If the user hasn't specified a firmware to load (with -bios) or specified no bios (with -bios none) then load OpenSBI by default. This allows users to boot a RISC-V kernel with just -kernel. Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
160 lines
5.5 KiB
C
160 lines
5.5 KiB
C
/*
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* QEMU RISC-V Boot Helper
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*
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* Copyright (c) 2017 SiFive, Inc.
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* Copyright (c) 2019 Alistair Francis <alistair.francis@wdc.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/units.h"
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#include "qemu/error-report.h"
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#include "exec/cpu-defs.h"
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#include "hw/loader.h"
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#include "hw/riscv/boot.h"
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#include "hw/boards.h"
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#include "elf.h"
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#if defined(TARGET_RISCV32)
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# define KERNEL_BOOT_ADDRESS 0x80400000
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#else
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# define KERNEL_BOOT_ADDRESS 0x80200000
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#endif
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void riscv_find_and_load_firmware(MachineState *machine,
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const char *default_machine_firmware,
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hwaddr firmware_load_addr)
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{
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char *firmware_filename;
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if (!machine->firmware) {
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/*
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* The user didn't specify -bios.
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* At the moment we default to loading nothing when this hapens.
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* In the future this defaul will change to loading the prebuilt
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* OpenSBI firmware. Let's warn the user and then continue.
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*/
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warn_report("No -bios option specified. Not loading a firmware.");
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warn_report("This default will change in QEMU 4.3. Please use the " \
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"-bios option to aviod breakages when this happens.");
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warn_report("See QEMU's deprecation documentation for details");
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return;
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}
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if (!strcmp(machine->firmware, "default")) {
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/*
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* The user has specified "-bios default". That means we are going to
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* load the OpenSBI binary included in the QEMU source.
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*
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* We can't load the binary by default as it will break existing users
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* as users are already loading their own firmware.
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*
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* Let's try to get everyone to specify the -bios option at all times,
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* so then in the future we can make "-bios default" the default option
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* if no -bios option is set without breaking anything.
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*/
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firmware_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS,
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default_machine_firmware);
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if (firmware_filename == NULL) {
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error_report("Unable to load the default RISC-V firmware \"%s\"",
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default_machine_firmware);
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exit(1);
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}
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} else {
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firmware_filename = machine->firmware;
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}
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if (strcmp(firmware_filename, "none")) {
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/* If not "none" load the firmware */
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riscv_load_firmware(firmware_filename, firmware_load_addr);
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}
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if (!strcmp(machine->firmware, "default")) {
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g_free(firmware_filename);
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}
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}
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target_ulong riscv_load_firmware(const char *firmware_filename,
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hwaddr firmware_load_addr)
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{
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uint64_t firmware_entry, firmware_start, firmware_end;
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if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
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&firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 0) {
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return firmware_entry;
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}
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if (load_image_targphys_as(firmware_filename, firmware_load_addr,
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ram_size, NULL) > 0) {
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return firmware_load_addr;
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}
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error_report("could not load firmware '%s'", firmware_filename);
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exit(1);
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}
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target_ulong riscv_load_kernel(const char *kernel_filename)
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{
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uint64_t kernel_entry, kernel_high;
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if (load_elf(kernel_filename, NULL, NULL, NULL,
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&kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 0) {
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return kernel_entry;
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}
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if (load_uimage_as(kernel_filename, &kernel_entry, NULL, NULL,
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NULL, NULL, NULL) > 0) {
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return kernel_entry;
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}
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if (load_image_targphys_as(kernel_filename, KERNEL_BOOT_ADDRESS,
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ram_size, NULL) > 0) {
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return KERNEL_BOOT_ADDRESS;
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}
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error_report("could not load kernel '%s'", kernel_filename);
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exit(1);
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}
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hwaddr riscv_load_initrd(const char *filename, uint64_t mem_size,
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uint64_t kernel_entry, hwaddr *start)
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{
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int size;
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/*
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* We want to put the initrd far enough into RAM that when the
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* kernel is uncompressed it will not clobber the initrd. However
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* on boards without much RAM we must ensure that we still leave
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* enough room for a decent sized initrd, and on boards with large
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* amounts of RAM we must avoid the initrd being so far up in RAM
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* that it is outside lowmem and inaccessible to the kernel.
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* So for boards with less than 256MB of RAM we put the initrd
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* halfway into RAM, and for boards with 256MB of RAM or more we put
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* the initrd at 128MB.
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*/
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*start = kernel_entry + MIN(mem_size / 2, 128 * MiB);
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size = load_ramdisk(filename, *start, mem_size - *start);
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if (size == -1) {
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size = load_image_targphys(filename, *start, mem_size - *start);
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if (size == -1) {
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error_report("could not load ramdisk '%s'", filename);
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exit(1);
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}
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}
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return *start + size;
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}
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