 const char *default_machine_firmware,
39 hwaddr firmware_load_addr)
40{
41 char *firmware_filename;
42
43 if (!machine->firmware) {
44 /*
45 * The user didn't specify -bios.
46 * At the moment we default to loading nothing when this hapens.
47 * In the future this defaul will change to loading the prebuilt
48 * OpenSBI firmware. Let's warn the user and then continue.
49 */
50 if (!qtest_enabled()) {
51 warn_report("No -bios option specified. Not loading a firmware.");
52 warn_report("This default will change in a future QEMU release. " \
53 "Please use the -bios option to avoid breakages when "\
54 "this happens.");
55 warn_report("See QEMU's deprecation documentation for details.");
56 }
57 return;
58 }
59
60 if (!strcmp(machine->firmware, "default")) {
61 /*
62 * The user has specified "-bios default". That means we are going to
63 * load the OpenSBI binary included in the QEMU source.
64 *
65 * We can't load the binary by default as it will break existing users
66 * as users are already loading their own firmware.
67 *
68 * Let's try to get everyone to specify the -bios option at all times,
69 * so then in the future we can make "-bios default" the default option
70 * if no -bios option is set without breaking anything.
71 */
72 firmware_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
73 default_machine_firmware);
74 if (firmware_filename == NULL) {
75 error_report("Unable to load the default RISC-V firmware \"%s\"",
76 default_machine_firmware);
77 exit(1);
78 }
79 } else {
80 firmware_filename = machine->firmware;
81 }
82
83 if (strcmp(firmware_filename, "none")) {
84 /* If not "none" load the firmware */
85 riscv_load_firmware(firmware_filename, firmware_load_addr);
86 }
87
88 if (!strcmp(machine->firmware, "default")) {
89 g_free(firmware_filename);
90 }
91}
92
93target_ulong riscv_load_firmware(const char *firmware_filename,
94 hwaddr firmware_load_addr)
95{
96 uint64_t firmware_entry, firmware_start, firmware_end;
97
98 if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
99 &firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 0) {
100 return firmware_entry;
101 }
102
103 if (load_image_targphys_as(firmware_filename, firmware_load_addr,
104 ram_size, NULL) > 0) {
105 return firmware_load_addr;
106 }
107
108 error_report("could not load firmware '%s'", firmware_filename);
109 exit(1);
110}
111
112target_ulong riscv_load_kernel(const char *kernel_filename)
113{
114 uint64_t kernel_entry, kernel_high;
115
116 if (load_elf(kernel_filename, NULL, NULL, NULL,
117 &kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 0) {
118 return kernel_entry;
119 }
120
121 if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
122 NULL, NULL, NULL) > 0) {
123 return kernel_entry;
124 }
125
126 if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
127 ram_size, NULL) > 0) {
128 return KERNEL_BOOT_ADDRESS;
129 }
130
131 error_report("could not load kernel '%s'", kernel_filename);
132 exit(1);
133}
134
135hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
136 uint64_t kernel_entry, hwaddr *start)
137{
138 int size;
139
140 /*
141 * We want to put the initrd far enough into RAM that when the
142 * kernel is uncompressed it will not clobber the initrd. However
143 * on boards without much RAM we must ensure that we still leave
144 * enough room for a decent sized initrd, and on boards with large
145 * amounts of RAM we must avoid the initrd being so far up in RAM
146 * that it is outside lowmem and inaccessible to the kernel.
147 * So for boards with less than 256MB of RAM we put the initrd
148 * halfway into RAM, and for boards with 256MB of RAM or more we put
149 * the initrd at 128MB.
150 */
151 *start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
152
153 size = load_ramdisk(filename, *start, mem_size - *start);
154 if (size == -1) {
155 size = load_image_targphys(filename, *start, mem_size - *start);
156 if (size == -1) {
157 error_report("could not load ramdisk '%s'", filename);
158 exit(1);
159 }
160 }
161
162 return *start + size;
163}
164