diff options
Diffstat (limited to 'sys/arch/arc/isa/isa_machdep.h')
| -rw-r--r-- | sys/arch/arc/isa/isa_machdep.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/sys/arch/arc/isa/isa_machdep.h b/sys/arch/arc/isa/isa_machdep.h index 24c104c3deb..060f511356a 100644 --- a/sys/arch/arc/isa/isa_machdep.h +++ b/sys/arch/arc/isa/isa_machdep.h @@ -1,4 +1,4 @@ -/* $OpenBSD: isa_machdep.h,v 1.1 1996/06/24 09:07:18 pefo Exp $ */ +/* $OpenBSD: isa_machdep.h,v 1.2 1996/09/14 15:58:26 pefo Exp $ */ /* * Copyright (c) 1996 Per Fogelstrom @@ -34,6 +34,18 @@ typedef struct arc_isa_bus *isa_chipset_tag_t; +/* + * I/O macros to access isa bus ports/memory. + * At the first glance theese macros may seem inefficient. + * However, the cpu executes an instruction every 7.5ns + * so the bus is much slower so it doesn't matter, really. + */ +#define isa_outb(x,y) outb(isa_io_base + (x), y) +#define isa_inb(x) inb(isa_io_base + (x)) + +extern int isa_io_base; /* Base address for ISA I/O space */ +extern int isa_mem_base; /* Base address for ISA MEM space */ + struct arc_isa_bus { void *ic_data; |