diff options
Diffstat (limited to 'sys/arch/mvme88k/dev/vmes.c')
| -rw-r--r-- | sys/arch/mvme88k/dev/vmes.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/sys/arch/mvme88k/dev/vmes.c b/sys/arch/mvme88k/dev/vmes.c index 5a52244f754..2a81cf8c7f9 100644 --- a/sys/arch/mvme88k/dev/vmes.c +++ b/sys/arch/mvme88k/dev/vmes.c @@ -1,4 +1,4 @@ -/* $OpenBSD: vmes.c,v 1.13 2003/12/19 22:30:18 miod Exp $ */ +/* $OpenBSD: vmes.c,v 1.14 2003/12/25 21:01:39 miod Exp $ */ /* * Copyright (c) 1995 Theo de Raadt @@ -172,3 +172,36 @@ vmesmmap(dev, off, prot) return (-1); return (atop(pa)); } + +/* + * Specific D16 access functions + * + * D16 cards will trigger bus errors on attempting to read or write more + * than 16 bits on the bus. Given how the m88k processor works, this means + * basically that all long (D32) accesses must be carefully taken care of. + * + * Since the kernels bcopy() and bzero() routines will use 32 bit accesses + * for performance, here are specific D16-compatible routines. They expect + * pointers to be 16-bit aligned. + */ + +void +d16_bcopy(const void *src, void *dst, size_t len) +{ + const u_int16_t *s = (const u_int16_t *)src; + u_int16_t *d = (u_int16_t *)dst; + + len >>= 1; + while (len-- != 0) + *d++ = *s++; +} + +void +d16_bzero(void *dst, size_t len) +{ + u_int16_t *d = (u_int16_t *)dst; + + len >>= 1; + while (len-- != 0) + *d++ = 0; +} |