Changeset a1b9f63 in mainline for kernel/arch/ppc32

Timestamp:

2018-08-31T10:32:40Z (7 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.

Location:

kernel/arch/ppc32/src

Files:

• drivers/pic.c (modified) (1 diff)
• ppc32.c (modified) (1 diff)

kernel/arch/ppc32/src/drivers/pic.c

@@ -42 +42 @@
 void pic_init(uintptr_t base, size_t size, cir_t *cir, void **cir_arg)
 {
-        pic = (uint32_t *) km_map(base, size, PAGE_WRITE | PAGE_NOT_CACHEABLE);
+        pic = (uint32_t *) km_map(base, size, KM_NATURAL_ALIGNMENT,
+            PAGE_WRITE | PAGE_NOT_CACHEABLE);
         *cir = pic_ack_interrupt;
         *cir_arg = NULL;

kernel/arch/ppc32/src/ppc32.c

@@ -242 +242 @@
 
                 cuda_t *cuda = (cuda_t *) (km_map(aligned_addr, offset + size,
+                    KM_NATURAL_ALIGNMENT,
                     PAGE_WRITE | PAGE_NOT_CACHEABLE) + offset);