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efi: Implement reset_system for Cloud Hypervisor #423

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efi: Implement reset_system for Cloud Hypervisor #423

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26 changes: 24 additions & 2 deletions src/efi/runtime_services.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -196,8 +196,30 @@ pub extern "efiapi" fn get_next_high_mono_count(_: *mut u32) -> Status {
Status::DEVICE_ERROR
}

pub extern "efiapi" fn reset_system(_: ResetType, _: Status, _: usize, _: *mut c_void) {
// Don't do anything to force the kernel to use ACPI for shutdown and triple-fault for reset
pub extern "efiapi" fn reset_system(_reset_type: ResetType, _: Status, _: usize, _: *mut c_void) {
#[cfg(target_arch = "x86_64")]
{
// Cloud Hypervisor's AcpiShutdownDevice is at IO port 0x600.
const SHUTDOWN_PORT: u16 = 0x600;
const S5_SLEEP_VALUE: u8 = (5 << 2) | (1 << 5); // SLP_TYP=5, SLP_EN=1
const REBOOT_VALUE: u8 = 1;

let value = if _reset_type == efi::RESET_SHUTDOWN {
S5_SLEEP_VALUE
} else {
REBOOT_VALUE
};
unsafe {
core::arch::asm!("out dx, al", in("dx") SHUTDOWN_PORT, in("al") value);
}
}

loop {
#[cfg(target_arch = "x86_64")]
unsafe {
core::arch::asm!("hlt");
}
}
}

pub extern "efiapi" fn update_capsule(
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