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7bd8e3ef63
Define a separate trait for fields that also applies to classes that are defined by C code. This makes it possible to add metadata to core classes, which has multiple uses: - it makes it possible to access the parent struct's TYPE_* for types that are defined in Rust code, and to avoid repeating it in every subclass - implementors of ObjectType will be allowed to implement the IsA<> trait and therefore to perform typesafe casts from one class to another. - in the future, an ObjectType could be created with Foo::new() in a type-safe manner, without having to pass a TYPE_* constant. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
33 lines
1.2 KiB
Rust
33 lines
1.2 KiB
Rust
// Copyright 2024 Red Hat, Inc.
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// Author(s): Paolo Bonzini <pbonzini@redhat.com>
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// SPDX-License-Identifier: GPL-2.0-or-later
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use std::{ffi::CStr, ptr::addr_of};
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pub use bindings::{SysBusDevice, SysBusDeviceClass};
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use crate::{bindings, cell::bql_locked, irq::InterruptSource, prelude::*};
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unsafe impl ObjectType for SysBusDevice {
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type Class = SysBusDeviceClass;
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const TYPE_NAME: &'static CStr =
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unsafe { CStr::from_bytes_with_nul_unchecked(bindings::TYPE_SYS_BUS_DEVICE) };
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}
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impl SysBusDevice {
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/// Return `self` cast to a mutable pointer, for use in calls to C code.
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const fn as_mut_ptr(&self) -> *mut SysBusDevice {
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addr_of!(*self) as *mut _
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}
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/// Expose an interrupt source outside the device as a qdev GPIO output.
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/// Note that the ordering of calls to `init_irq` is important, since
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/// whoever creates the sysbus device will refer to the interrupts with
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/// a number that corresponds to the order of calls to `init_irq`.
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pub fn init_irq(&self, irq: &InterruptSource) {
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assert!(bql_locked());
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unsafe {
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bindings::sysbus_init_irq(self.as_mut_ptr(), irq.as_ptr());
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}
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}
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}
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