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.
17 /* Except for os_zero, these routines are only called by Lisp code.
18 * These routines may also be replaced by os-dependent versions
19 * instead. See hpux-os.c for some useful restrictions on actual
23 os_zero(os_vm_address_t addr, os_vm_size_t length)
25 os_vm_address_t block_start;
26 os_vm_size_t block_size;
29 fprintf(stderr,";;; os_zero: addr: 0x%08x, len: 0x%08x\n",addr,length);
32 block_start = os_round_up_to_page(addr);
34 length -= block_start-addr;
35 block_size = os_trunc_size_to_page(length);
37 if (block_start > addr)
38 bzero((char *)addr, block_start-addr);
39 if (block_size < length)
40 bzero((char *)block_start+block_size, length-block_size);
42 if (block_size != 0) {
43 /* Now deallocate and allocate the block so that it faults in
46 os_invalidate(block_start, block_size);
47 addr = os_validate(block_start, block_size);
49 if(addr == NULL || addr != block_start)
50 lose("os_zero: block moved! 0x%08x ==> 0x%08x",
57 os_allocate(os_vm_size_t len)
59 return os_validate((os_vm_address_t)NULL, len);
63 os_allocate_at(os_vm_address_t addr, os_vm_size_t len)
65 return os_validate(addr, len);
69 os_deallocate(os_vm_address_t addr, os_vm_size_t len)
71 os_invalidate(addr,len);
74 /* (This function once tried to grow the chunk by asking os_validate
75 * whether the space was available, but that really only works under
78 os_reallocate(os_vm_address_t addr, os_vm_size_t old_len, os_vm_size_t len)
80 addr=os_trunc_to_page(addr);
81 len=os_round_up_size_to_page(len);
82 old_len=os_round_up_size_to_page(old_len);
85 return os_allocate(len);
87 long len_diff=len-old_len;
90 os_invalidate(addr+len,-len_diff);
93 os_vm_address_t new=os_allocate(len);
96 bcopy(addr,new,old_len);
97 os_invalidate(addr,old_len);