David Miller wrote:
From: Chris Newport <crn@xxxxxxxxxxx>
Date: Fri, 21 Jul 2006 23:03:31 +0100
A year or so ago I did a few patches for Sun4d and there was a note in
the iommu code about sun4d not having a register that was used for
scratch data in sun4m.
Could this bug be back ?
Sorry to be vague, this is from memory.
It would be nice to have something specific, I see nothing
explicit in the current tree:
I have not been able to find the file with the relevant comment, but
looking back in my mail archive, it seems to relate to this code in
2.4.26 include/asm-sparc/winmacro.h, looks like jj has created a workaround.
Maybe need to look at earlier 2.4 versions before the comment got dropped.
#ifdef CONFIG_SMP
#define LOAD_CURRENT4M(dest_reg, idreg) \
rd %tbr, %idreg; \
sethi %hi(C_LABEL(current_set)), %dest_reg; \
srl %idreg, 10, %idreg; \
or %dest_reg, %lo(C_LABEL(current_set)), %dest_reg; \
and %idreg, 0xc, %idreg; \
ld [%idreg + %dest_reg], %dest_reg;
/* Sliiick. We have a Linux current register :) -jj */
#define LOAD_CURRENT4D(dest_reg) \
lda [%g0] ASI_M_VIKING_TMP2, %dest_reg;
/* Blackbox - take care with this... - check smp4m and smp4d before
changing thi
s. */
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