LXR qemu/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
  37#include "qemu/compiler.h"
  38
  39/* Older versions of C++ don't get definitions of various macros from
  40 * stdlib.h unless we define these macros before first inclusion of
  41 * that system header.
  42 */
  43#ifndef __STDC_CONSTANT_MACROS
  44#define __STDC_CONSTANT_MACROS
  45#endif
  46#ifndef __STDC_LIMIT_MACROS
  47#define __STDC_LIMIT_MACROS
  48#endif
  49#ifndef __STDC_FORMAT_MACROS
  50#define __STDC_FORMAT_MACROS
  51#endif
  52
  53/* The following block of code temporarily renames the daemon() function so the
  54 * compiler does not see the warning associated with it in stdlib.h on OSX
  55 */
  56#ifdef __APPLE__
  57#define daemon qemu_fake_daemon_function
  58#include <stdlib.h>
  59#undef daemon
  60extern int daemon(int, int);
  61#endif
  62
  63#ifdef _WIN32
  64/* as defined in sdkddkver.h */
  65#ifndef _WIN32_WINNT
  66#define _WIN32_WINNT 0x0600 /* Vista */
  67#endif
  68/* reduces the number of implicitly included headers */
  69#ifndef WIN32_LEAN_AND_MEAN
  70#define WIN32_LEAN_AND_MEAN
  71#endif
  72#endif
  73
  74/* enable C99/POSIX format strings (needs mingw32-runtime 3.15 or later) */
  75#ifdef __MINGW32__
  76#define __USE_MINGW_ANSI_STDIO 1
  77#endif
  78
  79#include <stdarg.h>
  80#include <stddef.h>
  81#include <stdbool.h>
  82#include <stdint.h>
  83#include <sys/types.h>
  84#include <stdlib.h>
  85#include <stdio.h>
  86
  87#include <string.h>
  88#include <strings.h>
  89#include <inttypes.h>
  90#include <limits.h>
  91/* Put unistd.h before time.h as that triggers localtime_r/gmtime_r
  92 * function availability on recentish Mingw-w64 platforms. */
  93#include <unistd.h>
  94#include <time.h>
  95#include <ctype.h>
  96#include <errno.h>
  97#include <fcntl.h>
  98#include <getopt.h>
  99#include <sys/stat.h>
 100#include <sys/time.h>
 101#include <assert.h>
 102/* setjmp must be declared before sysemu/os-win32.h
 103 * because it is redefined there. */
 104#include <setjmp.h>
 105#include <signal.h>
 106
 107#ifdef __OpenBSD__
 108#include <sys/signal.h>
 109#endif
 110
 111#ifndef _WIN32
 112#include <sys/wait.h>
 113#else
 114#define WIFEXITED(x)   1
 115#define WEXITSTATUS(x) (x)
 116#endif
 117
 118#ifdef _WIN32
 119#include "sysemu/os-win32.h"
 120#endif
 121
 122#ifdef CONFIG_POSIX
 123#include "sysemu/os-posix.h"
 124#endif
 125
 126#include "glib-compat.h"
 127#include "qemu/typedefs.h"
 128
 129/*
 130 * For mingw, as of v6.0.0, the function implementing the assert macro is
 131 * not marked as noreturn, so the compiler cannot delete code following an
 132 * assert(false) as unused.  We rely on this within the code base to delete
 133 * code that is unreachable when features are disabled.
 134 * All supported versions of Glib's g_assert() satisfy this requirement.
 135 */
 136#ifdef __MINGW32__
 137#undef assert
 138#define assert(x)  g_assert(x)
 139#endif
 140
 141/*
 142 * According to waitpid man page:
 143 * WCOREDUMP
 144 *  This  macro  is  not  specified  in POSIX.1-2001 and is not
 145 *  available on some UNIX implementations (e.g., AIX, SunOS).
 146 *  Therefore, enclose its use inside #ifdef WCOREDUMP ... #endif.
 147 */
 148#ifndef WCOREDUMP
 149#define WCOREDUMP(status) 0
 150#endif
 151/*
 152 * We have a lot of unaudited code that may fail in strange ways, or
 153 * even be a security risk during migration, if you disable assertions
 154 * at compile-time.  You may comment out these safety checks if you
 155 * absolutely want to disable assertion overhead, but it is not
 156 * supported upstream so the risk is all yours.  Meanwhile, please
 157 * submit patches to remove any side-effects inside an assertion, or
 158 * fixing error handling that should use Error instead of assert.
 159 */
 160#ifdef NDEBUG
 161#error building with NDEBUG is not supported
 162#endif
 163#ifdef G_DISABLE_ASSERT
 164#error building with G_DISABLE_ASSERT is not supported
 165#endif
 166
 167#ifndef O_LARGEFILE
 168#define O_LARGEFILE 0
 169#endif
 170#ifndef O_BINARY
 171#define O_BINARY 0
 172#endif
 173#ifndef MAP_ANONYMOUS
 174#define MAP_ANONYMOUS MAP_ANON
 175#endif
 176#ifndef ENOMEDIUM
 177#define ENOMEDIUM ENODEV
 178#endif
 179#if !defined(ENOTSUP)
 180#define ENOTSUP 4096
 181#endif
 182#if !defined(ECANCELED)
 183#define ECANCELED 4097
 184#endif
 185#if !defined(EMEDIUMTYPE)
 186#define EMEDIUMTYPE 4098
 187#endif
 188#if !defined(ESHUTDOWN)
 189#define ESHUTDOWN 4099
 190#endif
 191
 192/* time_t may be either 32 or 64 bits depending on the host OS, and
 193 * can be either signed or unsigned, so we can't just hardcode a
 194 * specific maximum value. This is not a C preprocessor constant,
 195 * so you can't use TIME_MAX in an #ifdef, but for our purposes
 196 * this isn't a problem.
 197 */
 198
 199/* The macros TYPE_SIGNED, TYPE_WIDTH, and TYPE_MAXIMUM are from
 200 * Gnulib, and are under the LGPL v2.1 or (at your option) any
 201 * later version.
 202 */
 203
 204/* True if the real type T is signed.  */
 205#define TYPE_SIGNED(t) (!((t)0 < (t)-1))
 206
 207/* The width in bits of the integer type or expression T.
 208 * Padding bits are not supported.
 209 */
 210#define TYPE_WIDTH(t) (sizeof(t) * CHAR_BIT)
 211
 212/* The maximum and minimum values for the integer type T.  */
 213#define TYPE_MAXIMUM(t)                                                \
 214  ((t) (!TYPE_SIGNED(t)                                                \
 215        ? (t)-1                                                        \
 216        : ((((t)1 << (TYPE_WIDTH(t) - 2)) - 1) * 2 + 1)))
 217
 218#ifndef TIME_MAX
 219#define TIME_MAX TYPE_MAXIMUM(time_t)
 220#endif
 221
 222/* HOST_LONG_BITS is the size of a native pointer in bits. */
 223#if UINTPTR_MAX == UINT32_MAX
 224# define HOST_LONG_BITS 32
 225#elif UINTPTR_MAX == UINT64_MAX
 226# define HOST_LONG_BITS 64
 227#else
 228# error Unknown pointer size
 229#endif
 230
 231/* Mac OSX has a <stdint.h> bug that incorrectly defines SIZE_MAX with
 232 * the wrong type. Our replacement isn't usable in preprocessor
 233 * expressions, but it is sufficient for our needs. */
 234#if defined(HAVE_BROKEN_SIZE_MAX) && HAVE_BROKEN_SIZE_MAX
 235#undef SIZE_MAX
 236#define SIZE_MAX ((size_t)-1)
 237#endif
 238
 239#ifndef MIN
 240#define MIN(a, b) (((a) < (b)) ? (a) : (b))
 241#endif
 242#ifndef MAX
 243#define MAX(a, b) (((a) > (b)) ? (a) : (b))
 244#endif
 245
 246/* Minimum function that returns zero only iff both values are zero.
 247 * Intended for use with unsigned values only. */
 248#ifndef MIN_NON_ZERO
 249#define MIN_NON_ZERO(a, b) ((a) == 0 ? (b) : \
 250                                ((b) == 0 ? (a) : (MIN(a, b))))
 251#endif
 252
 253/* Round number down to multiple */
 254#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 255
 256/* Round number up to multiple. Safe when m is not a power of 2 (see
 257 * ROUND_UP for a faster version when a power of 2 is guaranteed) */
 258#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 259
 260/* Check if n is a multiple of m */
 261#define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
 262
 263/* n-byte align pointer down */
 264#define QEMU_ALIGN_PTR_DOWN(p, n) \
 265    ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
 266
 267/* n-byte align pointer up */
 268#define QEMU_ALIGN_PTR_UP(p, n) \
 269    ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
 270
 271/* Check if pointer p is n-bytes aligned */
 272#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
 273
 274/* Round number up to multiple. Requires that d be a power of 2 (see
 275 * QEMU_ALIGN_UP for a safer but slower version on arbitrary
 276 * numbers); works even if d is a smaller type than n.  */
 277#ifndef ROUND_UP
 278#define ROUND_UP(n, d) (((n) + (d) - 1) & -(0 ? (n) : (d)))
 279#endif
 280
 281#ifndef DIV_ROUND_UP
 282#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
 283#endif
 284
 285/*
 286 * &(x)[0] is always a pointer - if it's same type as x then the argument is a
 287 * pointer, not an array.
 288 */
 289#define QEMU_IS_ARRAY(x) (!__builtin_types_compatible_p(typeof(x), \
 290                                                        typeof(&(x)[0])))
 291#ifndef ARRAY_SIZE
 292#define ARRAY_SIZE(x) ((sizeof(x) / sizeof((x)[0])) + \
 293                       QEMU_BUILD_BUG_ON_ZERO(!QEMU_IS_ARRAY(x)))
 294#endif
 295
 296int qemu_daemon(int nochdir, int noclose);
 297void *qemu_try_memalign(size_t alignment, size_t size);
 298void *qemu_memalign(size_t alignment, size_t size);
 299void *qemu_anon_ram_alloc(size_t size, uint64_t *align, bool shared);
 300void qemu_vfree(void *ptr);
 301void qemu_anon_ram_free(void *ptr, size_t size);
 302
 303#define QEMU_MADV_INVALID -1
 304
 305#if defined(CONFIG_MADVISE)
 306
 307#define QEMU_MADV_WILLNEED  MADV_WILLNEED
 308#define QEMU_MADV_DONTNEED  MADV_DONTNEED
 309#ifdef MADV_DONTFORK
 310#define QEMU_MADV_DONTFORK  MADV_DONTFORK
 311#else
 312#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 313#endif
 314#ifdef MADV_MERGEABLE
 315#define QEMU_MADV_MERGEABLE MADV_MERGEABLE
 316#else
 317#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 318#endif
 319#ifdef MADV_UNMERGEABLE
 320#define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
 321#else
 322#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 323#endif
 324#ifdef MADV_DODUMP
 325#define QEMU_MADV_DODUMP MADV_DODUMP
 326#else
 327#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 328#endif
 329#ifdef MADV_DONTDUMP
 330#define QEMU_MADV_DONTDUMP MADV_DONTDUMP
 331#else
 332#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 333#endif
 334#ifdef MADV_HUGEPAGE
 335#define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
 336#else
 337#define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
 338#endif
 339#ifdef MADV_NOHUGEPAGE
 340#define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
 341#else
 342#define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
 343#endif
 344#ifdef MADV_REMOVE
 345#define QEMU_MADV_REMOVE MADV_REMOVE
 346#else
 347#define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 348#endif
 349
 350#elif defined(CONFIG_POSIX_MADVISE)
 351
 352#define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
 353#define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
 354#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 355#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 356#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 357#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 358#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 359#define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 360#define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 361#define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 362
 363#else /* no-op */
 364
 365#define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
 366#define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
 367#define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
 368#define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
 369#define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
 370#define QEMU_MADV_DODUMP QEMU_MADV_INVALID
 371#define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
 372#define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
 373#define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
 374#define QEMU_MADV_REMOVE QEMU_MADV_INVALID
 375
 376#endif
 377
 378#ifdef _WIN32
 379#define HAVE_CHARDEV_SERIAL 1
 380#elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__)    \
 381    || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
 382    || defined(__GLIBC__)
 383#define HAVE_CHARDEV_SERIAL 1
 384#endif
 385
 386#if defined(__linux__) || defined(__FreeBSD__) ||               \
 387    defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 388#define HAVE_CHARDEV_PARPORT 1
 389#endif
 390
 391#if defined(CONFIG_LINUX)
 392#ifndef BUS_MCEERR_AR
 393#define BUS_MCEERR_AR 4
 394#endif
 395#ifndef BUS_MCEERR_AO
 396#define BUS_MCEERR_AO 5
 397#endif
 398#endif
 399
 400#if defined(__linux__) && \
 401    (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
 402     || defined(__powerpc64__))
 403   /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
 404      Valgrind does not support alignments larger than 1 MiB,
 405      therefore we need special code which handles running on Valgrind. */
 406#  define QEMU_VMALLOC_ALIGN (512 * 4096)
 407#elif defined(__linux__) && defined(__s390x__)
 408   /* Use 1 MiB (segment size) alignment so gmap can be used by KVM. */
 409#  define QEMU_VMALLOC_ALIGN (256 * 4096)
 410#elif defined(__linux__) && defined(__sparc__)
 411#include <sys/shm.h>
 412#  define QEMU_VMALLOC_ALIGN MAX(qemu_real_host_page_size, SHMLBA)
 413#else
 414#  define QEMU_VMALLOC_ALIGN qemu_real_host_page_size
 415#endif
 416
 417#ifdef CONFIG_POSIX
 418struct qemu_signalfd_siginfo {
 419    uint32_t ssi_signo;   /* Signal number */
 420    int32_t  ssi_errno;   /* Error number (unused) */
 421    int32_t  ssi_code;    /* Signal code */
 422    uint32_t ssi_pid;     /* PID of sender */
 423    uint32_t ssi_uid;     /* Real UID of sender */
 424    int32_t  ssi_fd;      /* File descriptor (SIGIO) */
 425    uint32_t ssi_tid;     /* Kernel timer ID (POSIX timers) */
 426    uint32_t ssi_band;    /* Band event (SIGIO) */
 427    uint32_t ssi_overrun; /* POSIX timer overrun count */
 428    uint32_t ssi_trapno;  /* Trap number that caused signal */
 429    int32_t  ssi_status;  /* Exit status or signal (SIGCHLD) */
 430    int32_t  ssi_int;     /* Integer sent by sigqueue(2) */
 431    uint64_t ssi_ptr;     /* Pointer sent by sigqueue(2) */
 432    uint64_t ssi_utime;   /* User CPU time consumed (SIGCHLD) */
 433    uint64_t ssi_stime;   /* System CPU time consumed (SIGCHLD) */
 434    uint64_t ssi_addr;    /* Address that generated signal
 435                             (for hardware-generated signals) */
 436    uint8_t  pad[48];     /* Pad size to 128 bytes (allow for
 437                             additional fields in the future) */
 438};
 439
 440int qemu_signalfd(const sigset_t *mask);
 441void sigaction_invoke(struct sigaction *action,
 442                      struct qemu_signalfd_siginfo *info);
 443#endif
 444
 445int qemu_madvise(void *addr, size_t len, int advice);
 446int qemu_mprotect_rwx(void *addr, size_t size);
 447int qemu_mprotect_none(void *addr, size_t size);
 448
 449int qemu_open(const char *name, int flags, ...);
 450int qemu_close(int fd);
 451int qemu_unlink(const char *name);
 452#ifndef _WIN32
 453int qemu_dup(int fd);
 454#endif
 455int qemu_lock_fd(int fd, int64_t start, int64_t len, bool exclusive);
 456int qemu_unlock_fd(int fd, int64_t start, int64_t len);
 457int qemu_lock_fd_test(int fd, int64_t start, int64_t len, bool exclusive);
 458bool qemu_has_ofd_lock(void);
 459
 460#if defined(__HAIKU__) && defined(__i386__)
 461#define FMT_pid "%ld"
 462#elif defined(WIN64)
 463#define FMT_pid "%" PRId64
 464#else
 465#define FMT_pid "%d"
 466#endif
 467
 468bool qemu_write_pidfile(const char *pidfile, Error **errp);
 469
 470int qemu_get_thread_id(void);
 471
 472#ifndef CONFIG_IOVEC
 473struct iovec {
 474    void *iov_base;
 475    size_t iov_len;
 476};
 477/*
 478 * Use the same value as Linux for now.
 479 */
 480#define IOV_MAX 1024
 481
 482ssize_t readv(int fd, const struct iovec *iov, int iov_cnt);
 483ssize_t writev(int fd, const struct iovec *iov, int iov_cnt);
 484#else
 485#include <sys/uio.h>
 486#endif
 487
 488#ifdef _WIN32
 489static inline void qemu_timersub(const struct timeval *val1,
 490                                 const struct timeval *val2,
 491                                 struct timeval *res)
 492{
 493    res->tv_sec = val1->tv_sec - val2->tv_sec;
 494    if (val1->tv_usec < val2->tv_usec) {
 495        res->tv_sec--;
 496        res->tv_usec = val1->tv_usec - val2->tv_usec + 1000 * 1000;
 497    } else {
 498        res->tv_usec = val1->tv_usec - val2->tv_usec;
 499    }
 500}
 501#else
 502#define qemu_timersub timersub
 503#endif
 504
 505void qemu_set_cloexec(int fd);
 506
 507/* Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
 508 * instead of QEMU_VERSION, so setting hw_version on MachineClass
 509 * is no longer mandatory.
 510 *
 511 * Do NOT change this string, or it will break compatibility on all
 512 * machine classes that don't set hw_version.
 513 */
 514#define QEMU_HW_VERSION "2.5+"
 515
 516/* QEMU "hardware version" setting. Used to replace code that exposed
 517 * QEMU_VERSION to guests in the past and need to keep compatibility.
 518 * Do not use qemu_hw_version() in new code.
 519 */
 520void qemu_set_hw_version(const char *);
 521const char *qemu_hw_version(void);
 522
 523void fips_set_state(bool requested);
 524bool fips_get_state(void);
 525
 526/* Return a dynamically allocated pathname denoting a file or directory that is
 527 * appropriate for storing local state.
 528 *
 529 * @relative_pathname need not start with a directory separator; one will be
 530 * added automatically.
 531 *
 532 * The caller is responsible for releasing the value returned with g_free()
 533 * after use.
 534 */
 535char *qemu_get_local_state_pathname(const char *relative_pathname);
 536
 537/* Find program directory, and save it for later usage with
 538 * qemu_get_exec_dir().
 539 * Try OS specific API first, if not working, parse from argv0. */
 540void qemu_init_exec_dir(const char *argv0);
 541
 542/* Get the saved exec dir.
 543 * Caller needs to release the returned string by g_free() */
 544char *qemu_get_exec_dir(void);
 545
 546/**
 547 * qemu_getauxval:
 548 * @type: the auxiliary vector key to lookup
 549 *
 550 * Search the auxiliary vector for @type, returning the value
 551 * or 0 if @type is not present.
 552 */
 553unsigned long qemu_getauxval(unsigned long type);
 554
 555void qemu_set_tty_echo(int fd, bool echo);
 556
 557void os_mem_prealloc(int fd, char *area, size_t sz, int smp_cpus,
 558                     Error **errp);
 559
 560/**
 561 * qemu_get_pid_name:
 562 * @pid: pid of a process
 563 *
 564 * For given @pid fetch its name. Caller is responsible for
 565 * freeing the string when no longer needed.
 566 * Returns allocated string on success, NULL on failure.
 567 */
 568char *qemu_get_pid_name(pid_t pid);
 569
 570/**
 571 * qemu_fork:
 572 *
 573 * A version of fork that avoids signal handler race
 574 * conditions that can lead to child process getting
 575 * signals that are otherwise only expected by the
 576 * parent. It also resets all signal handlers to the
 577 * default settings.
 578 *
 579 * Returns 0 to child process, pid number to parent
 580 * or -1 on failure.
 581 */
 582pid_t qemu_fork(Error **errp);
 583
 584/* Using intptr_t ensures that qemu_*_page_mask is sign-extended even
 585 * when intptr_t is 32-bit and we are aligning a long long.
 586 */
 587extern uintptr_t qemu_real_host_page_size;
 588extern intptr_t qemu_real_host_page_mask;
 589
 590extern int qemu_icache_linesize;
 591extern int qemu_icache_linesize_log;
 592extern int qemu_dcache_linesize;
 593extern int qemu_dcache_linesize_log;
 594
 595/*
 596 * After using getopt or getopt_long, if you need to parse another set
 597 * of options, then you must reset optind.  Unfortunately the way to
 598 * do this varies between implementations of getopt.
 599 */
 600static inline void qemu_reset_optind(void)
 601{
 602#ifdef HAVE_OPTRESET
 603    optind = 1;
 604    optreset = 1;
 605#else
 606    optind = 0;
 607#endif
 608}
 609
 610#endif
 611