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Add support for userland to access I/O port space. This is primarily

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added for XFree86. There are 2 reasons for doing this with sysarch():
1. The memory mapped I/O space is not at a fixed physical address. An
   application has to use some interface to get the base address. It
   gets worse if the machine has multiple memory mapped I/O spaces.
2. Access to the memory mapped I/O space needs to happen through a
   translation that is flagged as uncachable. There's no interface
   that allows a process to do uncached memory I/O, other than though
   /dev/mem (possibly).

So, until we either disallow direct access to I/O or bus space from
userland or have a better way of doing this, sysarch() has the least
negative impact on existing interfaces.
This commit is contained in:
marcel 2003-10-27 05:45:35 +00:00
parent 3543793158
commit 367436bcad
2 changed files with 83 additions and 40 deletions
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98
sys/ia64/ia64/sys_machdep.c
View File

@ -1,22 +1,17 @@
/*-
/*
* Copyright (c) 2003 Marcel Moolenaar
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
@ -29,33 +24,19 @@
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
* $FreeBSD$
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <sys/lock.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_extern.h>
#include <sys/user.h>
#include <machine/cpu.h>
#include <machine/sysarch.h>
#include <vm/vm_kern.h> /* for kernel_map */
#include <machine/fpu.h>
#ifndef _SYS_SYSPROTO_H_
struct sysarch_args {
int op;
@ -64,13 +45,74 @@ struct sysarch_args {
#endif
int
sysarch(td, uap)
struct thread *td;
register struct sysarch_args *uap;
sysarch(struct thread *td, struct sysarch_args *uap)
{
struct ia64_iodesc iod;
int error;
error = 0;
switch(uap->op) {
case IA64_IORD:
copyin(uap->parms, &iod, sizeof(iod));
switch (iod.width) {
case 1:
iod.val = inb(iod.port);
break;
case 2:
if (iod.port & 1) {
iod.val = inb(iod.port);
iod.val |= inb(iod.port + 1) << 8;
} else
iod.val = inw(iod.port);
break;
case 4:
if (iod.port & 3) {
if (iod.port & 1) {
iod.val = inb(iod.port);
iod.val |= inw(iod.port + 1) << 8;
iod.val |= inb(iod.port + 3) << 24;
} else {
iod.val = inw(iod.port);
iod.val |= inw(iod.port + 2) << 16;
}
} else
iod.val = inl(iod.port);
break;
default:
error = EINVAL;
}
copyout(&iod, uap->parms, sizeof(iod));
break;
case IA64_IOWR:
copyin(uap->parms, &iod, sizeof(iod));
switch (iod.width) {
case 1:
outb(iod.port, iod.val);
break;
case 2:
if (iod.port & 1) {
outb(iod.port, iod.val);
outb(iod.port + 1, iod.val >> 8);
} else
outw(iod.port, iod.val);
break;
case 4:
if (iod.port & 3) {
if (iod.port & 1) {
outb(iod.port, iod.val);
outw(iod.port + 1, iod.val >> 8);
outb(iod.port + 3, iod.val >> 24);
} else {
outw(iod.port, iod.val);
outw(iod.port + 2, iod.val >> 16);
}
} else
outl(iod.port, iod.val);
break;
default:
error = EINVAL;
}
break;
default:
error = EINVAL;
break;

25
sys/ia64/include/sysarch.h
View File

@ -1,22 +1,17 @@
/*-
/*
* Copyright (c) 2003 Marcel Moolenaar
* Copyright (c) 1993 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
@ -33,11 +28,17 @@
* $FreeBSD$
*/
/*
* Architecture specific syscalls (alpha)
*/
#ifndef _MACHINE_SYSARCH_H_
#define _MACHINE_SYSARCH_H_
#define _MACHINE_SYSARCH_H_
#define IA64_IORD 0
#define IA64_IOWR 1
struct ia64_iodesc {
int port;
int width;
unsigned long val;
};
#ifndef _KERNEL
#include <sys/cdefs.h>