2 * This software is part of the SBCL system. See the README file for
5 * This software is derived from the CMU CL system, which was
6 * written at Carnegie Mellon University and released into the
7 * public domain. The software is in the public domain and is
8 * provided with absolutely no warranty. See the COPYING and CREDITS
9 * files for more information.
21 /* Except for os_zero, these routines are only called by Lisp code.
22 * These routines may also be replaced by os-dependent versions
23 * instead. See hpux-os.c for some useful restrictions on actual
27 os_zero(os_vm_address_t addr, os_vm_size_t length)
29 os_vm_address_t block_start;
30 os_vm_size_t block_size;
33 fprintf(stderr,";;; os_zero: addr: 0x%08x, len: 0x%08x\n",addr,length);
36 block_start = os_round_up_to_page(addr);
38 length -= block_start-addr;
39 block_size = os_trunc_size_to_page(length);
41 if (block_start > addr)
42 bzero((char *)addr, block_start-addr);
43 if (block_size < length)
44 bzero((char *)block_start+block_size, length-block_size);
46 if (block_size != 0) {
47 /* Now deallocate and allocate the block so that it faults in
50 os_invalidate(block_start, block_size);
51 addr = os_validate(block_start, block_size);
53 if(addr == NULL || addr != block_start)
54 lose("os_zero: block moved! 0x%08x ==> 0x%08x",
61 os_allocate(os_vm_size_t len)
63 return os_validate((os_vm_address_t)NULL, len);
67 os_allocate_at(os_vm_address_t addr, os_vm_size_t len)
69 return os_validate(addr, len);
73 os_deallocate(os_vm_address_t addr, os_vm_size_t len)
75 os_invalidate(addr,len);
78 /* (This function once tried to grow the chunk by asking os_validate
79 * whether the space was available, but that really only works under
82 os_reallocate(os_vm_address_t addr, os_vm_size_t old_len, os_vm_size_t len)
84 addr=os_trunc_to_page(addr);
85 len=os_round_up_size_to_page(len);
86 old_len=os_round_up_size_to_page(old_len);
89 return os_allocate(len);
91 long len_diff=len-old_len;
94 os_invalidate(addr+len,-len_diff);
97 os_vm_address_t new=os_allocate(len);
100 bcopy(addr,new,old_len);
101 os_invalidate(addr,old_len);