1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00
freebsd/sys/boot/ofw/libofw/ofw_copy.c
Andreas Tobler da068879c5 Check the real-mode? OF property to find out whether we operate in real or
virtual mode. In virtual mode we have to do memory mapping. On PowerMacs it is
usually false while on pSeries we have found that it is true. The real-mode?
property is not available on sparc64.

Approved by: 	nwhitehorn (mentor)
2010-11-17 19:35:56 +00:00

174 lines
4.5 KiB
C

/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* MD primitives supporting placement of module data
*
* XXX should check load address/size against memory top.
*/
#include <stand.h>
#include "libofw.h"
#define READIN_BUF (4 * 1024)
#define PAGE_SIZE 0x1000
#define PAGE_MASK 0x0fff
#define MAPMEM_PAGE_INC 16
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
static int
ofw_mapmem(vm_offset_t dest, const size_t len)
{
void *destp, *addr;
size_t dlen;
size_t resid;
size_t nlen;
static vm_offset_t last_dest = 0;
static size_t last_len = 0;
nlen = len;
/*
* Check to see if this region fits in a prior mapping.
* Allocations are generally sequential, so only check
* the last one.
*/
if (dest >= last_dest &&
(dest + len) <= (last_dest + last_len)) {
return (0);
}
/*
* Trim area covered by existing mapping, if any
*/
if (dest < (last_dest + last_len) && dest >= last_dest) {
nlen -= (last_dest + last_len) - dest;
dest = last_dest + last_len;
}
destp = (void *)(dest & ~PAGE_MASK);
resid = dest & PAGE_MASK;
/*
* To avoid repeated mappings on small allocations,
* never map anything less than MAPMEM_PAGE_INC pages at a time
*/
if ((nlen + resid) < PAGE_SIZE*MAPMEM_PAGE_INC) {
dlen = PAGE_SIZE*MAPMEM_PAGE_INC;
} else
dlen = roundup(nlen + resid, PAGE_SIZE);
if (OF_call_method("claim", memory, 3, 1, destp, dlen, 0, &addr)
== -1) {
printf("ofw_mapmem: physical claim failed\n");
return (ENOMEM);
}
/*
* We only do virtual memory management when real_mode is false.
*/
if (real_mode == 0) {
if (OF_call_method("claim", mmu, 3, 1, destp, dlen, 0, &addr)
== -1) {
printf("ofw_mapmem: virtual claim failed\n");
return (ENOMEM);
}
if (OF_call_method("map", mmu, 4, 0, destp, destp, dlen, 0)
== -1) {
printf("ofw_mapmem: map failed\n");
return (ENOMEM);
}
}
last_dest = (vm_offset_t) destp;
last_len = dlen;
return (0);
}
ssize_t
ofw_copyin(const void *src, vm_offset_t dest, const size_t len)
{
if (ofw_mapmem(dest, len)) {
printf("ofw_copyin: map error\n");
return (0);
}
bcopy(src, (void *)dest, len);
return(len);
}
ssize_t
ofw_copyout(const vm_offset_t src, void *dest, const size_t len)
{
bcopy((void *)src, dest, len);
return(len);
}
ssize_t
ofw_readin(const int fd, vm_offset_t dest, const size_t len)
{
void *buf;
size_t resid, chunk, get;
ssize_t got;
vm_offset_t p;
p = dest;
chunk = min(READIN_BUF, len);
buf = malloc(chunk);
if (buf == NULL) {
printf("ofw_readin: buf malloc failed\n");
return(0);
}
if (ofw_mapmem(dest, len)) {
printf("ofw_readin: map error\n");
free(buf);
return (0);
}
for (resid = len; resid > 0; resid -= got, p += got) {
get = min(chunk, resid);
got = read(fd, buf, get);
if (got <= 0) {
if (got < 0)
printf("ofw_readin: read failed\n");
break;
}
bcopy(buf, (void *)p, got);
}
free(buf);
return(len - resid);
}