src/hulk/hulk.d

@@ -26,7 +26,6 @@ import hulk.usb;
 import hulk.pit;
 import hulk.time;
 import hulk.test;
-import hulk.thread;
 
 extern extern(C) __gshared ubyte _hulk_bss_size;
 
@@ -34,7 +33,7 @@ extern extern(C) __gshared ubyte _hulk_bss_size;
 private __gshared HulkHeader hulk_header = {
     &_hulk_bss_size, /* hulk_bss_size */
     &hulk_start, /* entry */
-    Thread.STACK_SIZE, /* stack_size */
+    16u * 1024u, /* stack_size */
     Hurl.HULK_BASE, /* virt_base */
     Hurl.HULK_STACK_TOP, /* virt_stack_top */
     Hurl.HULK_FRAMEBUFFER, /* virt_fb_buffer */
@@ -89,14 +88,18 @@ void hulk_start()
     Pit.initialize();
     Pci.initialize();
     Usb.initialize();
-    Thread.initialize();
 
     resume_interrupts();
 
-    Test.run();
+    /* Check that PIT millisecond interrupt is firing. */
+    size_t uptime = Time.uptime();
+    while (Time.uptime() <= uptime)
+    {
+    }
     Klog.writefln("\a5HULK Initialization Complete!");
 
     /* Run kernel tests. */
+    Test.run();
 
     /* Idle loop. */
     Time.msleep(1);

src/hulk/idt.d

@@ -11,12 +11,11 @@ import hulk.klog;
 import hulk.apic;
 import hulk.cpu;
 import hulk.kfont;
-import hulk.thread;
 
 struct Idt
 {
     /** Interrupt stack frame indices. */
-    public static enum
+    private static enum
     {
         ISF_RBP,
         ISF_R15,
@@ -148,7 +147,7 @@ struct Idt
                 mov $$", isr, ", %rdi
                 movabs $$isr, %rax
                 callq *%rax
-                mov %rax, %rsp
+                mov %rbp, %rsp
                 popq %rbp
                 popq %r15
                 popq %r14
@@ -185,15 +184,8 @@ struct Idt
     }
 }
 
-/**
- * Interrupt service routine.
- *
- * This function returns the stack pointer of the thread to execute when
- * returning from this function.
- */
-public extern(C) ulong * isr(ulong vector, ulong * stack_frame)
+public extern(C) void isr(ulong vector, ulong * stack_frame)
 {
-    Thread.current_thread.stack_pointer = stack_frame;
     if ((vector >= Idt.INT_APIC_BASE) && (vector < (Idt.INT_APIC_BASE + Idt.INT_APIC_COUNT)))
     {
         Apic.isr(vector);
@@ -225,5 +217,4 @@ public extern(C) ulong * isr(ulong vector, ulong * stack_frame)
             }
         }
     }
-    return Thread.current_thread.stack_pointer;
 }

src/hulk/test.d

@@ -5,7 +5,6 @@ module hulk.test;
 
 import hulk.klog;
 import hulk.list;
-import hulk.time;
 
 struct Test
 {
@@ -15,21 +14,10 @@ struct Test
     public static void run()
     {
         Klog.writefln("\a3Running kernel tests");
-        test_pit();
         test_list();
         Klog.writefln("\a3Kernel tests complete");
     }
 
-    private static void test_pit()
-    {
-        Klog.writefln("Testing PIT...");
-        /* Check that PIT millisecond interrupt is firing. */
-        size_t uptime = Time.uptime();
-        while (Time.uptime() <= uptime)
-        {
-        }
-    }
-
     private static void test_list()
     {
         Klog.writefln("Testing list...");

src/hulk/thread.d

@@ -1,102 +0,0 @@
-/**
- * Kernel thread functionality.
- */
-module hulk.thread;
-
-import hulk.hurl.a1;
-import hulk.idt;
-import hulk.gdt;
-import hulk.memory;
-import hulk.list;
-import hulk.cpu;
-import hulk.hurl;
-
-struct Thread
-{
-    /* TODO: currently kernel thread stack size is fixed. */
-    enum STACK_SIZE = 16 * 1024;
-
-    /** List of all kernel threads. */
-    private static __gshared List!Thread threads;
-
-    /** Currently executing kernel thread. */
-    static __gshared Thread * current_thread;
-
-    /** Current kernel thread stack pointer. */
-    ulong * stack_pointer;
-    static assert(stack_pointer.offsetof == 0);
-
-    /** Base address of kernel thread stack. */
-    void * stack_addr;
-
-    /** Interrupt stack template. */
-    static immutable __gshared ulong[Idt.ISF_COUNT] interrupt_stack_template = [
-        0x16161616_16161616u, /* RBP */
-        0x15151515_15151515u, /* R15 */
-        0x14141414_14141414u, /* R14 */
-        0x13131313_13131313u, /* R13 */
-        0x12121212_12121212u, /* R12 */
-        0x11111111_11111111u, /* R11 */
-        0x10101010_10101010u, /* R10 */
-        0x09090909_09090909u, /* R9 */
-        0x08080808_08080808u, /* R8 */
-        0x06060606_06060606u, /* RDI */
-        0x05050505_05050505u, /* RSI */
-        0x04040404_04040404u, /* RDX */
-        0x03030303_03030303u, /* RCX */
-        0x02020202_02020202u, /* RBX */
-        0x01010101_01010101u, /* RAX */
-        0u, /* Error Code */
-        0u, /* RIP */
-        Gdt.SELECTOR_KERNEL_CODE, /* CS */
-        0u, /* RFLAGS */
-        0u, /* RSP */
-        Gdt.SELECTOR_KERNEL_DATA, /* SS */
-    ];
-
-    /**
-     * Initialize a kernel thread.
-     */
-    public void initialize(void function() fn)
-    {
-        stack_addr = A1.allocate(STACK_SIZE);
-        ulong * stack_top = cast(ulong *)(stack_addr + STACK_SIZE);
-        stack_pointer = stack_top - Idt.ISF_COUNT;
-        memcpy64(stack_pointer, &interrupt_stack_template[0], Idt.ISF_COUNT);
-        stack_pointer[Idt.ISF_RIP] = cast(ulong)fn;
-        stack_pointer[Idt.ISF_RFLAGS] = read_rflags();
-        stack_pointer[Idt.ISF_RSP] = cast(ulong)stack_top;
-    }
-
-    /**
-     * Initialize main kernel thread.
-     */
-    public void initialize_main_thread()
-    {
-        stack_addr = cast(void *)(Hurl.HULK_STACK_TOP - STACK_SIZE);
-    }
-
-    /**
-     * Initialize kernel threading.
-     */
-    public static void initialize()
-    {
-        Thread * thread = A1.allocate!Thread();
-        thread.initialize_main_thread();
-        current_thread = thread;
-    }
-
-    /**
-     * Create and start a kernel thread.
-     *
-     * TODO: fn must not return.
-     * TODO: threads are always runnable.
-     * TODO: threads cannot be destroyed.
-     */
-    public static Thread * start(void function() fn)
-    {
-        Thread * thread = A1.allocate!Thread();
-        thread.initialize(fn);
-        return thread;
-    }
-}