Exclude kmain from profile.

src/arch/x86_64/interrupt/exception.rs

@@ -24,7 +24,7 @@ interrupt_stack!(divide_by_zero, |stack| {
 });
 
 interrupt_stack!(debug, @paranoid, |stack| {
-    /*let mut handled = false;
+    let mut handled = false;
 
     // Disable singlestep before there is a breakpoint, since the breakpoint
     // handler might end up setting it again but unless it does we want the
@@ -39,13 +39,11 @@ interrupt_stack!(debug, @paranoid, |stack| {
         stack.set_singlestep(had_singlestep);
     }
 
-    if !handled {*/
+    if !handled {
         println!("Debug trap");
         stack.dump();
-        loop {}
-        /*
         ksignal(SIGTRAP);
-    }*/
+    }
 });
 
 interrupt_stack!(non_maskable, @paranoid, |stack| {
@@ -55,6 +53,9 @@ interrupt_stack!(non_maskable, @paranoid, |stack| {
     if stack.iret.cs & 0b00 == 0b11 {
         profiling.nmi_ucount.store(profiling.nmi_ucount.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
         return;
+    } else if stack.iret.rflags & (1 << 9) != 0 {
+        // Interrupts were enabled, i.e. we were in kmain, so ignore.
+        return;
     } else {
         profiling.nmi_kcount.store(profiling.nmi_kcount.load(Ordering::Relaxed) + 1, Ordering::Relaxed);
     };
@@ -86,7 +87,6 @@ interrupt_stack!(non_maskable, @paranoid, |stack| {
 });
 
 interrupt_stack!(breakpoint, |stack| {
-    /*
     // The processor lets RIP point to the instruction *after* int3, so
     // unhandled breakpoint interrupt don't go in an infinite loop. But we
     // throw SIGTRAP anyway, so that's not a problem.
@@ -100,13 +100,11 @@ interrupt_stack!(breakpoint, |stack| {
     // int3 instruction. After all, it's the sanest thing to do.
     stack.iret.rip -= 1;
 
-    if ptrace::breakpoint_callback(PTRACE_STOP_BREAKPOINT, None).is_none() {*/
+    if ptrace::breakpoint_callback(PTRACE_STOP_BREAKPOINT, None).is_none() {
         println!("Breakpoint trap");
         stack.dump();
-        loop {}
-        /*
         ksignal(SIGTRAP);
-    }*/
+    }
 });
 
 interrupt_stack!(overflow, |stack| {

src/main.rs

@@ -230,7 +230,7 @@ fn kmain_ap(cpu_id: LogicalCpuId) -> ! {
             let apic = &mut crate::device::local_apic::LOCAL_APIC;
             apic.set_lvt_timer((0b01 << 17) | 32);
             apic.set_div_conf(0b1011);
-            apic.set_init_count(0xffff);
+            apic.set_init_count(0xffff_f);
 
             while ACK.load(Ordering::Relaxed) < 4 {
                 core::hint::spin_loop();