/*
* Copyright (c) 2006 Jakub Jermar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/** @addtogroup libc
* @{
*/
/** @file
*/
#include <as.h>
#include <libc.h>
#include <unistd.h>
#include <align.h>
#include <sys/types.h>
#include <bitops.h>
#include <malloc.h>
/** Last position allocated by as_get_mappable_page */
static uintptr_t last_allocated = 0;
/** Create address space area.
*
* @param address Virtual address where to place new address space area.
* @param size Size of the area.
* @param flags Flags describing type of the area.
*
* @return address on success, (void *) -1 otherwise.
*
*/
void *as_area_create(void *address, size_t size, int flags)
{
return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
(sysarg_t) size, (sysarg_t) flags);
}
/** Resize address space area.
*
* @param address Virtual address pointing into already existing address space
* area.
* @param size New requested size of the area.
* @param flags Currently unused.
*
* @return zero on success or a code from @ref errno.h on failure.
*
*/
int as_area_resize(void *address, size_t size, int flags)
{
return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
(sysarg_t) size, (sysarg_t) flags);
}
/** Destroy address space area.
*
* @param address Virtual address pointing into the address space area being
* destroyed.
*
* @return zero on success or a code from @ref errno.h on failure.
*
*/
int as_area_destroy(void *address)
{
return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
}
/** Change address-space area flags.
*
* @param address Virtual address pointing into the address space area being
* modified.
* @param flags New flags describing type of the area.
*
* @return zero on success or a code from @ref errno.h on failure.
*
*/
int as_area_change_flags(void *address, int flags)
{
return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
(sysarg_t) flags);
}
/** Return pointer to some unmapped area, where fits new as_area
*
* @param size Requested size of the allocation.
*
* @return pointer to the beginning
*
*/
void *as_get_mappable_page(size_t size)
{
if (size == 0)
return NULL;
size_t sz = 1 << (fnzb(size - 1) + 1);
if (last_allocated == 0)
last_allocated = get_max_heap_addr();
/*
* Make sure we allocate from naturally aligned address.
*/
uintptr_t res = ALIGN_UP(last_allocated, sz);
last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
return ((void *) res);
}
/** @}
*/