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91e040a79d
Older ARC700 cores (ARC750 specifically) lack instructions to implement atomic r-w-w. This is problematic for userspace libraries such as NPTL which need atomic primitives. So enable them by providing kernel assist. This is costly but really the only sane soluton (othern than tight spinning using the otherwise availiable atomic exchange EX instruciton). Good thing is there are only a few of these cores running Linux out in the wild. This only works on UP systems. Reviewed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/******** no-legacy-syscalls-ABI *******/
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/*
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* Non-typical guard macro to enable inclusion twice in ARCH sys.c
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* That is how the Generic syscall wrapper generator works
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*/
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#if !defined(_UAPI_ASM_ARC_UNISTD_H) || defined(__SYSCALL)
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#define _UAPI_ASM_ARC_UNISTD_H
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#define __ARCH_WANT_RENAMEAT
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#define __ARCH_WANT_SYS_EXECVE
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#define __ARCH_WANT_SYS_CLONE
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#define __ARCH_WANT_SYS_VFORK
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#define __ARCH_WANT_SYS_FORK
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#define sys_mmap2 sys_mmap_pgoff
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#include <asm-generic/unistd.h>
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#define NR_syscalls __NR_syscalls
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/* Generic syscall (fs/filesystems.c - lost in asm-generic/unistd.h */
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#define __NR_sysfs (__NR_arch_specific_syscall + 3)
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/* ARC specific syscall */
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#define __NR_cacheflush (__NR_arch_specific_syscall + 0)
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#define __NR_arc_settls (__NR_arch_specific_syscall + 1)
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#define __NR_arc_gettls (__NR_arch_specific_syscall + 2)
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#define __NR_arc_usr_cmpxchg (__NR_arch_specific_syscall + 4)
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__SYSCALL(__NR_cacheflush, sys_cacheflush)
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__SYSCALL(__NR_arc_settls, sys_arc_settls)
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__SYSCALL(__NR_arc_gettls, sys_arc_gettls)
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__SYSCALL(__NR_arc_usr_cmpxchg, sys_arc_usr_cmpxchg)
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__SYSCALL(__NR_sysfs, sys_sysfs)
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#undef __SYSCALL
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#endif
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