Changeset 8e7c9fe in mainline for uspace/lib/math/generic/mod.c

Timestamp:

2014-09-12T03:45:25Z (11 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

c53b58e

Parents:

3eb0c85 (diff), 105d8d6 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

merge mainline changes

most usb changes were reverted. blink and usbmass were fixed
known problems:
ehci won't initialize
usbmast asserts on unmount (happens on mainline too)

File:

• uspace/lib/math/generic/mod.c (moved) (moved from kernel/arch/ppc32/src/ddi/ddi.c ) (3 diffs)

uspace/lib/math/generic/mod.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2006 Jakub Jermar
+ * Copyright (c) 2014 Martin Decky
  * All rights reserved.
  *
@@ -27 +27 @@
  */
 
-/** @addtogroup ppc32ddi
+/** @addtogroup libmath
  * @{
  */
@@ -33 +33 @@
  */
 
-#include <ddi/ddi.h>
-#include <proc/task.h>
-#include <typedefs.h>
+#include <math.h>
+#include <mod.h>
 
-/** Enable I/O space range for task.
+/** Double precision modulo
  *
- * Interrupts are disabled and task is locked.
+ * Calculate the modulo of dividend by divisor.
  *
- * @param task Task.
- * @param ioaddr Startign I/O space address.
- * @param size Size of the enabled I/O range.
+ * This is a very basic implementation that uses
+ * division and multiplication (instead of exact
+ * arithmetics). Thus the result might be very
+ * imprecise (depending on the magnitude of the
+ * arguments).
  *
- * @return 0 on success or an error code from errno.h.
+ * @param dividend Dividend.
+ * @param divisor  Divisor.
+ *
+ * @return Modulo.
  *
  */
-int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
+double double_mod(double dividend, double divisor)
 {
-        return 0;
+        // FIXME: replace with exact arithmetics
+        
+        double quotient = trunc(dividend / divisor);
+        
+        return (dividend - quotient * divisor);
 }