Re: [Qemu-devel] [Qemu-riscv] [RFC v1 5/5] hw/riscv: Load OpenSBI as the default firmware

[Anup Patel <anup@brainfault.org>]

On Wed, Jun 19, 2019 at 6:21 AM Alistair Francis
<alistair.francis@wdc.com> wrote:
>
> 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>
> ---
>  hw/riscv/boot.c         | 28 ++++++++++++++++++++++++++++
>  hw/riscv/sifive_u.c     |  4 +---
>  hw/riscv/virt.c         |  4 +---
>  include/hw/riscv/boot.h |  1 +
>  4 files changed, 31 insertions(+), 6 deletions(-)
>
> diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c
> index 7f68035a3f..5f021591ed 100644
> --- a/hw/riscv/boot.c
> +++ b/hw/riscv/boot.c
> @@ -18,6 +18,7 @@
>   */
>
>  #include "qemu/osdep.h"
> +#include "qemu-common.h"
>  #include "qemu/units.h"
>  #include "qemu/error-report.h"
>  #include "exec/cpu-defs.h"
> @@ -32,6 +33,12 @@
>  # define KERNEL_BOOT_ADDRESS 0x80200000
>  #endif
>
> +#if defined(TARGET_RISCV32)
> +# define BIOS_FILENAME "opensbi-riscv32-fw_jump.elf"
> +#else
> +# define BIOS_FILENAME "opensbi-riscv64-fw_jump.elf"
> +#endif

Based on my comment on PATCH4, BIOS_FILENAME should
be derived from QEMU machine name and TARGET_RISCVx

Agree ??

Regards,
Anup

> +
>  static uint64_t kernel_translate(void *opaque, uint64_t addr)
>  {
>      MachineState *machine = opaque;
> @@ -47,6 +54,27 @@ static uint64_t kernel_translate(void *opaque, uint64_t addr)
>      }
>  }
>
> +void riscv_find_and_load_firmware(MachineState *machine)
> +{
> +    char *firmware_filename;
> +
> +    if (!machine->firmware) {
> +        /* The user didn't specify a firmware, default to OpenSBI */
> +        firmware_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, BIOS_FILENAME);
> +    } else {
> +        firmware_filename = machine->firmware;
> +    }
> +
> +    if (strcmp(firmware_filename, "none")) {
> +        /* If not "none" load the firmware */
> +        riscv_load_firmware(firmware_filename);
> +    }
> +
> +    if (!machine->firmware) {
> +        g_free(firmware_filename);
> +    }
> +}
> +
>  target_ulong riscv_load_firmware(const char *firmware_filename)
>  {
>      uint64_t firmware_entry, firmware_start, firmware_end;
> diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
> index 03a6c64d04..77666d0f4d 100644
> --- a/hw/riscv/sifive_u.c
> +++ b/hw/riscv/sifive_u.c
> @@ -266,9 +266,7 @@ static void riscv_sifive_u_init(MachineState *machine)
>      /* create device tree */
>      create_fdt(s, memmap, machine->ram_size, machine->kernel_cmdline);
>
> -    if (machine->firmware) {
> -        riscv_load_firmware(machine->firmware);
> -    }
> +    riscv_find_and_load_firmware(machine);
>
>      if (machine->kernel_filename) {
>          riscv_load_kernel(machine, machine->kernel_filename);
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index d3670b5a7c..2a7e850666 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -380,9 +380,7 @@ static void riscv_virt_board_init(MachineState *machine)
>      memory_region_add_subregion(system_memory, memmap[VIRT_MROM].base,
>                                  mask_rom);
>
> -    if (machine->firmware) {
> -        riscv_load_firmware(machine->firmware);
> -    }
> +    riscv_find_and_load_firmware(machine);
>
>      if (machine->kernel_filename) {
>          uint64_t kernel_entry = riscv_load_kernel(machine,
> diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h
> index 6f586939c7..df2e2480e6 100644
> --- a/include/hw/riscv/boot.h
> +++ b/include/hw/riscv/boot.h
> @@ -20,6 +20,7 @@
>  #ifndef RISCV_BOOT_H
>  #define RISCV_BOOT_H
>
> +void riscv_find_and_load_firmware(MachineState *machine);
>  target_ulong riscv_load_firmware(const char *firmware_filename);
>  target_ulong riscv_load_kernel(MachineState *machine,
>                                 const char *kernel_filename);
> --
> 2.22.0
>
>