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 37 void riscv_find_and_load_firmware(MachineState *machine, 38 const char *default_machine_firmware, 39 hwaddr firmware_load_addr, 40 symbol_fn_t sym_cb) 41 { 42 char *firmware_filename = NULL; 43 44 if (!machine->firmware) { 45 /* 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. 50 */ 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 "\ 55 "this happens."); 56 warn_report("See QEMU's deprecation documentation for details."); 57 } 58 return; 59 } 60 61 if (!strcmp(machine->firmware, "default")) { 62 /* 63 * The user has specified "-bios default". That means we are going to 64 * load the OpenSBI binary included in the QEMU source. 65 * 66 * We can't load the binary by default as it will break existing users 67 * as users are already loading their own firmware. 68 * 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. 72 */ 73 firmware_filename = riscv_find_firmware(default_machine_firmware); 74 } else if (strcmp(machine->firmware, "none")) { 75 firmware_filename = riscv_find_firmware(machine->firmware); 76 } 77 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); 82 } 83 } 84 85 char *riscv_find_firmware(const char *firmware_filename) 86 { 87 char *filename; 88 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\"", 92 firmware_filename); 93 exit(1); 94 } 95 96 return filename; 97 } 98 99 target_ulong riscv_load_firmware(const char *firmware_filename, 100 hwaddr firmware_load_addr, 101 symbol_fn_t sym_cb) 102 { 103 uint64_t firmware_entry, firmware_start, firmware_end; 104 105 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; 109 } 110 111 if (load_image_targphys_as(firmware_filename, firmware_load_addr, 112 ram_size, NULL) > 0) { 113 return firmware_load_addr; 114 } 115 116 error_report("could not load firmware '%s'", firmware_filename); 117 exit(1); 118 } 119 120 target_ulong riscv_load_kernel(const char *kernel_filename, symbol_fn_t sym_cb) 121 { 122 uint64_t kernel_entry, kernel_high; 123 124 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) { 127 return kernel_entry; 128 } 129 130 if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL, 131 NULL, NULL, NULL) > 0) { 132 return kernel_entry; 133 } 134 135 if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS, 136 ram_size, NULL) > 0) { 137 return KERNEL_BOOT_ADDRESS; 138 } 139 140 error_report("could not load kernel '%s'", kernel_filename); 141 exit(1); 142 } 143 144 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size, 145 uint64_t kernel_entry, hwaddr *start) 146 { 147 int size; 148 149 /* 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. 159 */ 160 *start = kernel_entry + MIN(mem_size / 2, 128 * MiB); 161 162 size = load_ramdisk(filename, *start, mem_size - *start); 163 if (size == -1) { 164 size = load_image_targphys(filename, *start, mem_size - *start); 165 if (size == -1) { 166 error_report("could not load ramdisk '%s'", filename); 167 exit(1); 168 } 169 } 170 171 return *start + size; 172 } 173