Initial import

Code is based on FreeBSD 8.2 with USB support from Sebastian Huber
and Thomas Doerfler. Initial TCP/IP stack work is from Kevel Kirspel.

1 files changed, 340 insertions, 0 deletions

diff --git a/rtems/freebsd/rtems/rtems-bsd-rwlock.c b/rtems/freebsd/rtems/rtems-bsd-rwlock.c
new file mode 100644
index 00000000..de9decd2
--- /dev/null
+++ b/rtems/freebsd/rtems/rtems-bsd-rwlock.c
@@ -0,0 +1,340 @@
+/**
+ * @file
+ *
+ * @ingroup rtems_bsd_rtems
+ *
+ * @brief TODO.
+ */
+
+/*
+ * Copyright (c) 2011 OPTI Medical.  All rights reserved.
+ *
+ *  OPTI Medical
+ *  235 Hembree Park Drive
+ *  Roswell, GA 30076
+ *  USA
+ *  <kevin.kirspel@optimedical.com>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+/* Necessary to obtain some internal functions */
+#define __RTEMS_VIOLATE_KERNEL_VISIBILITY__
+
+#include <rtems/freebsd/machine/rtems-bsd-config.h>
+
+#include <sys/types.h>
+#include <rtems/freebsd/sys/param.h>
+#include <rtems/freebsd/sys/types.h>
+#include <rtems/freebsd/sys/systm.h>
+#include <rtems/freebsd/sys/lock.h>
+#include <rtems/freebsd/sys/rwlock.h>
+#include <pthread.h>
+
+#ifndef INVARIANTS
+#define _rw_assert(rw, what, file, line)
+#endif
+
+static void assert_rw(struct lock_object *lock, int what);
+static void lock_rw(struct lock_object *lock, int how);
+#ifdef KDTRACE_HOOKS
+static int  owner_rw(struct lock_object *lock, struct thread **owner);
+#endif
+static int  unlock_rw(struct lock_object *lock);
+
+typedef uint32_t pthread_rwlock_t;
+
+struct lock_class lock_class_rw = {
+  .lc_name = "rw",
+  .lc_flags = LC_SLEEPLOCK | LC_RECURSABLE | LC_UPGRADABLE,
+  .lc_assert = assert_rw,
+#ifdef DDB
+  .lc_ddb_show = db_show_rwlock,
+#endif
+  .lc_lock = lock_rw,
+  .lc_unlock = unlock_rw,
+#ifdef KDTRACE_HOOKS
+  .lc_owner = owner_rw,
+#endif
+};
+
+RTEMS_CHAIN_DEFINE_EMPTY(rtems_bsd_rwlock_chain);
+
+void
+assert_rw(struct lock_object *lock, int what)
+{
+  rw_assert((struct rwlock *)lock, what);
+}
+
+void
+lock_rw(struct lock_object *lock, int how)
+{
+  struct rwlock *rw;
+
+  rw = (struct rwlock *)lock;
+  if (how)
+    rw_wlock(rw);
+  else
+    rw_rlock(rw);
+}
+
+int
+unlock_rw(struct lock_object *lock)
+{
+  struct rwlock *rw;
+
+  rw = (struct rwlock *)lock;
+  rw_assert(rw, RA_LOCKED | LA_NOTRECURSED);
+  if (rw->rw_lock & RW_LOCK_READ) {
+    rw_runlock(rw);
+    return (0);
+  } else {
+    rw_wunlock(rw);
+    return (1);
+  }
+}
+
+#ifdef KDTRACE_HOOKS
+int
+owner_rw(struct lock_object *lock, struct thread **owner)
+{
+  struct rwlock *rw = (struct rwlock *)lock;
+  uintptr_t x = rw->rw_lock;
+
+  *owner = rw_wowner(rw);
+  return ((x & RW_LOCK_READ) != 0 ?  (RW_READERS(x) != 0) :
+      (*owner != NULL));
+}
+#endif
+
+void
+rw_init_flags(struct rwlock *rw, const char *name, int opts)
+{
+  struct lock_class *class;
+  int i;
+  pthread_rwlock_t lock;
+  int iret;
+
+  if ((opts & RW_RECURSE) != 0) {
+    /* FIXME */
+  }
+
+  class = &lock_class_rw;
+
+  /* Check for double-init and zero object. */
+  KASSERT(!lock_initalized(&rw->lock_object), ("lock \"%s\" %p already initialized", name, rw->lock_object));
+
+  /* Look up lock class to find its index. */
+  for (i = 0; i < LOCK_CLASS_MAX; i++)
+  {
+    if (lock_classes[i] == class)
+    {
+      rw->lock_object.lo_flags = i << LO_CLASSSHIFT;
+      break;
+    }
+  }
+  KASSERT(i < LOCK_CLASS_MAX, ("unknown lock class %p", class));
+
+  iret = pthread_rwlock_init( &lock, NULL );
+  BSD_ASSERT( iret == 0 );
+
+  rw->lock_object.lo_name = name;
+  rw->lock_object.lo_flags |= LO_INITIALIZED;
+  rw->lock_object.lo_id = lock;
+
+  rtems_chain_append(&rtems_bsd_rwlock_chain, &rw->lock_object.lo_node);
+}
+
+void
+rw_destroy(struct rwlock *rw)
+{
+  int iret;
+  pthread_rwlock_destroy( rw->lock_object.lo_id );
+  BSD_ASSERT( iret == 0 );
+  rtems_chain_extract( &rw->lock_object.lo_node );
+  rw->lock_object.lo_id = 0;
+  rw->lock_object.lo_flags &= ~LO_INITIALIZED;
+}
+
+void
+rw_sysinit(void *arg)
+{
+  struct rw_args *args = arg;
+
+  rw_init(args->ra_rw, args->ra_desc);
+}
+
+void
+rw_sysinit_flags(void *arg)
+{
+  struct rw_args_flags *args = arg;
+
+  rw_init_flags(args->ra_rw, args->ra_desc, args->ra_flags);
+}
+
+int
+rw_wowned(struct rwlock *rw)
+{
+  Objects_Locations location;
+  Semaphore_Control *sema = _Semaphore_Get(rw->lock_object.lo_id, &location);
+
+  if (location == OBJECTS_LOCAL && !_Attributes_Is_counting_semaphore(sema->attribute_set)) {
+    int owned = sema->Core_control.mutex.holder_id == rtems_task_self();
+
+    _Thread_Enable_dispatch();
+
+    return owned;
+  } else {
+    _Thread_Enable_dispatch();
+
+    BSD_PANIC("unexpected semaphore location or attributes");
+  }
+}
+
+void
+_rw_wlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  pthread_rwlock_wrlock( &rw->lock_object.lo_id );
+  BSD_ASSERT( iret == 0 );
+
+  return 0;
+}
+
+int
+_rw_try_wlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  iret = pthread_rwlock_trywrlock( &rw->lock_object.lo_id );
+  if (iret == 0) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+void
+_rw_wunlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  iret = pthread_rwlock_unlock( &rw->lock_object.lo_id );
+  BSD_ASSERT( iret == 0 );
+}
+
+void
+_rw_rlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  iret = pthread_rwlock_rdlock( &rw->lock_object.lo_id );
+  BSD_ASSERT( iret == 0 );
+}
+
+int
+_rw_try_rlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  iret = pthread_rwlock_tryrdlock( &rw->lock_object.lo_id );
+  if (iret == 0) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+void
+_rw_runlock(struct rwlock *rw, const char *file, int line)
+{
+  int iret;
+
+  iret = pthread_rwlock_unlock( &rw->lock_object.lo_id );
+  BSD_ASSERT( iret == 0 );
+}
+
+#ifdef INVARIANT_SUPPORT
+#ifndef INVARIANTS
+#undef _rw_assert
+#endif
+
+/*
+ * In the non-WITNESS case, rw_assert() can only detect that at least
+ * *some* thread owns an rlock, but it cannot guarantee that *this*
+ * thread owns an rlock.
+ */
+void
+_rw_assert(struct rwlock *rw, int what, const char *file, int line)
+{
+
+  if (panicstr != NULL)
+    return;
+  switch (what) {
+  case RA_LOCKED:
+  case RA_LOCKED | RA_RECURSED:
+  case RA_LOCKED | RA_NOTRECURSED:
+  case RA_RLOCKED:
+#ifdef WITNESS
+    witness_assert(&rw->lock_object, what, file, line);
+#else
+    /*
+     * If some other thread has a write lock or we have one
+     * and are asserting a read lock, fail.  Also, if no one
+     * has a lock at all, fail.
+     */
+    if (rw->rw_lock == RW_UNLOCKED ||
+        (!(rw->rw_lock & RW_LOCK_READ) && (what == RA_RLOCKED ||
+        rw_wowner(rw) != curthread)))
+      panic("Lock %s not %slocked @ %s:%d\n",
+          rw->lock_object.lo_name, (what == RA_RLOCKED) ?
+          "read " : "", file, line);
+
+    if (!(rw->rw_lock & RW_LOCK_READ)) {
+      if (rw_recursed(rw)) {
+        if (what & RA_NOTRECURSED)
+          panic("Lock %s recursed @ %s:%d\n",
+              rw->lock_object.lo_name, file,
+              line);
+      } else if (what & RA_RECURSED)
+        panic("Lock %s not recursed @ %s:%d\n",
+            rw->lock_object.lo_name, file, line);
+    }
+#endif
+    break;
+  case RA_WLOCKED:
+  case RA_WLOCKED | RA_RECURSED:
+  case RA_WLOCKED | RA_NOTRECURSED:
+    if (rw_wowner(rw) != curthread)
+      panic("Lock %s not exclusively locked @ %s:%d\n",
+          rw->lock_object.lo_name, file, line);
+    if (rw_recursed(rw)) {
+      if (what & RA_NOTRECURSED)
+        panic("Lock %s recursed @ %s:%d\n",
+            rw->lock_object.lo_name, file, line);
+    } else if (what & RA_RECURSED)
+      panic("Lock %s not recursed @ %s:%d\n",
+          rw->lock_object.lo_name, file, line);
+    break;
+  case RA_UNLOCKED:
+#ifdef WITNESS
+    witness_assert(&rw->lock_object, what, file, line);
+#else
+    /*
+     * If we hold a write lock fail.  We can't reliably check
+     * to see if we hold a read lock or not.
+     */
+    if (rw_wowner(rw) == curthread)
+      panic("Lock %s exclusively locked @ %s:%d\n",
+          rw->lock_object.lo_name, file, line);
+#endif
+    break;
+  default:
+    panic("Unknown rw lock assertion: %d @ %s:%d", what, file,
+        line);
+  }
+}
+#endif /* INVARIANT_SUPPORT */