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978 jermar 1 
/*
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 * Copyright (c) 2006 Jakub Jermar
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 * All rights reserved.
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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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 *
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 * - 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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 * - 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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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup libc
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 * @{
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 */
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/** @file
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 */
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#include <as.h>
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#include <libc.h>
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#include <unistd.h>
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#include <align.h>
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#include <sys/types.h>
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#include <bitops.h>
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#include <malloc.h>
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/** Last position allocated by as_get_mappable_page */
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static uintptr_t last_allocated = 0;
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/** Create address space area.
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 *
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 * @param address Virtual address where to place new address space area.
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 * @param size    Size of the area.
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 * @param flags   Flags describing type of the area.
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 *
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 * @return address on success, (void *) -1 otherwise.
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 *
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 */
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void *as_area_create(void *address, size_t size, int flags)
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{
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    return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
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        (sysarg_t) size, (sysarg_t) flags);
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}
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/** Resize address space area.
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 *
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 * @param address Virtual address pointing into already existing address space
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 *                area.
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 * @param size    New requested size of the area.
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 * @param flags   Currently unused.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 */
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int as_area_resize(void *address, size_t size, int flags)
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{
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    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
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        (sysarg_t) size, (sysarg_t) flags);
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}
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/** Destroy address space area.
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 *
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 * @param address Virtual address pointing into the address space area being
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 *                destroyed.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 */
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int as_area_destroy(void *address)
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{
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    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
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}
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/** Change address-space area flags.
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 *
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 * @param address Virtual address pointing into the address space area being
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 *                modified.
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 * @param flags   New flags describing type of the area.
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 *
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 * @return zero on success or a code from @ref errno.h on failure.
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 *
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 */
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int as_area_change_flags(void *address, int flags)
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{
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    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
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        (sysarg_t) flags);
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}
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/** Return pointer to some unmapped area, where fits new as_area
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 *
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 * @param size Requested size of the allocation.
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 *
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 * @return pointer to the beginning
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 *
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 */
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void *as_get_mappable_page(size_t size)
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{
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    if (size == 0)
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        return NULL;
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    size_t sz = 1 << (fnzb(size - 1) + 1);
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    if (last_allocated == 0)
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        last_allocated = get_max_heap_addr();
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    /*
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     * Make sure we allocate from naturally aligned address.
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     */
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    uintptr_t res = ALIGN_UP(last_allocated, sz);
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    last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
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    return ((void *) res);
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}
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/** @}
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 */