mm: add stack based PMA

use 8MiB reserved array to manage up to 4GiB of physical memory
(4K Pages only)

Signed-off-by: Tianhao Wang <shrik3@mailbox.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/machine/multiboot.rs b/src/machine/multiboot.rs
index a8fa4f0..303ed17 100644
--- a/src/machine/multiboot.rs
+++ b/src/machine/multiboot.rs
@@ -1,3 +1,4 @@
+use crate::defs::Range;
 use crate::io::*;
 use core::fmt;
 use core::mem::size_of;
@@ -57,6 +58,15 @@ impl MultibootMmap {
 	pub const MTYPE_RAM_NVS: u32 = 4;
 	/// defective RAM
 	pub const MTYPE_RAM_DEFECT: u32 = 5;
+	pub fn get_range(&self) -> Range {
+		return Range {
+			addr: self.addr,
+			len: self.len,
+		};
+	}
+	pub fn get_end(&self) -> u64 {
+		return self.addr + self.len;
+	}
 }
 
 #[repr(C)]