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/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 * These routines make two important assumptions:
 *
 * 1. atomic_t is really an int and can be freely cast back and forth
 *    (validated in __init_atomic_per_cpu).
 *
 * 2. userspace uses sys_cmpxchg() for all atomic operations, thus using
 *    the same locking convention that all the kernel atomic routines use.
 */

#ifndef _ASM_TILE_FUTEX_H
#define _ASM_TILE_FUTEX_H

#ifndef __ASSEMBLY__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <asm/atomic.h>

/*
 * Support macros for futex operations.  Do not use these macros directly.
 * They assume "ret", "val", "oparg", and "uaddr" in the lexical context.
 * __futex_cmpxchg() additionally assumes "oldval".
 */

#ifdef __tilegx__

#define __futex_asm(OP) \
	asm("1: {" #OP " %1, %3, %4; movei %0, 0 }\n"		\
	    ".pushsection .fixup,\"ax\"\n"			\
	    "0: { movei %0, %5; j 9f }\n"			\
	    ".section __ex_table,\"a\"\n"			\
	    ".align 8\n"					\
	    ".quad 1b, 0b\n"					\
	    ".popsection\n"					\
	    "9:"						\
	    : "=r" (ret), "=r" (val), "+m" (*(uaddr))		\
	    : "r" (uaddr), "r" (oparg), "i" (-EFAULT))

#define __futex_set() __futex_asm(exch4)
#define __futex_add() __futex_asm(fetchadd4)
#define __futex_or() __futex_asm(fetchor4)
#define __futex_andn() ({ oparg = ~oparg; __futex_asm(fetchand4); })
#define __futex_cmpxchg() \
	({ __insn_mtspr(SPR_CMPEXCH_VALUE, oldval); __futex_asm(cmpexch4); })

#define __futex_xor()						\
	({							\
		u32 oldval, n = oparg;				\
		if ((ret = __get_user(oldval, uaddr)) == 0) {	\
			do {					\
				oparg = oldval ^ n;		\
				__futex_cmpxchg();		\
			} while (ret == 0 && oldval != val);	\
		}						\
	})

/* No need to prefetch, since the atomic ops go to the home cache anyway. */
#define __futex_prolog()

#else

#define __futex_call(FN)						\
	{								\
		struct __get_user gu = FN((u32 __force *)uaddr, lock, oparg); \
		val = gu.val;						\
		ret = gu.err;						\
	}

#define __futex_set() __futex_call(__atomic32_xchg)
#define __futex_add() __futex_call(__atomic32_xchg_add)
#define __futex_or() __futex_call(__atomic32_fetch_or)
#define __futex_andn() __futex_call(__atomic32_fetch_andn)
#define __futex_xor() __futex_call(__atomic32_fetch_xor)

#define __futex_cmpxchg()						\
	{								\
		struct __get_user gu = __atomic32_cmpxchg((u32 __force *)uaddr, \
							  lock, oldval, oparg); \
		val = gu.val;						\
		ret = gu.err;						\
	}

/*
 * Find the lock pointer for the atomic calls to use, and issue a
 * prefetch to the user address to bring it into cache.  Similar to
 * __atomic_setup(), but we can't do a read into the L1 since it might
 * fault; instead we do a prefetch into the L2.
 */
#define __futex_prolog()					\
	int *lock;						\
	__insn_prefetch(uaddr);					\
	lock = __atomic_hashed_lock((int __force *)uaddr)
#endif

static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
		u32 __user *uaddr)
{
	int uninitialized_var(val), ret;

	__futex_prolog();

	/* The 32-bit futex code makes this assumption, so validate it here. */
	BUILD_BUG_ON(sizeof(atomic_t) != sizeof(int));

	pagefault_disable();
	switch (op) {
	case FUTEX_OP_SET:
		__futex_set();
		break;
	case FUTEX_OP_ADD:
		__futex_add();
		break;
	case FUTEX_OP_OR:
		__futex_or();
		break;
	case FUTEX_OP_ANDN:
		__futex_andn();
		break;
	case FUTEX_OP_XOR:
		__futex_xor();
		break;
	default:
		ret = -ENOSYS;
		break;
	}
	pagefault_enable();

	if (!ret)
		*oval = val;

	return ret;
}

static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
						u32 oldval, u32 oparg)
{
	int ret, val;

	__futex_prolog();

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	__futex_cmpxchg();

	*uval = val;
	return ret;
}

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_TILE_FUTEX_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 439 B 0644
asm-offsets.h File 35 B 0644
atomic.h File 5.14 KB 0644
atomic_32.h File 8.91 KB 0644
atomic_64.h File 5.51 KB 0644
backtrace.h File 3.98 KB 0644
barrier.h File 2.89 KB 0644
bitops.h File 2.37 KB 0644
bitops_32.h File 4.01 KB 0644
bitops_64.h File 2.67 KB 0644
cache.h File 2.6 KB 0644
cacheflush.h File 4.94 KB 0644
checksum.h File 1.23 KB 0644
cmpxchg.h File 3.47 KB 0644
compat.h File 7.38 KB 0644
current.h File 947 B 0644
delay.h File 1.1 KB 0644
device.h File 978 B 0644
div64.h File 319 B 0644
dma-mapping.h File 1.82 KB 0644
dma.h File 762 B 0644
elf.h File 5.42 KB 0644
fixmap.h File 2.73 KB 0644
ftrace.h File 1.08 KB 0644
futex.h File 4.23 KB 0644
hardirq.h File 1.28 KB 0644
hardwall.h File 1.08 KB 0644
highmem.h File 2.08 KB 0644
homecache.h File 4.21 KB 0644
hugetlb.h File 3.04 KB 0644
hv_driver.h File 1.92 KB 0644
ide.h File 758 B 0644
insn.h File 1.79 KB 0644
io.h File 12.43 KB 0644
irq.h File 3.11 KB 0644
irq_work.h File 283 B 0644
irqflags.h File 10.55 KB 0644
jump_label.h File 1.47 KB 0644
kdebug.h File 769 B 0644
kexec.h File 2.23 KB 0644
kgdb.h File 1.99 KB 0644
kmap_types.h File 1.02 KB 0644
kprobes.h File 2.19 KB 0644
linkage.h File 1.46 KB 0644
mmu.h File 965 B 0644
mmu_context.h File 4.5 KB 0644
mmzone.h File 2.07 KB 0644
module.h File 1.12 KB 0644
page.h File 10.32 KB 0644
pci.h File 6.58 KB 0644
percpu.h File 1.79 KB 0644
perf_event.h File 766 B 0644
pgalloc.h File 4.76 KB 0644
pgtable.h File 15.66 KB 0644
pgtable_32.h File 4.08 KB 0644
pgtable_64.h File 5.11 KB 0644
pmc.h File 2.15 KB 0644
processor.h File 10.62 KB 0644
ptrace.h File 2.96 KB 0644
sections.h File 1.37 KB 0644
setup.h File 1.63 KB 0644
sigframe.h File 956 B 0644
signal.h File 1.07 KB 0644
smp.h File 3.98 KB 0644
spinlock.h File 741 B 0644
spinlock_32.h File 2.9 KB 0644
spinlock_64.h File 3.88 KB 0644
spinlock_types.h File 1.58 KB 0644
stack.h File 2.59 KB 0644
string.h File 1.19 KB 0644
switch_to.h File 2.75 KB 0644
syscall.h File 2.88 KB 0644
syscalls.h File 2.35 KB 0644
thread_info.h File 5.54 KB 0644
tile-desc.h File 650 B 0644
tile-desc_32.h File 12.54 KB 0644
tile-desc_64.h File 10.83 KB 0644
timex.h File 1.71 KB 0644
tlb.h File 878 B 0644
tlbflush.h File 3.99 KB 0644
topology.h File 1.52 KB 0644
traps.h File 2.44 KB 0644
uaccess.h File 12.77 KB 0644
unaligned.h File 1.56 KB 0644
unistd.h File 777 B 0644
user.h File 717 B 0644
vdso.h File 1.84 KB 0644
vga.h File 1.05 KB 0644
word-at-a-time.h File 1.07 KB 0644