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system.rs
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system.rs
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// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Copyright © 2019 Intel Corporation
//
// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE-BSD-3-Clause file.
//
// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
use vm_memory::{GuestAddress, GuestUsize};
use crate::address::AddressAllocator;
use crate::gsi::GsiAllocator;
#[cfg(target_arch = "x86_64")]
use crate::gsi::GsiApic;
use crate::page_size::get_page_size;
/// Manages allocating system resources such as address space and interrupt numbers.
///
/// # Example - Use the `SystemAddress` builder.
///
/// ```
/// # #[cfg(target_arch = "x86_64")]
/// # use vm_allocator::{GsiApic, SystemAllocator};
/// # #[cfg(target_arch = "aarch64")]
/// # use vm_allocator::SystemAllocator;
/// # use vm_memory::{Address, GuestAddress, GuestUsize};
/// let mut allocator = SystemAllocator::new(
/// #[cfg(target_arch = "x86_64")] GuestAddress(0x1000),
/// #[cfg(target_arch = "x86_64")] 0x10000,
/// GuestAddress(0x10000000), 0x10000000,
/// #[cfg(target_arch = "x86_64")] vec![GsiApic::new(5, 19)]).unwrap();
/// #[cfg(target_arch = "x86_64")]
/// assert_eq!(allocator.allocate_irq(), Some(5));
/// #[cfg(target_arch = "aarch64")]
/// assert_eq!(allocator.allocate_irq(), Some(32));
/// #[cfg(target_arch = "x86_64")]
/// assert_eq!(allocator.allocate_irq(), Some(6));
/// #[cfg(target_arch = "aarch64")]
/// assert_eq!(allocator.allocate_irq(), Some(33));
/// assert_eq!(allocator.allocate_platform_mmio_addresses(None, 0x1000, Some(0x1000)), Some(GuestAddress(0x1fff_f000)));
///
/// ```
pub struct SystemAllocator {
#[cfg(target_arch = "x86_64")]
io_address_space: AddressAllocator,
platform_mmio_address_space: AddressAllocator,
gsi_allocator: GsiAllocator,
}
impl SystemAllocator {
/// Creates a new `SystemAllocator` for managing addresses and irq numbers.
/// Can return `None` if `base` + `size` overflows a u64
///
/// * `io_base` - (X86) The starting address of IO memory.
/// * `io_size` - (X86) The size of IO memory.
/// * `platform_mmio_base` - The starting address of platform MMIO memory.
/// * `platform_mmio_size` - The size of platform MMIO memory.
/// * `apics` - (X86) Vector of APIC's.
///
pub fn new(
#[cfg(target_arch = "x86_64")] io_base: GuestAddress,
#[cfg(target_arch = "x86_64")] io_size: GuestUsize,
platform_mmio_base: GuestAddress,
platform_mmio_size: GuestUsize,
#[cfg(target_arch = "x86_64")] apics: Vec<GsiApic>,
) -> Option<Self> {
Some(SystemAllocator {
#[cfg(target_arch = "x86_64")]
io_address_space: AddressAllocator::new(io_base, io_size)?,
platform_mmio_address_space: AddressAllocator::new(
platform_mmio_base,
platform_mmio_size,
)?,
#[cfg(target_arch = "x86_64")]
gsi_allocator: GsiAllocator::new(apics),
#[cfg(target_arch = "aarch64")]
gsi_allocator: GsiAllocator::new(),
})
}
/// Reserves the next available system irq number.
pub fn allocate_irq(&mut self) -> Option<u32> {
self.gsi_allocator.allocate_irq().ok()
}
/// Reserves the next available GSI.
pub fn allocate_gsi(&mut self) -> Option<u32> {
self.gsi_allocator.allocate_gsi().ok()
}
#[cfg(target_arch = "x86_64")]
/// Reserves a section of `size` bytes of IO address space.
pub fn allocate_io_addresses(
&mut self,
address: Option<GuestAddress>,
size: GuestUsize,
align_size: Option<GuestUsize>,
) -> Option<GuestAddress> {
self.io_address_space
.allocate(address, size, Some(align_size.unwrap_or(0x1)))
}
/// Reserves a section of `size` bytes of platform MMIO address space.
pub fn allocate_platform_mmio_addresses(
&mut self,
address: Option<GuestAddress>,
size: GuestUsize,
align_size: Option<GuestUsize>,
) -> Option<GuestAddress> {
self.platform_mmio_address_space.allocate(
address,
size,
Some(align_size.unwrap_or_else(get_page_size)),
)
}
#[cfg(target_arch = "x86_64")]
/// Free an IO address range.
/// We can only free a range if it matches exactly an already allocated range.
pub fn free_io_addresses(&mut self, address: GuestAddress, size: GuestUsize) {
self.io_address_space.free(address, size)
}
/// Free a platform MMIO address range.
/// We can only free a range if it matches exactly an already allocated range.
pub fn free_platform_mmio_addresses(&mut self, address: GuestAddress, size: GuestUsize) {
self.platform_mmio_address_space.free(address, size)
}
}