linux/include/asm-ia64/sn/rw_mmr.h
Jack Steiner dcc1dd2366 [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>
2006-02-07 09:24:14 -08:00

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C

/*
* 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) 2002-2006 Silicon Graphics, Inc. All Rights Reserved.
*/
#ifndef _ASM_IA64_SN_RW_MMR_H
#define _ASM_IA64_SN_RW_MMR_H
/*
* 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
* Second MMR will be skipped if address is NULL
*
* Addresses passed to these routines should be uncached physical addresses
* ie., 0x80000....
*/
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 */