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/*
* QEMU RISC-V Boot Helper
*
* Copyright (c) 2017 SiFive, Inc.
* Copyright (c) 2019 Alistair Francis <alistair.francis@wdc.com>
*
* 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 <http://www.gnu.org/licenses/>.
*/
#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/qtest.h"
#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)
{
char *firmware_filename = NULL;
if (!machine->firmware) {
/*
* The user didn't specify -bios.
* At the moment we default to loading nothing when this hapens.
* In the future this defaul will change to loading the prebuilt
* OpenSBI firmware. Let's warn the user and then continue.
*/
if (!qtest_enabled()) {
warn_report("No -bios option specified. Not loading a firmware.");
warn_report("This default will change in a future QEMU release. " \
"Please use the -bios option to avoid breakages when "\
"this happens.");
warn_report("See QEMU's deprecation documentation for details.");
}
return;
}
if (!strcmp(machine->firmware, "default")) {
/*
* The user has specified "-bios default". That means we are going to
* load the OpenSBI binary included in the QEMU source.
*
* We can't load the binary by default as it will break existing users
* as users are already loading their own firmware.
*
* Let's try to get everyone to specify the -bios option at all times,
* so then in the future we can make "-bios default" the default option
* if no -bios option is set without breaking anything.
*/
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);
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) {
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)
{
uint64_t firmware_entry, firmware_start, firmware_end;
if (load_elf(firmware_filename, NULL, NULL, NULL, &firmware_entry,
&firmware_start, &firmware_end, 0, EM_RISCV, 1, 0) > 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)
{
uint64_t kernel_entry, kernel_high;
if (load_elf(kernel_filename, NULL, NULL, NULL,
&kernel_entry, NULL, &kernel_high, 0, EM_RISCV, 1, 0) > 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;
}
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