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/typedefs.h"
  16 #include "qemu/fprintf-fn.h"
  17
  18 #if defined(__arm__) || defined(__sparc__) || defined(__mips__) || defined(__hppa__) || defined(__ia64__)
  19 #define WORDS_ALIGNED
  20 #endif
  21
  22 #define TFR(expr) do { if ((expr) != -1) break; } while (errno == EINTR)
  23
  24 #include "qemu/option.h"
  25 #include "qemu/host-utils.h"
  26
  27 /* HOST_LONG_BITS is the size of a native pointer in bits. */
  28 #if UINTPTR_MAX == UINT32_MAX
  29 # define HOST_LONG_BITS 32
  30 #elif UINTPTR_MAX == UINT64_MAX
  31 # define HOST_LONG_BITS 64
  32 #else
  33 # error Unknown pointer size
  34 #endif
  35
  36 void cpu_ticks_init(void);
  37
  38 /* icount */
  39 void configure_icount(QemuOpts *opts, Error **errp);
  40 extern int use_icount;
  41 extern int icount_align_option;
  42 /* drift information for info jit command */
  43 extern int64_t max_delay;
  44 extern int64_t max_advance;
  45 void dump_drift_info(FILE *f, fprintf_function cpu_fprintf);
  46
  47 #include "qemu/bswap.h"
  48
  49 /* FIXME: Remove NEED_CPU_H.  */
  50 #ifdef NEED_CPU_H
  51 #include "cpu.h"
  52 #endif /* !defined(NEED_CPU_H) */
  53
  54 /* main function, renamed */
  55 #if defined(CONFIG_COCOA)
  56 int qemu_main(int argc, char **argv, char **envp);
  57 #endif
  58
  59 void qemu_get_timedate(struct tm *tm, int offset);
  60 int qemu_timedate_diff(struct tm *tm);
  61
  62 /**
  63  * is_help_option:
  64  * @s: string to test
  65  *
  66  * Check whether @s is one of the standard strings which indicate
  67  * that the user is asking for a list of the valid values for a
  68  * command option like -cpu or -M. The current accepted strings
  69  * are 'help' and '?'. '?' is deprecated (it is a shell wildcard
  70  * which makes it annoying to use in a reliable way) but provided
  71  * for backwards compatibility.
  72  *
  73  * Returns: true if @s is a request for a list.
  74  */
  75 static inline bool is_help_option(const char *s)
  76 {
  77     return !strcmp(s, "?") || !strcmp(s, "help");
  78 }
  79
  80 /* util/cutils.c */
  81 /**
  82  * pstrcpy:
  83  * @buf: buffer to copy string into
  84  * @buf_size: size of @buf in bytes
  85  * @str: string to copy
  86  *
  87  * Copy @str into @buf, including the trailing NUL, but do not
  88  * write more than @buf_size bytes. The resulting buffer is
  89  * always NUL terminated (even if the source string was too long).
  90  * If @buf_size is zero or negative then no bytes are copied.
  91  *
  92  * This function is similar to strncpy(), but avoids two of that
  93  * function's problems:
  94  *  * if @str fits in the buffer, pstrcpy() does not zero-fill the
  95  *    remaining space at the end of @buf
  96  *  * if @str is too long, pstrcpy() will copy the first @buf_size-1
  97  *    bytes and then add a NUL
  98  */
  99 void pstrcpy(char *buf, int buf_size, const char *str);
 100 /**
 101  * strpadcpy:
 102  * @buf: buffer to copy string into
 103  * @buf_size: size of @buf in bytes
 104  * @str: string to copy
 105  * @pad: character to pad the remainder of @buf with
 106  *
 107  * Copy @str into @buf (but *not* its trailing NUL!), and then pad the
 108  * rest of the buffer with the @pad character. If @str is too large
 109  * for the buffer then it is truncated, so that @buf contains the
 110  * first @buf_size characters of @str, with no terminator.
 111  */
 112 void strpadcpy(char *buf, int buf_size, const char *str, char pad);
 113 /**
 114  * pstrcat:
 115  * @buf: buffer containing existing string
 116  * @buf_size: size of @buf in bytes
 117  * @s: string to concatenate to @buf
 118  *
 119  * Append a copy of @s to the string already in @buf, but do not
 120  * allow the buffer to overflow. If the existing contents of @buf
 121  * plus @str would total more than @buf_size bytes, then write
 122  * as much of @str as will fit followed by a NUL terminator.
 123  *
 124  * @buf must already contain a NUL-terminated string, or the
 125  * behaviour is undefined.
 126  *
 127  * Returns: @buf.
 128  */
 129 char *pstrcat(char *buf, int buf_size, const char *s);
 130 /**
 131  * strstart:
 132  * @str: string to test
 133  * @val: prefix string to look for
 134  * @ptr: NULL, or pointer to be written to indicate start of
 135  *       the remainder of the string
 136  *
 137  * Test whether @str starts with the prefix @val.
 138  * If it does (including the degenerate case where @str and @val
 139  * are equal) then return true. If @ptr is not NULL then a
 140  * pointer to the first character following the prefix is written
 141  * to it. If @val is not a prefix of @str then return false (and
 142  * @ptr is not written to).
 143  *
 144  * Returns: true if @str starts with prefix @val, false otherwise.
 145  */
 146 int strstart(const char *str, const char *val, const char **ptr);
 147 /**
 148  * stristart:
 149  * @str: string to test
 150  * @val: prefix string to look for
 151  * @ptr: NULL, or pointer to be written to indicate start of
 152  *       the remainder of the string
 153  *
 154  * Test whether @str starts with the case-insensitive prefix @val.
 155  * This function behaves identically to strstart(), except that the
 156  * comparison is made after calling qemu_toupper() on each pair of
 157  * characters.
 158  *
 159  * Returns: true if @str starts with case-insensitive prefix @val,
 160  *          false otherwise.
 161  */
 162 int stristart(const char *str, const char *val, const char **ptr);
 163 /**
 164  * qemu_strnlen:
 165  * @s: string
 166  * @max_len: maximum number of bytes in @s to scan
 167  *
 168  * Return the length of the string @s, like strlen(), but do not
 169  * examine more than @max_len bytes of the memory pointed to by @s.
 170  * If no NUL terminator is found within @max_len bytes, then return
 171  * @max_len instead.
 172  *
 173  * This function has the same behaviour as the POSIX strnlen()
 174  * function.
 175  *
 176  * Returns: length of @s in bytes, or @max_len, whichever is smaller.
 177  */
 178 int qemu_strnlen(const char *s, int max_len);
 179 /**
 180  * qemu_strsep:
 181  * @input: pointer to string to parse
 182  * @delim: string containing delimiter characters to search for
 183  *
 184  * Locate the first occurrence of any character in @delim within
 185  * the string referenced by @input, and replace it with a NUL.
 186  * The location of the next character after the delimiter character
 187  * is stored into @input.
 188  * If the end of the string was reached without finding a delimiter
 189  * character, then NULL is stored into @input.
 190  * If @input points to a NULL pointer on entry, return NULL.
 191  * The return value is always the original value of *@input (and
 192  * so now points to a NUL-terminated string corresponding to the
 193  * part of the input up to the first delimiter).
 194  *
 195  * This function has the same behaviour as the BSD strsep() function.
 196  *
 197  * Returns: the pointer originally in @input.
 198  */
 199 char *qemu_strsep(char **input, const char *delim);
 200 time_t mktimegm(struct tm *tm);
 201 int qemu_fdatasync(int fd);
 202 int fcntl_setfl(int fd, int flag);
 203 int qemu_parse_fd(const char *param);
 204 int qemu_strtol(const char *nptr, const char **endptr, int base,
 205                 long *result);
 206 int qemu_strtoul(const char *nptr, const char **endptr, int base,
 207                  unsigned long *result);
 208 int qemu_strtoll(const char *nptr, const char **endptr, int base,
 209                  int64_t *result);
 210 int qemu_strtoull(const char *nptr, const char **endptr, int base,
 211                   uint64_t *result);
 212
 213 int parse_uint(const char *s, unsigned long long *value, char **endptr,
 214                int base);
 215 int parse_uint_full(const char *s, unsigned long long *value, int base);
 216
 217 /*
 218  * qemu_strtosz() suffixes used to specify the default treatment of an
 219  * argument passed to qemu_strtosz() without an explicit suffix.
 220  * These should be defined using upper case characters in the range
 221  * A-Z, as qemu_strtosz() will use qemu_toupper() on the given argument
 222  * prior to comparison.
 223  */
 224 #define QEMU_STRTOSZ_DEFSUFFIX_EB 'E'
 225 #define QEMU_STRTOSZ_DEFSUFFIX_PB 'P'
 226 #define QEMU_STRTOSZ_DEFSUFFIX_TB 'T'
 227 #define QEMU_STRTOSZ_DEFSUFFIX_GB 'G'
 228 #define QEMU_STRTOSZ_DEFSUFFIX_MB 'M'
 229 #define QEMU_STRTOSZ_DEFSUFFIX_KB 'K'
 230 #define QEMU_STRTOSZ_DEFSUFFIX_B 'B'
 231 int64_t qemu_strtosz(const char *nptr, char **end);
 232 int64_t qemu_strtosz_suffix(const char *nptr, char **end,
 233                             const char default_suffix);
 234 int64_t qemu_strtosz_suffix_unit(const char *nptr, char **end,
 235                             const char default_suffix, int64_t unit);
 236 #define K_BYTE     (1ULL << 10)
 237 #define M_BYTE     (1ULL << 20)
 238 #define G_BYTE     (1ULL << 30)
 239 #define T_BYTE     (1ULL << 40)
 240 #define P_BYTE     (1ULL << 50)
 241 #define E_BYTE     (1ULL << 60)
 242
 243 /* used to print char* safely */
 244 #define STR_OR_NULL(str) ((str) ? (str) : "null")
 245
 246 /* id.c */
 247
 248 typedef enum IdSubSystems {
 249     ID_QDEV,
 250     ID_BLOCK,
 251     ID_MAX      /* last element, used as array size */
 252 } IdSubSystems;
 253
 254 char *id_generate(IdSubSystems id);
 255 bool id_wellformed(const char *id);
 256
 257 /* path.c */
 258 void init_paths(const char *prefix);
 259 const char *path(const char *pathname);
 260
 261 #define qemu_isalnum(c)         isalnum((unsigned char)(c))
 262 #define qemu_isalpha(c)         isalpha((unsigned char)(c))
 263 #define qemu_iscntrl(c)         iscntrl((unsigned char)(c))
 264 #define qemu_isdigit(c)         isdigit((unsigned char)(c))
 265 #define qemu_isgraph(c)         isgraph((unsigned char)(c))
 266 #define qemu_islower(c)         islower((unsigned char)(c))
 267 #define qemu_isprint(c)         isprint((unsigned char)(c))
 268 #define qemu_ispunct(c)         ispunct((unsigned char)(c))
 269 #define qemu_isspace(c)         isspace((unsigned char)(c))
 270 #define qemu_isupper(c)         isupper((unsigned char)(c))
 271 #define qemu_isxdigit(c)        isxdigit((unsigned char)(c))
 272 #define qemu_tolower(c)         tolower((unsigned char)(c))
 273 #define qemu_toupper(c)         toupper((unsigned char)(c))
 274 #define qemu_isascii(c)         isascii((unsigned char)(c))
 275 #define qemu_toascii(c)         toascii((unsigned char)(c))
 276
 277 void *qemu_oom_check(void *ptr);
 278
 279 ssize_t qemu_write_full(int fd, const void *buf, size_t count)
 280     QEMU_WARN_UNUSED_RESULT;
 281
 282 #ifndef _WIN32
 283 int qemu_pipe(int pipefd[2]);
 284 /* like openpty() but also makes it raw; return master fd */
 285 int qemu_openpty_raw(int *aslave, char *pty_name);
 286 #endif
 287
 288 #ifdef _WIN32
 289 /* MinGW needs type casts for the 'buf' and 'optval' arguments. */
 290 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 291     getsockopt(sockfd, level, optname, (void *)optval, optlen)
 292 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 293     setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 294 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 295 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 296     sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 297 #else
 298 #define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
 299     getsockopt(sockfd, level, optname, optval, optlen)
 300 #define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
 301     setsockopt(sockfd, level, optname, optval, optlen)
 302 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 303 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
 304     sendto(sockfd, buf, len, flags, destaddr, addrlen)
 305 #endif
 306
 307 /* Error handling.  */
 308
 309 void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 310
 311 struct ParallelIOArg {
 312     void *buffer;
 313     int count;
 314 };
 315
 316 typedef int (*DMA_transfer_handler) (void *opaque, int nchan, int pos, int size);
 317
 318 typedef uint64_t pcibus_t;
 319
 320 typedef struct PCIHostDeviceAddress {
 321     unsigned int domain;
 322     unsigned int bus;
 323     unsigned int slot;
 324     unsigned int function;
 325 } PCIHostDeviceAddress;
 326
 327 void tcg_exec_init(unsigned long tb_size);
 328 bool tcg_enabled(void);
 329
 330 void cpu_exec_init_all(void);
 331
 332 /* Unblock cpu */
 333 void qemu_cpu_kick_self(void);
 334
 335 /* work queue */
 336 struct qemu_work_item {
 337     struct qemu_work_item *next;
 338     void (*func)(void *data);
 339     void *data;
 340     int done;
 341     bool free;
 342 };
 343
 344
 345 /**
 346  * Sends a (part of) iovec down a socket, yielding when the socket is full, or
 347  * Receives data into a (part of) iovec from a socket,
 348  * yielding when there is no data in the socket.
 349  * The same interface as qemu_sendv_recvv(), with added yielding.
 350  * XXX should mark these as coroutine_fn
 351  */
 352 ssize_t qemu_co_sendv_recvv(int sockfd, struct iovec *iov, unsigned iov_cnt,
 353                             size_t offset, size_t bytes, bool do_send);
 354 #define qemu_co_recvv(sockfd, iov, iov_cnt, offset, bytes) \
 355   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, false)
 356 #define qemu_co_sendv(sockfd, iov, iov_cnt, offset, bytes) \
 357   qemu_co_sendv_recvv(sockfd, iov, iov_cnt, offset, bytes, true)
 358
 359 /**
 360  * The same as above, but with just a single buffer
 361  */
 362 ssize_t qemu_co_send_recv(int sockfd, void *buf, size_t bytes, bool do_send);
 363 #define qemu_co_recv(sockfd, buf, bytes) \
 364   qemu_co_send_recv(sockfd, buf, bytes, false)
 365 #define qemu_co_send(sockfd, buf, bytes) \
 366   qemu_co_send_recv(sockfd, buf, bytes, true)
 367
 368 typedef struct QEMUIOVector {
 369     struct iovec *iov;
 370     int niov;
 371     int nalloc;
 372     size_t size;
 373 } QEMUIOVector;
 374
 375 void qemu_iovec_init(QEMUIOVector *qiov, int alloc_hint);
 376 void qemu_iovec_init_external(QEMUIOVector *qiov, struct iovec *iov, int niov);
 377 void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len);
 378 void qemu_iovec_concat(QEMUIOVector *dst,
 379                        QEMUIOVector *src, size_t soffset, size_t sbytes);
 380 size_t qemu_iovec_concat_iov(QEMUIOVector *dst,
 381                              struct iovec *src_iov, unsigned int src_cnt,
 382                              size_t soffset, size_t sbytes);
 383 bool qemu_iovec_is_zero(QEMUIOVector *qiov);
 384 void qemu_iovec_destroy(QEMUIOVector *qiov);
 385 void qemu_iovec_reset(QEMUIOVector *qiov);
 386 size_t qemu_iovec_to_buf(QEMUIOVector *qiov, size_t offset,
 387                          void *buf, size_t bytes);
 388 size_t qemu_iovec_from_buf(QEMUIOVector *qiov, size_t offset,
 389                            const void *buf, size_t bytes);
 390 size_t qemu_iovec_memset(QEMUIOVector *qiov, size_t offset,
 391                          int fillc, size_t bytes);
 392 ssize_t qemu_iovec_compare(QEMUIOVector *a, QEMUIOVector *b);
 393 void qemu_iovec_clone(QEMUIOVector *dest, const QEMUIOVector *src, void *buf);
 394 void qemu_iovec_discard_back(QEMUIOVector *qiov, size_t bytes);
 395
 396 bool buffer_is_zero(const void *buf, size_t len);
 397
 398 void qemu_progress_init(int enabled, float min_skip);
 399 void qemu_progress_end(void);
 400 void qemu_progress_print(float delta, int max);
 401 const char *qemu_get_vm_name(void);
 402
 403 #define QEMU_FILE_TYPE_BIOS   0
 404 #define QEMU_FILE_TYPE_KEYMAP 1
 405 char *qemu_find_file(int type, const char *name);
 406
 407 /* OS specific functions */
 408 void os_setup_early_signal_handling(void);
 409 char *os_find_datadir(void);
 410 void os_parse_cmd_args(int index, const char *optarg);
 411
 412 /* Convert a byte between binary and BCD.  */
 413 static inline uint8_t to_bcd(uint8_t val)
 414 {
 415     return ((val / 10) << 4) | (val % 10);
 416 }
 417
 418 static inline uint8_t from_bcd(uint8_t val)
 419 {
 420     return ((val >> 4) * 10) + (val & 0x0f);
 421 }
 422
 423 /* Round number down to multiple */
 424 #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m))
 425
 426 /* Round number up to multiple */
 427 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 428
 429 #include "qemu/module.h"
 430
 431 /*
 432  * Implementation of ULEB128 (http://en.wikipedia.org/wiki/LEB128)
 433  * Input is limited to 14-bit numbers
 434  */
 435
 436 int uleb128_encode_small(uint8_t *out, uint32_t n);
 437 int uleb128_decode_small(const uint8_t *in, uint32_t *n);
 438
 439 /* unicode.c */
 440 int mod_utf8_codepoint(const char *s, size_t n, char **end);
 441
 442 /*
 443  * Hexdump a buffer to a file. An optional string prefix is added to every line
 444  */
 445
 446 void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size);
 447
 448 /* vector definitions */
 449 #ifdef __ALTIVEC__
 450 #include <altivec.h>
 451 /* The altivec.h header says we're allowed to undef these for
 452  * C++ compatibility.  Here we don't care about C++, but we
 453  * undef them anyway to avoid namespace pollution.
 454  */
 455 #undef vector
 456 #undef pixel
 457 #undef bool
 458 #define VECTYPE        __vector unsigned char
 459 #define SPLAT(p)       vec_splat(vec_ld(0, p), 0)
 460 #define ALL_EQ(v1, v2) vec_all_eq(v1, v2)
 461 #define VEC_OR(v1, v2) ((v1) | (v2))
 462 /* altivec.h may redefine the bool macro as vector type.
 463  * Reset it to POSIX semantics. */
 464 #define bool _Bool
 465 #elif defined __SSE2__
 466 #include <emmintrin.h>
 467 #define VECTYPE        __m128i
 468 #define SPLAT(p)       _mm_set1_epi8(*(p))
 469 #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF)
 470 #define VEC_OR(v1, v2) (_mm_or_si128(v1, v2))
 471 #else
 472 #define VECTYPE        unsigned long
 473 #define SPLAT(p)       (*(p) * (~0UL / 255))
 474 #define ALL_EQ(v1, v2) ((v1) == (v2))
 475 #define VEC_OR(v1, v2) ((v1) | (v2))
 476 #endif
 477
 478 #define BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR 8
 479 static inline bool
 480 can_use_buffer_find_nonzero_offset(const void *buf, size_t len)
 481 {
 482     return (len % (BUFFER_FIND_NONZERO_OFFSET_UNROLL_FACTOR
 483                    * sizeof(VECTYPE)) == 0
 484             && ((uintptr_t) buf) % sizeof(VECTYPE) == 0);
 485 }
 486 size_t buffer_find_nonzero_offset(const void *buf, size_t len);
 487
 488 /*
 489  * helper to parse debug environment variables
 490  */
 491 int parse_debug_env(const char *name, int max, int initial);
 492
 493 const char *qemu_ether_ntoa(const MACAddr *mac);
 494 void page_size_init(void);
 495
 496 /* returns non-zero if dump is in progress, otherwise zero is
 497  * returned. */
 498 bool dump_in_progress(void);
 499
 500 #endif