qemu/hw/riscv/boot.c
Bin Meng 087a424674 riscv: Change the default behavior if no -bios option is specified
Per QEMU deprecated doc, QEMU 4.1 introduced support for the -bios
option in QEMU for RISC-V for the virt machine and sifive_u machine.
The default behavior has been that QEMU does not automatically load
any firmware if no -bios option is included.

Now 2 releases passed, it's time to change the default behavior to
load the default OpenSBI firmware automatically. The firmware is
included with the QEMU release and no user interaction is required.
All a user needs to do is specify the kernel they want to boot with
the -kernel option.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 1588335545-649-1-git-send-email-bmeng.cn@gmail.com
Message-Id: <1588335545-649-1-git-send-email-bmeng.cn@gmail.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2020-06-03 09:11:51 -07:00

158 lines
5.2 KiB
C

/*
* 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,
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;
}