| 0,0 → 1,97 |
|---|
| /* |
| * 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 genericmm |
| * @{ |
| */ |
| |
| /** |
| * @file |
| * @brief Backend for address space areas backed by continuous physical |
| * memory. |
| */ |
| |
| #include <debug.h> |
| #include <arch/types.h> |
| #include <mm/as.h> |
| #include <mm/frame.h> |
| #include <mm/slab.h> |
| #include <memstr.h> |
| #include <macros.h> |
| #include <arch.h> |
| #include <align.h> |
| |
| static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access); |
| static void phys_share(as_area_t *area); |
| |
| mem_backend_t phys_backend = { |
| .page_fault = phys_page_fault, |
| .frame_free = NULL, |
| .share = phys_share |
| }; |
| |
| /** Service a page fault in the address space area backed by physical memory. |
| * |
| * The address space area and page tables must be already locked. |
| * |
| * @param area Pointer to the address space area. |
| * @param addr Faulting virtual address. |
| * @param access Access mode that caused the fault (i.e. read/write/exec). |
| * |
| * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. |
| * serviced). |
| */ |
| int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access) |
| { |
| uintptr_t base = area->backend_data.base; |
| |
| if (!as_area_check_access(area, access)) |
| return AS_PF_FAULT; |
| |
| ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE); |
| page_mapping_insert(AS, addr, base + (addr - area->base), |
| as_area_get_flags(area)); |
| if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
| panic("Could not insert used space.\n"); |
| |
| return AS_PF_OK; |
| } |
| |
| /** Share address space area backed by physical memory. |
| * |
| * Do actually nothing as sharing of address space areas |
| * that are backed up by physical memory is very easy. |
| * Note that the function must be defined so that |
| * as_area_share() will succeed. |
| */ |
| void phys_share(as_area_t *area) |
| { |
| } |
| |
| /** @} |
| */ |