riscv: implement IPI platform functions using SBI
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: NLukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: NAnup Patel <anup.patel@wdc.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NAtish Patra <atish.patra@wdc.com> Tested-by: NBin Meng <bmeng.cn@gmail.com>
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arch/riscv/lib/sbi_ipi.c
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