scheduling: Trigger kernel panic if no process queue is empty

2 files changed, 6 insertions, 2 deletions

diff --git a/src/interrupts.zig b/src/interrupts.zig
index 2a6bf34..4d12f99 100644
--- a/src/interrupts.zig
+++ b/src/interrupts.zig
@@ -266,12 +266,12 @@ export fn supervisorTrapVector() align(4) callconv(.Naked) noreturn {
     );
 }
 
-fn schedule() noreturn {
+fn schedule() !noreturn {
     if (process.next()) |next| {
         process.switchTo(next);
     }
 
-    while (true) asm volatile ("wfi");
+    return process.Error.EmptySchedule;
 }
 
 pub fn init() void {
diff --git a/src/process.zig b/src/process.zig
index a6217c6..045d667 100644
--- a/src/process.zig
+++ b/src/process.zig
@@ -13,6 +13,10 @@ const num_stack_pages = 2;
 var next_pid: u16 = 1;
 var list = std.mem.zeroInit(std.DoublyLinkedList(Info), .{});
 
+pub const Error = error{
+    EmptySchedule,
+};
+
 pub const State = enum(u8) {
     waiting,
     active,