Changeset 2057572 in mainline for uspace/libc/generic/as.c

Timestamp:

2007-03-27T23:40:25Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

399ece9

Parents:

8d37a06

Message:

The Ultimate Solution To Illegal Virtual Aliases.
It is better to avoid them completely than to fight them.
Switch the sparc64 port to 16K pages. The TLBs and TSBs
continue to operate with 8K pages only. Page tables and
other generic parts operate with 16K pages.

Because the MMU doesn't support 16K directly, each 16K
page is emulated by a pair of 8K pages. With 16K pages,
illegal aliases cannot be created in 16K D-cache.

File:

• uspace/libc/generic/as.c (modified) (5 diffs)

uspace/libc/generic/as.c

@@ -56 +56 @@
 {
         return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address,
-                (sysarg_t) size, (sysarg_t) flags);
+            (sysarg_t) size, (sysarg_t) flags);
 }
 
@@ -70 +70 @@
 int as_area_resize(void *address, size_t size, int flags)
 {
-        return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t)
-                size, (sysarg_t) flags);
+        return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address,
+            (sysarg_t) size, (sysarg_t) flags);
 }
 
@@ -144 +144 @@
  *
  * @param sz Requested size of the allocation.
- * @param color Requested virtual color of the allocation.
  *
  * @return Pointer to the beginning 
@@ -151 +150 @@
  *       the pointer to last area
  */
-void *as_get_mappable_page(size_t sz, int color)
+void *as_get_mappable_page(size_t sz)
 {
         void *res;
@@ -167 +166 @@
         
         /*
-         * Make sure we allocate from naturally aligned address and a page of
-         * appropriate color.
+         * Make sure we allocate from naturally aligned address.
          */
         i = 0;
-        do {
-                if (!last_allocated) {
-                        last_allocated = (void *) ALIGN_UP((void *) &_heap +
-                                maxheapsize, asz);
-                } else {
-                        last_allocated = (void *) ALIGN_UP(((uintptr_t)
-                                last_allocated) + (int) (i > 0), asz);
-                }
-        } while ((asz < (1 << (PAGE_COLOR_BITS + PAGE_WIDTH))) &&
-                (PAGE_COLOR((uintptr_t) last_allocated) != color) &&
-                (++i < (1 << PAGE_COLOR_BITS)));
+        if (!last_allocated) {
+                last_allocated = (void *) ALIGN_UP((void *) &_heap +
+                    maxheapsize, asz);
+        } else {
+                last_allocated = (void *) ALIGN_UP(((uintptr_t)
+                    last_allocated) + (int) (i > 0), asz);
+        }
 
         res = last_allocated;