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/osdep.h"
  16 #include "qemu/typedefs.h"
  17 #include "qemu/fprintf-fn.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 #include "glib-compat.h"
  26 #include "qemu/option.h"
  27
  28 /* HOST_LONG_BITS is the size of a native pointer in bits. */
  29 #if UINTPTR_MAX == UINT32_MAX
  30 # define HOST_LONG_BITS 32
  31 #elif UINTPTR_MAX == UINT64_MAX
  32 # define HOST_LONG_BITS 64
  33 #else
  34 # error Unknown pointer size
  35 #endif
  36
  37 void cpu_ticks_init(void);
  38
  39 /* icount */
  40 void configure_icount(QemuOpts *opts, Error **errp);
  41 extern int use_icount;
  42 extern int icount_align_option;
  43 /* drift information for info jit command */
  44 extern int64_t max_delay;
  45 extern int64_t max_advance;
  46 void dump_drift_info(FILE *f, fprintf_function cpu_fprintf);
  47
  48 #include "qemu/bswap.h"
  49
  50 /* FIXME: Remove NEED_CPU_H.  */
  51 #ifdef NEED_CPU_H
  52 #include "cpu.h"
  53 #endif /* !defined(NEED_CPU_H) */
  54
  55 /* main function, renamed */
  56 #if defined(CONFIG_COCOA)
  57 int qemu_main(int argc, char **argv, char **envp);
  58 #endif
  59
  60 void qemu_get_timedate(struct tm *tm, int offset);
  61 int qemu_timedate_diff(struct tm *tm);
  62
  63 /**
  64  * is_help_option:
  65  * @s: string to test
  66  *
  67  * Check whether @s is one of the standard strings which indicate
  68  * that the user is asking for a list of the valid values for a
  69  * command option like -cpu or -M. The current accepted strings
  70  * are 'help' and '?'. '?' is deprecated (it is a shell wildcard
  71  * which makes it annoying to use in a reliable way) but provided
  72  * for backwards compatibility.
  73  *
  74  * Returns: true if @s is a request for a list.
  75  */
  76 static inline bool is_help_option(const char *s)
  77 {
  78     return !strcmp(s, "?") || !strcmp(s, "help");
  79 }
  80
  81 /* util/cutils.c */
  82 /**
  83  * pstrcpy:
  84  * @buf: buffer to copy string into
  85  * @buf_size: size of @buf in bytes
  86  * @str: string to copy
  87  *
  88  * Copy @str into @buf, including the trailing NUL, but do not
  89  * write more than @buf_size bytes. The resulting buffer is
  90  * always NUL terminated (even if the source string was too long).
  91  * If @buf_size is zero or negative then no bytes are copied.
  92  *
  93  * This function is similar to strncpy(), but avoids two of that
  94  * function's problems:
  95  *  * if @str fits in the buffer, pstrcpy() does not zero-fill the
  96  *    remaining space at the end of @buf
  97  *  * if @str is too long, pstrcpy() will copy the first @buf_size-1
  98  *    bytes and then add a NUL
  99  */
 100 void pstrcpy(char *buf, int buf_size, const char *str);
 101 /**
 102  * strpadcpy:
 103  * @buf: buffer to copy string into
 104  * @buf_size: size of @buf in bytes
 105  * @str: string to copy
 106  * @pad: character to pad the remainder of @buf with
 107  *
 108  * Copy @str into @buf (but *not* its trailing NUL!), and then pad the
 109  * rest of the buffer with the @pad character. If @str is too large
 110  * for the buffer then it is truncated, so that @buf contains the
 111  * first @buf_size characters of @str, with no terminator.
 112  */
 113 void strpadcpy(char *buf, int buf_size, const char *str, char pad);
 114 /**
 115  * pstrcat:
 116  * @buf: buffer containing existing string
 117  * @buf_size: size of @buf in bytes
 118  * @s: string to concatenate to @buf
 119  *
 120  * Append a copy of @s to the string already in @buf, but do not
 121  * allow the buffer to overflow. If the existing contents of @buf
 122  * plus @str would total more than @buf_size bytes, then write
 123  * as much of @str as will fit followed by a NUL terminator.
 124  *
 125  * @buf must already contain a NUL-terminated string, or the
 126  * behaviour is undefined.
 127  *
 128  * Returns: @buf.
 129  */
 130 char *pstrcat(char *buf, int buf_size, const char *s);
 131 /**
 132  * strstart:
 133  * @str: string to test
 134  * @val: prefix string to look for
 135  * @ptr: NULL, or pointer to be written to indicate start of
 136  *       the remainder of the string
 137  *
 138  * Test whether @str starts with the prefix @val.
 139  * If it does (including the degenerate case where @str and @val
 140  * are equal) then return true. If @ptr is not NULL then a
 141  * pointer to the first character following the prefix is written
 142  * to it. If @val is not a prefix of @str then return false (and
 143  * @ptr is not written to).
 144  *
 145  * Returns: true if @str starts with prefix @val, false otherwise.
 146  */
 147 int strstart(const char *str, const char *val, const char **ptr);
 148 /**
 149  * stristart:
 150  * @str: string to test
 151  * @val: prefix string to look for
 152  * @ptr: NULL, or pointer to be written to indicate start of
 153  *       the remainder of the string
 154  *
 155  * Test whether @str starts with the case-insensitive prefix @val.
 156  * This function behaves identically to strstart(), except that the
 157  * comparison is made after calling qemu_toupper() on each pair of
 158  * characters.
 159  *
 160  * Returns: true if @str starts with case-insensitive prefix @val,
 161  *          false otherwise.
 162  */
 163 int stristart(const char *str, const char *val, const char **ptr);
 164 /**
 165  * qemu_strnlen:
 166  * @s: string
 167  * @max_len: maximum number of bytes in @s to scan
 168  *
 169  * Return the length of the string @s, like strlen(), but do not
 170  * examine more than @max_len bytes of the memory pointed to by @s.
 171  * If no NUL terminator is found within @max_len bytes, then return
 172  * @max_len instead.
 173  *
 174  * This function has the same behaviour as the POSIX strnlen()
 175  * function.
 176  *
 177  * Returns: length of @s in bytes, or @max_len, whichever is smaller.
 178  */
 179 int qemu_strnlen(const char *s, int max_len);
 180 /**
 181  * qemu_strsep:
 182  * @input: pointer to string to parse
 183  * @delim: string containing delimiter characters to search for
 184  *
 185  * Locate the first occurrence of any character in @delim within
 186  * the string referenced by @input, and replace it with a NUL.
 187  * The location of the next character after the delimiter character
 188  * is stored into @input.
 189  * If the end of the string was reached without finding a delimiter
 190  * character, then NULL is stored into @input.
 191  * If @input points to a NULL pointer on entry, return NULL.
 192  * The return value is always the original value of *@input (and
 193  * so now points to a NUL-terminated string corresponding to the
 194  * part of the input up to the first delimiter).
 195  *
 196  * This function has the same behaviour as the BSD strsep() function.
 197  *
 198  * Returns: the pointer originally in @input.
 199  */
 200 char *qemu_strsep(char **input, const char *delim);
 201 time_t mktimegm(struct tm *tm);
 202 int qemu_fls(int i);
 203 int qemu_fdatasync(int fd);
 204 int fcntl_setfl(int fd, int flag);
 205 int qemu_parse_fd(const char *param);
 206
 207 int parse_uint(const char *s, unsigned long long *value, char **endptr,
 208                int base);
 209 int parse_uint_full(const char *s, unsigned long long *value, int base);
 210
 211 /*
 212  * strtosz() suffixes used to specify the default treatment of an
 213  * argument passed to strtosz() without an explicit suffix.
 214  * These should be defined using upper case characters in the range
 215  * A-Z, as strtosz() will use qemu_toupper() on the given argument
 216  * prior to comparison.
 217  */
 218 #define STRTOSZ_DEFSUFFIX_EB    'E'
 219 #define STRTOSZ_DEFSUFFIX_PB    'P'
 220 #define STRTOSZ_DEFSUFFIX_TB    'T'
 221 #define STRTOSZ_DEFSUFFIX_GB    'G'
 222 #define STRTOSZ_DEFSUFFIX_MB    'M'
 223 #define STRTOSZ_DEFSUFFIX_KB    'K'
 224 #define STRTOSZ_DEFSUFFIX_B     'B'
 225 int64_t strtosz(const char *nptr, char **end);
 226 int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix);
 227 int64_t strtosz_suffix_unit(const char *nptr, char **end,
 228                             const char default_suffix, int64_t unit);
 229 #define K_BYTE     (1ULL << 10)
 230 #define M_BYTE     (1ULL << 20)
 231 #define G_BYTE     (1ULL << 30)
 232 #define T_BYTE     (1ULL << 40)
 233 #define P_BYTE     (1ULL << 50)
 234 #define E_BYTE     (1ULL << 60)
 235
 236 /* used to print char* safely */
 237 #define STR_OR_NULL(str) ((str) ? (str) : "null")
 238
 239 /* id.c */
 240 bool id_wellformed(const char *id);
 241
 242 /* path.c */
 243 void init_paths(const char *prefix);
 244 const char *path(const char *pathname);
 245
 246 #define qemu_isalnum(c)         isalnum((unsigned char)(c))
 247 #define qemu_isalpha(c)         isalpha((unsigned char)(c))
 248 #define qemu_iscntrl(c)         iscntrl((unsigned char)(c))
 249 #define qemu_isdigit(c)         isdigit((unsigned char)(c))
 250 #define qemu_isgraph(c)         isgraph((unsigned char)(c))
 251 #define qemu_islower(c)         islower((unsigned char)(c))
 252 #define qemu_isprint(c)         isprint((unsigned char)(c))
 253 #define qemu_ispunct(c)         ispunct((unsigned char)(c))
 254 #define qemu_isspace(c)         isspace((unsigned char)(c))
 255 #define qemu_isupper(c)         isupper((unsigned char)(c))
 256 #define qemu_isxdigit(c)        isxdigit((unsigned char)(c))
 257 #define qemu_tolower(c)         tolower((unsigned char)(c))
 258 #define qemu_toupper(c)         toupper((unsigned char)(c))
 259 #define qemu_isascii(c)         isascii((unsigned char)(c))
 260 #define qemu_toascii(c)         toascii((unsigned char)(c))
 261
 262 void *qemu_oom_check(void *ptr);
 263
 264 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 265     QEMU_WARN_UNUSED_RESULT;
 266
 267 #ifndef _WIN32
 268 int qemu_pipe(int pipefd[2]);
 269 /* like openpty() but also makes it raw; return master fd */
 270 int qemu_openpty_raw(int *aslave, char *pty_name);
 271 #endif
 272
 273 #ifdef _WIN32
 274 /* MinGW needs type casts for the 'buf' and 'optval' arguments. */
 275 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 276     getsockopt(sockfd, level, optname, (void *)optval, optlen)
 277 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 278     setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 279 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 280 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 281     sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 282 #else
 283 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 284     getsockopt(sockfd, level, optname, optval, optlen)
 285 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 286     setsockopt(sockfd, level, optname, optval, optlen)
 287 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 288 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 289     sendto(sockfd, buf, len, flags, destaddr, addrlen)
 290 #endif
 291
 292 /* Error handling.  */
 293
 294 void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 295
 296 struct ParallelIOArg {
 297     void *buffer;
 298     int count;
 299 };
 300
 301 typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
 302
 303 typedef uint64_t pcibus_t;
 304
 305 typedef struct PCIHostDeviceAddress {
 306     unsigned int domain;
 307     unsigned int bus;
 308     unsigned int slot;
 309     unsigned int function;
 310 } PCIHostDeviceAddress;
 311
 312 void tcg_exec_init(unsigned long tb_size);
 313 bool tcg_enabled(void);
 314
 315 void cpu_exec_init_all(void);
 316
 317 /* CPU save/load.  */
 318 #ifdef CPU_SAVE_VERSION
 319 void cpu_save(QEMUFile *f, void *opaque);
 320 int cpu_load(QEMUFile *f, void *opaque, int version_id);
 321 #endif
 322
 323 /* Unblock cpu */
 324 void qemu_cpu_kick_self(void);
 325
 326 /* work queue */
 327 struct qemu_work_item {
 328     struct qemu_work_item *next;
 329     void (*func)(void *data);
 330     void *data;
 331     int done;
 332     bool free;
 333 };
 334
 335
 336 /**
 337  * Sends a (part of) iovec down a socket, yielding when the socket is full, or
 338  * Receives data into a (part of) iovec from a socket,
 339  * yielding when there is no data in the socket.
 340  * The same interface as qemu_sendv_recvv(), with added yielding.
 341  * XXX should mark these as coroutine_fn
 342  */
 343 ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
 344                             size_t offset, size_t bytes, bool do_send);
 345 #define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
 346   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
 347 #define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
 348   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
 349
 350 /**
 351  * The same as above, but with just a single buffer
 352  */
 353 ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
 354 #define qemu_co_recv(sockfd, buf, bytes) \
 355   qemu_co_send_recv(sockfd, buf, bytes, false)
 356 #define qemu_co_send(sockfd, buf, bytes) \
 357   qemu_co_send_recv(sockfd, buf, bytes, true)
 358
 359 typedef struct QEMUIOVector {
 360     struct iovec *iov;
 361     int niov;
 362     int nalloc;
 363     size_t size;
 364 } QEMUIOVector;
 365
 366 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
 367 void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
 368 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
 369 void qemu_iovec_concat(QEMUIOVector *dst,
 370                        QEMUIOVector *src, size_t soffset, size_t sbytes);
 371 size_t qemu_iovec_concat_iov(QEMUIOVector *dst,
 372                              struct iovec *src_iov, unsigned int src_cnt,
 373                              size_t soffset, size_t sbytes);
 374 bool qemu_iovec_is_zero(QEMUIOVector *qiov);
 375 void qemu_iovec_destroy(QEMUIOVector *qiov);
 376 void qemu_iovec_reset(QEMUIOVector *qiov);
 377 size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
 378                          void *buf, size_t bytes);
 379 size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
 380                            const void *buf, size_t bytes);
 381 size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
 382                          int fillc, size_t bytes);
 383 ssize_t qemu_iovec_compare(QEMUIOVector *a, QEMUIOVector *b);
 384 void qemu_iovec_clone(QEMUIOVector *dest, const QEMUIOVector *src, void *buf);
 385 void qemu_iovec_discard_back(QEMUIOVector *qiov, size_t bytes);
 386
 387 bool buffer_is_zero(const void *buf, size_t len);
 388
 389 void qemu_progress_init(int enabled, float min_skip);
 390 void qemu_progress_end(void);
 391 void qemu_progress_print(float delta, int max);
 392 const char *qemu_get_vm_name(void);
 393
 394 #define QEMU_FILE_TYPE_BIOS   0
 395 #define QEMU_FILE_TYPE_KEYMAP 1
 396 char *qemu_find_file(int type, const char *name);
 397
 398 /* OS specific functions */
 399 void os_setup_early_signal_handling(void);
 400 char *os_find_datadir(void);
 401 void os_parse_cmd_args(int index, const char *optarg);
 402
 403 /* Convert a byte between binary and BCD.  */
 404 static inline uint8_t to_bcd(uint8_t val)
 405 {
 406     return ((val / 10) << 4) | (val % 10);
 407 }
 408
 409 static inline uint8_t from_bcd(uint8_t val)
 410 {
 411     return ((val >> 4) * 10) + (val & 0x0f);
 412 }
 413
 414 /* Round number down to multiple */
 415 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 416
 417 /* Round number up to multiple */
 418 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 419
 420 static inline bool is_power_of_2(uint64_t value)
 421 {
 422     if (!value) {
 423         return 0;
 424     }
 425
 426     return !(value & (value - 1));
 427 }
 428
 429 /* round down to the nearest power of 2*/
 430 int64_t pow2floor(int64_t value);
 431
 432 /* round up to the nearest power of 2 (0 if overflow) */
 433 uint64_t pow2ceil(uint64_t value);
 434
 435 #include "qemu/module.h"
 436
 437 /*
 438  * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 439  * Input is limited to 14-bit numbers
 440  */
 441
 442 int uleb128_encode_small(uint8_t *out, uint32_t n);
 443 int uleb128_decode_small(const uint8_t *in, uint32_t *n);
 444
 445 /* unicode.c */
 446 int mod_utf8_codepoint(const char *s, size_t n, char **end);
 447
 448 /*
 449  * Hexdump a buffer to a file. An optional string prefix is added to every line
 450  */
 451
 452 void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size);
 453
 454 /* vector definitions */
 455 #ifdef __ALTIVEC__
 456 #include <altivec.h>
 457 /* The altivec.h header says we're allowed to undef these for
 458  * C++ compatibility.  Here we don't care about C++, but we
 459  * undef them anyway to avoid namespace pollution.
 460  */
 461 #undef vector
 462 #undef pixel
 463 #undef bool
 464 #define VECTYPE        __vector unsigned char
 465 #define SPLAT(p)       vec_splat(vec_ld(0, p), 0)
 466 #define ALL_EQ(v1, v2) vec_all_eq(v1, v2)
 467 #define VEC_OR(v1, v2) ((v1) | (v2))
 468 /* altivec.h may redefine the bool macro as vector type.
 469  * Reset it to POSIX semantics. */
 470 #define bool _Bool
 471 #elif defined __SSE2__
 472 #include <emmintrin.h>
 473 #define VECTYPE        __m128i
 474 #define SPLAT(p)       _mm_set1_epi8(*(p))
 475 #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF)
 476 #define VEC_OR(v1, v2) (_mm_or_si128(v1, v2))
 477 #else
 478 #define VECTYPE        unsigned long
 479 #define SPLAT(p)       (*(p) * (~0UL / 255))
 480 #define ALL_EQ(v1, v2) ((v1) == (v2))
 481 #define VEC_OR(v1, v2) ((v1) | (v2))
 482 #endif
 483
 484 #define BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR 8
 485 static inline bool
 486 can_use_buffer_find_nonzero_offset(const void *buf, size_t len)
 487 {
 488     return (len % (BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR
 489                    * sizeof(VECTYPE)) == 0
 490             && ((uintptr_t) buf) % sizeof(VECTYPE) == 0);
 491 }
 492 size_t buffer_find_nonzero_offset(const void *buf, size_t len);
 493
 494 /*
 495  * helper to parse debug environment variables
 496  */
 497 int parse_debug_env(const char *name, int max, int initial);
 498
 499 const char *qemu_ether_ntoa(const MACAddr *mac);
 500
 501 #endif