diff options
author | marcel <marcel@FreeBSD.org> | 2003-10-27 05:45:35 +0000 |
---|---|---|
committer | marcel <marcel@FreeBSD.org> | 2003-10-27 05:45:35 +0000 |
commit | 367436bcadb7f735a7a85f214623259b18253bb1 (patch) | |
tree | f961607136662268e656a9c00d0cd095ad45b9cb | |
parent | 35437931588e73b03c80685c823cb7964a829ebf (diff) | |
download | FreeBSD-src-367436bcadb7f735a7a85f214623259b18253bb1.zip FreeBSD-src-367436bcadb7f735a7a85f214623259b18253bb1.tar.gz |
Add support for userland to access I/O port space. This is primarily
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.
-rw-r--r-- | sys/ia64/ia64/sys_machdep.c | 98 | ||||
-rw-r--r-- | sys/ia64/include/sysarch.h | 25 |
2 files changed, 83 insertions, 40 deletions
diff --git a/sys/ia64/ia64/sys_machdep.c b/sys/ia64/ia64/sys_machdep.c index aecae85..c032a8c 100644 --- a/sys/ia64/ia64/sys_machdep.c +++ b/sys/ia64/ia64/sys_machdep.c @@ -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; diff --git a/sys/ia64/include/sysarch.h b/sys/ia64/include/sysarch.h index b990bcd..d4a0b01 100644 --- a/sys/ia64/include/sysarch.h +++ b/sys/ia64/include/sysarch.h @@ -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> |