[U-Boot] [PATCH 3/7] riscv: implement IPI platform functions using SBI

[Bin Meng]

On Tue, Feb 12, 2019 at 6:14 AM Lukas Auer
<lukas.auer at aisec.fraunhofer.de> wrote:
>
> The supervisor binary interface (SBI) provides the necessary functions
> to implement the platform IPI functions riscv_send_ipi() and
> riscv_clear_ipi(). Use it to implement them.
>
> This adds support for inter-processor interrupts (IPIs) on RISC-V CPUs
> running in supervisor mode. Support for machine mode is already
> available for CPUs that include the SiFive CLINT.
>
> Signed-off-by: Lukas Auer <lukas.auer at aisec.fraunhofer.de>
> ---
>
>  arch/riscv/Kconfig       |  5 +++++
>  arch/riscv/lib/Makefile  |  1 +
>  arch/riscv/lib/sbi_ipi.c | 25 +++++++++++++++++++++++++
>  3 files changed, 31 insertions(+)
>  create mode 100644 arch/riscv/lib/sbi_ipi.c
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>