riscv: add functions for reading the IPI status
Add the function riscv_get_ipi() for reading the pending status of IPIs. The supported controllers are Andes' Platform Level Interrupt Controller (PLIC), the Supervisor Binary Interface (SBI), and SiFive's Core Local Interruptor (CLINT). Signed-off-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: NRick Chen <rick@andestech.com>
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