4a556f4f56
This change creates the framework for vDSO calls, makes the existing rt_sigreturn() mechanism use it, and adds a fast gettimeofday(). Now that we need to expose the vDSO address to userspace, we add AT_SYSINFO_EHDR to the set of aux entries provided to userspace. (You can disable any extra vDSO support by booting with vdso=0, but the rt_sigreturn vDSO page will still be provided.) Note that glibc has supported the tile vDSO since release 2.17. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
32 lines
965 B
C
32 lines
965 B
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_MMU_H
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#define _ASM_TILE_MMU_H
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/* Capture any arch- and mm-specific information. */
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struct mm_context {
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/*
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* Written under the mmap_sem semaphore; read without the
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* semaphore but atomically, but it is conservatively set.
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*/
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unsigned long priority_cached;
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unsigned long vdso_base;
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};
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typedef struct mm_context mm_context_t;
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void leave_mm(int cpu);
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#endif /* _ASM_TILE_MMU_H */
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