48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
use crate::alloc;
|
|
|
|
use alloc::{Alloc, AllocErr};
|
|
use std::alloc::Layout;
|
|
|
|
#[derive(Debug)]
|
|
pub struct BPFAllocator {
|
|
heap: Vec<u8>,
|
|
start: u64,
|
|
len: u64,
|
|
pos: u64,
|
|
}
|
|
|
|
impl BPFAllocator {
|
|
pub fn new(heap: Vec<u8>, virtual_address: u64) -> Self {
|
|
let len = heap.len() as u64;
|
|
Self {
|
|
heap,
|
|
start: virtual_address,
|
|
len,
|
|
pos: 0,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Alloc for BPFAllocator {
|
|
fn alloc(&mut self, layout: Layout) -> Result<u64, AllocErr> {
|
|
let bytes_to_align = (self.pos as *const u8).align_offset(layout.align()) as u64;
|
|
if self
|
|
.pos
|
|
.saturating_add(layout.size() as u64)
|
|
.saturating_add(bytes_to_align)
|
|
<= self.len
|
|
{
|
|
self.pos += bytes_to_align;
|
|
let addr = self.start + self.pos;
|
|
self.pos += layout.size() as u64;
|
|
Ok(addr)
|
|
} else {
|
|
Err(AllocErr)
|
|
}
|
|
}
|
|
|
|
fn dealloc(&mut self, _addr: u64, _layout: Layout) {
|
|
// It's a bump allocator, free not supported
|
|
}
|
|
}
|