WebSVN – HelenOS – Diff – /trunk/kernel/generic/src/mm/backend_phys.c


/*
 * 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)
{
}
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/mm/backend_phys.c – Rev 2071 → 2089

Rev 2071		Rev 2089
1	/*	1	/*
2	* Copyright (c) 2006 Jakub Jermar	2	* Copyright (c) 2006 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup genericmm	29	/** @addtogroup genericmm
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Backend for address space areas backed by continuous physical memory.	35	* @brief Backend for address space areas backed by continuous physical memory.
36	*/	36	*/
37		37
38	#include <debug.h>	38	#include <debug.h>
39	#include <arch/types.h>	39	#include <arch/types.h>
40	#include <typedefs.h>	-
41	#include <mm/as.h>	40	#include <mm/as.h>
42	#include <mm/frame.h>	41	#include <mm/frame.h>
43	#include <mm/slab.h>	42	#include <mm/slab.h>
44	#include <memstr.h>	43	#include <memstr.h>
45	#include <macros.h>	44	#include <macros.h>
46	#include <arch.h>	45	#include <arch.h>
47	#include <align.h>	46	#include <align.h>
48		47
49	static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access);	48	static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access);
50	static void phys_share(as_area_t *area);	49	static void phys_share(as_area_t *area);
51		50
52	mem_backend_t phys_backend = {	51	mem_backend_t phys_backend = {
53	.page_fault = phys_page_fault,	52	.page_fault = phys_page_fault,
54	.frame_free = NULL,	53	.frame_free = NULL,
55	.share = phys_share	54	.share = phys_share
56	};	55	};
57		56
58	/** Service a page fault in the address space area backed by physical memory.	57	/** Service a page fault in the address space area backed by physical memory.
59	*	58	*
60	* The address space area and page tables must be already locked.	59	* The address space area and page tables must be already locked.
61	*	60	*
62	* @param area Pointer to the address space area.	61	* @param area Pointer to the address space area.
63	* @param addr Faulting virtual address.	62	* @param addr Faulting virtual address.
64	* @param access Access mode that caused the fault (i.e. read/write/exec).	63	* @param access Access mode that caused the fault (i.e. read/write/exec).
65	*	64	*
66	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).	65	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
67	*/	66	*/
68	int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)	67	int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
69	{	68	{
70	uintptr_t base = area->backend_data.base;	69	uintptr_t base = area->backend_data.base;
71		70
72	if (!as_area_check_access(area, access))	71	if (!as_area_check_access(area, access))
73	return AS_PF_FAULT;	72	return AS_PF_FAULT;
74		73
75	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);	74	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
76	page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));	75	page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));
77	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))	76	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
78	panic("Could not insert used space.\n");	77	panic("Could not insert used space.\n");
79		78
80	return AS_PF_OK;	79	return AS_PF_OK;
81	}	80	}
82		81
83	/** Share address space area backed by physical memory.	82	/** Share address space area backed by physical memory.
84	*	83	*
85	* Do actually nothing as sharing of address space areas	84	* Do actually nothing as sharing of address space areas
86	* that are backed up by physical memory is very easy.	85	* that are backed up by physical memory is very easy.
87	* Note that the function must be defined so that	86	* Note that the function must be defined so that
88	* as_area_share() will succeed.	87	* as_area_share() will succeed.
89	*/	88	*/
90	void phys_share(as_area_t *area)	89	void phys_share(as_area_t *area)
91	{	90	{
92	}	91	}
93		92
94	/** @}	93	/** @}
95	*/	94	*/
96		95