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https://git.rtems.org/rtems-libbsd/
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93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/**
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* @file
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*
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* @ingroup rtems_bsd_machine
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*
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* @brief TODO.
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*/
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/*
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* Copyright (c) 2015 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_
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#define _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_
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/*
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* A page is a fixed size memory area of size PAGE_SIZE with the ability to
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* associate an object with it. The memory pool for pages has a fixed size and
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* is allocated during system initialization. This API is intended to be used
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* by ZONE(9).
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <stdint.h>
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__BEGIN_DECLS
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extern void **rtems_bsd_page_object_table;
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extern uintptr_t rtems_bsd_page_area_begin;
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void *rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait);
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void rtems_bsd_page_free(void *addr);
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static inline void **
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rtems_bsd_page_get_object_entry(void *addr)
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{
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uintptr_t a = (uintptr_t)addr;
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uintptr_t b = rtems_bsd_page_area_begin;
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uintptr_t s = PAGE_SHIFT;
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return (&rtems_bsd_page_object_table[(a - b) >> s]);
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}
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static inline void *
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rtems_bsd_page_get_object(void *addr)
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{
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void **obj_entry = rtems_bsd_page_get_object_entry(addr);
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return (*obj_entry);
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}
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static inline void
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rtems_bsd_page_set_object(void *addr, void *obj)
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{
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void **obj_entry = rtems_bsd_page_get_object_entry(addr);
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*obj_entry = obj;
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}
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__END_DECLS
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#endif /* _RTEMS_BSD_MACHINE_RTEMS_BSD_PAGE_H_ */
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