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rust/timer/hpet: define hpet_fw_cfg

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Define HPETFwEntry structure with the same memory layout as
hpet_fw_entry in C.

Further, define the global hpet_cfg variable in Rust which is the
same as the C version. This hpet_cfg variable in Rust will replace
the C version one and allows both Rust code and C code to access it.

The Rust version of hpet_cfg is self-contained, avoiding unsafe
access to C code.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-8-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Zhao Liu 2025-02-10 11:00:48 +08:00 • committed by Paolo Bonzini
parent eadb83f9a3
commit 0534248a6b
9 changed files with 132 additions and 2 deletions
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6
rust/qemu-api/src/zeroable.rs
View file

@ -56,6 +56,7 @@ pub unsafe trait Zeroable: Default {
/// ## Differences with `core::mem::zeroed`
///
/// `const_zero` zeroes padding bits, while `core::mem::zeroed` doesn't
#[macro_export]
macro_rules! const_zero {
// This macro to produce a type-generic zero constant is taken from the
// const_zero crate (v0.1.1):
@ -77,10 +78,11 @@ macro_rules! const_zero {
}
/// A wrapper to implement the `Zeroable` trait through the `const_zero` macro.
#[macro_export]
macro_rules! impl_zeroable {
($type:ty) => {
unsafe impl Zeroable for $type {
const ZERO: Self = unsafe { const_zero!($type) };
unsafe impl $crate::zeroable::Zeroable for $type {
const ZERO: Self = unsafe { $crate::const_zero!($type) };
}
};
}