path: root/include/qemu/madvise.h

/*
 * QEMU madvise wrapper functions
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#ifndef QEMU_MADVISE_H
#define QEMU_MADVISE_H

#define QEMU_MADV_INVALID -1

#if defined(CONFIG_MADVISE)

#define QEMU_MADV_WILLNEED  MADV_WILLNEED
#define QEMU_MADV_DONTNEED  MADV_DONTNEED
#ifdef MADV_DONTFORK
#define QEMU_MADV_DONTFORK  MADV_DONTFORK
#else
#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
#endif
#ifdef MADV_MERGEABLE
#define QEMU_MADV_MERGEABLE MADV_MERGEABLE
#else
#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
#endif
#ifdef MADV_UNMERGEABLE
#define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
#else
#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
#endif
#ifdef MADV_DODUMP
#define QEMU_MADV_DODUMP MADV_DODUMP
#else
#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
#endif
#ifdef MADV_DONTDUMP
#define QEMU_MADV_DONTDUMP MADV_DONTDUMP
#else
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#endif
#ifdef MADV_HUGEPAGE
#define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
#else
#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
#endif
#ifdef MADV_NOHUGEPAGE
#define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
#else
#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
#endif
#ifdef MADV_REMOVE
#define QEMU_MADV_REMOVE MADV_REMOVE
#else
#define QEMU_MADV_REMOVE QEMU_MADV_DONTNEED
#endif
#ifdef MADV_POPULATE_WRITE
#define QEMU_MADV_POPULATE_WRITE MADV_POPULATE_WRITE
#else
#define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID
#endif

#elif defined(CONFIG_POSIX_MADVISE)

#define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
#define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
#define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
#define QEMU_MADV_REMOVE QEMU_MADV_DONTNEED
#define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID

#else /* no-op */

#define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
#define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
#define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
#define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
#define QEMU_MADV_REMOVE QEMU_MADV_INVALID
#define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID

#endif

int qemu_madvise(void *addr, size_t len, int advice);

#endif