Changeset a1b9f63 in mainline for kernel/generic/include/mm/km.h

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/generic/include/mm/km.h (modified) (2 diffs)

kernel/generic/include/mm/km.h

@@ -39 +39 @@
 #include <mm/frame.h>
 
+#define KM_NATURAL_ALIGNMENT    -1U
+
 extern void km_identity_init(void);
 extern void km_non_identity_init(void);
@@ -49 +51 @@
 extern bool km_is_non_identity(uintptr_t);
 
-extern uintptr_t km_map(uintptr_t, size_t, unsigned int);
+extern uintptr_t km_map(uintptr_t, size_t, size_t, unsigned int);
 extern void km_unmap(uintptr_t, size_t);