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 "compiler.h"
  16 #include "config-host.h"
  17 #include "qemu-types.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.h>
  44
  45 #ifdef _WIN32
  46 #include "qemu-os-win32.h"
  47 #endif
  48
  49 #ifdef CONFIG_POSIX
  50 #include "qemu-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 #ifndef TIME_MAX
  72 #define TIME_MAX LONG_MAX
  73 #endif
  74
  75 /* HOST_LONG_BITS is the size of a native pointer in bits. */
  76 #if UINTPTR_MAX == UINT32_MAX
  77 # define HOST_LONG_BITS 32
  78 #elif UINTPTR_MAX == UINT64_MAX
  79 # define HOST_LONG_BITS 64
  80 #else
  81 # error Unknown pointer size
  82 #endif
  83
  84 #ifndef CONFIG_IOVEC
  85 #define CONFIG_IOVEC
  86 struct iovec {
  87     void *iov_base;
  88     size_t iov_len;
  89 };
  90 /*
  91  * Use the same value as Linux for now.
  92  */
  93 #define IOV_MAX         1024
  94 #else
  95 #include <sys/uio.h>
  96 #endif
  97
  98 typedef int (*fprintf_function)(FILE *f, const char *fmt, ...)
  99     GCC_FMT_ATTR(2, 3);
 100
 101 #ifdef _WIN32
 102 #define fsync _commit
 103 #if !defined(lseek)
 104 # define lseek _lseeki64
 105 #endif
 106 int qemu_ftruncate64(int, int64_t);
 107 #if !defined(ftruncate)
 108 # define ftruncate qemu_ftruncate64
 109 #endif
 110
 111 static inline char *realpath(const char *path, char *resolved_path)
 112 {
 113     _fullpath(resolved_path, path, _MAX_PATH);
 114     return resolved_path;
 115 }
 116 #endif
 117
 118 /* icount */
 119 void configure_icount(const char *option);
 120 extern int use_icount;
 121
 122 /* FIXME: Remove NEED_CPU_H.  */
 123 #ifndef NEED_CPU_H
 124
 125 #include "osdep.h"
 126 #include "bswap.h"
 127
 128 #else
 129
 130 #include "cpu.h"
 131
 132 #endif /* !defined(NEED_CPU_H) */
 133
 134 /* main function, renamed */
 135 #if defined(CONFIG_COCOA)
 136 int qemu_main(int argc, char **argv, char **envp);
 137 #endif
 138
 139 void qemu_get_timedate(struct tm *tm, int offset);
 140 int qemu_timedate_diff(struct tm *tm);
 141
 142 /**
 143  * is_help_option:
 144  * @s: string to test
 145  *
 146  * Check whether @s is one of the standard strings which indicate
 147  * that the user is asking for a list of the valid values for a
 148  * command option like -cpu or -M. The current accepted strings
 149  * are 'help' and '?'. '?' is deprecated (it is a shell wildcard
 150  * which makes it annoying to use in a reliable way) but provided
 151  * for backwards compatibility.
 152  *
 153  * Returns: true if @s is a request for a list.
 154  */
 155 static inline bool is_help_option(const char *s)
 156 {
 157     return !strcmp(s, "?") || !strcmp(s, "help");
 158 }
 159
 160 /* cutils.c */
 161 void pstrcpy(char *buf, int buf_size, const char *str);
 162 void strpadcpy(char *buf, int buf_size, const char *str, char pad);
 163 char *pstrcat(char *buf, int buf_size, const char *s);
 164 int strstart(const char *str, const char *val, const char **ptr);
 165 int stristart(const char *str, const char *val, const char **ptr);
 166 int qemu_strnlen(const char *s, int max_len);
 167 time_t mktimegm(struct tm *tm);
 168 int qemu_fls(int i);
 169 int qemu_fdatasync(int fd);
 170 int fcntl_setfl(int fd, int flag);
 171 int qemu_parse_fd(const char *param);
 172
 173 /*
 174  * strtosz() suffixes used to specify the default treatment of an
 175  * argument passed to strtosz() without an explicit suffix.
 176  * These should be defined using upper case characters in the range
 177  * A-Z, as strtosz() will use qemu_toupper() on the given argument
 178  * prior to comparison.
 179  */
 180 #define STRTOSZ_DEFSUFFIX_TB    'T'
 181 #define STRTOSZ_DEFSUFFIX_GB    'G'
 182 #define STRTOSZ_DEFSUFFIX_MB    'M'
 183 #define STRTOSZ_DEFSUFFIX_KB    'K'
 184 #define STRTOSZ_DEFSUFFIX_B     'B'
 185 int64_t strtosz(const char *nptr, char **end);
 186 int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix);
 187 int64_t strtosz_suffix_unit(const char *nptr, char **end,
 188                             const char default_suffix, int64_t unit);
 189
 190 /* path.c */
 191 void init_paths(const char *prefix);
 192 const char *path(const char *pathname);
 193
 194 #define qemu_isalnum(c)         isalnum((unsigned char)(c))
 195 #define qemu_isalpha(c)         isalpha((unsigned char)(c))
 196 #define qemu_iscntrl(c)         iscntrl((unsigned char)(c))
 197 #define qemu_isdigit(c)         isdigit((unsigned char)(c))
 198 #define qemu_isgraph(c)         isgraph((unsigned char)(c))
 199 #define qemu_islower(c)         islower((unsigned char)(c))
 200 #define qemu_isprint(c)         isprint((unsigned char)(c))
 201 #define qemu_ispunct(c)         ispunct((unsigned char)(c))
 202 #define qemu_isspace(c)         isspace((unsigned char)(c))
 203 #define qemu_isupper(c)         isupper((unsigned char)(c))
 204 #define qemu_isxdigit(c)        isxdigit((unsigned char)(c))
 205 #define qemu_tolower(c)         tolower((unsigned char)(c))
 206 #define qemu_toupper(c)         toupper((unsigned char)(c))
 207 #define qemu_isascii(c)         isascii((unsigned char)(c))
 208 #define qemu_toascii(c)         toascii((unsigned char)(c))
 209
 210 void *qemu_oom_check(void *ptr);
 211
 212 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 213     QEMU_WARN_UNUSED_RESULT;
 214 ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags)
 215     QEMU_WARN_UNUSED_RESULT;
 216 ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags)
 217     QEMU_WARN_UNUSED_RESULT;
 218
 219 #ifndef _WIN32
 220 int qemu_pipe(int pipefd[2]);
 221 #endif
 222
 223 #ifdef _WIN32
 224 /* MinGW needs type casts for the 'buf' and 'optval' arguments. */
 225 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 226     getsockopt(sockfd, level, optname, (void *)optval, optlen)
 227 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 228     setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 229 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 230 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 231     sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 232 #else
 233 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 234     getsockopt(sockfd, level, optname, optval, optlen)
 235 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 236     setsockopt(sockfd, level, optname, optval, optlen)
 237 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 238 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 239     sendto(sockfd, buf, len, flags, destaddr, addrlen)
 240 #endif
 241
 242 /* Error handling.  */
 243
 244 void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 245
 246 struct ParallelIOArg {
 247     void *buffer;
 248     int count;
 249 };
 250
 251 typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
 252
 253 typedef uint64_t pcibus_t;
 254
 255 typedef enum LostTickPolicy {
 256     LOST_TICK_DISCARD,
 257     LOST_TICK_DELAY,
 258     LOST_TICK_MERGE,
 259     LOST_TICK_SLEW,
 260     LOST_TICK_MAX
 261 } LostTickPolicy;
 262
 263 typedef struct PCIHostDeviceAddress {
 264     unsigned int domain;
 265     unsigned int bus;
 266     unsigned int slot;
 267     unsigned int function;
 268 } PCIHostDeviceAddress;
 269
 270 void tcg_exec_init(unsigned long tb_size);
 271 bool tcg_enabled(void);
 272
 273 void cpu_exec_init_all(void);
 274
 275 /* CPU save/load.  */
 276 void cpu_save(QEMUFile *f, void *opaque);
 277 int cpu_load(QEMUFile *f, void *opaque, int version_id);
 278
 279 /* Unblock cpu */
 280 void qemu_cpu_kick_self(void);
 281
 282 /* work queue */
 283 struct qemu_work_item {
 284     struct qemu_work_item *next;
 285     void (*func)(void *data);
 286     void *data;
 287     int done;
 288 };
 289
 290 #ifdef CONFIG_USER_ONLY
 291 #define qemu_init_vcpu(env) do { } while (0)
 292 #else
 293 void qemu_init_vcpu(void *env);
 294 #endif
 295
 296
 297 /**
 298  * Sends a (part of) iovec down a socket, yielding when the socket is full, or
 299  * Receives data into a (part of) iovec from a socket,
 300  * yielding when there is no data in the socket.
 301  * The same interface as qemu_sendv_recvv(), with added yielding.
 302  * XXX should mark these as coroutine_fn
 303  */
 304 ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
 305                             size_t offset, size_t bytes, bool do_send);
 306 #define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
 307   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
 308 #define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
 309   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
 310
 311 /**
 312  * The same as above, but with just a single buffer
 313  */
 314 ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
 315 #define qemu_co_recv(sockfd, buf, bytes) \
 316   qemu_co_send_recv(sockfd, buf, bytes, false)
 317 #define qemu_co_send(sockfd, buf, bytes) \
 318   qemu_co_send_recv(sockfd, buf, bytes, true)
 319
 320 typedef struct QEMUIOVector {
 321     struct iovec *iov;
 322     int niov;
 323     int nalloc;
 324     size_t size;
 325 } QEMUIOVector;
 326
 327 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
 328 void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
 329 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
 330 void qemu_iovec_concat(QEMUIOVector *dst,
 331                        QEMUIOVector *src, size_t soffset, size_t sbytes);
 332 void qemu_iovec_destroy(QEMUIOVector *qiov);
 333 void qemu_iovec_reset(QEMUIOVector *qiov);
 334 size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
 335                          void *buf, size_t bytes);
 336 size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
 337                            const void *buf, size_t bytes);
 338 size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
 339                          int fillc, size_t bytes);
 340
 341 bool buffer_is_zero(const void *buf, size_t len);
 342
 343 void qemu_progress_init(int enabled, float min_skip);
 344 void qemu_progress_end(void);
 345 void qemu_progress_print(float delta, int max);
 346 const char *qemu_get_vm_name(void);
 347
 348 #define QEMU_FILE_TYPE_BIOS   0
 349 #define QEMU_FILE_TYPE_KEYMAP 1
 350 char *qemu_find_file(int type, const char *name);
 351
 352 /* OS specific functions */
 353 void os_setup_early_signal_handling(void);
 354 char *os_find_datadir(const char *argv0);
 355 void os_parse_cmd_args(int index, const char *optarg);
 356 void os_pidfile_error(void);
 357
 358 /* Convert a byte between binary and BCD.  */
 359 static inline uint8_t to_bcd(uint8_t val)
 360 {
 361     return ((val / 10) << 4) | (val % 10);
 362 }
 363
 364 static inline uint8_t from_bcd(uint8_t val)
 365 {
 366     return ((val >> 4) * 10) + (val & 0x0f);
 367 }
 368
 369 /* compute with 96 bit intermediate result: (a*b)/c */
 370 static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
 371 {
 372     union {
 373         uint64_t ll;
 374         struct {
 375 #ifdef HOST_WORDS_BIGENDIAN
 376             uint32_t high, low;
 377 #else
 378             uint32_t low, high;
 379 #endif
 380         } l;
 381     } u, res;
 382     uint64_t rl, rh;
 383
 384     u.ll = a;
 385     rl = (uint64_t)u.l.low * (uint64_t)b;
 386     rh = (uint64_t)u.l.high * (uint64_t)b;
 387     rh += (rl >> 32);
 388     res.l.high = rh / c;
 389     res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c;
 390     return res.ll;
 391 }
 392
 393 /* Round number down to multiple */
 394 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 395
 396 /* Round number up to multiple */
 397 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 398
 399 static inline bool is_power_of_2(uint64_t value)
 400 {
 401     if (!value) {
 402         return 0;
 403     }
 404
 405     return !(value & (value - 1));
 406 }
 407
 408 /* round down to the nearest power of 2*/
 409 int64_t pow2floor(int64_t value);
 410
 411 #include "module.h"
 412
 413 /*
 414  * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 415  * Input is limited to 14-bit numbers
 416  */
 417
 418 int uleb128_encode_small(uint8_t *out, uint32_t n);
 419 int uleb128_decode_small(const uint8_t *in, uint32_t *n);
 420
 421 #endif