Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (49 commits)
  MIPS: RB532: provide GPIO_BUILTIN_NR and irq_to_gpio/gpio_to_irq
  MIPS: Move ptrace prototypes to ptrace.h
  MIPS: Ptrace support for HARDWARE_WATCHPOINTS
  MIPS: Scheduler support for HARDWARE_WATCHPOINTS.
  MIPS: Watch exception handling for HARDWARE_WATCHPOINTS.
  MIPS: Probe watch registers and report configuration.
  MIPS: Add HARDWARE_WATCHPOINTS definitions and support code.
  MIPS: Add HARDWARE_WATCHPOINTS configure option.
  MIPS: Replace use of <asm-generic/uaccess.h> with native implementations.
  MIPS: TXx9: Add TX4939 ATA support (v2)
  MIPS: Rewrite spinlocks to ticket locks.
  MIPS: IP checksums: Optimize adjust of sum on buffers of odd alignment.
  MIPS: IP checksums: Remove unncessary .set pseudos
  MIPS: IP checksums: Remove unncessary folding of sum to 16 bit.
  MIPS: Move headfiles to new location below arch/mips/include
  MIPS: Alchemy: rename directory
  MIPS: Optimize get_user and put_user for 64-bit
  MIPS: TXx9: Implement prom_free_prom_memory
  MIPS: TXx9: Add RBTX4939 board support
  MIPS: TXx9: Add TX4939 SoC support
  ...

1 files changed, 203 insertions, 0 deletions

diff --git a/arch/mips/include/asm/futex.h b/arch/mips/include/asm/futex.h
new file mode 100644
index 00000000000..b9cce90346c
--- /dev/null
+++ b/arch/mips/include/asm/futex.h
@@ -0,0 +1,203 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2006  Ralf Baechle (ralf@linux-mips.org)
+ */
+#ifndef _ASM_FUTEX_H
+#define _ASM_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+#include <linux/uaccess.h>
+#include <asm/barrier.h>
+#include <asm/errno.h>
+#include <asm/war.h>
+
+#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg)		\
+{									\
+	if (cpu_has_llsc && R10000_LLSC_WAR) {				\
+		__asm__ __volatile__(					\
+		"	.set	push				\n"	\
+		"	.set	noat				\n"	\
+		"	.set	mips3				\n"	\
+		"1:	ll	%1, %4	# __futex_atomic_op	\n"	\
+		"	.set	mips0				\n"	\
+		"	" insn	"				\n"	\
+		"	.set	mips3				\n"	\
+		"2:	sc	$1, %2				\n"	\
+		"	beqzl	$1, 1b				\n"	\
+		__WEAK_LLSC_MB						\
+		"3:						\n"	\
+		"	.set	pop				\n"	\
+		"	.set	mips0				\n"	\
+		"	.section .fixup,\"ax\"			\n"	\
+		"4:	li	%0, %6				\n"	\
+		"	j	3b				\n"	\
+		"	.previous				\n"	\
+		"	.section __ex_table,\"a\"		\n"	\
+		"	"__UA_ADDR "\t1b, 4b			\n"	\
+		"	"__UA_ADDR "\t2b, 4b			\n"	\
+		"	.previous				\n"	\
+		: "=r" (ret), "=&r" (oldval), "=R" (*uaddr)		\
+		: "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT)	\
+		: "memory");						\
+	} else if (cpu_has_llsc) {					\
+		__asm__ __volatile__(					\
+		"	.set	push				\n"	\
+		"	.set	noat				\n"	\
+		"	.set	mips3				\n"	\
+		"1:	ll	%1, %4	# __futex_atomic_op	\n"	\
+		"	.set	mips0				\n"	\
+		"	" insn	"				\n"	\
+		"	.set	mips3				\n"	\
+		"2:	sc	$1, %2				\n"	\
+		"	beqz	$1, 1b				\n"	\
+		__WEAK_LLSC_MB						\
+		"3:						\n"	\
+		"	.set	pop				\n"	\
+		"	.set	mips0				\n"	\
+		"	.section .fixup,\"ax\"			\n"	\
+		"4:	li	%0, %6				\n"	\
+		"	j	3b				\n"	\
+		"	.previous				\n"	\
+		"	.section __ex_table,\"a\"		\n"	\
+		"	"__UA_ADDR "\t1b, 4b			\n"	\
+		"	"__UA_ADDR "\t2b, 4b			\n"	\
+		"	.previous				\n"	\
+		: "=r" (ret), "=&r" (oldval), "=R" (*uaddr)		\
+		: "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT)	\
+		: "memory");						\
+	} else								\
+		ret = -ENOSYS;						\
+}
+
+static inline int
+futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
+{
+	int op = (encoded_op >> 28) & 7;
+	int cmp = (encoded_op >> 24) & 15;
+	int oparg = (encoded_op << 8) >> 20;
+	int cmparg = (encoded_op << 20) >> 20;
+	int oldval = 0, ret;
+	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+		oparg = 1 << oparg;
+
+	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
+		return -EFAULT;
+
+	pagefault_disable();
+
+	switch (op) {
+	case FUTEX_OP_SET:
+		__futex_atomic_op("move	$1, %z5", ret, oldval, uaddr, oparg);
+		break;
+
+	case FUTEX_OP_ADD:
+		__futex_atomic_op("addu	$1, %1, %z5",
+		                  ret, oldval, uaddr, oparg);
+		break;
+	case FUTEX_OP_OR:
+		__futex_atomic_op("or	$1, %1, %z5",
+		                  ret, oldval, uaddr, oparg);
+		break;
+	case FUTEX_OP_ANDN:
+		__futex_atomic_op("and	$1, %1, %z5",
+		                  ret, oldval, uaddr, ~oparg);
+		break;
+	case FUTEX_OP_XOR:
+		__futex_atomic_op("xor	$1, %1, %z5",
+		                  ret, oldval, uaddr, oparg);
+		break;
+	default:
+		ret = -ENOSYS;
+	}
+
+	pagefault_enable();
+
+	if (!ret) {
+		switch (cmp) {
+		case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+		case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+		case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+		case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+		case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+		case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+		default: ret = -ENOSYS;
+		}
+	}
+	return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+{
+	int retval;
+
+	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+		return -EFAULT;
+
+	if (cpu_has_llsc && R10000_LLSC_WAR) {
+		__asm__ __volatile__(
+		"# futex_atomic_cmpxchg_inatomic			\n"
+		"	.set	push					\n"
+		"	.set	noat					\n"
+		"	.set	mips3					\n"
+		"1:	ll	%0, %2					\n"
+		"	bne	%0, %z3, 3f				\n"
+		"	.set	mips0					\n"
+		"	move	$1, %z4					\n"
+		"	.set	mips3					\n"
+		"2:	sc	$1, %1					\n"
+		"	beqzl	$1, 1b					\n"
+		__WEAK_LLSC_MB
+		"3:							\n"
+		"	.set	pop					\n"
+		"	.section .fixup,\"ax\"				\n"
+		"4:	li	%0, %5					\n"
+		"	j	3b					\n"
+		"	.previous					\n"
+		"	.section __ex_table,\"a\"			\n"
+		"	"__UA_ADDR "\t1b, 4b				\n"
+		"	"__UA_ADDR "\t2b, 4b				\n"
+		"	.previous					\n"
+		: "=&r" (retval), "=R" (*uaddr)
+		: "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
+		: "memory");
+	} else if (cpu_has_llsc) {
+		__asm__ __volatile__(
+		"# futex_atomic_cmpxchg_inatomic			\n"
+		"	.set	push					\n"
+		"	.set	noat					\n"
+		"	.set	mips3					\n"
+		"1:	ll	%0, %2					\n"
+		"	bne	%0, %z3, 3f				\n"
+		"	.set	mips0					\n"
+		"	move	$1, %z4					\n"
+		"	.set	mips3					\n"
+		"2:	sc	$1, %1					\n"
+		"	beqz	$1, 1b					\n"
+		__WEAK_LLSC_MB
+		"3:							\n"
+		"	.set	pop					\n"
+		"	.section .fixup,\"ax\"				\n"
+		"4:	li	%0, %5					\n"
+		"	j	3b					\n"
+		"	.previous					\n"
+		"	.section __ex_table,\"a\"			\n"
+		"	"__UA_ADDR "\t1b, 4b				\n"
+		"	"__UA_ADDR "\t2b, 4b				\n"
+		"	.previous					\n"
+		: "=&r" (retval), "=R" (*uaddr)
+		: "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
+		: "memory");
+	} else
+		return -ENOSYS;
+
+	return retval;
+}
+
+#endif
+#endif /* _ASM_FUTEX_H */