| //! Global Allocator for UEFI. |
| //! Uses [r-efi-alloc](https://crates.io/crates/r-efi-alloc) |
| |
| use crate::alloc::{GlobalAlloc, Layout, System}; |
| |
| const MEMORY_TYPE: u32 = r_efi::efi::LOADER_DATA; |
| |
| #[stable(feature = "alloc_system_type", since = "1.28.0")] |
| unsafe impl GlobalAlloc for System { |
| unsafe fn alloc(&self, layout: Layout) -> *mut u8 { |
| // Return null pointer if boot services are not available |
| if crate::os::uefi::env::boot_services().is_none() { |
| return crate::ptr::null_mut(); |
| } |
| |
| // If boot services is valid then SystemTable is not null. |
| let system_table = crate::os::uefi::env::system_table().as_ptr().cast(); |
| // The caller must ensure non-0 layout |
| unsafe { r_efi_alloc::raw::alloc(system_table, layout, MEMORY_TYPE) } |
| } |
| |
| unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) { |
| // Do nothing if boot services are not available |
| if crate::os::uefi::env::boot_services().is_none() { |
| return; |
| } |
| |
| // If boot services is valid then SystemTable is not null. |
| let system_table = crate::os::uefi::env::system_table().as_ptr().cast(); |
| // The caller must ensure non-0 layout |
| unsafe { r_efi_alloc::raw::dealloc(system_table, ptr, layout) } |
| } |
| } |