diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/sparc/sparc/iommureg.h | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/sys/arch/sparc/sparc/iommureg.h b/sys/arch/sparc/sparc/iommureg.h index 5ef5b65184d..ac364550922 100644 --- a/sys/arch/sparc/sparc/iommureg.h +++ b/sys/arch/sparc/sparc/iommureg.h @@ -1,5 +1,5 @@ -/* $OpenBSD: iommureg.h,v 1.5 1998/04/30 06:27:17 deraadt Exp $ */ -/* $NetBSD: iommureg.h,v 1.3 1997/09/14 19:16:04 pk Exp $ */ +/* $OpenBSD: iommureg.h,v 1.6 1998/05/10 21:11:53 art Exp $ */ +/* $NetBSD: iommureg.h,v 1.5 1998/05/04 23:16:59 pk Exp $ */ /* * Copyright (c) 1996 @@ -61,20 +61,17 @@ struct iommureg { #define IOMMU_FLUSH_MASK 0xfffff000 /* - * On SS4/SS5 machines, read something back from the IOMMU control - * space after writing to a flush register to drain write buffers (?). - * This seems to avoid utter lossage on these machines where our caller + * A few empty cycles after touching the IOMMU registers seems to + * avoid utter lossage on some machines (SS4s & SS5s) where our caller * would see some of its local (`%lx') registers trashed. */ #define IOMMU_FLUSHPAGE(sc, va) do { \ (sc)->sc_reg->io_flushpage = (va) & IOMMU_FLUSH_MASK; \ - if (cpuinfo.cpu_type == CPUTYP_MS2) \ - (*(volatile u_int32_t *)&(sc)->sc_reg->io_bar); \ + __asm("nop;nop;nop;"); \ } while (0); #define IOMMU_FLUSHALL(sc) do { \ (sc)->sc_reg->io_flashclear = 0; \ - if (cpuinfo.cpu_type == CPUTYP_MS2) \ - (*(volatile u_int32_t *)&(sc)->sc_reg->io_bar); \ + __asm("nop;nop;nop;"); \ } while (0) /* to pte.h ? */ |