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20d60d9973
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> |
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| .. | ||
| au1000 | ||
| basler/excite | ||
| bcm47xx | ||
| boot | ||
| cobalt | ||
| configs | ||
| dec | ||
| emma2rh | ||
| fw | ||
| gt64120/wrppmc | ||
| jazz | ||
| jmr3927 | ||
| kernel | ||
| lasat | ||
| lemote/lm2e | ||
| lib | ||
| math-emu | ||
| mips-boards | ||
| mipssim | ||
| mm | ||
| oprofile | ||
| pci | ||
| philips/pnx8550 | ||
| pmc-sierra | ||
| qemu | ||
| sgi-ip22 | ||
| sgi-ip27 | ||
| sgi-ip32 | ||
| sibyte | ||
| sni | ||
| tx4927 | ||
| tx4938 | ||
| vr41xx | ||
| defconfig | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||