ps: initial process subsystem

src/proc/thread.zig

@@ -0,0 +1,28 @@
+//! Higher-level thread management.
+const r = @import("root");
+const psp = r.ps.private;
+const ke = r.ke;
+const ki = ke.private;
+const mm = r.mm;
+
+const kernel_thread_stack_size = r.kib(16);
+
+/// Higher-level wrapper over a thread.
+pub const Thread = struct {
+    /// Lower-level part of the thread.
+    kern: ke.Thread,
+};
+
+/// Create a kernel thread.
+/// - `prio`: base priority of the thread.
+/// - `entry`: entry point.
+/// - `arg`: argument passed to `entry`.
+pub fn create_kernel(prio: u8, entry: *const fn (arg: ?*anyopaque) void, arg: ?*anyopaque) !*Thread {
+    var td = try mm.zone.gpa.create(Thread);
+    const stack = try mm.heap.alloc(kernel_thread_stack_size);
+
+    td.kern.init(@intFromPtr(stack), kernel_thread_stack_size, prio, entry, arg);
+    td.kern.turnstile = try psp.turnstile_zone.create();
+
+    return td;
+}