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ea88812f FB |
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> | |
ea88812f FB |
28 | #include <errno.h> |
29 | #include <unistd.h> | |
30 | ||
31 | #include "cpu.h" | |
6cb7ee85 PB |
32 | #if defined(USE_KQEMU) |
33 | #include "vl.h" | |
34 | #endif | |
ea88812f | 35 | |
6e4255f6 FB |
36 | #ifdef _WIN32 |
37 | #include <windows.h> | |
38 | #elif defined(_BSD) | |
194884dd FB |
39 | #include <stdlib.h> |
40 | #else | |
49b470eb | 41 | #include <malloc.h> |
194884dd | 42 | #endif |
49b470eb | 43 | |
ea88812f FB |
44 | void *get_mmap_addr(unsigned long size) |
45 | { | |
46 | return NULL; | |
47 | } | |
48 | ||
49 | void qemu_free(void *ptr) | |
50 | { | |
51 | free(ptr); | |
52 | } | |
53 | ||
54 | void *qemu_malloc(size_t size) | |
55 | { | |
56 | return malloc(size); | |
57 | } | |
58 | ||
6e4255f6 FB |
59 | #if defined(_WIN32) |
60 | ||
61 | void *qemu_vmalloc(size_t size) | |
62 | { | |
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); | |
67 | } | |
68 | ||
69 | void qemu_vfree(void *ptr) | |
70 | { | |
71 | VirtualFree(ptr, 0, MEM_RELEASE); | |
72 | } | |
73 | ||
6cb7ee85 PB |
74 | #else |
75 | ||
76 | #if defined(USE_KQEMU) | |
49b470eb | 77 | |
6bae7ed8 | 78 | #include <sys/vfs.h> |
49b470eb FB |
79 | #include <sys/mman.h> |
80 | #include <fcntl.h> | |
81 | ||
6cb7ee85 | 82 | void *kqemu_vmalloc(size_t size) |
49b470eb FB |
83 | { |
84 | static int phys_ram_fd = -1; | |
85 | static int phys_ram_size = 0; | |
86 | const char *tmpdir; | |
87 | char phys_ram_file[1024]; | |
88 | void *ptr; | |
6bae7ed8 | 89 | struct statfs stfs; |
49b470eb FB |
90 | |
91 | if (phys_ram_fd < 0) { | |
92 | tmpdir = getenv("QEMU_TMPDIR"); | |
93 | if (!tmpdir) | |
94 | tmpdir = "/dev/shm"; | |
6bae7ed8 FB |
95 | if (statfs(tmpdir, &stfs) == 0) { |
96 | int64_t free_space; | |
97 | int ram_mb; | |
98 | ||
99 | extern int ram_size; | |
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)); | |
103 | fprintf(stderr, | |
104 | "You do not have enough space in '%s' for the %d MB of QEMU virtual RAM.\n", | |
105 | tmpdir, ram_mb); | |
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" | |
108 | "umount /dev/shm\n" | |
109 | "mount -t tmpfs -o size=%dm none /dev/shm\n", | |
110 | ram_mb + 16); | |
111 | } else { | |
112 | fprintf(stderr, | |
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"); | |
116 | } | |
6cb7ee85 | 117 | fprintf(stderr, "Or disable the accelerator module with -no-kqemu\n"); |
6bae7ed8 FB |
118 | exit(1); |
119 | } | |
120 | } | |
49b470eb FB |
121 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", |
122 | tmpdir); | |
243a273e FB |
123 | phys_ram_fd = mkstemp(phys_ram_file); |
124 | if (phys_ram_fd < 0) { | |
49b470eb FB |
125 | fprintf(stderr, |
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", | |
129 | tmpdir); | |
130 | snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX", | |
131 | "/tmp"); | |
243a273e FB |
132 | phys_ram_fd = mkstemp(phys_ram_file); |
133 | if (phys_ram_fd < 0) { | |
49b470eb FB |
134 | fprintf(stderr, "Could not create temporary memory file '%s'\n", |
135 | phys_ram_file); | |
136 | exit(1); | |
137 | } | |
138 | } | |
49b470eb FB |
139 | unlink(phys_ram_file); |
140 | } | |
141 | size = (size + 4095) & ~4095; | |
142 | ftruncate(phys_ram_fd, phys_ram_size + size); | |
143 | ptr = mmap(NULL, | |
144 | 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"); | |
149 | exit(1); | |
150 | } | |
151 | phys_ram_size += size; | |
152 | return ptr; | |
153 | } | |
154 | ||
6cb7ee85 | 155 | void kqemu_vfree(void *ptr) |
49b470eb FB |
156 | { |
157 | /* may be useful some day, but currently we do not need to free */ | |
158 | } | |
159 | ||
6cb7ee85 | 160 | #endif |
49b470eb FB |
161 | |
162 | /* alloc shared memory pages */ | |
163 | void *qemu_vmalloc(size_t size) | |
164 | { | |
6cb7ee85 PB |
165 | #if defined(USE_KQEMU) |
166 | if (kqemu_allowed) | |
167 | return kqemu_vmalloc(size); | |
168 | #endif | |
49b470eb FB |
169 | #ifdef _BSD |
170 | return valloc(size); | |
171 | #else | |
172 | return memalign(4096, size); | |
173 | #endif | |
174 | } | |
175 | ||
176 | void qemu_vfree(void *ptr) | |
177 | { | |
6cb7ee85 PB |
178 | #if defined(USE_KQEMU) |
179 | if (kqemu_allowed) | |
180 | kqemu_vfree(ptr); | |
181 | #endif | |
49b470eb FB |
182 | free(ptr); |
183 | } | |
184 | ||
185 | #endif | |
186 | ||
07d89866 FB |
187 | void *qemu_mallocz(size_t size) |
188 | { | |
189 | void *ptr; | |
190 | ptr = qemu_malloc(size); | |
191 | if (!ptr) | |
192 | return NULL; | |
193 | memset(ptr, 0, size); | |
194 | return ptr; | |
195 | } | |
196 | ||
2571929a FB |
197 | char *qemu_strdup(const char *str) |
198 | { | |
199 | char *ptr; | |
200 | ptr = qemu_malloc(strlen(str) + 1); | |
201 | if (!ptr) | |
202 | return NULL; | |
203 | strcpy(ptr, str); | |
204 | return ptr; | |
205 | } |