Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mmmmap() should return -1, not ENOTSUP. 

Optimize the case of writing to /dev/zero etc, like the alpha,i386 and m68k.
This commit is contained in:
pk 1997-04-19 21:28:53 +00:00
parent 231a4bfb1f
commit 43445623fd
1 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
sys/arch/sparc/sparc/mem.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: mem.c,v 1.13 1996/03/30 21:12:16 christos Exp $ */
/* $NetBSD: mem.c,v 1.14 1997/04/19 21:28:53 pk Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -120,7 +120,7 @@ mmrw(dev, uio, flags)
}
switch (minor(dev)) {
/* minor device 0 is physical memory */
/* minor device 0 is physical memory */
case 0:
v = uio->uio_offset;
if (!pmap_pa_exists(v)) {
@ -135,9 +135,9 @@ mmrw(dev, uio, flags)
error = uiomove((caddr_t)vmmap + o, c, uio);
pmap_remove(pmap_kernel(), (vm_offset_t)vmmap,
(vm_offset_t)vmmap + NBPG);
continue;
break;
/* minor device 1 is kernel memory */
/* minor device 1 is kernel memory */
case 1:
v = uio->uio_offset;
if (v >= MSGBUF_VA && v < MSGBUF_VA+NBPG) {
@ -153,9 +153,9 @@ mmrw(dev, uio, flags)
return (EFAULT);
}
error = uiomove((caddr_t)v, c, uio);
continue;
break;
/* minor device 2 is EOF/RATHOLE */
/* minor device 2 is EOF/RATHOLE */
case 2:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
@ -164,21 +164,27 @@ mmrw(dev, uio, flags)
/* XXX should add sbus, etc */
#if defined(SUN4)
/* minor device 11 (/dev/eeprom) is the old-style (a'la Sun 3) EEPROM */
/*
* minor device 11 (/dev/eeprom) is the old-style
* (a'la Sun 3) EEPROM.
*/
case 11:
if (cputyp == CPU_SUN4)
error = eeprom_uio(uio);
else
error = ENXIO;
continue;
break;
#endif /* SUN4 */
/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
/*
* minor device 12 (/dev/zero) is source of nulls on read,
* rathole on write.
*/
case 12:
if (uio->uio_rw == UIO_WRITE) {
c = iov->iov_len;
break;
uio->uio_resid = 0;
return(0);
}
if (zeropage == NULL) {
zeropage = (caddr_t)
@ -187,17 +193,11 @@ mmrw(dev, uio, flags)
}
c = min(iov->iov_len, CLBYTES);
error = uiomove(zeropage, c, uio);
continue;
break;
default:
return (ENXIO);
}
if (error)
break;
iov->iov_base += c;
iov->iov_len -= c;
uio->uio_offset += c;
uio->uio_resid -= c;
}
if (minor(dev) == 0) {
unlock:
@ -214,5 +214,5 @@ mmmmap(dev, off, prot)
int off, prot;
{
return (EOPNOTSUPP);
return (-1);
}