MM: add modules for memory management

1 files changed, 13 insertions, 0 deletions

diff --git a/src/defs.rs b/src/defs.rs
new file mode 100644
index 0000000..3c1ff57
--- /dev/null
+++ b/src/defs.rs
@@ -0,0 +1,13 @@
+pub struct Mem;
+impl Mem {
+	// units
+	pub const K: usize = 1024;
+	pub const M: usize = 1024 * Mem::K;
+	pub const G: usize = 1024 * Mem::M;
+	// physical memory
+	pub const PHY_TOP: usize = 128 * Mem::M; // qemu defaults to 128 MiB phy Memory
+	pub const PAGE_SIZE: usize = 0x1000;
+	pub const PAGE_SHIFT: usize = 12;
+	pub const PHY_PAGES: usize = Mem::PHY_TOP >> Mem::PAGE_SHIFT;
+	pub const PAGE_MASK: u64 = 0xfff;
+}