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