diff --git a/src/lib.rs b/src/lib.rs
index 2f4ea89..15ac101 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -114,6 +114,14 @@ pub fn open(path: &str, flags: usize) -> Result<usize> {
     unsafe { syscall3(SYS_OPEN, path.as_ptr() as usize, path.len(), flags) }
 }
 
+pub unsafe fn physalloc(size: usize) -> Result<usize> {
+    syscall1(SYS_PHYSALLOC, size)
+}
+
+pub unsafe fn physfree(physical_address: usize, size: usize) -> Result<usize> {
+    syscall2(SYS_PHYSFREE, physical_address, size)
+}
+
 pub unsafe fn physmap(physical_address: usize, size: usize, flags: usize) -> Result<usize> {
     syscall3(SYS_PHYSMAP, physical_address, size, flags)
 }
@@ -138,6 +146,10 @@ pub fn unlink(path: &str) -> Result<usize> {
     unsafe { syscall2(SYS_UNLINK, path.as_ptr() as usize, path.len()) }
 }
 
+pub unsafe fn virttophys(virtual_address: usize) -> Result<usize> {
+    syscall1(SYS_VIRTTOPHYS, virtual_address)
+}
+
 pub fn waitpid(pid: usize, status: &mut usize, options: usize) -> Result<usize> {
     unsafe { syscall3(SYS_WAITPID, pid, status as *mut usize as usize, options) }
 }
diff --git a/src/number.rs b/src/number.rs
index c0f341c..b0d41c0 100644
--- a/src/number.rs
+++ b/src/number.rs
@@ -20,8 +20,11 @@ pub const SYS_LSEEK: usize = 19;
 pub const SYS_MKDIR: usize = 39;
 pub const SYS_NANOSLEEP: usize = 162;
 pub const SYS_OPEN: usize = 5;
-pub const SYS_PHYSMAP: usize = 945;
-pub const SYS_PHYSUNMAP: usize = 946;
+pub const SYS_PHYSALLOC: usize = 945;
+pub const SYS_PHYSFREE: usize = 946;
+pub const SYS_PHYSMAP: usize = 947;
+pub const SYS_PHYSUNMAP: usize = 948;
+pub const SYS_VIRTTOPHYS: usize = 949;
 pub const SYS_PIPE2: usize = 331;
 pub const SYS_READ: usize = 3;
 pub const SYS_RMDIR: usize = 84;