c226f2601f
If mfc0 $12 follows store and the mfc0 is last instruction of a
page and fetching the next instruction causes TLB miss, the result
of the mfc0 might wrongly contain EXL bit.
ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
Workaround: mask EXL bit of the result or place a nop before mfc0. It
doesn't harm to always clear those bits, so we change the code to do so.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
177 lines
4 KiB
C
177 lines
4 KiB
C
/*
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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) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
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* Copyright (C) 1996 by Paul M. Antoine
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* Copyright (C) 1999 Silicon Graphics
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* Copyright (C) 2000 MIPS Technologies, Inc.
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*/
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#ifndef _ASM_INTERRUPT_H
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#define _ASM_INTERRUPT_H
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#include <linux/config.h>
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#include <asm/hazards.h>
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__asm__ (
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" .macro local_irq_enable \n"
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" .set push \n"
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" .set reorder \n"
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" .set noat \n"
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#ifdef CONFIG_CPU_MIPSR2
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" ei \n"
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#else
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" mfc0 $1,$12 \n"
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" ori $1,0x1f \n"
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" xori $1,0x1e \n"
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" mtc0 $1,$12 \n"
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#endif
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" irq_enable_hazard \n"
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" .set pop \n"
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" .endm");
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static inline void local_irq_enable(void)
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{
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__asm__ __volatile__(
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"local_irq_enable"
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: /* no outputs */
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: /* no inputs */
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: "memory");
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}
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/*
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* For cli() we have to insert nops to make sure that the new value
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* has actually arrived in the status register before the end of this
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* macro.
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* R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
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* no nops at all.
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*/
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/*
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* For TX49, operating only IE bit is not enough.
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*
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* If mfc0 $12 follows store and the mfc0 is last instruction of a
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* page and fetching the next instruction causes TLB miss, the result
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* of the mfc0 might wrongly contain EXL bit.
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*
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* ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
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*
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* Workaround: mask EXL bit of the result or place a nop before mfc0.
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*/
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__asm__ (
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" .macro local_irq_disable\n"
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" .set push \n"
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" .set noat \n"
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#ifdef CONFIG_CPU_MIPSR2
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" di \n"
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#else
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" mfc0 $1,$12 \n"
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" ori $1,0x1f \n"
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" xori $1,0x1f \n"
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" .set noreorder \n"
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" mtc0 $1,$12 \n"
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#endif
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" irq_disable_hazard \n"
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" .set pop \n"
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" .endm \n");
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static inline void local_irq_disable(void)
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{
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__asm__ __volatile__(
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"local_irq_disable"
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: /* no outputs */
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: /* no inputs */
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: "memory");
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}
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__asm__ (
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" .macro local_save_flags flags \n"
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" .set push \n"
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" .set reorder \n"
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" mfc0 \\flags, $12 \n"
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" .set pop \n"
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" .endm \n");
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#define local_save_flags(x) \
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__asm__ __volatile__( \
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"local_save_flags %0" \
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: "=r" (x))
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__asm__ (
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" .macro local_irq_save result \n"
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" .set push \n"
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" .set reorder \n"
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" .set noat \n"
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#ifdef CONFIG_CPU_MIPSR2
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" di \\result \n"
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" andi \\result, 1 \n"
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#else
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" mfc0 \\result, $12 \n"
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" ori $1, \\result, 0x1f \n"
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" xori $1, 0x1f \n"
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" .set noreorder \n"
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" mtc0 $1, $12 \n"
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#endif
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" irq_disable_hazard \n"
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" .set pop \n"
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" .endm \n");
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#define local_irq_save(x) \
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__asm__ __volatile__( \
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"local_irq_save\t%0" \
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: "=r" (x) \
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: /* no inputs */ \
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: "memory")
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__asm__ (
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" .macro local_irq_restore flags \n"
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" .set push \n"
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" .set noreorder \n"
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" .set noat \n"
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#if defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
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/*
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* Slow, but doesn't suffer from a relativly unlikely race
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* condition we're having since days 1.
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*/
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" beqz \\flags, 1f \n"
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" di \n"
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" ei \n"
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"1: \n"
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#elif defined(CONFIG_CPU_MIPSR2)
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/*
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* Fast, dangerous. Life is fun, life is good.
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*/
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" mfc0 $1, $12 \n"
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" ins $1, \\flags, 0, 1 \n"
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" mtc0 $1, $12 \n"
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#else
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" mfc0 $1, $12 \n"
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" andi \\flags, 1 \n"
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" ori $1, 0x1f \n"
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" xori $1, 0x1f \n"
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" or \\flags, $1 \n"
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" mtc0 \\flags, $12 \n"
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#endif
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" irq_disable_hazard \n"
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" .set pop \n"
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" .endm \n");
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#define local_irq_restore(flags) \
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do { \
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unsigned long __tmp1; \
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\
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__asm__ __volatile__( \
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"local_irq_restore\t%0" \
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: "=r" (__tmp1) \
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: "0" (flags) \
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: "memory"); \
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} while(0)
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#define irqs_disabled() \
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({ \
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unsigned long flags; \
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local_save_flags(flags); \
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!(flags & 1); \
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})
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#endif /* _ASM_INTERRUPT_H */
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