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71 lines
2.1 KiB
Rust
71 lines
2.1 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2021-2022 Andre Richter <andre.o.richter@gmail.com>
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//! Allocation.
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use super::MemoryRegion;
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use crate::{
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memory::{AddressType, Virtual},
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synchronization::IRQSafeNullLock,
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warn,
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};
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use core::num::NonZeroUsize;
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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/// A page allocator that can be lazyily initialized.
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pub struct PageAllocator<ATYPE: AddressType> {
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pool: Option<MemoryRegion<ATYPE>>,
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}
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//--------------------------------------------------------------------------------------------------
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// Global instances
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//--------------------------------------------------------------------------------------------------
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static KERNEL_MMIO_VA_ALLOCATOR: IRQSafeNullLock<PageAllocator<Virtual>> =
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IRQSafeNullLock::new(PageAllocator::new());
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Return a reference to the kernel's MMIO virtual address allocator.
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pub fn kernel_mmio_va_allocator() -> &'static IRQSafeNullLock<PageAllocator<Virtual>> {
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&KERNEL_MMIO_VA_ALLOCATOR
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}
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impl<ATYPE: AddressType> PageAllocator<ATYPE> {
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/// Create an instance.
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pub const fn new() -> Self {
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Self { pool: None }
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}
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/// Initialize the allocator.
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pub fn initialize(&mut self, pool: MemoryRegion<ATYPE>) {
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if self.pool.is_some() {
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warn!("Already initialized");
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return;
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}
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self.pool = Some(pool);
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}
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/// Allocate a number of pages.
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pub fn alloc(
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&mut self,
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num_requested_pages: NonZeroUsize,
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) -> Result<MemoryRegion<ATYPE>, &'static str> {
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if self.pool.is_none() {
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return Err("Allocator not initialized");
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}
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self.pool
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.as_mut()
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.unwrap()
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.take_first_n_pages(num_requested_pages)
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}
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}
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