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) |
{ |
} |
|
/** @} |
*/ |