X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fos-common.c;h=3fdf92518ad4cb3c6721e003039da0b2b3d447b8;hb=bd455348d39bee562296741689882dcb97c46ba3;hp=842781ace248b375d22b9d155bc311dd602be611;hpb=28a6fdf5f4ef6c63e1631b27e2650d928b9ba62e;p=sbcl.git

diff --git a/src/runtime/os-common.c b/src/runtime/os-common.c
index 842781a..3fdf925 100644
--- a/src/runtime/os-common.c
+++ b/src/runtime/os-common.c
@@ -22,11 +22,38 @@
  * 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\n",
+                 block_start,
+                 addr);
+    }
 }
 
 os_vm_address_t
@@ -35,51 +62,12 @@ os_allocate(os_vm_size_t len)
     return os_validate((os_vm_address_t)NULL, len);
 }
 
-os_vm_address_t
-os_allocate_at(os_vm_address_t addr, os_vm_size_t len)
-{
-    return os_validate(addr, len);
-}
-
 void
 os_deallocate(os_vm_address_t addr, os_vm_size_t len)
 {
     os_invalidate(addr,len);
 }
 
-/* (This function once tried to grow the chunk by asking os_validate
- * whether the space was available, but that really only works under
- * Mach.) */
-os_vm_address_t
-os_reallocate(os_vm_address_t addr, os_vm_size_t old_len, os_vm_size_t len)
-{
-    addr=os_trunc_to_page(addr);
-    len=os_round_up_size_to_page(len);
-    old_len=os_round_up_size_to_page(old_len);
-
-    if (addr==NULL)
-	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;
-    }
-}
-
 int
 os_get_errno(void)
 {