LXR qemu/include/qemu-common.h

   1
   2/* Common header file that is included by all of QEMU.
   3 *
   4 * This file is supposed to be included only by .c files. No header file should
   5 * depend on qemu-common.h, as this would easily lead to circular header
   6 * dependencies.
   7 *
   8 * If a header file uses a definition from qemu-common.h, that definition
   9 * must be moved to a separate header file, and the header that uses it
  10 * must include that header.
  11 */
  12#ifndef QEMU_COMMON_H
  13#define QEMU_COMMON_H
  14
  15#include "qemu/compiler.h"
  16#include "config-host.h"
  17#include "qemu/typedefs.h"
  18
  19#if defined(__arm__) || defined(__sparc__) || defined(__mips__) || defined(__hppa__) || defined(__ia64__)
  20#define WORDS_ALIGNED
  21#endif
  22
  23#define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
  24
  25/* we put basic includes here to avoid repeating them in device drivers */
  26#include <stdlib.h>
  27#include <stdio.h>
  28#include <stdarg.h>
  29#include <stdbool.h>
  30#include <string.h>
  31#include <strings.h>
  32#include <inttypes.h>
  33#include <limits.h>
  34#include <time.h>
  35#include <ctype.h>
  36#include <errno.h>
  37#include <unistd.h>
  38#include <fcntl.h>
  39#include <sys/stat.h>
  40#include <sys/time.h>
  41#include <assert.h>
  42#include <signal.h>
  43#include "glib-compat.h"
  44
  45#ifdef _WIN32
  46#include "sysemu/os-win32.h"
  47#endif
  48
  49#ifdef CONFIG_POSIX
  50#include "sysemu/os-posix.h"
  51#endif
  52
  53#ifndef O_LARGEFILE
  54#define O_LARGEFILE 0
  55#endif
  56#ifndef O_BINARY
  57#define O_BINARY 0
  58#endif
  59#ifndef MAP_ANONYMOUS
  60#define MAP_ANONYMOUS MAP_ANON
  61#endif
  62#ifndef ENOMEDIUM
  63#define ENOMEDIUM ENODEV
  64#endif
  65#if !defined(ENOTSUP)
  66#define ENOTSUP 4096
  67#endif
  68#if !defined(ECANCELED)
  69#define ECANCELED 4097
  70#endif
  71#if !defined(EMEDIUMTYPE)
  72#define EMEDIUMTYPE 4098
  73#endif
  74#ifndef TIME_MAX
  75#define TIME_MAX LONG_MAX
  76#endif
  77
  78/* HOST_LONG_BITS is the size of a native pointer in bits. */
  79#if UINTPTR_MAX == UINT32_MAX
  80# define HOST_LONG_BITS 32
  81#elif UINTPTR_MAX == UINT64_MAX
  82# define HOST_LONG_BITS 64
  83#else
  84# error Unknown pointer size
  85#endif
  86
  87typedef int (*fprintf_function)(FILE *f, const char *fmt, ...)
  88    GCC_FMT_ATTR(2, 3);
  89
  90#ifdef _WIN32
  91#define fsync _commit
  92#if !defined(lseek)
  93# define lseek _lseeki64
  94#endif
  95int qemu_ftruncate64(int, int64_t);
  96#if !defined(ftruncate)
  97# define ftruncate qemu_ftruncate64
  98#endif
  99
 100static inline char *realpath(const char *path, char *resolved_path)
 101{
 102    _fullpath(resolved_path, path, _MAX_PATH);
 103    return resolved_path;
 104}
 105#endif
 106
 107/* icount */
 108void configure_icount(const char *option);
 109extern int use_icount;
 110
 111#include "qemu/osdep.h"
 112#include "qemu/bswap.h"
 113
 114/* FIXME: Remove NEED_CPU_H.  */
 115#ifdef NEED_CPU_H
 116#include "cpu.h"
 117#endif /* !defined(NEED_CPU_H) */
 118
 119/* main function, renamed */
 120#if defined(CONFIG_COCOA)
 121int qemu_main(int argc, char **argv, char **envp);
 122#endif
 123
 124void qemu_get_timedate(struct tm *tm, int offset);
 125int qemu_timedate_diff(struct tm *tm);
 126
 127#if !GLIB_CHECK_VERSION(2, 20, 0)
 128/*
 129 * Glib before 2.20.0 doesn't implement g_poll, so wrap it to compile properly
 130 * on older systems.
 131 */
 132static inline gint g_poll(GPollFD *fds, guint nfds, gint timeout)
 133{
 134    GMainContext *ctx = g_main_context_default();
 135    return g_main_context_get_poll_func(ctx)(fds, nfds, timeout);
 136}
 137#endif
 138
 139/**
 140 * is_help_option:
 141 * @s: string to test
 142 *
 143 * Check whether @s is one of the standard strings which indicate
 144 * that the user is asking for a list of the valid values for a
 145 * command option like -cpu or -M. The current accepted strings
 146 * are 'help' and '?'. '?' is deprecated (it is a shell wildcard
 147 * which makes it annoying to use in a reliable way) but provided
 148 * for backwards compatibility.
 149 *
 150 * Returns: true if @s is a request for a list.
 151 */
 152static inline bool is_help_option(const char *s)
 153{
 154    return !strcmp(s, "?") || !strcmp(s, "help");
 155}
 156
 157/* cutils.c */
 158void pstrcpy(char *buf, int buf_size, const char *str);
 159void strpadcpy(char *buf, int buf_size, const char *str, char pad);
 160char *pstrcat(char *buf, int buf_size, const char *s);
 161int strstart(const char *str, const char *val, const char **ptr);
 162int stristart(const char *str, const char *val, const char **ptr);
 163int qemu_strnlen(const char *s, int max_len);
 164char *qemu_strsep(char **input, const char *delim);
 165time_t mktimegm(struct tm *tm);
 166int qemu_fls(int i);
 167int qemu_fdatasync(int fd);
 168int fcntl_setfl(int fd, int flag);
 169int qemu_parse_fd(const char *param);
 170
 171int parse_uint(const char *s, unsigned long long *value, char **endptr,
 172               int base);
 173int parse_uint_full(const char *s, unsigned long long *value, int base);
 174
 175/*
 176 * strtosz() suffixes used to specify the default treatment of an
 177 * argument passed to strtosz() without an explicit suffix.
 178 * These should be defined using upper case characters in the range
 179 * A-Z, as strtosz() will use qemu_toupper() on the given argument
 180 * prior to comparison.
 181 */
 182#define STRTOSZ_DEFSUFFIX_EB    'E'
 183#define STRTOSZ_DEFSUFFIX_PB    'P'
 184#define STRTOSZ_DEFSUFFIX_TB    'T'
 185#define STRTOSZ_DEFSUFFIX_GB    'G'
 186#define STRTOSZ_DEFSUFFIX_MB    'M'
 187#define STRTOSZ_DEFSUFFIX_KB    'K'
 188#define STRTOSZ_DEFSUFFIX_B     'B'
 189int64_t strtosz(const char *nptr, char **end);
 190int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix);
 191int64_t strtosz_suffix_unit(const char *nptr, char **end,
 192                            const char default_suffix, int64_t unit);
 193
 194/* used to print char* safely */
 195#define STR_OR_NULL(str) ((str) ? (str) : "null")
 196
 197/* path.c */
 198void init_paths(const char *prefix);
 199const char *path(const char *pathname);
 200
 201#define qemu_isalnum(c)         isalnum((unsigned char)(c))
 202#define qemu_isalpha(c)         isalpha((unsigned char)(c))
 203#define qemu_iscntrl(c)         iscntrl((unsigned char)(c))
 204#define qemu_isdigit(c)         isdigit((unsigned char)(c))
 205#define qemu_isgraph(c)         isgraph((unsigned char)(c))
 206#define qemu_islower(c)         islower((unsigned char)(c))
 207#define qemu_isprint(c)         isprint((unsigned char)(c))
 208#define qemu_ispunct(c)         ispunct((unsigned char)(c))
 209#define qemu_isspace(c)         isspace((unsigned char)(c))
 210#define qemu_isupper(c)         isupper((unsigned char)(c))
 211#define qemu_isxdigit(c)        isxdigit((unsigned char)(c))
 212#define qemu_tolower(c)         tolower((unsigned char)(c))
 213#define qemu_toupper(c)         toupper((unsigned char)(c))
 214#define qemu_isascii(c)         isascii((unsigned char)(c))
 215#define qemu_toascii(c)         toascii((unsigned char)(c))
 216
 217void *qemu_oom_check(void *ptr);
 218
 219ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 220    QEMU_WARN_UNUSED_RESULT;
 221ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags)
 222    QEMU_WARN_UNUSED_RESULT;
 223ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags)
 224    QEMU_WARN_UNUSED_RESULT;
 225
 226#ifndef _WIN32
 227int qemu_pipe(int pipefd[2]);
 228/* like openpty() but also makes it raw; return master fd */
 229int qemu_openpty_raw(int *aslave, char *pty_name);
 230#endif
 231
 232#ifdef _WIN32
 233/* MinGW needs type casts for the 'buf' and 'optval' arguments. */
 234#define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 235    getsockopt(sockfd, level, optname, (void *)optval, optlen)
 236#define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 237    setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 238#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 239#define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 240    sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 241#else
 242#define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 243    getsockopt(sockfd, level, optname, optval, optlen)
 244#define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 245    setsockopt(sockfd, level, optname, optval, optlen)
 246#define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 247#define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 248    sendto(sockfd, buf, len, flags, destaddr, addrlen)
 249#endif
 250
 251/* Error handling.  */
 252
 253void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 254
 255struct ParallelIOArg {
 256    void *buffer;
 257    int count;
 258};
 259
 260typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
 261
 262typedef uint64_t pcibus_t;
 263
 264typedef enum LostTickPolicy {
 265    LOST_TICK_DISCARD,
 266    LOST_TICK_DELAY,
 267    LOST_TICK_MERGE,
 268    LOST_TICK_SLEW,
 269    LOST_TICK_MAX
 270} LostTickPolicy;
 271
 272typedef struct PCIHostDeviceAddress {
 273    unsigned int domain;
 274    unsigned int bus;
 275    unsigned int slot;
 276    unsigned int function;
 277} PCIHostDeviceAddress;
 278
 279void tcg_exec_init(unsigned long tb_size);
 280bool tcg_enabled(void);
 281
 282void cpu_exec_init_all(void);
 283
 284/* CPU save/load.  */
 285#ifdef CPU_SAVE_VERSION
 286void cpu_save(QEMUFile *f, void *opaque);
 287int cpu_load(QEMUFile *f, void *opaque, int version_id);
 288#endif
 289
 290/* Unblock cpu */
 291void qemu_cpu_kick_self(void);
 292
 293/* work queue */
 294struct qemu_work_item {
 295    struct qemu_work_item *next;
 296    void (*func)(void *data);
 297    void *data;
 298    int done;
 299    bool free;
 300};
 301
 302
 303/**
 304 * Sends a (part of) iovec down a socket, yielding when the socket is full, or
 305 * Receives data into a (part of) iovec from a socket,
 306 * yielding when there is no data in the socket.
 307 * The same interface as qemu_sendv_recvv(), with added yielding.
 308 * XXX should mark these as coroutine_fn
 309 */
 310ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
 311                            size_t offset, size_t bytes, bool do_send);
 312#define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
 313  qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
 314#define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
 315  qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
 316
 317/**
 318 * The same as above, but with just a single buffer
 319 */
 320ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
 321#define qemu_co_recv(sockfd, buf, bytes) \
 322  qemu_co_send_recv(sockfd, buf, bytes, false)
 323#define qemu_co_send(sockfd, buf, bytes) \
 324  qemu_co_send_recv(sockfd, buf, bytes, true)
 325
 326typedef struct QEMUIOVector {
 327    struct iovec *iov;
 328    int niov;
 329    int nalloc;
 330    size_t size;
 331} QEMUIOVector;
 332
 333void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
 334void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
 335void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
 336void qemu_iovec_concat(QEMUIOVector *dst,
 337                       QEMUIOVector *src, size_t soffset, size_t sbytes);
 338void qemu_iovec_concat_iov(QEMUIOVector *dst,
 339                           struct iovec *src_iov, unsigned int src_cnt,
 340                           size_t soffset, size_t sbytes);
 341void qemu_iovec_destroy(QEMUIOVector *qiov);
 342void qemu_iovec_reset(QEMUIOVector *qiov);
 343size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
 344                         void *buf, size_t bytes);
 345size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
 346                           const void *buf, size_t bytes);
 347size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
 348                         int fillc, size_t bytes);
 349
 350bool buffer_is_zero(const void *buf, size_t len);
 351
 352void qemu_progress_init(int enabled, float min_skip);
 353void qemu_progress_end(void);
 354void qemu_progress_print(float delta, int max);
 355const char *qemu_get_vm_name(void);
 356
 357#define QEMU_FILE_TYPE_BIOS   0
 358#define QEMU_FILE_TYPE_KEYMAP 1
 359char *qemu_find_file(int type, const char *name);
 360
 361/* OS specific functions */
 362void os_setup_early_signal_handling(void);
 363char *os_find_datadir(const char *argv0);
 364void os_parse_cmd_args(int index, const char *optarg);
 365void os_pidfile_error(void);
 366
 367/* Convert a byte between binary and BCD.  */
 368static inline uint8_t to_bcd(uint8_t val)
 369{
 370    return ((val / 10) << 4) | (val % 10);
 371}
 372
 373static inline uint8_t from_bcd(uint8_t val)
 374{
 375    return ((val >> 4) * 10) + (val & 0x0f);
 376}
 377
 378/* compute with 96 bit intermediate result: (a*b)/c */
 379static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
 380{
 381    union {
 382        uint64_t ll;
 383        struct {
 384#ifdef HOST_WORDS_BIGENDIAN
 385            uint32_t high, low;
 386#else
 387            uint32_t low, high;
 388#endif
 389        } l;
 390    } u, res;
 391    uint64_t rl, rh;
 392
 393    u.ll = a;
 394    rl = (uint64_t)u.l.low * (uint64_t)b;
 395    rh = (uint64_t)u.l.high * (uint64_t)b;
 396    rh += (rl >> 32);
 397    res.l.high = rh / c;
 398    res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
 399    return res.ll;
 400}
 401
 402/* Round number down to multiple */
 403#define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 404
 405/* Round number up to multiple */
 406#define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 407
 408static inline bool is_power_of_2(uint64_t value)
 409{
 410    if (!value) {
 411        return 0;
 412    }
 413
 414    return !(value & (value - 1));
 415}
 416
 417/* round down to the nearest power of 2*/
 418int64_t pow2floor(int64_t value);
 419
 420#include "qemu/module.h"
 421
 422/*
 423 * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 424 * Input is limited to 14-bit numbers
 425 */
 426
 427int uleb128_encode_small(uint8_t *out, uint32_t n);
 428int uleb128_decode_small(const uint8_t *in, uint32_t *n);
 429
 430/* unicode.c */
 431int mod_utf8_codepoint(const char *s, size_t n, char **end);
 432
 433/*
 434 * Hexdump a buffer to a file. An optional string prefix is added to every line
 435 */
 436
 437void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size);
 438
 439/* vector definitions */
 440#ifdef __ALTIVEC__
 441#include <altivec.h>
 442/* The altivec.h header says we're allowed to undef these for
 443 * C++ compatibility.  Here we don't care about C++, but we
 444 * undef them anyway to avoid namespace pollution.
 445 */
 446#undef vector
 447#undef pixel
 448#undef bool
 449#define VECTYPE        __vector unsigned char
 450#define SPLAT(p)       vec_splat(vec_ld(0, p), 0)
 451#define ALL_EQ(v1, v2) vec_all_eq(v1, v2)
 452/* altivec.h may redefine the bool macro as vector type.
 453 * Reset it to POSIX semantics. */
 454#define bool _Bool
 455#elif defined __SSE2__
 456#include <emmintrin.h>
 457#define VECTYPE        __m128i
 458#define SPLAT(p)       _mm_set1_epi8(*(p))
 459#define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF)
 460#else
 461#define VECTYPE        unsigned long
 462#define SPLAT(p)       (*(p) * (~0UL / 255))
 463#define ALL_EQ(v1, v2) ((v1) == (v2))
 464#endif
 465
 466#define BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR 8
 467static inline bool
 468can_use_buffer_find_nonzero_offset(const void *buf, size_t len)
 469{
 470    return (len % (BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR
 471                   * sizeof(VECTYPE)) == 0
 472            && ((uintptr_t) buf) % sizeof(VECTYPE) == 0);
 473}
 474size_t buffer_find_nonzero_offset(const void *buf, size_t len);
 475
 476/*
 477 * helper to parse debug environment variables
 478 */
 479int parse_debug_env(const char *name, int max, int initial);
 480
 481#endif
 482