From dbefd9336cc808e76f8e9d8d238f5a348d14604a Mon Sep 17 00:00:00 2001
From: Tianhao Wang <wth@riseup.net>
Date: Sun, 25 Feb 2024 04:55:09 +0100
Subject: add mm and ds modules (yet empty)

---
 src/mm/heap_allocator.rs |  2 ++
 src/mm/mod.rs            |  1 +
 src/mm/pma.rs            | 28 +++++++++++++++++++++++++---
 3 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 src/mm/heap_allocator.rs

(limited to 'src/mm')

diff --git a/src/mm/heap_allocator.rs b/src/mm/heap_allocator.rs
new file mode 100644
index 0000000..5a7463d
--- /dev/null
+++ b/src/mm/heap_allocator.rs
@@ -0,0 +1,2 @@
+#![feature(global_allocator, allocator_api, heap_api)]
+struct HeapAllocator;
diff --git a/src/mm/mod.rs b/src/mm/mod.rs
index 1298d0d..b030dfb 100644
--- a/src/mm/mod.rs
+++ b/src/mm/mod.rs
@@ -1 +1,2 @@
+pub mod heap_allocator;
 pub mod pma;
diff --git a/src/mm/pma.rs b/src/mm/pma.rs
index f9a40ee..aa5e193 100644
--- a/src/mm/pma.rs
+++ b/src/mm/pma.rs
@@ -1,9 +1,31 @@
-use core::ffi::c_void;
 use crate::defs::Mem;
+use core::ffi::c_void;
+use core::{ptr, slice};
 // this is POC code, it will be ugly
+
 extern "C" {
-    static KERNEL_END: *const c_void;
+	pub fn ___KERNEL_END__();
+}
+/// Bitmap for physical frames. to get around the chicken-egg problem, we provide a provisional
+/// bitmap of fixed length in the startup code.
+pub struct PFMap {
+	bm: &'static mut [u8],
+	skip: usize, // pfn to skip (because they are already used by the initial kernel image)
+	end: usize,  // pfn limit
 }
 
-// pub struct PageAlloctor;
+// TODO PMA initialization : needs to singleton
+
+impl PFMap {}
 
+pub struct Frame {
+	pfn: usize,
+}
+
+impl Frame {
+	pub fn addr(&self) -> usize {
+		self.pfn << Mem::PAGE_SHIFT
+	}
+}
+
+// pub struct PageAlloctor;
-- 
cgit v1.2.3-70-g09d2