diff options
author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-01-27 08:26:53 +0100 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2015-01-29 08:51:43 +0100 |
commit | 3c302b62fda9e429b8796b1f244fd70568bb3fb5 (patch) | |
tree | de05c96aba163b633ad171a644842f0235ec1440 /rtemsbsd/include/machine | |
parent | Map bcopy() and bzero() via macros (diff) | |
download | rtems-libbsd-3c302b62fda9e429b8796b1f244fd70568bb3fb5.tar.bz2 |
Add a simple page allocator
Diffstat (limited to 'rtemsbsd/include/machine')
-rw-r--r-- | rtemsbsd/include/machine/rtems-bsd-page.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/rtemsbsd/include/machine/rtems-bsd-page.h b/rtemsbsd/include/machine/rtems-bsd-page.h new file mode 100644 index 00000000..b732c1a9 --- /dev/null +++ b/rtemsbsd/include/machine/rtems-bsd-page.h @@ -0,0 +1,92 @@ +/** + * @file + * + * @ingroup rtems_bsd_machine + * + * @brief TODO. + */ + +/* + * Copyright (c) 2015 embedded brains GmbH. All rights reserved. + * + * embedded brains GmbH + * Dornierstr. 4 + * 82178 Puchheim + * Germany + * <rtems@embedded-brains.de> + * + * 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. + */ + +#ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ +#define _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ + +/* + * A page is a fixed size memory area of size PAGE_SIZE with the ability to + * associate an object with it. The memory pool for pages has a fixed size and + * is allocated during system initialization. This API is intended to be used + * by ZONE(9). + */ + +#include <sys/cdefs.h> +#include <sys/param.h> +#include <stdint.h> + +__BEGIN_DECLS + +extern void **rtems_bsd_page_object_table; + +extern uintptr_t rtems_bsd_page_area_begin; + +void *rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait); + +void rtems_bsd_page_free(void *addr); + +static inline void ** +rtems_bsd_page_get_object_entry(void *addr) +{ + uintptr_t a = (uintptr_t)addr; + uintptr_t b = rtems_bsd_page_area_begin; + uintptr_t s = PAGE_SHIFT; + + return (&rtems_bsd_page_object_table[(a - b) >> s]); +} + +static inline void * +rtems_bsd_page_get_object(void *addr) +{ + void **obj_entry = rtems_bsd_page_get_object_entry(addr); + + return (*obj_entry); +} + +static inline void +rtems_bsd_page_set_object(void *addr, void *obj) +{ + void **obj_entry = rtems_bsd_page_get_object_entry(addr); + + *obj_entry = obj; +} + +__END_DECLS + +#endif /* _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ */ |