/* * QEMU RISC-V Boot Helper * * Copyright (c) 2017 SiFive, Inc. * Copyright (c) 2019 Alistair Francis * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2 or later, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see . */ #include "qemu/osdep.h" #include "qemu-common.h" #include "qemu/units.h" #include "qemu/error-report.h" #include "exec/cpu-defs.h" #include "hw/boards.h" #include "hw/loader.h" #include "hw/riscv/boot.h" #include "elf.h" #include "sysemu/device_tree.h" #include "sysemu/qtest.h" #include #if defined(TARGET_RISCV32) # define KERNEL_BOOT_ADDRESS 0x80400000 #else # define KERNEL_BOOT_ADDRESS 0x80200000 #endif void riscv_find_and_load_firmware(MachineState *machine, const char *default_machine_firmware, hwaddr firmware_load_addr, symbol_fn_t sym_cb) { char *firmware_filename = NULL; if ((!machine->firmware) || (!strcmp(machine->firmware, "default"))) { /* * The user didn't specify -bios, or has specified "-bios default". * That means we are going to load the OpenSBI binary included in * the QEMU source. */ firmware_filename = riscv_find_firmware(default_machine_firmware); } else if (strcmp(machine->firmware, "none")) { firmware_filename = riscv_find_firmware(machine->firmware); } if (firmware_filename) { /* If not "none" load the firmware */ riscv_load_firmware(firmware_filename, firmware_load_addr, sym_cb); g_free(firmware_filename); } } char *riscv_find_firmware(const char *firmware_filename) { char *filename; filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, firmware_filename); if (filename == NULL) { if (!qtest_enabled()) { /* * We only ship plain binary bios images in the QEMU source. * With Spike machine that uses ELF images as the default bios, * running QEMU test will complain hence let's suppress the error * report for QEMU testing. */ error_report("Unable to load the RISC-V firmware \"%s\"", firmware_filename); exit(1); } } return filename; } target_ulong riscv_load_firmware(const char *firmware_filename, hwaddr firmware_load_addr, symbol_fn_t sym_cb) { uint64_t firmware_entry, firmware_start, firmware_end; if (load_elf_ram_sym(firmware_filename, NULL, NULL, NULL, &firmware_entry, &firmware_start, &firmware_end, NULL, 0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { return firmware_entry; } if (load_image_targphys_as(firmware_filename, firmware_load_addr, ram_size, NULL) > 0) { return firmware_load_addr; } error_report("could not load firmware '%s'", firmware_filename); exit(1); } target_ulong riscv_load_kernel(const char *kernel_filename, symbol_fn_t sym_cb) { uint64_t kernel_entry, kernel_high; if (load_elf_ram_sym(kernel_filename, NULL, NULL, NULL, &kernel_entry, NULL, &kernel_high, NULL, 0, EM_RISCV, 1, 0, NULL, true, sym_cb) > 0) { return kernel_entry; } if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL, NULL, NULL, NULL) > 0) { return kernel_entry; } if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS, ram_size, NULL) > 0) { return KERNEL_BOOT_ADDRESS; } error_report("could not load kernel '%s'", kernel_filename); exit(1); } hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size, uint64_t kernel_entry, hwaddr *start) { int size; /* * We want to put the initrd far enough into RAM that when the * kernel is uncompressed it will not clobber the initrd. However * on boards without much RAM we must ensure that we still leave * enough room for a decent sized initrd, and on boards with large * amounts of RAM we must avoid the initrd being so far up in RAM * that it is outside lowmem and inaccessible to the kernel. * So for boards with less than 256MB of RAM we put the initrd * halfway into RAM, and for boards with 256MB of RAM or more we put * the initrd at 128MB. */ *start = kernel_entry + MIN(mem_size / 2, 128 * MiB); size = load_ramdisk(filename, *start, mem_size - *start); if (size == -1) { size = load_image_targphys(filename, *start, mem_size - *start); if (size == -1) { error_report("could not load ramdisk '%s'", filename); exit(1); } } return *start + size; } void riscv_setup_rom_reset_vec(hwaddr start_addr, hwaddr rom_base, hwaddr rom_size, void *fdt) { int i; /* reset vector */ uint32_t reset_vec[8] = { 0x00000297, /* 1: auipc t0, %pcrel_hi(dtb) */ 0x02028593, /* addi a1, t0, %pcrel_lo(1b) */ 0xf1402573, /* csrr a0, mhartid */ #if defined(TARGET_RISCV32) 0x0182a283, /* lw t0, 24(t0) */ #elif defined(TARGET_RISCV64) 0x0182b283, /* ld t0, 24(t0) */ #endif 0x00028067, /* jr t0 */ 0x00000000, start_addr, /* start: .dword */ 0x00000000, /* dtb: */ }; /* copy in the reset vector in little_endian byte order */ for (i = 0; i < sizeof(reset_vec) >> 2; i++) { reset_vec[i] = cpu_to_le32(reset_vec[i]); } rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec), rom_base, &address_space_memory); /* copy in the device tree */ if (fdt_pack(fdt) || fdt_totalsize(fdt) > rom_size - sizeof(reset_vec)) { error_report("not enough space to store device-tree"); exit(1); } qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt)); rom_add_blob_fixed_as("mrom.fdt", fdt, fdt_totalsize(fdt), rom_base + sizeof(reset_vec), &address_space_memory); return; }