mirror of
https://git.rtems.org/rtems-libbsd/
synced 2025-07-27 12:47:13 +08:00
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/**
|
|
* @file
|
|
*
|
|
* @ingroup rtems_bsd_rtems
|
|
*
|
|
* @brief FreeBSD uma source used pages which where there was an
|
|
* assumption of page alignment. Doing this alignment would waste
|
|
* more memory than we were willing to do. Therefore, a set of
|
|
* rtems-bsd-page routines track the allocation of pages and the
|
|
* small sections of source in the uma source were modified to use
|
|
* these methods on an rtems system.
|
|
*/
|
|
|
|
/*
|
|
* COPYRIGHT (c) 2012. On-Line Applications Research Corporation (OAR).
|
|
* 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 <freebsd/machine/rtems-bsd-config.h>
|
|
|
|
#include <freebsd/sys/types.h>
|
|
#include <freebsd/sys/systm.h>
|
|
#include <freebsd/sys/malloc.h>
|
|
#include <rtems/chain.h>
|
|
|
|
|
|
#define RTEMS_PAGE_COUNT 100
|
|
|
|
typedef struct {
|
|
rtems_chain_node node;
|
|
void *page;
|
|
void *end;
|
|
|
|
} rtems_page_t;
|
|
|
|
// chain of pages that have been allocated
|
|
static rtems_chain_control rtems_page_list = RTEMS_CHAIN_INITIALIZER_EMPTY( rtems_page_list );
|
|
|
|
void *
|
|
rtems_page_alloc(int bytes)
|
|
{
|
|
static void *p;
|
|
static rtems_page_t *page;
|
|
|
|
bytes = round_page(bytes);
|
|
p = (void *) malloc(bytes, M_TEMP, M_NOWAIT | M_ZERO);
|
|
|
|
page = (rtems_page_t *) malloc(sizeof(rtems_page_t), M_TEMP, M_NOWAIT | M_ZERO);
|
|
page->page = p;
|
|
page->end = p + bytes;
|
|
|
|
rtems_chain_append( &rtems_page_list, page );
|
|
|
|
return p;
|
|
}
|
|
|
|
rtems_page_t *rtems_page_t_find( void *address )
|
|
{
|
|
rtems_chain_node *the_node;
|
|
rtems_page_t *the_page = NULL;
|
|
|
|
for (the_node = rtems_chain_first( &rtems_page_list );
|
|
!rtems_chain_is_tail(&rtems_page_list, the_node);
|
|
the_node = rtems_chain_next(the_node)) {
|
|
the_page = the_node;
|
|
|
|
if ((address >= the_page->page) &&
|
|
(address <= the_page->end))
|
|
return the_page;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void *rtems_page_find( void *address )
|
|
{
|
|
rtems_page_t *ptr;
|
|
|
|
ptr = rtems_page_t_find( address );
|
|
|
|
if (ptr)
|
|
return ptr->page;
|
|
|
|
return ptr;
|
|
}
|
|
|
|
void rtems_page_free( void *address )
|
|
{
|
|
rtems_page_t *ptr;
|
|
|
|
ptr = rtems_page_t_find( address );
|
|
KASSERT(ptr != NULL, ("Unable to locate page for freed element"));
|
|
|
|
free( ptr->page, M_TEMP );
|
|
free( ptr, M_TEMP );
|
|
}
|