initial import of openbios--main--1.0--patch-26

git-svn-id: svn://coreboot.org/openbios/openbios-devel@1 f158a5a8-5612-0410-a976-696ce0be7e32

arch/ppc/timebase.S

@@ -0,0 +1,35 @@
+changequote([[[[[,]]]]]) [[[[[  /* shield includes from m4-expansion */
+#include "asm/asmdefs.h"
+#include "asm/processor.h"
+
+/*
+ * unsigned long long _get_ticks(void);
+ */
+GLOBL(_get_ticks):
+1:      mftbu   r3
+        mftb    r4
+        mftbu   r5
+        cmpw    0,r3,r5
+        bne     1b
+        blr
+
+/*
+ * Delay for a number of ticks
+ */
+GLOBL(_wait_ticks):
+        mflr    r8              /* save link register */
+        mr      r7, r3          /* save tick count */
+        bl      _get_ticks       /* Get start time */
+
+        /* Calculate end time */
+        addc    r7, r4, r7      /* Compute end time lower */
+        addze   r6, r3          /*     and end time upper */
+
+1:      bl      _get_ticks       /* Get current time */
+        subfc   r4, r4, r7      /* Subtract current time from end time */
+        subfe.  r3, r3, r6
+        bge     1b              /* Loop until time expired */
+
+        mtlr    r8              /* restore link register */
+        blr
+