forked from Qortal/Brooklyn
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
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/*
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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) 2002, 2004, 2007 by Ralf Baechle
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* Copyright (C) 2007 Maciej W. Rozycki
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*/
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#ifndef _ASM_WAR_H
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#define _ASM_WAR_H
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/*
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* Work around certain R4000 CPU errata (as implemented by GCC):
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*
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* - A double-word or a variable shift may give an incorrect result
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* if executed immediately after starting an integer division:
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* "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0",
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* erratum #28
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* "MIPS R4000MC Errata, Processor Revision 2.2 and 3.0", erratum
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* #19
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*
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* - A double-word or a variable shift may give an incorrect result
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* if executed while an integer multiplication is in progress:
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* "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0",
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* errata #16 & #28
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*
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* - An integer division may give an incorrect result if started in
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* a delay slot of a taken branch or a jump:
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* "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0",
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* erratum #52
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*/
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#ifdef CONFIG_CPU_R4000_WORKAROUNDS
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#define R4000_WAR 1
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#else
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#define R4000_WAR 0
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#endif
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/*
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* Work around certain R4400 CPU errata (as implemented by GCC):
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*
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* - A double-word or a variable shift may give an incorrect result
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* if executed immediately after starting an integer division:
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* "MIPS R4400MC Errata, Processor Revision 1.0", erratum #10
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* "MIPS R4400MC Errata, Processor Revision 2.0 & 3.0", erratum #4
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*/
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#ifdef CONFIG_CPU_R4400_WORKAROUNDS
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#define R4400_WAR 1
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#else
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#define R4400_WAR 0
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#endif
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/*
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* Work around the "daddi" and "daddiu" CPU errata:
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*
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* - The `daddi' instruction fails to trap on overflow.
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* "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0",
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* erratum #23
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*
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* - The `daddiu' instruction can produce an incorrect result.
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* "MIPS R4000PC/SC Errata, Processor Revision 2.2 and 3.0",
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* erratum #41
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* "MIPS R4000MC Errata, Processor Revision 2.2 and 3.0", erratum
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* #15
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* "MIPS R4400PC/SC Errata, Processor Revision 1.0", erratum #7
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* "MIPS R4400MC Errata, Processor Revision 1.0", erratum #5
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*/
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#ifdef CONFIG_CPU_DADDI_WORKAROUNDS
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#define DADDI_WAR 1
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#else
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#define DADDI_WAR 0
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#endif
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#endif /* _ASM_WAR_H */
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