diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 1995-10-19 02:54:49 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 1995-10-19 02:54:49 +0000 |
| commit | 6f7803c818704347720dede645cb2b57161d8f12 (patch) | |
| tree | f8c201d2b62fcae918d9acd7be19d6085f7237a6 /sys | |
| parent | 753b8fab14ddb3c6bb308d25dcad3b9b2051afe3 (diff) | |
4/300 cache is writethrough; but... it fails to update pte's in the cache
problem reported by chuck cranor
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/sparc/sparc/cpu.c | 1 | ||||
| -rw-r--r-- | sys/arch/sparc/sparc/pmap.c | 8 |
2 files changed, 8 insertions, 1 deletions
diff --git a/sys/arch/sparc/sparc/cpu.c b/sys/arch/sparc/sparc/cpu.c index a445aff07c3..43437db234b 100644 --- a/sys/arch/sparc/sparc/cpu.c +++ b/sys/arch/sparc/sparc/cpu.c @@ -188,6 +188,7 @@ cpu_attach(parent, dev, aux) case SUN4_300: sprintf(cpu_model, "SUN-4/300 series (%s FPU)", fpuname); bug = 1; + vactype = VAC_WRITETHROUGH; cacheinfo.c_totalsize = 128*1024; cacheinfo.c_hwflush = 0; cacheinfo.c_linesize = 16; diff --git a/sys/arch/sparc/sparc/pmap.c b/sys/arch/sparc/sparc/pmap.c index d59b38be582..38c717eb532 100644 --- a/sys/arch/sparc/sparc/pmap.c +++ b/sys/arch/sparc/sparc/pmap.c @@ -2857,7 +2857,13 @@ pmap_changeprot(pm, va, prot, wired) setcontext(ctx); goto useless; } - if (vactype == VAC_WRITEBACK && + + /* + * the latter check deals with a writethrough cache + * problem on the 4/300 + */ + if ((vactype==VAC_WRITEBACK || + (vactype==VAC_WRITETHROUGH && cputyp==CPU_SUN4)) && (tpte & (PG_U|PG_NC|PG_TYPE)) == (PG_U|PG_OBMEM)) cache_flush_page((int)va); } else { |