patch-2.4.19 linux-2.4.19/include/asm-ia64/sn/sn_pio_sync.h

• Lines: 54
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-ia64/sn/sn_pio_sync.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-ia64/sn/sn_pio_sync.h linux-2.4.19/include/asm-ia64/sn/sn_pio_sync.h
@@ -0,0 +1,53 @@
+/*
+ *
+ * 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) 2001-2002 Silicon Graphics, Inc. All rights reserved.
+ */
+
+
+#ifndef _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H
+#define _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H
+
+#include <linux/config.h>
+#ifdef CONFIG_IA64_SGI_SN2
+#include <asm/sn/sn_cpuid.h>
+#include <asm/sn/sn2/addrs.h>
+#include <asm/sn/sn2/shub_mmr.h>
+#include <asm/sn/sn2/shub_mmr_t.h>
+
+/*
+ * This macro flushes all outstanding PIOs performed by this cpu to the 
+ * intended destination SHUB.  This in essence ensures that all PIO's
+ * issues by this cpu has landed at it's destination.
+ *
+ * This macro expects the caller:
+ *	1.  The thread is locked.
+ *	2.  All prior PIO operations has been fenced with __ia64_mf_a().
+ *
+ * The expectation is that get_slice() will return either 0 or 2.
+ * When we have multi-core cpu's, the expectation is get_slice() will 
+ * return either 0,1 or 2,3.
+ */
+
+#define SN_PIO_WRITE_SYNC \
+	{ \
+		volatile unsigned long sn_pio_writes_done; \
+	do { \
+		sn_pio_writes_done = (volatile unsigned long) (SH_PIO_WRITE_STATUS_0_WRITES_OK_MASK & HUB_L( (unsigned long *)GLOBAL_MMR_ADDR(get_nasid(), (get_slice() < 2) ? SH_PIO_WRITE_STATUS_0 : SH_PIO_WRITE_STATUS_1 ))); \
+	} while (!sn_pio_writes_done); \
+	__ia64_mf_a(); \
+	}
+#else
+
+/*
+ * For all ARCHITECTURE type, this is a NOOP.
+ */
+
+#define SN_PIO_WRITE_SYNC
+
+#endif
+
+#endif /* _ASM_IA64_SN_SN_PIO_WRITE_SYNC_H */