1: /*
    2:  * QEMU low level functions
    3:  *
    4:  * Copyright (c) 2003 Fabrice Bellard
    5:  *
    6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
    7:  * of this software and associated documentation files (the "Software"), to deal
    8:  * in the Software without restriction, including without limitation the rights
    9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   10:  * copies of the Software, and to permit persons to whom the Software is
   11:  * furnished to do so, subject to the following conditions:
   12:  *
   13:  * The above copyright notice and this permission notice shall be included in
   14:  * all copies or substantial portions of the Software.
   15:  *
   16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   22:  * THE SOFTWARE.
   23:  */
   24: #include <stdlib.h>
   25: #include <stdio.h>
   26: #include <stdarg.h>
   27: #include <string.h>
   28: #include <errno.h>
   29: #include <unistd.h>
   30: #include <fcntl.h>
   31: #ifdef HOST_SOLARIS
   32: #include <sys/types.h>
   33: #include <sys/statvfs.h>
   34: #endif
   35: 
   36: #include "qemu-common.h"
   37: #include "sysemu.h"
   38: 
   39: #ifdef _WIN32
   40: #define WIN32_LEAN_AND_MEAN
   41: #include <windows.h>
   42: #elif defined(_BSD)
   43: #include <stdlib.h>
   44: #else
   45: #include <malloc.h>
   46: #endif
   47: 
   48: void *get_mmap_addr(unsigned long size)
   49: {
   50:     return NULL;
   51: }
   52: 
   53: void qemu_free(void *ptr)
   54: {
   55:     free(ptr);
   56: }
   57: 
   58: void *qemu_malloc(size_t size)
   59: {
   60:     return malloc(size);
   61: }
   62: 
   63: #if defined(_WIN32)
   64: void *qemu_memalign(size_t alignment, size_t size)
   65: {
   66:     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
   67: }
   68: 
   69: void *qemu_vmalloc(size_t size)
   70: {
   71:     /* FIXME: this is not exactly optimal solution since VirtualAlloc
   72:        has 64Kb granularity, but at least it guarantees us that the
   73:        memory is page aligned. */
   74:     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
   75: }
   76: 
   77: void qemu_vfree(void *ptr)
   78: {
   79:     VirtualFree(ptr, 0, MEM_RELEASE);
   80: }
   81: 
   82: #else
   83: 
   84: #if defined(USE_KQEMU)
   85: 
   86: #include <sys/vfs.h>
   87: #include <sys/mman.h>
   88: #include <fcntl.h>
   89: 
   90: static void *kqemu_vmalloc(size_t size)
   91: {
   92:     static int phys_ram_fd = -1;
   93:     static int phys_ram_size = 0;
   94:     const char *tmpdir;
   95:     char phys_ram_file[1024];
   96:     void *ptr;
   97: #ifdef HOST_SOLARIS
   98:     struct statvfs stfs;
   99: #else
  100:     struct statfs stfs;
  101: #endif
  102: 
  103:     if (phys_ram_fd < 0) {
  104:         tmpdir = getenv("QEMU_TMPDIR");
  105:         if (!tmpdir)
  106: #ifdef HOST_SOLARIS
  107:             tmpdir = "/tmp";
  108:         if (statvfs(tmpdir, &stfs) == 0) {
  109: #else
  110:             tmpdir = "/dev/shm";
  111:         if (statfs(tmpdir, &stfs) == 0) {
  112: #endif
  113:             int64_t free_space;
  114:             int ram_mb;
  115: 
  116:             extern int ram_size;
  117:             free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
  118:             if ((ram_size + 8192 * 1024) >= free_space) {
  119:                 ram_mb = (ram_size / (1024 * 1024));
  120:                 fprintf(stderr,
  121:                         "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
  122:                         tmpdir, ram_mb);
  123:                 if (strcmp(tmpdir, "/dev/shm") == 0) {
  124:                     fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
  125:                             "umount /dev/shm\n"
  126:                             "mount -t tmpfs -o size=%dm none /dev/shm\n",
  127:                             ram_mb + 16);
  128:                 } else {
  129:                     fprintf(stderr,
  130:                             "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
  131:                             "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
  132:                             "temporary RAM file will be opened.\n");
  133:                 }
  134:                 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
  135:                 exit(1);
  136:             }
  137:         }
  138:         snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
  139:                  tmpdir);
  140:         phys_ram_fd = mkstemp(phys_ram_file);
  141:         if (phys_ram_fd < 0) {
  142:             fprintf(stderr,
  143:                     "warning: could not create temporary file in '%s'.\n"
  144:                     "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
  145:                     "Using '/tmp' as fallback.\n",
  146:                     tmpdir);
  147:             snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
  148:                      "/tmp");
  149:             phys_ram_fd = mkstemp(phys_ram_file);
  150:             if (phys_ram_fd < 0) {
  151:                 fprintf(stderr, "Could not create temporary memory file '%s'\n",
  152:                         phys_ram_file);
  153:                 exit(1);
  154:             }
  155:         }
  156:         unlink(phys_ram_file);
  157:     }
  158:     size = (size + 4095) & ~4095;
  159:     ftruncate(phys_ram_fd, phys_ram_size + size);
  160:     ptr = mmap(NULL,
  161:                size,
  162:                PROT_WRITE | PROT_READ, MAP_SHARED,
  163:                phys_ram_fd, phys_ram_size);
  164:     if (ptr == MAP_FAILED) {
  165:         fprintf(stderr, "Could not map physical memory\n");
  166:         exit(1);
  167:     }
  168:     phys_ram_size += size;
  169:     return ptr;
  170: }
  171: 
  172: static void kqemu_vfree(void *ptr)
  173: {
  174:     /* may be useful some day, but currently we do not need to free */
  175: }
  176: 
  177: #endif
  178: 
  179: void *qemu_memalign(size_t alignment, size_t size)
  180: {
  181: #if defined(_POSIX_C_SOURCE)
  182:     int ret;
  183:     void *ptr;
  184:     ret = posix_memalign(&ptr, alignment, size);
  185:     if (ret != 0)
  186:         return NULL;
  187:     return ptr;
  188: #elif defined(_BSD)
  189:     return valloc(size);
  190: #else
  191:     return memalign(alignment, size);
  192: #endif
  193: }
  194: 
  195: /* alloc shared memory pages */
  196: void *qemu_vmalloc(size_t size)
  197: {
  198: #if defined(USE_KQEMU)
  199:     if (kqemu_allowed)
  200:         return kqemu_vmalloc(size);
  201: #endif
  202: #ifdef _BSD
  203:     return valloc(size);
  204: #else
  205:     return memalign(4096, size);
  206: #endif
  207: }
  208: 
  209: void qemu_vfree(void *ptr)
  210: {
  211: #if defined(USE_KQEMU)
  212:     if (kqemu_allowed)
  213:         kqemu_vfree(ptr);
  214: #endif
  215:     free(ptr);
  216: }
  217: 
  218: #endif
  219: 
  220: void *qemu_mallocz(size_t size)
  221: {
  222:     void *ptr;
  223:     ptr = qemu_malloc(size);
  224:     if (!ptr)
  225:         return NULL;
  226:     memset(ptr, 0, size);
  227:     return ptr;
  228: }
  229: 
  230: char *qemu_strdup(const char *str)
  231: {
  232:     char *ptr;
  233:     ptr = qemu_malloc(strlen(str) + 1);
  234:     if (!ptr)
  235:         return NULL;
  236:     strcpy(ptr, str);
  237:     return ptr;
  238: }
  239: 
  240: int qemu_create_pidfile(const char *filename)
  241: {
  242:     char buffer[128];
  243:     int len;
  244: #ifndef _WIN32
  245:     int fd;
  246: 
  247:     fd = open(filename, O_RDWR | O_CREAT, 0600);
  248:     if (fd == -1)
  249:         return -1;
  250: 
  251:     if (lockf(fd, F_TLOCK, 0) == -1)
  252:         return -1;
  253: 
  254:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
  255:     if (write(fd, buffer, len) != len)
  256:         return -1;
  257: #else
  258:     HANDLE file;
  259:     DWORD flags;
  260:     OVERLAPPED overlap;
  261:     BOOL ret;
  262: 
  263:     /* Open for writing with no sharing. */
  264:     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
  265:                       OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  266: 
  267:     if (file == INVALID_HANDLE_VALUE)
  268:       return -1;
  269: 
  270:     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
  271:     overlap.hEvent = 0;
  272:     /* Lock 1 byte. */
  273:     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
  274:     if (ret == 0)
  275:       return -1;
  276: 
  277:     /* Write PID to file. */
  278:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
  279:     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
  280:                       &overlap, NULL);
  281:     if (ret == 0)
  282:       return -1;
  283: #endif
  284:     return 0;
  285: }
  286: 
  287: #ifdef _WIN32
  288: 
  289: /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
  290: #define _W32_FT_OFFSET (116444736000000000ULL)
  291: 
  292: int qemu_gettimeofday(qemu_timeval *tp)
  293: {
  294:   union {
  295:     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
  296:     FILETIME ft;
  297:   }  _now;
  298: 
  299:   if(tp)
  300:     {
  301:       GetSystemTimeAsFileTime (&_now.ft);
  302:       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
  303:       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
  304:     }
  305:   /* Always return 0 as per Open Group Base Specifications Issue 6.
  306:      Do not set errno on error.  */
  307:   return 0;
  308: }
  309: #endif /* _WIN32 */