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Diffstat (limited to 'rtemsbsd/rtems/rtems-bsd-page.c')
-rw-r--r-- | rtemsbsd/rtems/rtems-bsd-page.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/rtemsbsd/rtems/rtems-bsd-page.c b/rtemsbsd/rtems/rtems-bsd-page.c new file mode 100644 index 00000000..2a807178 --- /dev/null +++ b/rtemsbsd/rtems/rtems-bsd-page.c @@ -0,0 +1,116 @@ +/** + * @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 ); +} |