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devices: vmm: Add ACPI PM timer

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This is a counter exposed via an I/O port that runs at 3.579545MHz. Here
we use a hardcoded I/O and expose the details through the FADT table.

TEST=Boot Linux kernel and see the following in dmesg:

[    0.506198] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2020-07-23 10:17:07 +01:00
parent 4fc7eb3daa
commit aae5d988e1
4 changed files with 64 additions and 3 deletions
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devices/src/lib.rs
+1 -1
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@@ -39,7 +39,7 @@ pub mod ioapic;
pub mod legacy;
#[cfg(feature = "acpi")]
pub use self::acpi::{AcpiGEDDevice, AcpiShutdownDevice};
pub use self::acpi::{AcpiGEDDevice, AcpiPMTimerDevice, AcpiShutdownDevice};
pub use self::bus::{Bus, BusDevice, Error as BusError};
pub type DeviceEventT = u16;