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@@ -37,7 +37,26 @@ pub struct Fadt {
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_reserved: u8,
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preferred_pm_profile: u8,
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+ /// On systems with an i8259 PIC, this is the vector the System Control Interrupt (SCI) is wired to. On other systems, this is
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+ /// the Global System Interrupt (GSI) number of the SCI.
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+ ///
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+ /// The SCI should be treated as a sharable, level, active-low interrupt.
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pub sci_interrupt: u16,
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+ /// The system port address of the SMI Command Port. This port should only be accessed from the boot processor.
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+ /// A value of `0` indicates that System Management Mode.
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+ ///
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+ /// - Writing the value in `acpi_enable` to this port will transfer control of the ACPI hardware registers
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+ /// from the firmware to the OS. You must synchronously wait for the transfer to complete, indicated by the
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+ /// setting of `SCI_EN`.
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+ /// - Writing the value in `acpi_disable` will relinquish ownership of the hardware registers to the
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+ /// firmware. This should only be done if you've previously acquired ownership. Before writing this value,
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+ /// the OS should mask all SCI interrupts and clear the `SCI_EN` bit.
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+ /// - Writing the value in `s4bios_req` requests that the firmware enter the S4 state through the S4BIOS
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+ /// feature. This is only supported if the `S4BIOS_F` flag in the FACS is set.
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+ /// - Writing the value in `pstate_control` yields control of the processor performance state to the OS.
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+ /// If this field is `0`, this feature is not supported.
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+ /// - Writing the value in `c_state_control` tells the firmware that the OS supports `_CST` AML objects and
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+ /// notifications of C State changes.
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pub smi_cmd_port: u32,
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pub acpi_enable: u8,
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pub acpi_disable: u8,
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@@ -59,7 +78,11 @@ pub struct Fadt {
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gpe1_block_length: u8,
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pub gpe1_base: u8,
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pub c_state_control: u8,
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+ /// The worst-case latency to enter and exit the C2 state, in microseconds. A value `>100` indicates that the
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+ /// system does not support the C2 state.
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pub worst_c2_latency: u16,
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+ /// The worst-case latency to enter and exit the C3 state, in microseconds. A value `>1000` indicates that the
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+ /// system does not support the C3 state.
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pub worst_c3_latency: u16,
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pub flush_size: u16,
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pub flush_stride: u16,
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Isaac Woods