| /* |
| * 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 |
| |
| #include <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 |
| |
| /* |
| * Another R4600 erratum. Due to the lack of errata information the exact |
| * technical details aren't known. I've experimentally found that disabling |
| * interrupts during indexed I-cache flushes seems to be sufficient to deal |
| * with the issue. |
| */ |
| #ifndef R4600_V1_INDEX_ICACHEOP_WAR |
| #error Check setting of R4600_V1_INDEX_ICACHEOP_WAR for your platform |
| #endif |
| |
| /* |
| * Pleasures of the R4600 V1.x. Cite from the IDT R4600 V1.7 errata: |
| * |
| * 18. The CACHE instructions Hit_Writeback_Invalidate_D, Hit_Writeback_D, |
| * Hit_Invalidate_D and Create_Dirty_Excl_D should only be |
| * executed if there is no other dcache activity. If the dcache is |
| * accessed for another instruction immeidately preceding when these |
| * cache instructions are executing, it is possible that the dcache |
| * tag match outputs used by these cache instructions will be |
| * incorrect. These cache instructions should be preceded by at least |
| * four instructions that are not any kind of load or store |
| * instruction. |
| * |
| * This is not allowed: lw |
| * nop |
| * nop |
| * nop |
| * cache Hit_Writeback_Invalidate_D |
| * |
| * This is allowed: lw |
| * nop |
| * nop |
| * nop |
| * nop |
| * cache Hit_Writeback_Invalidate_D |
| */ |
| #ifndef R4600_V1_HIT_CACHEOP_WAR |
| #error Check setting of R4600_V1_HIT_CACHEOP_WAR for your platform |
| #endif |
| |
| |
| /* |
| * Writeback and invalidate the primary cache dcache before DMA. |
| * |
| * R4600 v2.0 bug: "The CACHE instructions Hit_Writeback_Inv_D, |
| * Hit_Writeback_D, Hit_Invalidate_D and Create_Dirty_Exclusive_D will only |
| * operate correctly if the internal data cache refill buffer is empty. These |
| * CACHE instructions should be separated from any potential data cache miss |
| * by a load instruction to an uncached address to empty the response buffer." |
| * (Revision 2.0 device errata from IDT available on http://www.idt.com/ |
| * in .pdf format.) |
| */ |
| #ifndef R4600_V2_HIT_CACHEOP_WAR |
| #error Check setting of R4600_V2_HIT_CACHEOP_WAR for your platform |
| #endif |
| |
| /* |
| * When an interrupt happens on a CP0 register read instruction, CPU may |
| * lock up or read corrupted values of CP0 registers after it enters |
| * the exception handler. |
| * |
| * This workaround makes sure that we read a "safe" CP0 register as the |
| * first thing in the exception handler, which breaks one of the |
| * pre-conditions for this problem. |
| */ |
| #ifndef R5432_CP0_INTERRUPT_WAR |
| #error Check setting of R5432_CP0_INTERRUPT_WAR for your platform |
| #endif |
| |
| /* |
| * Workaround for the Sibyte M3 errata the text of which can be found at |
| * |
| * http://sibyte.broadcom.com/hw/bcm1250/docs/pass2errata.txt |
| * |
| * This will enable the use of a special TLB refill handler which does a |
| * consistency check on the information in c0_badvaddr and c0_entryhi and |
| * will just return and take the exception again if the information was |
| * found to be inconsistent. |
| */ |
| #ifndef BCM1250_M3_WAR |
| #error Check setting of BCM1250_M3_WAR for your platform |
| #endif |
| |
| /* |
| * This is a DUART workaround related to glitches around register accesses |
| */ |
| #ifndef SIBYTE_1956_WAR |
| #error Check setting of SIBYTE_1956_WAR for your platform |
| #endif |
| |
| /* |
| * Fill buffers not flushed on CACHE instructions |
| * |
| * Hit_Invalidate_I cacheops invalidate an icache line but the refill |
| * for that line can get stale data from the fill buffer instead of |
| * accessing memory if the previous icache miss was also to that line. |
| * |
| * Workaround: generate an icache refill from a different line |
| * |
| * Affects: |
| * MIPS 4K RTL revision <3.0, PRID revision <4 |
| */ |
| #ifndef MIPS4K_ICACHE_REFILL_WAR |
| #error Check setting of MIPS4K_ICACHE_REFILL_WAR for your platform |
| #endif |
| |
| /* |
| * Missing implicit forced flush of evictions caused by CACHE |
| * instruction |
| * |
| * Evictions caused by a CACHE instructions are not forced on to the |
| * bus. The BIU gives higher priority to fetches than to the data from |
| * the eviction buffer and no collision detection is performed between |
| * fetches and pending data from the eviction buffer. |
| * |
| * Workaround: Execute a SYNC instruction after the cache instruction |
| * |
| * Affects: |
| * MIPS 5Kc,5Kf RTL revision <2.3, PRID revision <8 |
| * MIPS 20Kc RTL revision <4.0, PRID revision <? |
| */ |
| #ifndef MIPS_CACHE_SYNC_WAR |
| #error Check setting of MIPS_CACHE_SYNC_WAR for your platform |
| #endif |
| |
| /* |
| * From TX49/H2 manual: "If the instruction (i.e. CACHE) is issued for |
| * the line which this instruction itself exists, the following |
| * operation is not guaranteed." |
| * |
| * Workaround: do two phase flushing for Index_Invalidate_I |
| */ |
| #ifndef TX49XX_ICACHE_INDEX_INV_WAR |
| #error Check setting of TX49XX_ICACHE_INDEX_INV_WAR for your platform |
| #endif |
| |
| /* |
| * On the RM9000 there is a problem which makes the CreateDirtyExclusive |
| * eache operation unusable on SMP systems. |
| */ |
| #ifndef RM9000_CDEX_SMP_WAR |
| #error Check setting of RM9000_CDEX_SMP_WAR for your platform |
| #endif |
| |
| /* |
| * The RM7000 processors and the E9000 cores have a bug (though PMC-Sierra |
| * opposes it being called that) where invalid instructions in the same |
| * I-cache line worth of instructions being fetched may case spurious |
| * exceptions. |
| */ |
| #ifndef ICACHE_REFILLS_WORKAROUND_WAR |
| #error Check setting of ICACHE_REFILLS_WORKAROUND_WAR for your platform |
| #endif |
| |
| /* |
| * On the R10000 upto version 2.6 (not sure about 2.7) there is a bug that |
| * may cause ll / sc and lld / scd sequences to execute non-atomically. |
| */ |
| #ifndef R10000_LLSC_WAR |
| #error Check setting of R10000_LLSC_WAR for your platform |
| #endif |
| |
| /* |
| * 34K core erratum: "Problems Executing the TLBR Instruction" |
| */ |
| #ifndef MIPS34K_MISSED_ITLB_WAR |
| #error Check setting of MIPS34K_MISSED_ITLB_WAR for your platform |
| #endif |
| |
| #endif /* _ASM_WAR_H */ |