Changeset a1b9f63 in mainline for kernel/test/mm/mapping1.c

Timestamp:

2018-08-31T10:32:40Z (6 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

6bf5b8c

Parents:

b1834a01

git-author:

Jakub Jermar <jakub@…> (2018-08-31 09:54:11)

git-committer:

Jakub Jermar <jakub@…> (2018-08-31 10:32:40)

Message:

Add alignment argument to km_map()

km_map() currently always applies alignment requirement equal to the
size of the mapped region. Most of the time, the natural alignment is
unnecessarily strong and especially on 32-bit systems may contribute to
km_map() failures for regions with size in the order of several hundred
megabytes.

This change adds an extra argument to km_map() which allows the caller
to indicate the desired alignment. The old behaviour can be specified
by passing KM_NATURAL_ALIGNMENT as alignment.

This change only adds the alignment argument, but does not change the
alignment requirement anywhere.

File:

• kernel/test/mm/mapping1.c (modified) (1 diff)

kernel/test/mm/mapping1.c

@@ -43 +43 @@
         uintptr_t frame = frame_alloc(1, FRAME_NONE, 0);
 
-        uintptr_t page0 = km_map(frame, FRAME_SIZE,
+        uintptr_t page0 = km_map(frame, FRAME_SIZE, FRAME_SIZE,
             PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
         TPRINTF("Virtual address %p mapped to physical address %p.\n",
             (void *) page0, (void *) frame);
 
-        uintptr_t page1 = km_map(frame, FRAME_SIZE,
+        uintptr_t page1 = km_map(frame, FRAME_SIZE, FRAME_SIZE,
             PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
         TPRINTF("Virtual address %p mapped to physical address %p.\n",