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Code Issues Releases Activity

Avoid 64-bit divisions and modulos. Fixed related overflows for weird

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args.

This driver should not be used, since it calls uiomove() with interrupts
disabled.
This commit is contained in:
Bruce Evans 1998-06-14 10:52:52 +00:00
parent 597035b4db
commit 26d7294956
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=36966
1 changed files with 19 additions and 9 deletions
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28
sys/i386/isa/ctx.c
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@ -8,7 +8,7 @@
* of this software, nor does the author assume any responsibility
* for damages incurred with its use.
*
* $Id: ctx.c,v 1.26 1998/01/24 02:54:17 eivind Exp $
* $Id: ctx.c,v 1.27 1998/06/07 17:10:15 dfr Exp $
*/
/*
@ -281,8 +281,13 @@ ctxwrite(dev_t dev, struct uio * uio, int ioflag)
unit = UNIT(minor(dev));
sr = &(ctx_sr[unit]);
page = uio->uio_offset / PAGESIZE;
offset = uio->uio_offset % PAGESIZE;
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset >= 4 * PAGESIZE)
page = 4; /* EOF */
else
page = (u_int)uio->uio_offset / PAGESIZE;
offset = (u_int)uio->uio_offset % PAGESIZE;
count = min(uio->uio_resid, PAGESIZE - offset);
while ((page >= 0) && (page <= 3) && (count > 0)) {
sr->cp0 &= ~3;
@ -306,8 +311,8 @@ ctxwrite(dev_t dev, struct uio * uio, int ioflag)
outb(sr->iobase + ctx_cp1, sr->cp1);
enable_intr();
page = uio->uio_offset / PAGESIZE;
offset = uio->uio_offset % PAGESIZE;
page = (u_int)uio->uio_offset / PAGESIZE;
offset = (u_int)uio->uio_offset % PAGESIZE;
count = min(uio->uio_resid, PAGESIZE - offset);
}
if (uio->uio_resid > 0)
@ -326,8 +331,13 @@ ctxread(dev_t dev, struct uio * uio, int ioflag)
unit = UNIT(minor(dev));
sr = &(ctx_sr[unit]);
page = uio->uio_offset / PAGESIZE;
offset = uio->uio_offset % PAGESIZE;
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_offset >= 4 * PAGESIZE)
page = 4; /* EOF */
else
page = (u_int)uio->uio_offset / PAGESIZE;
offset = (u_int)uio->uio_offset % PAGESIZE;
count = min(uio->uio_resid, PAGESIZE - offset);
while ((page >= 0) && (page <= 3) && (count > 0)) {
sr->cp0 &= ~3;
@ -349,8 +359,8 @@ ctxread(dev_t dev, struct uio * uio, int ioflag)
outb(sr->iobase + ctx_cp1, sr->cp1);
enable_intr();
page = uio->uio_offset / PAGESIZE;
offset = uio->uio_offset % PAGESIZE;
page = (u_int)uio->uio_offset / PAGESIZE;
offset = (u_int)uio->uio_offset % PAGESIZE;
count = min(uio->uio_resid, PAGESIZE - offset);
}
if (uio->uio_resid > 0)