WebSVN – HelenOS-historic – Diff – /kernel/trunk/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 <typedefs.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, __address 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, __address addr, pf_access_t access)
{
    __address 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-historic

(root)/kernel/trunk/generic/src/mm/backend_phys.c – Rev 1539 → 1702

Rev 1539		Rev 1702
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
-		30	* @{
-		31	*/
-		32
29	/**	33	/**
30	* @file backend_elf.c	34	* @file
31	* @brief Backend for address space areas backed by continuous physical memory.	35	* @brief Backend for address space areas backed by continuous physical memory.
32	*/	36	*/
33		37
34	#include <debug.h>	38	#include <debug.h>
35	#include <arch/types.h>	39	#include <arch/types.h>
36	#include <typedefs.h>	40	#include <typedefs.h>
37	#include <mm/as.h>	41	#include <mm/as.h>
38	#include <mm/frame.h>	42	#include <mm/frame.h>
39	#include <mm/slab.h>	43	#include <mm/slab.h>
40	#include <memstr.h>	44	#include <memstr.h>
41	#include <macros.h>	45	#include <macros.h>
42	#include <arch.h>	46	#include <arch.h>
43	#include <align.h>	47	#include <align.h>
44		48
45	static int phys_page_fault(as_area_t *area, __address addr, pf_access_t access);	49	static int phys_page_fault(as_area_t *area, __address addr, pf_access_t access);
46	static void phys_share(as_area_t *area);	50	static void phys_share(as_area_t *area);
47		51
48	mem_backend_t phys_backend = {	52	mem_backend_t phys_backend = {
49	.page_fault = phys_page_fault,	53	.page_fault = phys_page_fault,
50	.frame_free = NULL,	54	.frame_free = NULL,
51	.share = phys_share	55	.share = phys_share
52	};	56	};
53		57
54	/** Service a page fault in the address space area backed by physical memory.	58	/** Service a page fault in the address space area backed by physical memory.
55	*	59	*
56	* The address space area and page tables must be already locked.	60	* The address space area and page tables must be already locked.
57	*	61	*
58	* @param area Pointer to the address space area.	62	* @param area Pointer to the address space area.
59	* @param addr Faulting virtual address.	63	* @param addr Faulting virtual address.
60	* @param access Access mode that caused the fault (i.e. read/write/exec).	64	* @param access Access mode that caused the fault (i.e. read/write/exec).
61	*	65	*
62	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).	66	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced).
63	*/	67	*/
64	int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)	68	int phys_page_fault(as_area_t *area, __address addr, pf_access_t access)
65	{	69	{
66	__address base = area->backend_data.base;	70	__address base = area->backend_data.base;
67		71
68	if (!as_area_check_access(area, access))	72	if (!as_area_check_access(area, access))
69	return AS_PF_FAULT;	73	return AS_PF_FAULT;
70		74
71	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);	75	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
72	page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));	76	page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area));
73	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))	77	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
74	panic("Could not insert used space.\n");	78	panic("Could not insert used space.\n");
75		79
76	return AS_PF_OK;	80	return AS_PF_OK;
77	}	81	}
78		82
79	/** Share address space area backed by physical memory.	83	/** Share address space area backed by physical memory.
80	*	84	*
81	* Do actually nothing as sharing of address space areas	85	* Do actually nothing as sharing of address space areas
82	* that are backed up by physical memory is very easy.	86	* that are backed up by physical memory is very easy.
83	* Note that the function must be defined so that	87	* Note that the function must be defined so that
84	* as_area_share() will succeed.	88	* as_area_share() will succeed.
85	*/	89	*/
86	void phys_share(as_area_t *area)	90	void phys_share(as_area_t *area)
87	{	91	{
88	}	92	}
-		93
-		94	/** @}
-		95	*/
-		96
89		97