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/fprintf-fn.h"
  16
  17 #if defined(__arm__) || defined(__sparc__) || defined(__mips__) || defined(__hppa__) || defined(__ia64__)
  18 #define WORDS_ALIGNED
  19 #endif
  20
  21 #define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
  22
  23 #include "qemu/option.h"
  24 #include "qemu/host-utils.h"
  25
  26 void cpu_ticks_init(void);
  27
  28 /* icount */
  29 void configure_icount(QemuOpts *opts, Error **errp);
  30 extern int use_icount;
  31 extern int icount_align_option;
  32 /* drift information for info jit command */
  33 extern int64_t max_delay;
  34 extern int64_t max_advance;
  35 void dump_drift_info(FILE *f, fprintf_function cpu_fprintf);
  36
  37 #include "qemu/bswap.h"
  38
  39 /* FIXME: Remove NEED_CPU_H.  */
  40 #ifdef NEED_CPU_H
  41 #include "cpu.h"
  42 #endif /* !defined(NEED_CPU_H) */
  43
  44 /* main function, renamed */
  45 #if defined(CONFIG_COCOA)
  46 int qemu_main(int argc, char **argv, char **envp);
  47 #endif
  48
  49 void qemu_get_timedate(struct tm *tm, int offset);
  50 int qemu_timedate_diff(struct tm *tm);
  51
  52 /**
  53  * is_help_option:
  54  * @s: string to test
  55  *
  56  * Check whether @s is one of the standard strings which indicate
  57  * that the user is asking for a list of the valid values for a
  58  * command option like -cpu or -M. The current accepted strings
  59  * are 'help' and '?'. '?' is deprecated (it is a shell wildcard
  60  * which makes it annoying to use in a reliable way) but provided
  61  * for backwards compatibility.
  62  *
  63  * Returns: true if @s is a request for a list.
  64  */
  65 static inline bool is_help_option(const char *s)
  66 {
  67     return !strcmp(s, "?") || !strcmp(s, "help");
  68 }
  69
  70 /* util/cutils.c */
  71 /**
  72  * pstrcpy:
  73  * @buf: buffer to copy string into
  74  * @buf_size: size of @buf in bytes
  75  * @str: string to copy
  76  *
  77  * Copy @str into @buf, including the trailing NUL, but do not
  78  * write more than @buf_size bytes. The resulting buffer is
  79  * always NUL terminated (even if the source string was too long).
  80  * If @buf_size is zero or negative then no bytes are copied.
  81  *
  82  * This function is similar to strncpy(), but avoids two of that
  83  * function's problems:
  84  *  * if @str fits in the buffer, pstrcpy() does not zero-fill the
  85  *    remaining space at the end of @buf
  86  *  * if @str is too long, pstrcpy() will copy the first @buf_size-1
  87  *    bytes and then add a NUL
  88  */
  89 void pstrcpy(char *buf, int buf_size, const char *str);
  90 /**
  91  * strpadcpy:
  92  * @buf: buffer to copy string into
  93  * @buf_size: size of @buf in bytes
  94  * @str: string to copy
  95  * @pad: character to pad the remainder of @buf with
  96  *
  97  * Copy @str into @buf (but *not* its trailing NUL!), and then pad the
  98  * rest of the buffer with the @pad character. If @str is too large
  99  * for the buffer then it is truncated, so that @buf contains the
 100  * first @buf_size characters of @str, with no terminator.
 101  */
 102 void strpadcpy(char *buf, int buf_size, const char *str, char pad);
 103 /**
 104  * pstrcat:
 105  * @buf: buffer containing existing string
 106  * @buf_size: size of @buf in bytes
 107  * @s: string to concatenate to @buf
 108  *
 109  * Append a copy of @s to the string already in @buf, but do not
 110  * allow the buffer to overflow. If the existing contents of @buf
 111  * plus @str would total more than @buf_size bytes, then write
 112  * as much of @str as will fit followed by a NUL terminator.
 113  *
 114  * @buf must already contain a NUL-terminated string, or the
 115  * behaviour is undefined.
 116  *
 117  * Returns: @buf.
 118  */
 119 char *pstrcat(char *buf, int buf_size, const char *s);
 120 /**
 121  * strstart:
 122  * @str: string to test
 123  * @val: prefix string to look for
 124  * @ptr: NULL, or pointer to be written to indicate start of
 125  *       the remainder of the string
 126  *
 127  * Test whether @str starts with the prefix @val.
 128  * If it does (including the degenerate case where @str and @val
 129  * are equal) then return true. If @ptr is not NULL then a
 130  * pointer to the first character following the prefix is written
 131  * to it. If @val is not a prefix of @str then return false (and
 132  * @ptr is not written to).
 133  *
 134  * Returns: true if @str starts with prefix @val, false otherwise.
 135  */
 136 int strstart(const char *str, const char *val, const char **ptr);
 137 /**
 138  * stristart:
 139  * @str: string to test
 140  * @val: prefix string to look for
 141  * @ptr: NULL, or pointer to be written to indicate start of
 142  *       the remainder of the string
 143  *
 144  * Test whether @str starts with the case-insensitive prefix @val.
 145  * This function behaves identically to strstart(), except that the
 146  * comparison is made after calling qemu_toupper() on each pair of
 147  * characters.
 148  *
 149  * Returns: true if @str starts with case-insensitive prefix @val,
 150  *          false otherwise.
 151  */
 152 int stristart(const char *str, const char *val, const char **ptr);
 153 /**
 154  * qemu_strnlen:
 155  * @s: string
 156  * @max_len: maximum number of bytes in @s to scan
 157  *
 158  * Return the length of the string @s, like strlen(), but do not
 159  * examine more than @max_len bytes of the memory pointed to by @s.
 160  * If no NUL terminator is found within @max_len bytes, then return
 161  * @max_len instead.
 162  *
 163  * This function has the same behaviour as the POSIX strnlen()
 164  * function.
 165  *
 166  * Returns: length of @s in bytes, or @max_len, whichever is smaller.
 167  */
 168 int qemu_strnlen(const char *s, int max_len);
 169 /**
 170  * qemu_strsep:
 171  * @input: pointer to string to parse
 172  * @delim: string containing delimiter characters to search for
 173  *
 174  * Locate the first occurrence of any character in @delim within
 175  * the string referenced by @input, and replace it with a NUL.
 176  * The location of the next character after the delimiter character
 177  * is stored into @input.
 178  * If the end of the string was reached without finding a delimiter
 179  * character, then NULL is stored into @input.
 180  * If @input points to a NULL pointer on entry, return NULL.
 181  * The return value is always the original value of *@input (and
 182  * so now points to a NUL-terminated string corresponding to the
 183  * part of the input up to the first delimiter).
 184  *
 185  * This function has the same behaviour as the BSD strsep() function.
 186  *
 187  * Returns: the pointer originally in @input.
 188  */
 189 char *qemu_strsep(char **input, const char *delim);
 190 time_t mktimegm(struct tm *tm);
 191 int qemu_fdatasync(int fd);
 192 int fcntl_setfl(int fd, int flag);
 193 int qemu_parse_fd(const char *param);
 194 int qemu_strtol(const char *nptr, const char **endptr, int base,
 195                 long *result);
 196 int qemu_strtoul(const char *nptr, const char **endptr, int base,
 197                  unsigned long *result);
 198 int qemu_strtoll(const char *nptr, const char **endptr, int base,
 199                  int64_t *result);
 200 int qemu_strtoull(const char *nptr, const char **endptr, int base,
 201                   uint64_t *result);
 202
 203 int parse_uint(const char *s, unsigned long long *value, char **endptr,
 204                int base);
 205 int parse_uint_full(const char *s, unsigned long long *value, int base);
 206
 207 /*
 208  * qemu_strtosz() suffixes used to specify the default treatment of an
 209  * argument passed to qemu_strtosz() without an explicit suffix.
 210  * These should be defined using upper case characters in the range
 211  * A-Z, as qemu_strtosz() will use qemu_toupper() on the given argument
 212  * prior to comparison.
 213  */
 214 #define QEMU_STRTOSZ_DEFSUFFIX_EB 'E'
 215 #define QEMU_STRTOSZ_DEFSUFFIX_PB 'P'
 216 #define QEMU_STRTOSZ_DEFSUFFIX_TB 'T'
 217 #define QEMU_STRTOSZ_DEFSUFFIX_GB 'G'
 218 #define QEMU_STRTOSZ_DEFSUFFIX_MB 'M'
 219 #define QEMU_STRTOSZ_DEFSUFFIX_KB 'K'
 220 #define QEMU_STRTOSZ_DEFSUFFIX_B 'B'
 221 int64_t qemu_strtosz(const char *nptr, char **end);
 222 int64_t qemu_strtosz_suffix(const char *nptr, char **end,
 223                             const char default_suffix);
 224 int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
 225                             const char default_suffix, int64_t unit);
 226 #define K_BYTE     (1ULL << 10)
 227 #define M_BYTE     (1ULL << 20)
 228 #define G_BYTE     (1ULL << 30)
 229 #define T_BYTE     (1ULL << 40)
 230 #define P_BYTE     (1ULL << 50)
 231 #define E_BYTE     (1ULL << 60)
 232
 233 /* used to print char* safely */
 234 #define STR_OR_NULL(str) ((str) ? (str) : "null")
 235
 236 /* id.c */
 237
 238 typedef enum IdSubSystems {
 239     ID_QDEV,
 240     ID_BLOCK,
 241     ID_MAX      /* last element, used as array size */
 242 } IdSubSystems;
 243
 244 char *id_generate(IdSubSystems id);
 245 bool id_wellformed(const char *id);
 246
 247 /* path.c */
 248 void init_paths(const char *prefix);
 249 const char *path(const char *pathname);
 250
 251 #define qemu_isalnum(c)         isalnum((unsigned char)(c))
 252 #define qemu_isalpha(c)         isalpha((unsigned char)(c))
 253 #define qemu_iscntrl(c)         iscntrl((unsigned char)(c))
 254 #define qemu_isdigit(c)         isdigit((unsigned char)(c))
 255 #define qemu_isgraph(c)         isgraph((unsigned char)(c))
 256 #define qemu_islower(c)         islower((unsigned char)(c))
 257 #define qemu_isprint(c)         isprint((unsigned char)(c))
 258 #define qemu_ispunct(c)         ispunct((unsigned char)(c))
 259 #define qemu_isspace(c)         isspace((unsigned char)(c))
 260 #define qemu_isupper(c)         isupper((unsigned char)(c))
 261 #define qemu_isxdigit(c)        isxdigit((unsigned char)(c))
 262 #define qemu_tolower(c)         tolower((unsigned char)(c))
 263 #define qemu_toupper(c)         toupper((unsigned char)(c))
 264 #define qemu_isascii(c)         isascii((unsigned char)(c))
 265 #define qemu_toascii(c)         toascii((unsigned char)(c))
 266
 267 void *qemu_oom_check(void *ptr);
 268
 269 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 270     QEMU_WARN_UNUSED_RESULT;
 271
 272 #ifndef _WIN32
 273 int qemu_pipe(int pipefd[2]);
 274 /* like openpty() but also makes it raw; return master fd */
 275 int qemu_openpty_raw(int *aslave, char *pty_name);
 276 #endif
 277
 278 #ifdef _WIN32
 279 /* MinGW needs type casts for the 'buf' and 'optval' arguments. */
 280 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 281     getsockopt(sockfd, level, optname, (void *)optval, optlen)
 282 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 283     setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 284 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 285 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 286     sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 287 #else
 288 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 289     getsockopt(sockfd, level, optname, optval, optlen)
 290 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 291     setsockopt(sockfd, level, optname, optval, optlen)
 292 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 293 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 294     sendto(sockfd, buf, len, flags, destaddr, addrlen)
 295 #endif
 296
 297 struct ParallelIOArg {
 298     void *buffer;
 299     int count;
 300 };
 301
 302 typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
 303
 304 void tcg_exec_init(unsigned long tb_size);
 305 bool tcg_enabled(void);
 306
 307 void cpu_exec_init_all(void);
 308
 309 /* Unblock cpu */
 310 void qemu_cpu_kick_self(void);
 311
 312 /* work queue */
 313 struct qemu_work_item {
 314     struct qemu_work_item *next;
 315     void (*func)(void *data);
 316     void *data;
 317     int done;
 318     bool free;
 319 };
 320
 321
 322 /**
 323  * Sends a (part of) iovec down a socket, yielding when the socket is full, or
 324  * Receives data into a (part of) iovec from a socket,
 325  * yielding when there is no data in the socket.
 326  * The same interface as qemu_sendv_recvv(), with added yielding.
 327  * XXX should mark these as coroutine_fn
 328  */
 329 ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
 330                             size_t offset, size_t bytes, bool do_send);
 331 #define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
 332   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
 333 #define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
 334   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
 335
 336 /**
 337  * The same as above, but with just a single buffer
 338  */
 339 ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
 340 #define qemu_co_recv(sockfd, buf, bytes) \
 341   qemu_co_send_recv(sockfd, buf, bytes, false)
 342 #define qemu_co_send(sockfd, buf, bytes) \
 343   qemu_co_send_recv(sockfd, buf, bytes, true)
 344
 345 bool buffer_is_zero(const void *buf, size_t len);
 346
 347 void qemu_progress_init(int enabled, float min_skip);
 348 void qemu_progress_end(void);
 349 void qemu_progress_print(float delta, int max);
 350 const char *qemu_get_vm_name(void);
 351
 352 #define QEMU_FILE_TYPE_BIOS   0
 353 #define QEMU_FILE_TYPE_KEYMAP 1
 354 char *qemu_find_file(int type, const char *name);
 355
 356 /* OS specific functions */
 357 void os_setup_early_signal_handling(void);
 358 char *os_find_datadir(void);
 359 void os_parse_cmd_args(int index, const char *optarg);
 360
 361 /* Convert a byte between binary and BCD.  */
 362 static inline uint8_t to_bcd(uint8_t val)
 363 {
 364     return ((val / 10) << 4) | (val % 10);
 365 }
 366
 367 static inline uint8_t from_bcd(uint8_t val)
 368 {
 369     return ((val >> 4) * 10) + (val & 0x0f);
 370 }
 371
 372 /* Round number down to multiple */
 373 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 374
 375 /* Round number up to multiple */
 376 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 377
 378 #include "qemu/module.h"
 379
 380 /*
 381  * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 382  * Input is limited to 14-bit numbers
 383  */
 384
 385 int uleb128_encode_small(uint8_t *out, uint32_t n);
 386 int uleb128_decode_small(const uint8_t *in, uint32_t *n);
 387
 388 /* unicode.c */
 389 int mod_utf8_codepoint(const char *s, size_t n, char **end);
 390
 391 /*
 392  * Hexdump a buffer to a file. An optional string prefix is added to every line
 393  */
 394
 395 void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size);
 396
 397 /* vector definitions */
 398 #ifdef __ALTIVEC__
 399 #include <altivec.h>
 400 /* The altivec.h header says we're allowed to undef these for
 401  * C++ compatibility.  Here we don't care about C++, but we
 402  * undef them anyway to avoid namespace pollution.
 403  */
 404 #undef vector
 405 #undef pixel
 406 #undef bool
 407 #define VECTYPE        __vector unsigned char
 408 #define SPLAT(p)       vec_splat(vec_ld(0, p), 0)
 409 #define ALL_EQ(v1, v2) vec_all_eq(v1, v2)
 410 #define VEC_OR(v1, v2) ((v1) | (v2))
 411 /* altivec.h may redefine the bool macro as vector type.
 412  * Reset it to POSIX semantics. */
 413 #define bool _Bool
 414 #elif defined __SSE2__
 415 #include <emmintrin.h>
 416 #define VECTYPE        __m128i
 417 #define SPLAT(p)       _mm_set1_epi8(*(p))
 418 #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF)
 419 #define VEC_OR(v1, v2) (_mm_or_si128(v1, v2))
 420 #else
 421 #define VECTYPE        unsigned long
 422 #define SPLAT(p)       (*(p) * (~0UL / 255))
 423 #define ALL_EQ(v1, v2) ((v1) == (v2))
 424 #define VEC_OR(v1, v2) ((v1) | (v2))
 425 #endif
 426
 427 #define BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR 8
 428 bool can_use_buffer_find_nonzero_offset(const void *buf, size_t len);
 429 size_t buffer_find_nonzero_offset(const void *buf, size_t len);
 430
 431 /*
 432  * helper to parse debug environment variables
 433  */
 434 int parse_debug_env(const char *name, int max, int initial);
 435
 436 const char *qemu_ether_ntoa(const MACAddr *mac);
 437 void page_size_init(void);
 438
 439 /* returns non-zero if dump is in progress, otherwise zero is
 440  * returned. */
 441 bool dump_in_progress(void);
 442
 443 #endif