1 files changed, 68 insertions, 0 deletions
diff --git a/kernel/arch/ia64/include/asm/sn/pda.h b/kernel/arch/ia64/include/asm/sn/pda.h
new file mode 100644
index 000000000..22ae358c8
--- /dev/null
+++ b/kernel/arch/ia64/include/asm/sn/pda.h
@@ -0,0 +1,68 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
+ */
+#ifndef _ASM_IA64_SN_PDA_H
+#define _ASM_IA64_SN_PDA_H
+
+#include <linux/cache.h>
+#include <asm/percpu.h>
+
+
+/*
+ * CPU-specific data structure.
+ *
+ * One of these structures is allocated for each cpu of a NUMA system.
+ *
+ * This structure provides a convenient way of keeping together 
+ * all SN per-cpu data structures. 
+ */
+
+typedef struct pda_s {
+
+	/*
+	 * Support for SN LEDs
+	 */
+	volatile short	*led_address;
+	u8		led_state;
+	u8		hb_state;	/* supports blinking heartbeat leds */
+	unsigned int	hb_count;
+
+	unsigned int	idle_flag;
+	
+	volatile unsigned long *bedrock_rev_id;
+	volatile unsigned long *pio_write_status_addr;
+	unsigned long pio_write_status_val;
+	volatile unsigned long *pio_shub_war_cam_addr;
+
+	unsigned long	sn_in_service_ivecs[4];
+	int		sn_lb_int_war_ticks;
+	int		sn_last_irq;
+	int		sn_first_irq;
+} pda_t;
+
+
+#define CACHE_ALIGN(x)	(((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
+
+/*
+ * PDA
+ * Per-cpu private data area for each cpu. The PDA is located immediately after
+ * the IA64 cpu_data area. A full page is allocated for the cp_data area for each
+ * cpu but only a small amout of the page is actually used. We put the SNIA PDA
+ * in the same page as the cpu_data area. Note that there is a check in the setup
+ * code to verify that we don't overflow the page.
+ *
+ * Seems like we should should cache-line align the pda so that any changes in the
+ * size of the cpu_data area don't change cache layout. Should we align to 32, 64, 128
+ * or 512 boundary. Each has merits. For now, pick 128 but should be revisited later.
+ */
+DECLARE_PER_CPU(struct pda_s, pda_percpu);
+
+#define pda		(&__ia64_per_cpu_var(pda_percpu))
+
+#define pdacpu(cpu)	(&per_cpu(pda_percpu, cpu))
+
+#endif /* _ASM_IA64_SN_PDA_H */