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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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dcc1dd2366
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>
72 lines
1.4 KiB
ArmAsm
72 lines
1.4 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
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*
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* This file contains macros used to access MMR registers via
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* uncached physical addresses.
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* pio_phys_read_mmr - read an MMR
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* pio_phys_write_mmr - write an MMR
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* pio_atomic_phys_write_mmrs - atomically write 1 or 2 MMRs with psr.ic=0
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* Second MMR will be skipped if address is NULL
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*
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* Addresses passed to these routines should be uncached physical addresses
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* ie., 0x80000....
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*/
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#include <asm/asmmacro.h>
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#include <asm/page.h>
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GLOBAL_ENTRY(pio_phys_read_mmr)
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.prologue
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.regstk 1,0,0,0
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.body
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mov r2=psr
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rsm psr.i | psr.dt
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;;
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srlz.d
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ld8.acq r8=[r32]
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;;
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mov psr.l=r2;;
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srlz.d
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br.ret.sptk.many rp
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END(pio_phys_read_mmr)
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GLOBAL_ENTRY(pio_phys_write_mmr)
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.prologue
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.regstk 2,0,0,0
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.body
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mov r2=psr
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rsm psr.i | psr.dt
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;;
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srlz.d
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st8.rel [r32]=r33
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;;
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mov psr.l=r2;;
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srlz.d
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br.ret.sptk.many rp
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END(pio_phys_write_mmr)
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GLOBAL_ENTRY(pio_atomic_phys_write_mmrs)
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.prologue
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.regstk 4,0,0,0
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.body
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mov r2=psr
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cmp.ne p9,p0=r34,r0;
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rsm psr.i | psr.dt | psr.ic
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;;
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srlz.d
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st8.rel [r32]=r33
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(p9) st8.rel [r34]=r35
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;;
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mov psr.l=r2;;
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srlz.d
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br.ret.sptk.many rp
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END(pio_atomic_phys_write_mmrs)
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