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patch from Guido van Rooij <guido@gvr.win.tue.nl> to make ioports 

work "normally," i.e. not randomly, and only when /dev/mem is opened.
This commit is contained in:
cgd 1993-05-16 03:42:46 +00:00
parent 5f3534d355
commit 3d1ec1bf97
2 changed files with 43 additions and 1 deletions
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6
sys/arch/i386/i386/machdep.c
View File

@ -44,7 +44,7 @@
* 15 Aug 92 William Jolitz Large memory bug * 15 Aug 92 William Jolitz Large memory bug
* 15 Aug 92 Terry Lambert Fixed CMOS RAM size bug * 15 Aug 92 Terry Lambert Fixed CMOS RAM size bug
*/ */
static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/i386/machdep.c,v 1.10 1993/05/13 21:39:36 deraadt Exp $"; static char rcsid[] = "$Header: /cvsroot/src/sys/arch/i386/i386/machdep.c,v 1.11 1993/05/16 03:42:46 cgd Exp $";
#include "param.h" #include "param.h"
#include "systm.h" #include "systm.h"
@ -959,6 +959,10 @@ init386(first)
proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG;
proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ;
_gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); _gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt =
(sizeof(tss))<<16;
ltr(_gsel_tss); ltr(_gsel_tss);
/* make a call gate to reenter kernel with */ /* make a call gate to reenter kernel with */

38
sys/arch/i386/i386/mem.c
View File

@ -50,8 +50,10 @@
#include "systm.h" #include "systm.h"
#include "uio.h" #include "uio.h"
#include "malloc.h" #include "malloc.h"
#include "proc.h"
#include "machine/cpu.h" #include "machine/cpu.h"
#include "machine/psl.h"
#include "vm/vm_param.h" #include "vm/vm_param.h"
#include "vm/lock.h" #include "vm/lock.h"
@ -61,6 +63,42 @@
extern char *vmmap; /* poor name! */ extern char *vmmap; /* poor name! */
/*ARGSUSED*/ /*ARGSUSED*/
mmclose(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct syscframe *fp;
switch (minor(dev)) {
case 14:
fp = (struct syscframe *)curproc->p_regs;
fp->sf_eflags &= ~PSL_IOPL;
break;
default:
break;
}
return(0);
}
/*ARGSUSED*/
mmopen(dev, uio, flags)
dev_t dev;
struct uio *uio;
int flags;
{
struct syscframe *fp;
switch (minor(dev)) {
case 14:
fp = (struct syscframe *)curproc->p_regs;
fp->sf_eflags |= PSL_IOPL;
break;
default:
break;
}
return(0);
}
/*ARGSUSED*/
mmrw(dev, uio, flags) mmrw(dev, uio, flags)
dev_t dev; dev_t dev;
struct uio *uio; struct uio *uio;