[rtems commit] bsps/arm: Add arm_cp15_get_min_cache_line_size()
Sebastian Huber
sebh at rtems.org
Fri May 3 15:29:26 UTC 2013
Module: rtems
Branch: master
Commit: d2d0296138aced3ccc0828dc1a109b1df61f1bbb
Changeset: http://git.rtems.org/rtems/commit/?id=d2d0296138aced3ccc0828dc1a109b1df61f1bbb
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Thu May 2 17:40:45 2013 +0200
bsps/arm: Add arm_cp15_get_min_cache_line_size()
---
c/src/lib/libcpu/arm/shared/include/arm-cp15.h | 32 +++++++++++++++++++----
1 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/c/src/lib/libcpu/arm/shared/include/arm-cp15.h b/c/src/lib/libcpu/arm/shared/include/arm-cp15.h
index 017c0e3..7f7249f 100644
--- a/c/src/lib/libcpu/arm/shared/include/arm-cp15.h
+++ b/c/src/lib/libcpu/arm/shared/include/arm-cp15.h
@@ -7,12 +7,13 @@
*/
/*
- * Copyright (c) 2009, 2010
- * embedded brains GmbH
- * Obere Lagerstr. 30
- * D-82178 Puchheim
- * Germany
- * <rtems at embedded-brains.de>
+ * Copyright (c) 2009-2013 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <info at embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
@@ -443,6 +444,25 @@ static inline uint32_t arm_cp15_get_cache_type(void)
return val;
}
+static inline uint32_t arm_cp15_get_min_cache_line_size(void)
+{
+ uint32_t mcls = 0;
+ uint32_t ct = arm_cp15_get_cache_type();
+ uint32_t format = (ct >> 29) & 0x7U;
+
+ if (format == 0x4) {
+ mcls = (1U << (ct & 0xf)) * 4;
+ } else if (format == 0x0) {
+ uint32_t mask = (1U << 12) - 1;
+ uint32_t dcls = (ct >> 12) & mask;
+ uint32_t icls = ct & mask;
+
+ mcls = dcls <= icls ? dcls : icls;
+ }
+
+ return mcls;
+}
+
static inline void arm_cp15_cache_invalidate(void)
{
ARM_SWITCH_REGISTERS;
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