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use super::{elf_cache::try_remove_elf, PhysAddr, PhysPageNum};
use crate::config::{MEMORY_END, PAGE_SIZE};
use alloc::{sync::Arc, vec::Vec};
use core::fmt::{self, Debug, Formatter};
use lazy_static::*;
use spin::RwLock;
pub struct FrameTracker {
pub ppn: PhysPageNum,
}
impl FrameTracker {
pub fn new(ppn: PhysPageNum) -> Self {
let bytes_array = ppn.get_bytes_array();
for i in bytes_array {
*i = 0;
}
Self { ppn }
}
}
impl Debug for FrameTracker {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_fmt(format_args!("FrameTracker:PPN={:#x}", self.ppn.0))
}
}
impl Drop for FrameTracker {
fn drop(&mut self) {
frame_dealloc(self.ppn);
}
}
trait FrameAllocator {
fn new() -> Self;
fn alloc(&mut self) -> Option<PhysPageNum>;
fn dealloc(&mut self, ppn: PhysPageNum);
}
pub struct StackFrameAllocator {
current: usize,
end: usize,
recycled: Vec<usize>,
}
impl StackFrameAllocator {
pub fn init(&mut self, l: PhysPageNum, r: PhysPageNum) {
self.current = l.0;
self.end = r.0;
println!("last {} Physical Frames.", self.end - self.current);
}
pub fn unallocated_frames(&self) -> usize {
self.recycled.len() + self.end - self.current
}
pub fn free_space_size(&self) -> usize {
self.unallocated_frames() * PAGE_SIZE
}
}
impl FrameAllocator for StackFrameAllocator {
fn new() -> Self {
Self {
current: 0,
end: 0,
recycled: Vec::new(),
}
}
fn alloc(&mut self) -> Option<PhysPageNum> {
if let Some(ppn) = self.recycled.pop() {
let __ppn: PhysPageNum = ppn.into();
log::trace!("[frame_alloc] {:?}", __ppn);
Some(ppn.into())
} else if self.current == self.end {
None
} else {
self.current += 1;
let __ppn: PhysPageNum = (self.current - 1).into();
log::trace!("[frame_alloc] {:?}", __ppn);
Some((self.current - 1).into())
}
}
fn dealloc(&mut self, ppn: PhysPageNum) {
let ppn = ppn.0;
if option_env!("MODE") == Some("debug") && ppn >= self.current
|| self.recycled.iter().find(|&v| *v == ppn).is_some()
{
panic!("Frame ppn={:#x} has not been allocated!", ppn);
}
self.recycled.push(ppn);
}
}
type FrameAllocatorImpl = StackFrameAllocator;
lazy_static! {
pub static ref FRAME_ALLOCATOR: RwLock<FrameAllocatorImpl> =
RwLock::new(FrameAllocatorImpl::new());
}
pub fn init_frame_allocator() {
extern "C" {
fn ekernel();
}
FRAME_ALLOCATOR.write().init(
PhysAddr::from(ekernel as usize).ceil(),
PhysAddr::from(MEMORY_END).floor(),
);
}
pub fn frame_alloc() -> Option<Arc<FrameTracker>> {
let ret = FRAME_ALLOCATOR
.write()
.alloc()
.map(|ppn| Arc::new(FrameTracker::new(ppn)));
if ret.is_some() {
ret
} else {
log::info!("Hit GC");
try_remove_elf(super::elf_cache::ELF_CACHE.read(), None);
FRAME_ALLOCATOR
.write()
.alloc()
.map(|ppn| Arc::new(FrameTracker::new(ppn)))
}
}
pub fn frame_dealloc(ppn: PhysPageNum) {
FRAME_ALLOCATOR.write().dealloc(ppn);
}
pub fn unallocated_frames() -> usize {
FRAME_ALLOCATOR.write().unallocated_frames()
}
#[allow(unused)]
pub fn frame_allocator_test() {
let mut v: Vec<Arc<FrameTracker>> = Vec::new();
for i in 0..5 {
let frame = frame_alloc().unwrap();
println!("{:?}", frame);
v.push(frame);
}
v.clear();
for i in 0..5 {
let frame = frame_alloc().unwrap();
println!("{:?}", frame);
v.push(frame);
}
drop(v);
println!("frame_allocator_test passed!");
}
pub fn free_space_size_rdlock() -> usize {
FRAME_ALLOCATOR.read().free_space_size()
}
#[macro_export]
macro_rules! show_frame_consumption {
($place:literal; $($statement:stmt); *;) => {
let __frame_consumption_before = crate::mm::unallocated_frames();
$($statement)*
let __frame_consumption_after = crate::mm::unallocated_frames();
debug!("[{}] consumed frames: {}, last frames: {}", $place, (__frame_consumption_before - __frame_consumption_after) as isize, __frame_consumption_after)
};
($place:literal, $before:ident) => {
debug!(
"[{}] consumed frames:{}, last frames:{}",
$place,
($before - crate::mm::unallocated_frames()) as isize,
crate::mm::unallocated_frames()
);
};
}