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authorMaciej W. Rozycki <macro@linux-mips.org>2007-10-23 07:43:11 -0400
committerRalf Baechle <ralf@linux-mips.org>2008-01-29 05:14:54 -0500
commit20d60d9973c3b441902b0a3f4f6f7e7ade08f77d (patch)
tree2dbadcb5600fcb486612ec30d972e6c29195ee1d /arch/mips/Makefile
parent2b22c034d04d3632a339d14d5803c8f94e412608 (diff)
[MIPS] R4000/R4400 errata workarounds
This is the gereric part of R4000/R4400 errata workarounds. They include compiler and assembler support as well as some source code modifications to address the problems with some combinations of multiply/divide+shift instructions as well as the daddi and daddiu instructions. Changes included are as follows: 1. New Kconfig options to select workarounds by platforms as necessary. 2. Arch top-level Makefile to pass necessary options to the compiler; also incompatible configurations are detected (-mno-sym32 unsupported as horribly intrusive for little gain). 3. Bug detection updated and shuffled -- the multiply/divide+shift problem is lethal enough that if not worked around it makes the kernel crash in time_init() because of a division by zero; the daddiu erratum might also trigger early potentially, though I have not observed it. On the other hand the daddi detection code requires the exception subsystem to have been initialised (and is there mainly for information). 4. r4k_daddiu_bug() added so that the existence of the erratum can be queried by code at the run time as necessary; useful for generated code like TLB fault and copy/clear page handlers. 5. __udelay() updated as it uses multiplication in inline assembly. Note that -mdaddi requires modified toolchain (which has been maintained by myself and available from my site for ~4years now -- versions covered are GCC 2.95.4 - 4.1.2 and binutils from 2.13 onwards). The -mfix-r4000 and -mfix-r4400 have been standard for a while though. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Makefile')
-rw-r--r--arch/mips/Makefile12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index a1f8d8b96b03..a49127af33c8 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -141,6 +141,10 @@ cflags-$(CONFIG_CPU_R8000) += -march=r8000 -Wa,--trap
141cflags-$(CONFIG_CPU_R10000) += $(call cc-option,-march=r10000,-march=r8000) \ 141cflags-$(CONFIG_CPU_R10000) += $(call cc-option,-march=r10000,-march=r8000) \
142 -Wa,--trap 142 -Wa,--trap
143 143
144cflags-$(CONFIG_CPU_R4000_WORKAROUNDS) += $(call cc-option,-mfix-r4000,)
145cflags-$(CONFIG_CPU_R4400_WORKAROUNDS) += $(call cc-option,-mfix-r4400,)
146cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS) += $(call cc-option,-mno-daddi,)
147
144ifdef CONFIG_CPU_SB1 148ifdef CONFIG_CPU_SB1
145ifdef CONFIG_SB1_PASS_1_WORKAROUNDS 149ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
146MODFLAGS += -msb1-pass1-workarounds 150MODFLAGS += -msb1-pass1-workarounds
@@ -602,9 +606,11 @@ ifdef CONFIG_64BIT
602 endif 606 endif
603 endif 607 endif
604 608
605 ifeq ($(KBUILD_SYM32), y) 609 ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
606 ifeq ($(call cc-option-yn,-msym32), y) 610 cflags-y += -msym32 -DKBUILD_64BIT_SYM32
607 cflags-y += -msym32 -DKBUILD_64BIT_SYM32 611 else
612 ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
613 $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
608 endif 614 endif
609 endif 615 endif
610endif 616endif