diff --git a/src/kern/dpc.zig b/src/kern/dpc.zig
index 61c53ca..9130175 100644
--- a/src/kern/dpc.zig
+++ b/src/kern/dpc.zig
@@ -11,14 +11,14 @@ pub const Dpc = struct {
     /// Entry into per-CPU DPC queue
     link: rtl.List.Entry,
     /// Routine to call
-    func: *const fn (?*anyopaque) void,
+    func: *const fn (*Dpc, ?*anyopaque) void,
     /// Argument passed to the routine
     arg: ?*anyopaque,
     /// Whether or not the DPC is currently inserted
     inserted: std.atomic.Value(bool),
 
     /// Initialize a DPC for `func`.
-    pub fn init(func: *const fn (?*anyopaque) void) Dpc {
+    pub fn init(func: *const fn (*Dpc, ?*anyopaque) void) Dpc {
         return .{
             .link = undefined,
             .func = func,
@@ -105,7 +105,7 @@ fn dispatch_queue(cpu: u32) void {
         dpc_cpu.lock.release(ipl);
         std.debug.assert(ke.ipl.current() == .Dispatch);
 
-        dpc.func(arg);
+        dpc.func(dpc, arg);
     }
 
     if (sched_cpu.start_timer) {
diff --git a/src/kern/sched.zig b/src/kern/sched.zig
index d7f02f7..b9bb8ec 100644
--- a/src/kern/sched.zig
+++ b/src/kern/sched.zig
@@ -189,7 +189,7 @@ pub fn handle_preemption(cpu: *PerCpu) void {
 }
 
 /// Called every time slice in DPC context.
-pub fn clock(_: ?*anyopaque) void {
+pub fn clock(_: *ke.Dpc, _: ?*anyopaque) void {
     const cpu = percpu.local();
     std.debug.assert(ki.ipl.current() == .Dispatch);
 
@@ -1019,7 +1019,7 @@ pub fn idle(_: ?*anyopaque) noreturn {
 
 /// Called every second to balance work between CPUs on CPU0.
 /// Takes a thread from the most loaded CPU and puts it on the least loaded one.
-fn balance(_: ?*anyopaque) void {
+fn balance(_: *ke.Dpc, _: ?*anyopaque) void {
     var high_mask = ke.CpuMask.init(false);
     var low_mask: ke.CpuMask = undefined;
 
diff --git a/src/kern/timer.zig b/src/kern/timer.zig
index bc561d7..7955892 100644
--- a/src/kern/timer.zig
+++ b/src/kern/timer.zig
@@ -138,7 +138,7 @@ pub fn clock() void {
 }
 
 // Called in a DPC when a timer has expired.
-fn handle_expiry(_: ?*anyopaque) void {
+fn handle_expiry(_: *ke.Dpc, _: ?*anyopaque) void {
     std.debug.assert(ki.ipl.current() == .Dispatch);
     const cpu = percpu.local();