* instead. See hpux-os.c for some useful restrictions on actual
* usage. */
-/* FIXME: this should be turned into a pure inline memset where it is used. */
void
os_zero(os_vm_address_t addr, os_vm_size_t length)
{
- memset(addr, 0, length);
+ os_vm_address_t block_start;
+ os_vm_size_t block_size;
+
+#ifdef DEBUG
+ fprintf(stderr,";;; os_zero: addr: 0x%08x, len: 0x%08x\n",addr,length);
+#endif
+
+ block_start = os_round_up_to_page(addr);
+
+ length -= block_start-addr;
+ block_size = os_trunc_size_to_page(length);
+
+ if (block_start > addr)
+ bzero((char *)addr, block_start-addr);
+ if (block_size < length)
+ bzero((char *)block_start+block_size, length-block_size);
+
+ if (block_size != 0) {
+ /* Now deallocate and allocate the block so that it faults in
+ * zero-filled. */
+
+ os_invalidate(block_start, block_size);
+ addr = os_validate(block_start, block_size);
+
+ if (addr == NULL || addr != block_start)
+ lose("os_zero: block moved! 0x%08x ==> 0x%08x",
+ block_start,
+ addr);
+ }
}
os_vm_address_t
old_len=os_round_up_size_to_page(old_len);
if (addr==NULL)
- return os_allocate(len);
+ return os_allocate(len);
else{
- long len_diff=len-old_len;
-
- if (len_diff<0)
- os_invalidate(addr+len,-len_diff);
- else{
- if (len_diff!=0) {
- os_vm_address_t new=os_allocate(len);
-
- if(new!=NULL){
- bcopy(addr,new,old_len);
- os_invalidate(addr,old_len);
- }
-
- addr=new;
- }
- }
- return addr;
+ long len_diff=len-old_len;
+
+ if (len_diff<0)
+ os_invalidate(addr+len,-len_diff);
+ else{
+ if (len_diff!=0) {
+ os_vm_address_t new=os_allocate(len);
+
+ if(new!=NULL){
+ bcopy(addr,new,old_len);
+ os_invalidate(addr,old_len);
+ }
+
+ addr=new;
+ }
+ }
+ return addr;
}
}