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("Cannot insert used space.");
 
    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 2132 → 3790

Rev 2132		Rev 3790
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	35	* @brief Backend for address space areas backed by continuous physical
36	* memory.	36	* memory.
37	*/	37	*/
38		38
39	#include <debug.h>	39	#include <debug.h>
40	#include <arch/types.h>	40	#include <arch/types.h>
41	#include <mm/as.h>	41	#include <mm/as.h>
42	#include <mm/frame.h>	42	#include <mm/frame.h>
43	#include <mm/slab.h>	43	#include <mm/slab.h>
44	#include <memstr.h>	44	#include <memstr.h>
45	#include <macros.h>	45	#include <macros.h>
46	#include <arch.h>	46	#include <arch.h>
47	#include <align.h>	47	#include <align.h>
48		48
49	static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access);	49	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);	50	static void phys_share(as_area_t *area);
51		51
52	mem_backend_t phys_backend = {	52	mem_backend_t phys_backend = {
53	.page_fault = phys_page_fault,	53	.page_fault = phys_page_fault,
54	.frame_free = NULL,	54	.frame_free = NULL,
55	.share = phys_share	55	.share = phys_share
56	};	56	};
57		57
58	/** 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.
59	*	59	*
60	* The address space area and page tables must be already locked.	60	* The address space area and page tables must be already locked.
61	*	61	*
62	* @param area Pointer to the address space area.	62	* @param area Pointer to the address space area.
63	* @param addr Faulting virtual address.	63	* @param addr Faulting virtual address.
64	* @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).
65	*	65	*
66	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e.	66	* @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e.
67	* serviced).	67	* serviced).
68	*/	68	*/
69	int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)	69	int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access)
70	{	70	{
71	uintptr_t base = area->backend_data.base;	71	uintptr_t base = area->backend_data.base;
72		72
73	if (!as_area_check_access(area, access))	73	if (!as_area_check_access(area, access))
74	return AS_PF_FAULT;	74	return AS_PF_FAULT;
75		75
76	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);	76	ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE);
77	page_mapping_insert(AS, addr, base + (addr - area->base),	77	page_mapping_insert(AS, addr, base + (addr - area->base),
78	as_area_get_flags(area));	78	as_area_get_flags(area));
79	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))	79	if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1))
80	panic("Could not insert used space.\n");	80	panic("Cannot insert used space.");
81		81
82	return AS_PF_OK;	82	return AS_PF_OK;
83	}	83	}
84		84
85	/** Share address space area backed by physical memory.	85	/** Share address space area backed by physical memory.
86	*	86	*
87	* Do actually nothing as sharing of address space areas	87	* Do actually nothing as sharing of address space areas
88	* that are backed up by physical memory is very easy.	88	* that are backed up by physical memory is very easy.
89	* Note that the function must be defined so that	89	* Note that the function must be defined so that
90	* as_area_share() will succeed.	90	* as_area_share() will succeed.
91	*/	91	*/
92	void phys_share(as_area_t *area)	92	void phys_share(as_area_t *area)
93	{	93	{
94	}	94	}
95		95
96	/** @}	96	/** @}
97	*/	97	*/
98		98