retire sparc

1 files changed, 0 insertions, 41 deletions

diff --git a/lib/librthread/arch/sparc/_atomic_lock.c b/lib/librthread/arch/sparc/_atomic_lock.c
deleted file mode 100644
index 9c95d05e844..00000000000
--- a/lib/librthread/arch/sparc/_atomic_lock.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*	$OpenBSD: _atomic_lock.c,v 1.5 2013/06/01 20:47:40 tedu Exp $	*/
-/* David Leonard, <d@csee.uq.edu.au>. Public domain. */
-
-/*
- * Atomic lock for sparc
- */
- 
-#include <machine/spinlock.h>
-
-int
-_atomic_lock(volatile _atomic_lock_t * lock)
-{
-	_atomic_lock_t old;
-
-	/*
-	 *  "  ldstub  [address], reg_rd
-	 * 
-	 *  The atomic load-store instructions copy a byte from memory
-	 *  into r[rd]m then rewrite the addressed byte in memory to all
-	 *  ones [_ATOMIC_LOCK_LOCKED]. The operation is performed
-	 *  atomically, that is, without allowing intervening interrupts
-	 *  or deferred traps. In a multiprocessor system, two or more
-	 *  processors executing atomic load-store unsigned byte [...]
-	 *  addressing the same byte [...] simultaneously are guaranteed
-	 *  to execute them in an undefined, but serial order."
-	 *    - p101, The SPARC Architecture Manual (version 8) Prentice-Hall
-	 *
-	 * "LDSTUB loads a byte value from memory to a register and writes
-	 *  the value FF_16 into the addressed byte atomically. LDSTUB
-	 *  is the classic test-and-set instruction. Like SWAP, it has
-	 *  a consensus number of two and so cannot resolve more than
-	 *  two contending processes in a wait-free fashion."
-	 *    - p129, The SPARC Architecture Manual (version 9) Prentice-Hall
-	 *  (See also section J.6 (spinlocks))
-	 *
-	 * (No change to the condition codes are documented.)
-	 */
-	__asm__("ldstub [%1], %0" : "=&r" (old) : "r" (lock) : "memory");
-
-	return (old == _ATOMIC_LOCK_LOCKED);
-}