Changeset c6e314a in mainline for kernel/arch/sparc64/src/mm/page.c

Timestamp:

2006-07-14T11:39:02Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

08a7802f

Parents:

10b890b

Message:

Change hw_map() on sparc64 to use virtual addresses that are
beyond the end of physical memory. It is beneficial in two
ways: first, physical memory is no longer being wasted by
otherwise necessary calls to frame_alloc() and, second,
virtual addresses for devices are now correctly allocated
and do not overlap with the 4M TLB-locked mapping for
kernel text and data.

File:

• kernel/arch/sparc64/src/mm/page.c (modified) (4 diffs)

kernel/arch/sparc64/src/mm/page.c

@@ -27 +27 @@
  */
 
- /** @addtogroup sparc64mm      
+/** @addtogroup sparc64mm       
  * @{
  */
@@ -37 +37 @@
 #include <genarch/mm/page_ht.h>
 #include <mm/frame.h>
+#include <arch/mm/frame.h>
 #include <bitops.h>
 #include <debug.h>
+#include <align.h>
 
 void page_arch_init(void)
@@ -73 +75 @@
         else
                 order = (fnzb32(size - 1) + 1) - FRAME_WIDTH;
+
+        /*
+         * Use virtual addresses that are beyond the limit of physical memory.
+         * Thus, the physical address space will not be wasted by holes created
+         * by frame_alloc().
+         */
+        ASSERT(last_frame);
+        uintptr_t virtaddr = ALIGN_UP(last_frame, 1<<(order + FRAME_WIDTH));
+        last_frame = ALIGN_UP(virtaddr + size, 1<<(order + FRAME_WIDTH));
         
-        uintptr_t virtaddr = (uintptr_t) frame_alloc(order, FRAME_KA);
-
         for (i = 0; i < sizemap[order].count; i++)
                 dtlb_insert_mapping(virtaddr + i*sizemap[order].increment,
@@ -84 +93 @@
 }
 
- /** @}
+/** @}
  */
-