2009-12-01 Till Straumann <strauman@slac.stanford.edu>

	* score/cpu/powerpc/rtems/score/cpu.h: Added space for non-
	volatile AltiVec registers to context struct. Added declaration
	for AltiVec-related routines to be implemented by CPU/BSP
	support.

1 files changed, 55 insertions, 0 deletions

diff --git a/cpukit/score/cpu/powerpc/rtems/score/cpu.h b/cpukit/score/cpu/powerpc/rtems/score/cpu.h
index 2ee1c255fa..1933308fac 100644
--- a/cpukit/score/cpu/powerpc/rtems/score/cpu.h
+++ b/cpukit/score/cpu/powerpc/rtems/score/cpu.h
@@ -252,6 +252,19 @@ typedef struct {
     uint32_t   cr;	/* PART of the CR is non volatile for all */
     uint32_t   pc;	/* Program counter/Link register */
     uint32_t   msr;	/* Initial interrupt level */
+#ifdef __ALTIVEC__
+	/* 12 non-volatile vector registers, cache-aligned area for vscr/vrsave
+	 * and padding to ensure cache-alignment.
+	 * Unfortunately, we can't verify the cache line size here
+	 * in the cpukit but altivec support code will produce an
+	 * error if this is ever different from 32 bytes.
+	 * 
+	 * Note: it is the BSP/CPU-support's responsibility to
+	 *       save/restore volatile vregs across interrupts
+	 *       and exceptions.
+	 */
+	uint8_t    altivec[16*12 + 32 + 32];
+#endif
 } Context_Control;
 
 #define _CPU_Context_Get_SP( _context ) \
@@ -646,6 +659,48 @@ void _CPU_Context_restore_fp(
   Context_Control_fp **fp_context_ptr
 );
 
+/*
+ * _CPU_Initialize_altivec()
+ *
+ * Global altivec-related initialization.
+ */
+void
+_CPU_Initialize_altivec(void);
+
+/*
+ * _CPU_Context_switch_altivec
+ *
+ * This routine switches the altivec contexts passed to it.
+ */
+
+void
+_CPU_Context_switch_altivec(
+  Context_Control *from,
+  Context_Control *to
+);
+
+/*
+ * _CPU_Context_restore_altivec
+ *
+ * This routine restores the altivec context passed to it.
+ */
+
+void
+_CPU_Context_restore_altivec(
+  Context_Control *ctxt
+);
+
+/*
+ * _CPU_Context_initialize_altivec
+ *
+ * This routine initializes the altivec context passed to it.
+ */
+
+void
+_CPU_Context_initialize_altivec(
+  Context_Control *ctxt
+);
+
 void _CPU_Fatal_error(
   uint32_t   _error
 );