File: [local] / sys / uvm / uvm_io.c (download)
Revision 1.1.1.1 (vendor branch), Tue Mar 4 16:15:22 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)
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/* $OpenBSD: uvm_io.c,v 1.16 2005/11/04 21:48:07 miod Exp $ */
/* $NetBSD: uvm_io.c,v 1.12 2000/06/27 17:29:23 mrg Exp $ */
/*
*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
* 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 Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* from: Id: uvm_io.c,v 1.1.2.2 1997/12/30 12:02:00 mrg Exp
*/
/*
* uvm_io.c: uvm i/o ops
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mman.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/uio.h>
#include <uvm/uvm.h>
/*
* functions
*/
/*
* uvm_io: perform I/O on a map
*
* => caller must have a reference to "map" so that it doesn't go away
* while we are working.
*/
int
uvm_io(vm_map_t map, struct uio *uio, int flags)
{
vaddr_t baseva, endva, pageoffset, kva;
vsize_t chunksz, togo, sz;
vm_map_entry_t dead_entries;
int error, extractflags;
/*
* step 0: sanity checks and set up for copy loop. start with a
* large chunk size. if we have trouble finding vm space we will
* reduce it.
*/
if (uio->uio_resid == 0)
return(0);
togo = uio->uio_resid;
baseva = (vaddr_t) uio->uio_offset;
endva = baseva + (togo - 1);
if (endva < baseva) /* wrap around? */
return(EIO);
if (baseva >= VM_MAXUSER_ADDRESS)
return(0);
if (endva >= VM_MAXUSER_ADDRESS)
/* EOF truncate */
togo = togo - (endva - VM_MAXUSER_ADDRESS + 1);
pageoffset = baseva & PAGE_MASK;
baseva = trunc_page(baseva);
chunksz = min(round_page(togo + pageoffset), MAXBSIZE);
error = 0;
extractflags = UVM_EXTRACT_QREF | UVM_EXTRACT_CONTIG;
if (flags & UVM_IO_FIXPROT)
extractflags |= UVM_EXTRACT_FIXPROT;
/*
* step 1: main loop... while we've got data to move
*/
for (/*null*/; togo > 0 ; pageoffset = 0) {
/*
* step 2: extract mappings from the map into kernel_map
*/
error = uvm_map_extract(map, baseva, chunksz, kernel_map, &kva,
extractflags);
if (error) {
/* retry with a smaller chunk... */
if (error == ENOMEM && chunksz > PAGE_SIZE) {
chunksz = trunc_page(chunksz / 2);
if (chunksz < PAGE_SIZE)
chunksz = PAGE_SIZE;
continue;
}
break;
}
/*
* step 3: move a chunk of data
*/
sz = chunksz - pageoffset;
if (sz > togo)
sz = togo;
error = uiomove((caddr_t) (kva + pageoffset), sz, uio);
togo -= sz;
baseva += chunksz;
/*
* step 4: unmap the area of kernel memory
*/
vm_map_lock(kernel_map);
uvm_unmap_remove(kernel_map, kva, kva+chunksz,
&dead_entries, NULL);
vm_map_unlock(kernel_map);
if (dead_entries != NULL)
uvm_unmap_detach(dead_entries, AMAP_REFALL);
/*
* We defer checking the error return from uiomove until
* here so that we won't leak memory.
*/
if (error)
break;
}
/*
* done
*/
return (error);
}