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/loader.h" 26 #include "hw/riscv/boot.h" 27 #include "hw/boards.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; 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 93 target_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 } 111 112 target_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 } 134 135 hwaddr 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