include/qemu/osdep.h

   1 /*
   2  * OS includes and handling of OS dependencies
   3  *
   4  * This header exists to pull in some common system headers that
   5  * most code in QEMU will want, and to fix up some possible issues with
   6  * it (missing defines, Windows weirdness, and so on).
   7  *
   8  * To avoid getting into possible circular include dependencies, this
   9  * file should not include any other QEMU headers, with the exceptions
  10  * of config-host.h, config-target.h, qemu/compiler.h,
  11  * sysemu/os-posix.h, sysemu/os-win32.h, glib-compat.h and
  12  * qemu/typedefs.h, all of which are doing a similar job to this file
  13  * and are under similar constraints.
  14  *
  15  * This header also contains prototypes for functions defined in
  16  * os-*.c and util/oslib-*.c; those would probably be better split
  17  * out into separate header files.
  18  *
  19  * In an ideal world this header would contain only:
  20  *  (1) things which everybody needs
  21  *  (2) things without which code would work on most platforms but
  22  *      fail to compile or misbehave on a minority of host OSes
  23  *
  24  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  25  * See the COPYING file in the top-level directory.
  26  */
  27 #ifndef QEMU_OSDEP_H
  28 #define QEMU_OSDEP_H
  29
  30 #include "config-host.h"
  31 #ifdef NEED_CPU_H
  32 #include "config-target.h"
  33 #else
  34 #include "exec/poison.h"
  35 #endif
  36 #ifdef __COVERITY__
  37 /* Coverity does not like the new _Float* types that are used by
  38  * recent glibc, and croaks on every single file that includes
  39  * stdlib.h.  These typedefs are enough to please it.
  40  *
  41  * Note that these fix parse errors so they cannot be placed in
  42  * scripts/coverity-model.c.
  43  */
  44 typedef float _Float32;
  45 typedef double _Float32x;
  46 typedef double _Float64;
  47 typedef __float80 _Float64x;
  48 typedef __float128 _Float128;
  49 #endif
  50
  51 #include "qemu/compiler.h"
  52
  53 /* Older versions of C++ don't get definitions of various macros from
  54  * stdlib.h unless we define these macros before first inclusion of
  55  * that system header.
  56  */
  57 #ifndef __STDC_CONSTANT_MACROS
  58 #define __STDC_CONSTANT_MACROS
  59 #endif
  60 #ifndef __STDC_LIMIT_MACROS
  61 #define __STDC_LIMIT_MACROS
  62 #endif
  63 #ifndef __STDC_FORMAT_MACROS
  64 #define __STDC_FORMAT_MACROS
  65 #endif
  66
  67 /* The following block of code temporarily renames the daemon() function so the
  68  * compiler does not see the warning associated with it in stdlib.h on OSX
  69  */
  70 #ifdef __APPLE__
  71 #define daemon qemu_fake_daemon_function
  72 #include <stdlib.h>
  73 #undef daemon
  74 extern int daemon(int, int);
  75 #endif
  76
  77 #include <stdarg.h>
  78 #include <stddef.h>
  79 #include <stdbool.h>
  80 #include <stdint.h>
  81 #include <sys/types.h>
  82 #include <stdlib.h>
  83 #include <stdio.h>
  84 #include <string.h>
  85 #include <strings.h>
  86 #include <inttypes.h>
  87 #include <limits.h>
  88 /* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
  89  * function availability on recentish Mingw-w64 platforms. */
  90 #include <unistd.h>
  91 #include <time.h>
  92 #include <ctype.h>
  93 #include <errno.h>
  94 #include <fcntl.h>
  95 #include <sys/stat.h>
  96 #include <sys/time.h>
  97 #include <assert.h>
  98 /* setjmp must be declared before sysemu/os-win32.h
  99  * because it is redefined there. */
 100 #include <setjmp.h>
 101 #include <signal.h>
 102
 103 #ifdef __OpenBSD__
 104 #include <sys/signal.h>
 105 #endif
 106
 107 #ifndef _WIN32
 108 #include <sys/wait.h>
 109 #else
 110 #define WIFEXITED(x)   1
 111 #define WEXITSTATUS(x) (x)
 112 #endif
 113
 114 #ifdef _WIN32
 115 #include "sysemu/os-win32.h"
 116 #endif
 117
 118 #ifdef CONFIG_POSIX
 119 #include "sysemu/os-posix.h"
 120 #endif
 121
 122 #include "glib-compat.h"
 123 #include "qemu/typedefs.h"
 124
 125 /*
 126  * According to waitpid man page:
 127  * WCOREDUMP
 128  *  This  macro  is  not  specified  in POSIX.1-2001 and is not
 129  *  available on some UNIX implementations (e.g., AIX, SunOS).
 130  *  Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif.
 131  */
 132 #ifndef WCOREDUMP
 133 #define WCOREDUMP(status) 0
 134 #endif
 135 /*
 136  * We have a lot of unaudited code that may fail in strange ways, or
 137  * even be a security risk during migration, if you disable assertions
 138  * at compile-time.  You may comment out these safety checks if you
 139  * absolutely want to disable assertion overhead, but it is not
 140  * supported upstream so the risk is all yours.  Meanwhile, please
 141  * submit patches to remove any side-effects inside an assertion, or
 142  * fixing error handling that should use Error instead of assert.
 143  */
 144 #ifdef NDEBUG
 145 #error building with NDEBUG is not supported
 146 #endif
 147 #ifdef G_DISABLE_ASSERT
 148 #error building with G_DISABLE_ASSERT is not supported
 149 #endif
 150
 151 #ifndef O_LARGEFILE
 152 #define O_LARGEFILE 0
 153 #endif
 154 #ifndef O_BINARY
 155 #define O_BINARY 0
 156 #endif
 157 #ifndef MAP_ANONYMOUS
 158 #define MAP_ANONYMOUS MAP_ANON
 159 #endif
 160 #ifndef ENOMEDIUM
 161 #define ENOMEDIUM ENODEV
 162 #endif
 163 #if !defined(ENOTSUP)
 164 #define ENOTSUP 4096
 165 #endif
 166 #if !defined(ECANCELED)
 167 #define ECANCELED 4097
 168 #endif
 169 #if !defined(EMEDIUMTYPE)
 170 #define EMEDIUMTYPE 4098
 171 #endif
 172 #if !defined(ESHUTDOWN)
 173 #define ESHUTDOWN 4099
 174 #endif
 175
 176 /* time_t may be either 32 or 64 bits depending on the host OS, and
 177  * can be either signed or unsigned, so we can't just hardcode a
 178  * specific maximum value. This is not a C preprocessor constant,
 179  * so you can't use TIME_MAX in an #ifdef, but for our purposes
 180  * this isn't a problem.
 181  */
 182
 183 /* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from
 184  * Gnulib, and are under the LGPL v2.1 or (at your option) any
 185  * later version.
 186  */
 187
 188 /* True if the real type T is signed.  */
 189 #define TYPE_SIGNED(t) (!((t)0 < (t)-1))
 190
 191 /* The width in bits of the integer type or expression T.
 192  * Padding bits are not supported.
 193  */
 194 #define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT)
 195
 196 /* The maximum and minimum values for the integer type T.  */
 197 #define TYPE_MAXIMUM(t)                                                \
 198   ((t) (!TYPE_SIGNED(t)                                                \
 199         ? (t)-1                                                        \
 200         : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1)))
 201
 202 #ifndef TIME_MAX
 203 #define TIME_MAX TYPE_MAXIMUM(time_t)
 204 #endif
 205
 206 /* HOST_LONG_BITS is the size of a native pointer in bits. */
 207 #if UINTPTR_MAX == UINT32_MAX
 208 # define HOST_LONG_BITS 32
 209 #elif UINTPTR_MAX == UINT64_MAX
 210 # define HOST_LONG_BITS 64
 211 #else
 212 # error Unknown pointer size
 213 #endif
 214
 215 /* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with
 216  * the wrong type. Our replacement isn't usable in preprocessor
 217  * expressions, but it is sufficient for our needs. */
 218 #if defined(HAVE_BROKEN_SIZE_MAX) && HAVE_BROKEN_SIZE_MAX
 219 #undef SIZE_MAX
 220 #define SIZE_MAX ((size_t)-1)
 221 #endif
 222
 223 #ifndef MIN
 224 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 225 #endif
 226 #ifndef MAX
 227 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 228 #endif
 229
 230 /* Minimum function that returns zero only iff both values are zero.
 231  * Intended for use with unsigned values only. */
 232 #ifndef MIN_NON_ZERO
 233 #define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
 234                                 ((b) == 0 ? (a) : (MIN(a, b))))
 235 #endif
 236
 237 /* Round number down to multiple */
 238 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 239
 240 /* Round number up to multiple. Safe when m is not a power of 2 (see
 241  * ROUND_UP for a faster version when a power of 2 is guaranteed) */
 242 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 243
 244 /* Check if n is a multiple of m */
 245 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
 246
 247 /* n-byte align pointer down */
 248 #define QEMU_ALIGN_PTR_DOWN(p, n) \
 249     ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
 250
 251 /* n-byte align pointer up */
 252 #define QEMU_ALIGN_PTR_UP(p, n) \
 253     ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
 254
 255 /* Check if pointer p is n-bytes aligned */
 256 #define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
 257
 258 /* Round number up to multiple. Requires that d be a power of 2 (see
 259  * QEMU_ALIGN_UP for a safer but slower version on arbitrary
 260  * numbers); works even if d is a smaller type than n.  */
 261 #ifndef ROUND_UP
 262 #define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d)))
 263 #endif
 264
 265 #ifndef DIV_ROUND_UP
 266 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 267 #endif
 268
 269 /*
 270  * &(x)[0] is always a pointer - if it's same type as x then the argument is a
 271  * pointer, not an array.
 272  */
 273 #define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
 274                                                         typeof(&(x)[0])))
 275 #ifndef ARRAY_SIZE
 276 #define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
 277                        QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
 278 #endif
 279
 280 int qemu_daemon(int nochdir, int noclose);
 281 void *qemu_try_memalign(size_t alignment, size_t size);
 282 void *qemu_memalign(size_t alignment, size_t size);
 283 void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared);
 284 void qemu_vfree(void *ptr);
 285 void qemu_anon_ram_free(void *ptr, size_t size);
 286
 287 #define QEMU_MADV_INVALID -1
 288
 289 #if defined(CONFIG_MADVISE)
 290
 291 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
 292 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
 293 #ifdef MADV_DONTFORK
 294 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
 295 #else
 296 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 297 #endif
 298 #ifdef MADV_MERGEABLE
 299 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 300 #else
 301 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 302 #endif
 303 #ifdef MADV_UNMERGEABLE
 304 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
 305 #else
 306 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 307 #endif
 308 #ifdef MADV_DODUMP
 309 #define QEMU_MADV_DODUMP MADV_DODUMP
 310 #else
 311 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 312 #endif
 313 #ifdef MADV_DONTDUMP
 314 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
 315 #else
 316 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 317 #endif
 318 #ifdef MADV_HUGEPAGE
 319 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
 320 #else
 321 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
 322 #endif
 323 #ifdef MADV_NOHUGEPAGE
 324 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
 325 #else
 326 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
 327 #endif
 328 #ifdef MADV_REMOVE
 329 #define QEMU_MADV_REMOVE MADV_REMOVE
 330 #else
 331 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 332 #endif
 333
 334 #elif defined(CONFIG_POSIX_MADVISE)
 335
 336 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 337 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 338 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 339 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 340 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 341 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 342 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 343 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 344 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 345 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 346
 347 #else /* no-op */
 348
 349 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 350 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 351 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 352 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 353 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 354 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 355 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 356 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 357 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 358 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 359
 360 #endif
 361
 362 #ifdef _WIN32
 363 #define HAVE_CHARDEV_SERIAL 1
 364 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__)    \
 365     || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
 366     || defined(__GLIBC__)
 367 #define HAVE_CHARDEV_SERIAL 1
 368 #endif
 369
 370 #if defined(__linux__) || defined(__FreeBSD__) ||               \
 371     defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 372 #define HAVE_CHARDEV_PARPORT 1
 373 #endif
 374
 375 #if defined(CONFIG_LINUX)
 376 #ifndef BUS_MCEERR_AR
 377 #define BUS_MCEERR_AR 4
 378 #endif
 379 #ifndef BUS_MCEERR_AO
 380 #define BUS_MCEERR_AO 5
 381 #endif
 382 #endif
 383
 384 #if defined(__linux__) && \
 385     (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
 386      || defined(__powerpc64__))
 387    /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
 388       Valgrind does not support alignments larger than 1 MiB,
 389       therefore we need special code which handles running on Valgrind. */
 390 #  define QEMU_VMALLOC_ALIGN (512 * 4096)
 391 #elif defined(__linux__) && defined(__s390x__)
 392    /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
 393 #  define QEMU_VMALLOC_ALIGN (256 * 4096)
 394 #elif defined(__linux__) && defined(__sparc__)
 395 #include <sys/shm.h>
 396 #  define QEMU_VMALLOC_ALIGN MAX(getpagesize(), SHMLBA)
 397 #else
 398 #  define QEMU_VMALLOC_ALIGN getpagesize()
 399 #endif
 400
 401 #ifdef CONFIG_POSIX
 402 struct qemu_signalfd_siginfo {
 403     uint32_t ssi_signo;   /* Signal number */
 404     int32_t  ssi_errno;   /* Error number (unused) */
 405     int32_t  ssi_code;    /* Signal code */
 406     uint32_t ssi_pid;     /* PID of sender */
 407     uint32_t ssi_uid;     /* Real UID of sender */
 408     int32_t  ssi_fd;      /* File descriptor (SIGIO) */
 409     uint32_t ssi_tid;     /* Kernel timer ID (POSIX timers) */
 410     uint32_t ssi_band;    /* Band event (SIGIO) */
 411     uint32_t ssi_overrun; /* POSIX timer overrun count */
 412     uint32_t ssi_trapno;  /* Trap number that caused signal */
 413     int32_t  ssi_status;  /* Exit status or signal (SIGCHLD) */
 414     int32_t  ssi_int;     /* Integer sent by sigqueue(2) */
 415     uint64_t ssi_ptr;     /* Pointer sent by sigqueue(2) */
 416     uint64_t ssi_utime;   /* User CPU time consumed (SIGCHLD) */
 417     uint64_t ssi_stime;   /* System CPU time consumed (SIGCHLD) */
 418     uint64_t ssi_addr;    /* Address that generated signal
 419                              (for hardware-generated signals) */
 420     uint8_t  pad[48];     /* Pad size to 128 bytes (allow for
 421                              additional fields in the future) */
 422 };
 423
 424 int qemu_signalfd(const sigset_t *mask);
 425 void sigaction_invoke(struct sigaction *action,
 426                       struct qemu_signalfd_siginfo *info);
 427 #endif
 428
 429 int qemu_madvise(void *addr, size_t len, int advice);
 430 int qemu_mprotect_rwx(void *addr, size_t size);
 431 int qemu_mprotect_none(void *addr, size_t size);
 432
 433 int qemu_open(const char *name, int flags, ...);
 434 int qemu_close(int fd);
 435 #ifndef _WIN32
 436 int qemu_dup(int fd);
 437 #endif
 438 int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
 439 int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 440 int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive);
 441 bool qemu_has_ofd_lock(void);
 442
 443 #if defined(__HAIKU__) && defined(__i386__)
 444 #define FMT_pid "%ld"
 445 #elif defined(WIN64)
 446 #define FMT_pid "%" PRId64
 447 #else
 448 #define FMT_pid "%d"
 449 #endif
 450
 451 int qemu_create_pidfile(const char *filename);
 452 int qemu_get_thread_id(void);
 453
 454 #ifndef CONFIG_IOVEC
 455 struct iovec {
 456     void *iov_base;
 457     size_t iov_len;
 458 };
 459 /*
 460  * Use the same value as Linux for now.
 461  */
 462 #define IOV_MAX 1024
 463
 464 ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
 465 ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 466 #else
 467 #include <sys/uio.h>
 468 #endif
 469
 470 #ifdef _WIN32
 471 static inline void qemu_timersub(const struct timeval *val1,
 472                                  const struct timeval *val2,
 473                                  struct timeval *res)
 474 {
 475     res->tv_sec = val1->tv_sec - val2->tv_sec;
 476     if (val1->tv_usec < val2->tv_usec) {
 477         res->tv_sec--;
 478         res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 479     } else {
 480         res->tv_usec = val1->tv_usec - val2->tv_usec;
 481     }
 482 }
 483 #else
 484 #define qemu_timersub timersub
 485 #endif
 486
 487 void qemu_set_cloexec(int fd);
 488
 489 /* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
 490  * instead of QEMU_VERSION, so setting hw_version on MachineClass
 491  * is no longer mandatory.
 492  *
 493  * Do NOT change this string, or it will break compatibility on all
 494  * machine classes that don't set hw_version.
 495  */
 496 #define QEMU_HW_VERSION "2.5+"
 497
 498 /* QEMU "hardware version" setting. Used to replace code that exposed
 499  * QEMU_VERSION to guests in the past and need to keep compatibility.
 500  * Do not use qemu_hw_version() in new code.
 501  */
 502 void qemu_set_hw_version(const char *);
 503 const char *qemu_hw_version(void);
 504
 505 void fips_set_state(bool requested);
 506 bool fips_get_state(void);
 507
 508 /* Return a dynamically allocated pathname denoting a file or directory that is
 509  * appropriate for storing local state.
 510  *
 511  * @relative_pathname need not start with a directory separator; one will be
 512  * added automatically.
 513  *
 514  * The caller is responsible for releasing the value returned with g_free()
 515  * after use.
 516  */
 517 char *qemu_get_local_state_pathname(const char *relative_pathname);
 518
 519 /* Find program directory, and save it for later usage with
 520  * qemu_get_exec_dir().
 521  * Try OS specific API first, if not working, parse from argv0. */
 522 void qemu_init_exec_dir(const char *argv0);
 523
 524 /* Get the saved exec dir.
 525  * Caller needs to release the returned string by g_free() */
 526 char *qemu_get_exec_dir(void);
 527
 528 /**
 529  * qemu_getauxval:
 530  * @type: the auxiliary vector key to lookup
 531  *
 532  * Search the auxiliary vector for @type, returning the value
 533  * or 0 if @type is not present.
 534  */
 535 unsigned long qemu_getauxval(unsigned long type);
 536
 537 void qemu_set_tty_echo(int fd, bool echo);
 538
 539 void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
 540                      Error **errp);
 541
 542 /**
 543  * qemu_get_pid_name:
 544  * @pid: pid of a process
 545  *
 546  * For given @pid fetch its name. Caller is responsible for
 547  * freeing the string when no longer needed.
 548  * Returns allocated string on success, NULL on failure.
 549  */
 550 char *qemu_get_pid_name(pid_t pid);
 551
 552 /**
 553  * qemu_fork:
 554  *
 555  * A version of fork that avoids signal handler race
 556  * conditions that can lead to child process getting
 557  * signals that are otherwise only expected by the
 558  * parent. It also resets all signal handlers to the
 559  * default settings.
 560  *
 561  * Returns 0 to child process, pid number to parent
 562  * or -1 on failure.
 563  */
 564 pid_t qemu_fork(Error **errp);
 565
 566 /* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
 567  * when intptr_t is 32-bit and we are aligning a long long.
 568  */
 569 extern uintptr_t qemu_real_host_page_size;
 570 extern intptr_t qemu_real_host_page_mask;
 571
 572 extern int qemu_icache_linesize;
 573 extern int qemu_dcache_linesize;
 574
 575 #endif