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