49 lines
1.9 KiB
Rust
49 lines
1.9 KiB
Rust
//! Global Allocator for UEFI.
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//! Uses [r-efi-alloc](https://crates.io/crates/r-efi-alloc)
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use r_efi::protocols::loaded_image;
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use crate::alloc::{GlobalAlloc, Layout, System};
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use crate::sync::OnceLock;
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use crate::sys::pal::helpers;
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#[stable(feature = "alloc_system_type", since = "1.28.0")]
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unsafe impl GlobalAlloc for System {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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static EFI_MEMORY_TYPE: OnceLock<u32> = OnceLock::new();
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// Return null pointer if boot services are not available
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if crate::os::uefi::env::boot_services().is_none() {
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return crate::ptr::null_mut();
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}
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// If boot services is valid then SystemTable is not null.
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let system_table = crate::os::uefi::env::system_table().as_ptr().cast();
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// Each loaded image has an image handle that supports `EFI_LOADED_IMAGE_PROTOCOL`. Thus, this
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// will never fail.
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let mem_type = EFI_MEMORY_TYPE.get_or_init(|| {
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let protocol = helpers::image_handle_protocol::<loaded_image::Protocol>(
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loaded_image::PROTOCOL_GUID,
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)
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.unwrap();
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// Gives allocations the memory type that the data sections were loaded as.
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unsafe { (*protocol.as_ptr()).image_data_type }
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});
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// The caller must ensure non-0 layout
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unsafe { r_efi_alloc::raw::alloc(system_table, layout, *mem_type) }
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}
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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// Do nothing if boot services are not available
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if crate::os::uefi::env::boot_services().is_none() {
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return;
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}
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// If boot services is valid then SystemTable is not null.
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let system_table = crate::os::uefi::env::system_table().as_ptr().cast();
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// The caller must ensure non-0 layout
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unsafe { r_efi_alloc::raw::dealloc(system_table, ptr, layout) }
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}
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}
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