| 0,0 → 1,131 |
|---|
| /* |
| * 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); |
| } |
| |
| /** @} |
| */ |