2 * QEMU low level functions
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
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32 #if defined(USE_KQEMU)
44 void *get_mmap_addr(unsigned long size)
49 void qemu_free(void *ptr)
54 void *qemu_malloc(size_t size)
61 void *qemu_vmalloc(size_t size)
63 /* FIXME: this is not exactly optimal solution since VirtualAlloc
64 has 64Kb granularity, but at least it guarantees us that the
65 memory is page aligned. */
66 return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
69 void qemu_vfree(void *ptr)
71 VirtualFree(ptr, 0, MEM_RELEASE);
76 #if defined(USE_KQEMU)
82 void *kqemu_vmalloc(size_t size)
84 static int phys_ram_fd = -1;
85 static int phys_ram_size = 0;
87 char phys_ram_file[1024];
91 if (phys_ram_fd < 0) {
92 tmpdir = getenv("QEMU_TMPDIR");
95 if (statfs(tmpdir, &stfs) == 0) {
100 free_space = (int64_t)stfs.f_bavail * stfs.f_bsize;
101 if ((ram_size + 8192 * 1024) >= free_space) {
102 ram_mb = (ram_size / (1024 * 1024));
104 "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n",
106 if (strcmp(tmpdir, "/dev/shm") == 0) {
107 fprintf(stderr, "To have more space available provided you have enough RAM and swap, do as root:\n"
109 "mount -t tmpfs -o size=%dm none /dev/shm\n",
113 "Use the '-m' option of QEMU to diminish the amount of virtual RAM or use the\n"
114 "QEMU_TMPDIR environment variable to set another directory where the QEMU\n"
115 "temporary RAM file will be opened.\n");
117 fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n");
121 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
123 phys_ram_fd = mkstemp(phys_ram_file);
124 if (phys_ram_fd < 0) {
126 "warning: could not create temporary file in '%s'.\n"
127 "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
128 "Using '/tmp' as fallback.\n",
130 snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
132 phys_ram_fd = mkstemp(phys_ram_file);
133 if (phys_ram_fd < 0) {
134 fprintf(stderr, "Could not create temporary memory file '%s'\n",
139 unlink(phys_ram_file);
141 size = (size + 4095) & ~4095;
142 ftruncate(phys_ram_fd, phys_ram_size + size);
145 PROT_WRITE | PROT_READ, MAP_SHARED,
146 phys_ram_fd, phys_ram_size);
147 if (ptr == MAP_FAILED) {
148 fprintf(stderr, "Could not map physical memory\n");
151 phys_ram_size += size;
155 void kqemu_vfree(void *ptr)
157 /* may be useful some day, but currently we do not need to free */
162 /* alloc shared memory pages */
163 void *qemu_vmalloc(size_t size)
165 #if defined(USE_KQEMU)
167 return kqemu_vmalloc(size);
172 return memalign(4096, size);
176 void qemu_vfree(void *ptr)
178 #if defined(USE_KQEMU)
187 void *qemu_mallocz(size_t size)
190 ptr = qemu_malloc(size);
193 memset(ptr, 0, size);
197 char *qemu_strdup(const char *str)
200 ptr = qemu_malloc(strlen(str) + 1);