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This extension [1] allows to deliver events from SBI to supervisor via a software mechanism. This extension defines events (either local or global) which are signaled by the SBI on specific signal sources (IRQ, exceptions, etc) and are injected to be executed in supervisor mode. [1] https://lists.riscv.org/g/tech-prs/message/798 Signed-off-by: Clément Léger <cleger@rivosinc.com> Reviewed-by: Himanshu Chauhan <hchauhan@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>