sbi-rt 0.0.4

Runtime library for supervisors to call RISC-V Supervisor Binary Interface (RISC-V SBI)
Documentation 
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//! Chapter 7. IPI Extension (EID #0x735049 "sPI: s-mode IPI")

use crate::binary::sbi_call_2;

use sbi_spec::{
    binary::{HartMask, SbiRet},
    spi::{EID_SPI, SEND_IPI},
};

/// Send an inter-processor interrupt to all harts defined in hart mask.
///
/// Inter-processor interrupts manifest at the receiving harts as the supervisor software interrupts.
///
/// # Return value
///
/// The possible return error codes returned in `SbiRet.error` are shown in the table below:
///
/// | Return code               | Description
/// |:--------------------------|:----------------------------------------------
/// | `SbiRet::success()`       | IPI was sent to all the targeted harts successfully.
/// | `SbiRet::invalid_param()` | At least one hartid constructed from `hart_mask`, is not valid, i.e. either the hartid is not enabled by the platform or is not available to the supervisor.
/// | `SbiRet::failed()`        | The request failed for unspecified or unknown other reasons.
///
/// This function is defined in RISC-V SBI Specification chapter 7.1.
#[inline]
#[doc(alias = "sbi_send_ipi")]
pub fn send_ipi(hart_mask: HartMask) -> SbiRet {
    let (hart_mask, hart_mask_base) = hart_mask.into_inner();
    sbi_call_2(EID_SPI, SEND_IPI, hart_mask, hart_mask_base)
}