File: [local] / sys / arch / amd64 / amd64 / mem.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:04:59 2008 UTC (16 years, 6 months ago) by nbrk
Branch: OPENBSD_4_2_BASE, MAIN
CVS Tags: jornada-partial-support-wip, HEAD Changes since 1.1: +0 -0 lines
Import of OpenBSD 4.2 release kernel tree with initial code to support
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO
Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)
|
/* $OpenBSD: mem.c,v 1.6 2007/01/15 23:19:05 jsg Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* 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.
*
* @(#)mem.c 8.3 (Berkeley) 1/12/94
*/
/*
* Memory special file
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/ioccom.h>
#include <sys/malloc.h>
#include <sys/memrange.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <machine/cpu.h>
#include <machine/conf.h>
#include <uvm/uvm_extern.h>
caddr_t zeropage;
extern int start, end, etext;
/* open counter for aperture */
#ifdef APERTURE
static int ap_open_count = 0;
extern int allowaperture;
#define VGA_START 0xA0000
#define BIOS_END 0xFFFFF
#endif
/*ARGSUSED*/
int
mmopen(dev_t dev, int flag, int mode, struct proc *p)
{
switch (minor(dev)) {
case 0:
case 1:
case 2:
case 12:
break;
#ifdef APERTURE
case 4:
if (suser(p, 0) != 0 || !allowaperture)
return (EPERM);
/* authorize only one simultaneous open() */
if (ap_open_count > 0)
return(EPERM);
ap_open_count++;
break;
#endif
default:
return (ENXIO);
}
return (0);
}
/*ARGSUSED*/
int
mmclose(dev_t dev, int flag, int mode, struct proc *p)
{
#ifdef APERTURE
if (minor(dev) == 4)
ap_open_count--;
#endif
return (0);
}
/*ARGSUSED*/
int
mmrw(dev_t dev, struct uio *uio, int flags)
{
extern vaddr_t kern_end;
vaddr_t v;
int c;
struct iovec *iov;
int error = 0;
while (uio->uio_resid > 0 && error == 0) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
if (uio->uio_iovcnt < 0)
panic("mmrw");
continue;
}
switch (minor(dev)) {
/* minor device 0 is physical memory */
case 0:
v = PMAP_DIRECT_MAP(uio->uio_offset);
error = uiomove((caddr_t)v, uio->uio_resid, uio);
continue;
/* minor device 1 is kernel memory */
case 1:
v = uio->uio_offset;
c = min(iov->iov_len, MAXPHYS);
if (v >= (vaddr_t)&start && v < kern_end) {
if (v < (vaddr_t)&etext &&
uio->uio_rw == UIO_WRITE)
return EFAULT;
} else if ((!uvm_kernacc((caddr_t)v, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE)) &&
(v < PMAP_DIRECT_BASE && v > PMAP_DIRECT_END))
return (EFAULT);
error = uiomove((caddr_t)v, c, uio);
continue;
/* minor device 2 is EOF/RATHOLE */
case 2:
if (uio->uio_rw == UIO_WRITE)
uio->uio_resid = 0;
return (0);
/* 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;
}
if (zeropage == NULL) {
zeropage = (caddr_t)
malloc(PAGE_SIZE, M_TEMP, M_WAITOK);
bzero(zeropage, PAGE_SIZE);
}
c = min(iov->iov_len, PAGE_SIZE);
error = uiomove(zeropage, c, uio);
continue;
default:
return (ENXIO);
}
iov->iov_base += c;
iov->iov_len -= c;
uio->uio_offset += c;
uio->uio_resid -= c;
}
return (error);
}
paddr_t
mmmmap(dev_t dev, off_t off, int prot)
{
struct proc *p = curproc; /* XXX */
switch (minor(dev)) {
/* minor device 0 is physical memory */
case 0:
if ((paddr_t)off > (paddr_t)ctob(physmem) && suser(p, 0) != 0)
return -1;
return atop(off);
#ifdef APERTURE
/* minor device 4 is aperture driver */
case 4:
switch (allowaperture) {
case 1:
/* Allow mapping of the VGA framebuffer & BIOS only */
if ((off >= VGA_START && off <= BIOS_END) ||
(unsigned)off > (unsigned)ctob(physmem))
return atop(off);
else
return -1;
case 2:
/* Allow mapping of the whole 1st megabyte
for x86emu */
if (off <= BIOS_END ||
(unsigned)off > (unsigned)ctob(physmem))
return atop(off);
else
return -1;
default:
return -1;
}
#endif
default:
return -1;
}
}
int
mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
{
return (ENODEV);
}