some cleanup before the rest of the tutorial

qemu.sh

@@ -9,7 +9,7 @@ start() {
 		-gdb tcp::${QEMU_GDB_PORT} \
 		-monitor unix:${QEMU_SOCKET},server,nowait \
 		-enable-kvm \
-		-m 1337M \
+		-m 1341M \
 		-curses \
 		-kernel ${KERNEL}
 		# -drive file=disk.img,if=virtio\

src/arch/x86/paging.zig

@@ -68,7 +68,7 @@ pub fn initialize() void {
     setupPaging(@ptrToInt(&pageDirectory[0])); //asm routine
 }
 
-pub fn introspect() void {
+pub fn format() void {
     var i: usize = 1;
     i = 0;
     while (i < 1024) : (i += 1) {

src/arch/x86/pmem.zig

@@ -88,6 +88,6 @@ pub fn initialize(info: *const kernel.multiboot.MultibootInfo) void {
     kernel.println("available memory: {d} MiB ", available() / 1024 / 1024);
 }
 
-pub fn introspect() void {
+pub fn format() void {
     kernel.println("physframes left: {d} ({d} MiB)", stack_index, available_MiB());
 }

src/console.zig

@@ -10,9 +10,11 @@ var command_len: usize = 0;
 
 fn execute(input: []u8) void {
     const eql = std.mem.eql;
-    if (eql(u8, input, "x86paging")) return x86.paging.introspect();
-    if (eql(u8, input, "x86memory")) return x86.pmem.introspect();
-    if (eql(u8, input, "tasks")) return task.introspect();
+    if (eql(u8, input, "clear")) return vga.clear();
+    if (eql(u8, input, "x86paging")) return x86.paging.format();
+    if (eql(u8, input, "x86memory")) return x86.pmem.format();
+    if (eql(u8, input, "tasks")) return task.format();
+    if (eql(u8, input, "tasks")) return task.format_short();
     if (eql(u8, input, "lspci")) return pci.lspci();
     if (eql(u8, input, "uptime")) return time.uptime();
     println("{}: command not found", input);

src/delta_queue.zig

@@ -28,7 +28,7 @@ pub fn DeltaQueue(comptime T: type) type {
             ///
             /// Arguments:
             ///     new_node: Pointer to the new node to insert.
-            pub fn insertAfter(node: *Node, new_node: *Node) void {
+            fn insertAfter(node: *Node, new_node: *Node) void {
                 if (node.next) |after| {
                     std.debug.assert(new_node.counter <= after.counter); //sanity check
                     after.counter -= new_node.counter;
@@ -38,6 +38,7 @@ pub fn DeltaQueue(comptime T: type) type {
             }
         };
 
+        len: usize = 0,
         first: ?*Node,
 
         /// Initialize a delta queue.
@@ -56,6 +57,8 @@ pub fn DeltaQueue(comptime T: type) type {
         ///     node: Pointer to a node in the list.
         ///     new_node: Pointer to the new node to insert.
         pub fn insert(list: *Self, node: *Node) void {
+            list.len += 1;
+
             var target: ?*Node = null;
             var next: ?*Node = list.first;
             while (true) {
@@ -108,6 +111,7 @@ pub fn DeltaQueue(comptime T: type) type {
             const first = list.first orelse return null;
             if (first.counter != 0) return null;
             list.first = first.next;
+            list.len -= 1;
             return first;
         }
 

src/pci/pci.zig

@@ -42,9 +42,12 @@ pub const PciDevice = struct {
     pub fn format(self: PciDevice) void {
         print("{}:{}.{}", self.bus, self.slot, self.function);
         print(" {x},{x:2}", self.class(), self.subclass());
-        print(" 0x{x},0x{x}", self.vendor, self.device());
-        if (self.driver()) |d|
+        print(" 0x{x} 0x{x}", self.vendor, self.device());
+        if (self.driver()) |d| {
             print(" {}", d.name);
+        } else {
+            print(" (none)");
+        }
         println("");
     }
 
@@ -141,7 +144,7 @@ pub fn scan() void {
 
 pub fn lspci() void {
     var slot: u5 = 0;
-    println("b:s.f c, s      v      d     drv");
+    println("b:s.f c, s vendor device driver");
     while (slot < 31) : (slot += 1) {
         if (PciDevice.init(0, slot, 0)) |dev| {
             var function: u3 = 0;

src/task.zig

@@ -73,6 +73,7 @@ pub fn new(entrypoint: usize) !void {
     ready_tasks.prepend(node);
 }
 
+// TODO: make a sleep without malloc
 pub fn usleep(usec: u64) !void {
     const node = try vmem.create(SleepNode);
     lock_scheduler();
@@ -163,7 +164,11 @@ pub fn unlock_scheduler() void {
     }
 }
 
-pub fn introspect() void {
+pub fn format_short() void {
+    print("{}R {}B {}S", ready_tasks.len, blocked_tasks.len, sleeping_tasks.len);
+}
+
+pub fn format() void {
     update_time_used();
 
     println("{}", current_task.data);

src/time.zig

@@ -8,6 +8,6 @@ pub fn increment(value: u32) void {
 pub fn uptime() void {
     var offset_ms: u64 = offset_us / 1000;
     const offset_s: u64 = offset_ms / 1000;
-    offset_ms = @mod(offset_ms, 1000);
-    println("{}.{:.3}", offset_s, offset_ms);
+    offset_ms = @mod(offset_ms / 100, 10);
+    print("{}.{:.3}", offset_s, offset_ms);
 }

src/vga.zig

@@ -65,20 +65,21 @@ pub fn clear() void {
 pub fn topbar() void {
     const bg = vga.background;
     while (true) {
-        if (time.offset_us / 1000000 == 4) task.usleep(2 * 1000 * 1000) catch unreachable;
         const cursor = vga.cursor;
-        vga.cursor = 0;
         vga.background = Color.Red;
+        vga.cursor = 0;
         vga.cursor_enabled = false;
 
         time.uptime();
+        print(" | ");
+        task.format_short();
+        println("");
 
         vga.cursor_enabled = true;
         vga.cursor = cursor;
         vga.background = bg;
 
-        task.lock_scheduler();
-        task.schedule();
+        task.usleep(60 * 1000) catch unreachable; // 60ms
     }
 }