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authorJack Steiner <steiner@sgi.com>2006-02-07 09:24:14 -0800
committerTony Luck <tony.luck@intel.com>2006-02-07 09:24:14 -0800
commitdcc1dd2366a7c355fd8b6543c52685b864a2044f (patch)
treec1fa5734246518c4cd0da82ec151eb905fd1b375
parent412e6a378260608bf28f29d4fa8a9241e0240a2d (diff)
[IA64-SGI] - Eliminate SN pio_phys_xxx macros. Move to assembly
Rewrite the SN pio_phys_xxx macros in assembly language. This avoids issues with the Intel icc compiler. Function call overhead is not an issue - the functions reference PIOs and take 100's nsec to complete. In addition, the functions should likely be in assembly language anyway - they reference memory using physical addressing mode. One function executes with psr.ic disabled. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
-rw-r--r--arch/ia64/sn/kernel/Makefile3
-rw-r--r--arch/ia64/sn/kernel/pio_phys.S71
-rw-r--r--include/asm-ia64/sn/rw_mmr.h56
3 files changed, 78 insertions, 52 deletions
diff --git a/arch/ia64/sn/kernel/Makefile b/arch/ia64/sn/kernel/Makefile
index 3e9b4eea7418..ab9c48c88012 100644
--- a/arch/ia64/sn/kernel/Makefile
+++ b/arch/ia64/sn/kernel/Makefile
@@ -10,7 +10,8 @@
CPPFLAGS += -I$(srctree)/arch/ia64/sn/include
obj-y += setup.o bte.o bte_error.o irq.o mca.o idle.o \
- huberror.o io_init.o iomv.o klconflib.o sn2/
+ huberror.o io_init.o iomv.o klconflib.o pio_phys.o \
+ sn2/
obj-$(CONFIG_IA64_GENERIC) += machvec.o
obj-$(CONFIG_SGI_TIOCX) += tiocx.o
obj-$(CONFIG_IA64_SGI_SN_XP) += xp.o
diff --git a/arch/ia64/sn/kernel/pio_phys.S b/arch/ia64/sn/kernel/pio_phys.S
new file mode 100644
index 000000000000..3c7d48d6ecb8
--- /dev/null
+++ b/arch/ia64/sn/kernel/pio_phys.S
@@ -0,0 +1,71 @@
+/*
+ * 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) 2000-2005 Silicon Graphics, Inc. All rights reserved.
+ *
+ * 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 1 or 2 MMRs with psr.ic=0
+ * Second MMR will be skipped if address is NULL
+ *
+ * Addresses passed to these routines should be uncached physical addresses
+ * ie., 0x80000....
+ */
+
+
+
+#include <asm/asmmacro.h>
+#include <asm/page.h>
+
+GLOBAL_ENTRY(pio_phys_read_mmr)
+ .prologue
+ .regstk 1,0,0,0
+ .body
+ mov r2=psr
+ rsm psr.i | psr.dt
+ ;;
+ srlz.d
+ ld8.acq r8=[r32]
+ ;;
+ mov psr.l=r2;;
+ srlz.d
+ br.ret.sptk.many rp
+END(pio_phys_read_mmr)
+
+GLOBAL_ENTRY(pio_phys_write_mmr)
+ .prologue
+ .regstk 2,0,0,0
+ .body
+ mov r2=psr
+ rsm psr.i | psr.dt
+ ;;
+ srlz.d
+ st8.rel [r32]=r33
+ ;;
+ mov psr.l=r2;;
+ srlz.d
+ br.ret.sptk.many rp
+END(pio_phys_write_mmr)
+
+GLOBAL_ENTRY(pio_atomic_phys_write_mmrs)
+ .prologue
+ .regstk 4,0,0,0
+ .body
+ mov r2=psr
+ cmp.ne p9,p0=r34,r0;
+ rsm psr.i | psr.dt | psr.ic
+ ;;
+ srlz.d
+ st8.rel [r32]=r33
+(p9) st8.rel [r34]=r35
+ ;;
+ mov psr.l=r2;;
+ srlz.d
+ br.ret.sptk.many rp
+END(pio_atomic_phys_write_mmrs)
+
+
diff --git a/include/asm-ia64/sn/rw_mmr.h b/include/asm-ia64/sn/rw_mmr.h
index f40fd1a5510d..2d78f4c5a45e 100644
--- a/include/asm-ia64/sn/rw_mmr.h
+++ b/include/asm-ia64/sn/rw_mmr.h
@@ -3,15 +3,14 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (C) 2002-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (C) 2002-2006 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.
+ * This file that access MMRs 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 1 or 2 MMRs with psr.ic=0
@@ -22,53 +21,8 @@
*/
-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;;"
- "cmp.ne p9,p0=%2,r0;"
- "srlz.i;;"
- "st8.rel [%0]=%1;"
- "(p9) st8.rel [%2]=%3;;"
- "mov psr.l=r2;;"
- "srlz.i;;"
- :: "r"(mmr1), "r"(val1), "r"(mmr2), "r"(val2)
- : "p9", "r2", "memory");
-}
+extern long pio_phys_read_mmr(volatile long *mmr);
+extern void pio_phys_write_mmr(volatile long *mmr, long val);
+extern void pio_atomic_phys_write_mmrs(volatile long *mmr1, long val1, volatile long *mmr2, long val2);
#endif /* _ASM_IA64_SN_RW_MMR_H */