gwj / at91sam9263 · Commits

Commit 49b470eb96a06cbaf01fa8f16b799d9a44b3a642

Authored by bellard
1 parent c9ec1fe4

shared pages memory allocation 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1279 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 2 changed files with 84 additions and 0 deletions
... ... @@ -273,6 +273,8 @@ void *get_mmap_addr(unsigned long size)
273 273  
274 274 #else
275 275  
  276 +#include <malloc.h>
  277 +
276 278 int qemu_write(int fd, const void *buf, size_t n)
277 279 {
278 280 int ret;
... ... @@ -298,6 +300,85 @@ void *qemu_malloc(size_t size)
298 300 return malloc(size);
299 301 }
300 302  
  303 +#if defined(USE_KQEMU)
  304 +
  305 +#include <sys/mman.h>
  306 +#include <fcntl.h>
  307 +
  308 +void *qemu_vmalloc(size_t size)
  309 +{
  310 + static int phys_ram_fd = -1;
  311 + static int phys_ram_size = 0;
  312 + const char *tmpdir;
  313 + char phys_ram_file[1024];
  314 + void *ptr;
  315 +
  316 + if (phys_ram_fd < 0) {
  317 + tmpdir = getenv("QEMU_TMPDIR");
  318 + if (!tmpdir)
  319 + tmpdir = "/dev/shm";
  320 + snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
  321 + tmpdir);
  322 + if (mkstemp(phys_ram_file) < 0) {
  323 + fprintf(stderr,
  324 + "warning: could not create temporary file in '%s'.\n"
  325 + "Use QEMU_TMPDIR to select a directory in a tmpfs filesystem.\n"
  326 + "Using '/tmp' as fallback.\n",
  327 + tmpdir);
  328 + snprintf(phys_ram_file, sizeof(phys_ram_file), "%s/qemuXXXXXX",
  329 + "/tmp");
  330 + if (mkstemp(phys_ram_file) < 0) {
  331 + fprintf(stderr, "Could not create temporary memory file '%s'\n",
  332 + phys_ram_file);
  333 + exit(1);
  334 + }
  335 + }
  336 + phys_ram_fd = open(phys_ram_file, O_CREAT | O_TRUNC | O_RDWR, 0600);
  337 + if (phys_ram_fd < 0) {
  338 + fprintf(stderr, "Could not open temporary memory file '%s'\n",
  339 + phys_ram_file);
  340 + exit(1);
  341 + }
  342 + unlink(phys_ram_file);
  343 + }
  344 + size = (size + 4095) & ~4095;
  345 + ftruncate(phys_ram_fd, phys_ram_size + size);
  346 + ptr = mmap(NULL,
  347 + size,
  348 + PROT_WRITE | PROT_READ, MAP_SHARED,
  349 + phys_ram_fd, phys_ram_size);
  350 + if (ptr == MAP_FAILED) {
  351 + fprintf(stderr, "Could not map physical memory\n");
  352 + exit(1);
  353 + }
  354 + phys_ram_size += size;
  355 + return ptr;
  356 +}
  357 +
  358 +void qemu_vfree(void *ptr)
  359 +{
  360 + /* may be useful some day, but currently we do not need to free */
  361 +}
  362 +
  363 +#else
  364 +
  365 +/* alloc shared memory pages */
  366 +void *qemu_vmalloc(size_t size)
  367 +{
  368 +#ifdef _BSD
  369 + return valloc(size);
  370 +#else
  371 + return memalign(4096, size);
  372 +#endif
  373 +}
  374 +
  375 +void qemu_vfree(void *ptr)
  376 +{
  377 + free(ptr);
  378 +}
  379 +
  380 +#endif
  381 +
301 382 #endif
302 383  
303 384 void *qemu_mallocz(size_t size)
... ...
... ... @@ -12,6 +12,9 @@ void *qemu_mallocz(size_t size);
12 12 void qemu_free(void *ptr);
13 13 char *qemu_strdup(const char *str);
14 14  
  15 +void *qemu_vmalloc(size_t size);
  16 +void qemu_vfree(void *ptr);
  17 +
15 18 void *get_mmap_addr(unsigned long size);
16 19  
17 20 /* specific kludges for OS compatibility (should be moved elsewhere) */
... ...