xnu-6153.41.3.tar.gz

[apple/xnu.git] / bsd / dev / i386 / sysctl.c

diff --git a/bsd/dev/i386/sysctl.c b/bsd/dev/i386/sysctl.c
index 39dd111107ac1a9273bd900a1d957b0140799c6d..567c5817e636c6da6808805218f22f892fbfd1c3 100644 (file)
--- a/bsd/dev/i386/sysctl.c
+++ b/bsd/dev/i386/sysctl.c
@@ -1027,9 +1027,34 @@ SYSCTL_INT(_machdep, OID_AUTO, fpsimd_fault_popc,
     CTLFLAG_KERN | CTLFLAG_RW | CTLFLAG_LOCKED,
     &fpsimd_fault_popc, 0, "");
 
-extern int allow_64bit_proc_LDT_ops;
-SYSCTL_INT(_machdep, OID_AUTO, ldt64,
+volatile int stop_spinning;
+static int
+spin_in_the_kernel(__unused struct sysctl_oid *oidp, __unused void *arg1, __unused int arg2, struct sysctl_req *req)
+{
+       int new = 0, old = 0, changed = 0, error;
+
+       error = sysctl_io_number(req, old, sizeof(int), &new, &changed);
+       if (error == 0 && changed) {
+               stop_spinning = FALSE;
+               while (stop_spinning == FALSE) {
+                       __builtin_ia32_pause();
+               }
+       } else if (error == 0) {
+               stop_spinning = TRUE;
+       }
+
+       return error;
+}
+
+SYSCTL_PROC(_machdep_misc, OID_AUTO, spin_forever,
+    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED | CTLFLAG_MASKED,
+    0, 0,
+    spin_in_the_kernel, "I", "Spin forever");
+
+
+extern int traptrace_enabled;
+SYSCTL_INT(_machdep_misc, OID_AUTO, traptrace_enabled,
     CTLFLAG_KERN | CTLFLAG_RW | CTLFLAG_LOCKED,
-    &allow_64bit_proc_LDT_ops, 0, "");
+    &traptrace_enabled, 0, "Enabled/disable trap trace");
 
 #endif /* DEVELOPMENT || DEBUG */