forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* Generic cache management functions. Everything is arch-specific,
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* but this header exists to make sure the defines/functions can be
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* used in a generic way.
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*
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* 2000-11-13 Arjan van de Ven <arjan@fenrus.demon.nl>
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*
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*/
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#ifndef _LINUX_PREFETCH_H
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#define _LINUX_PREFETCH_H
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#include <linux/types.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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/*
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prefetch(x) attempts to pre-emptively get the memory pointed to
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by address "x" into the CPU L1 cache.
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prefetch(x) should not cause any kind of exception, prefetch(0) is
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specifically ok.
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prefetch() should be defined by the architecture, if not, the
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#define below provides a no-op define.
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There are 3 prefetch() macros:
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prefetch(x) - prefetches the cacheline at "x" for read
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prefetchw(x) - prefetches the cacheline at "x" for write
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spin_lock_prefetch(x) - prefetches the spinlock *x for taking
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there is also PREFETCH_STRIDE which is the architecure-preferred
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"lookahead" size for prefetching streamed operations.
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*/
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#ifndef ARCH_HAS_PREFETCH
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#define prefetch(x) __builtin_prefetch(x)
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#endif
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#ifndef ARCH_HAS_PREFETCHW
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#define prefetchw(x) __builtin_prefetch(x,1)
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#endif
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#ifndef ARCH_HAS_SPINLOCK_PREFETCH
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#define spin_lock_prefetch(x) prefetchw(x)
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#endif
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#ifndef PREFETCH_STRIDE
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#define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
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#endif
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static inline void prefetch_range(void *addr, size_t len)
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{
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#ifdef ARCH_HAS_PREFETCH
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char *cp;
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char *end = addr + len;
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for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
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prefetch(cp);
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#endif
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}
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#endif
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