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 { 41 char *firmware_filename = NULL; 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 = riscv_find_firmware(default_machine_firmware); 73 } else if (strcmp(machine->firmware, "none")) { 74 firmware_filename = riscv_find_firmware(machine->firmware); 75 } 76 77 if (firmware_filename) { 78 /* If not "none" load the firmware */ 79 riscv_load_firmware(firmware_filename, firmware_load_addr); 80 g_free(firmware_filename); 81 } 82 } 83 84 char *riscv_find_firmware(const char *firmware_filename) 85 { 86 char *filename; 87 88 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename); 89 if (filename == NULL) { 90 error_report("Unable to load the RISC-V firmware \"%s\"", 91 firmware_filename); 92 exit(1); 93 } 94 95 return filename; 96 } 97 98 target_ulong riscv_load_firmware(const char *firmware_filename, 99 hwaddr firmware_load_addr) 100 { 101 uint64_t firmware_entry, firmware_start, firmware_end; 102 103 if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry, 104 &firmware_start, &firmware_end, NULL, 0, EM_RISCV, 1, 0) > 0) { 105 return firmware_entry; 106 } 107 108 if (load_image_targphys_as(firmware_filename, firmware_load_addr, 109 ram_size, NULL) > 0) { 110 return firmware_load_addr; 111 } 112 113 error_report("could not load firmware '%s'", firmware_filename); 114 exit(1); 115 } 116 117 target_ulong riscv_load_kernel(const char *kernel_filename, symbol_fn_t sym_cb) 118 { 119 uint64_t kernel_entry, kernel_high; 120 121 if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL, 122 &kernel_entry, NULL, &kernel_high, NULL, 0, 123 EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { 124 return kernel_entry; 125 } 126 127 if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL, 128 NULL, NULL, NULL) > 0) { 129 return kernel_entry; 130 } 131 132 if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS, 133 ram_size, NULL) > 0) { 134 return KERNEL_BOOT_ADDRESS; 135 } 136 137 error_report("could not load kernel '%s'", kernel_filename); 138 exit(1); 139 } 140 141 hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size, 142 uint64_t kernel_entry, hwaddr *start) 143 { 144 int size; 145 146 /* 147 * We want to put the initrd far enough into RAM that when the 148 * kernel is uncompressed it will not clobber the initrd. However 149 * on boards without much RAM we must ensure that we still leave 150 * enough room for a decent sized initrd, and on boards with large 151 * amounts of RAM we must avoid the initrd being so far up in RAM 152 * that it is outside lowmem and inaccessible to the kernel. 153 * So for boards with less than 256MB of RAM we put the initrd 154 * halfway into RAM, and for boards with 256MB of RAM or more we put 155 * the initrd at 128MB. 156 */ 157 *start = kernel_entry + MIN(mem_size / 2, 128 * MiB); 158 159 size = load_ramdisk(filename, *start, mem_size - *start); 160 if (size == -1) { 161 size = load_image_targphys(filename, *start, mem_size - *start); 162 if (size == -1) { 163 error_report("could not load ramdisk '%s'", filename); 164 exit(1); 165 } 166 } 167 168 return *start + size; 169 } 170