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add 33-bit addressing support to vm_acquire_fixed()

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This commit is contained in:
gbeauche 2006-02-26 23:45:07 +00:00
parent dbc467e316
commit 735c332ab7
1 changed files with 32 additions and 4 deletions
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36
BasiliskII/src/Unix/vm_alloc.cpp
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@ -274,8 +274,6 @@ void * vm_acquire(size_t size, int options)
if (ftruncate(fd, size) < 0)
return VM_MAP_FAILED;
the_map_flags |= MAP_SHARED;
}
#endif
@ -344,14 +342,44 @@ int vm_acquire_fixed(void * addr, size_t size, int options)
return -1;
#else
#ifdef HAVE_MMAP_VM
const int extra_map_flags = translate_map_flags(options);
int fd = zero_fd;
int the_map_flags = translate_map_flags(options) | map_flags | MAP_FIXED;
if (mmap((caddr_t)addr, size, VM_PAGE_DEFAULT, extra_map_flags | map_flags | MAP_FIXED, zero_fd, 0) == (void *)MAP_FAILED)
#ifdef USE_33BIT_ADDRESSING
const char *shm_file = NULL;
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) {
the_map_flags &= ~(MAP_PRIVATE | MAP_ANON | MAP_ANONYMOUS);
the_map_flags |= MAP_SHARED;
if ((shm_file = build_shm_filename()) == NULL)
return -1;
if ((fd = shm_open(shm_file, O_RDWR | O_CREAT | O_EXCL, 0644)) < 0)
return -1;
if (ftruncate(fd, size) < 0)
return -1;
}
#endif
if (mmap((caddr_t)addr, size, VM_PAGE_DEFAULT, the_map_flags, fd, 0) == (void *)MAP_FAILED)
return -1;
// Since I don't know the standard behavior of mmap(), zero-fill here
if (memset(addr, 0, size) != addr)
return -1;
// Remap to 33-bit space
#ifdef USE_33BIT_ADDRESSING
if (sizeof(void *) == 8 && (options & VM_MAP_33BIT)) {
if (!add_shm_range(strdup(shm_file), addr, size))
return -1;
if (mmap((char *)addr + (1L << 32), size, VM_PAGE_DEFAULT, the_map_flags, fd, 0) == (void *)MAP_FAILED)
return -1;
close(fd);
}
#endif
#else
#ifdef HAVE_WIN32_VM
// Windows cannot allocate Low Memory