patch-2.4.21 linux-2.4.21/include/asm-ia64/sn/rw_mmr.h

• Lines: 74
• Date: 2003-06-13 07:51:38.000000000 -0700
• Orig file: linux-2.4.20/include/asm-ia64/sn/rw_mmr.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/include/asm-ia64/sn/rw_mmr.h linux-2.4.21/include/asm-ia64/sn/rw_mmr.h
@@ -0,0 +1,73 @@
+/*
+ * 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) 2002 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+#ifndef _ASM_IA64_SN_RW_MMR_H
+#define _ASM_IA64_SN_RW_MMR_H
+
+
+/*
+ * This file contains macros used to access MMR registers via
+ * uncached physical addresses.
+ * 	pio_phys_read_mmr  - read an MMR
+ * 	pio_phys_write_mmr - write an MMR
+ * 	pio_atomic_phys_write_mmrs - atomically write 2 MMRs with psr.ic=0
+ * 		(interrupt collection)
+ *
+ * Addresses passed to these routines should be uncached physical addresses
+ * ie., 0x80000....
+ */
+
+
+extern inline long
+pio_phys_read_mmr(volatile long *mmr) 
+{
+	long val;
+        asm volatile
+            ("mov r2=psr;;"
+             "rsm psr.i | psr.dt;;"
+             "srlz.i;;"
+             "ld8.acq %0=[%1];;"
+             "mov psr.l=r2;;"
+             "srlz.i;;"
+             : "=r"(val)
+             : "r"(mmr)
+	     : "r2");
+        return val;
+}
+
+
+
+extern inline void
+pio_phys_write_mmr(volatile long *mmr, long val) 
+{
+        asm volatile
+            ("mov r2=psr;;"
+             "rsm psr.i | psr.dt;;"
+             "srlz.i;;"
+             "st8.rel [%0]=%1;;"
+             "mov psr.l=r2;;"
+             "srlz.i;;"
+	     :: "r"(mmr), "r"(val)
+             : "r2", "memory");
+}            
+
+extern inline void
+pio_atomic_phys_write_mmrs(volatile long *mmr1, long val1, volatile long *mmr2, long val2) 
+{
+        asm volatile
+            ("mov r2=psr;;"
+             "rsm psr.i | psr.dt | psr.ic;;"
+             "srlz.i;;"
+             "st8.rel [%0]=%1;"
+             "st8.rel [%2]=%3;;"
+             "mov psr.l=r2;;"
+             "srlz.i;;"
+	     :: "r"(mmr1), "r"(val1), "r"(mmr2), "r"(val2)
+             : "r2", "memory");
+}            
+
+#endif /* _ASM_IA64_SN_RW_MMR_H */