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7630ca2a70
Not a major change but, as a small but significant step in creating qdev bindings, show how pl011_create can be written without "unsafe" calls (apart from converting pointers to references). This also provides a starting point for creating Error** bindings. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
93 lines
3 KiB
Rust
93 lines
3 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_mut};
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pub use bindings::{SysBusDevice, SysBusDeviceClass};
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use crate::{
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bindings,
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cell::bql_locked,
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irq::{IRQState, InterruptSource},
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memory::MemoryRegion,
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prelude::*,
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qdev::{DeviceClass, DeviceState},
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qom::{ClassInitImpl, Owned},
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};
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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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qom_isa!(SysBusDevice: DeviceState, Object);
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// TODO: add SysBusDeviceImpl
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impl<T> ClassInitImpl<SysBusDeviceClass> for T
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where
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T: ClassInitImpl<DeviceClass>,
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{
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fn class_init(sdc: &mut SysBusDeviceClass) {
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<T as ClassInitImpl<DeviceClass>>::class_init(&mut sdc.parent_class);
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}
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}
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/// Trait for methods of [`SysBusDevice`] and its subclasses.
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pub trait SysBusDeviceMethods: ObjectDeref
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where
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Self::Target: IsA<SysBusDevice>,
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{
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/// Expose a memory region to the board so that it can give it an address
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/// in guest memory. Note that the ordering of calls to `init_mmio` is
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/// important, since whoever creates the sysbus device will refer to the
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/// region with a number that corresponds to the order of calls to
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/// `init_mmio`.
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fn init_mmio(&self, iomem: &MemoryRegion) {
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assert!(bql_locked());
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unsafe {
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bindings::sysbus_init_mmio(self.as_mut_ptr(), iomem.as_mut_ptr());
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}
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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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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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// TODO: do we want a type like GuestAddress here?
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fn mmio_map(&self, id: u32, addr: u64) {
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assert!(bql_locked());
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let id: i32 = id.try_into().unwrap();
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unsafe {
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bindings::sysbus_mmio_map(self.as_mut_ptr(), id, addr);
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}
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}
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// Owned<> is used here because sysbus_connect_irq (via
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// object_property_set_link) adds a reference to the IRQState,
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// which can prolong its life
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fn connect_irq(&self, id: u32, irq: &Owned<IRQState>) {
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assert!(bql_locked());
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let id: i32 = id.try_into().unwrap();
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unsafe {
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bindings::sysbus_connect_irq(self.as_mut_ptr(), id, irq.as_mut_ptr());
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}
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}
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fn sysbus_realize(&self) {
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// TODO: return an Error
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assert!(bql_locked());
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unsafe {
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bindings::sysbus_realize(self.as_mut_ptr(), addr_of_mut!(bindings::error_fatal));
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}
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}
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}
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impl<R: ObjectDeref> SysBusDeviceMethods for R where R::Target: IsA<SysBusDevice> {}
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