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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
2 | * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
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 arm32mm |
29 | /** @addtogroup arm32mm |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Paging related functions. |
33 | * @brief Paging related functions. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <arch/mm/page.h> |
36 | #include <arch/mm/page.h> |
37 | #include <genarch/mm/page_pt.h> |
37 | #include <genarch/mm/page_pt.h> |
38 | #include <mm/page.h> |
38 | #include <mm/page.h> |
39 | #include <align.h> |
39 | #include <align.h> |
40 | #include <config.h> |
40 | #include <config.h> |
41 | #include <arch/exception.h> |
41 | #include <arch/exception.h> |
42 | #include <typedefs.h> |
42 | #include <typedefs.h> |
43 | #include <arch/types.h> |
43 | #include <arch/types.h> |
44 | #include <interrupt.h> |
44 | #include <interrupt.h> |
45 | #include <arch/mm/frame.h> |
45 | #include <arch/mm/frame.h> |
46 | 46 | ||
47 | /** Initializes page tables. |
47 | /** Initializes page tables. |
48 | * |
48 | * |
49 | * 1:1 virtual-physical mapping is created in kernel address space. Mapping |
49 | * 1:1 virtual-physical mapping is created in kernel address space. Mapping |
50 | * for table with exception vectors is also created. |
50 | * for table with exception vectors is also created. |
51 | */ |
51 | */ |
52 | void page_arch_init(void) |
52 | void page_arch_init(void) |
53 | { |
53 | { |
54 | int flags = PAGE_CACHEABLE; |
54 | int flags = PAGE_CACHEABLE; |
55 | page_mapping_operations = &pt_mapping_operations; |
55 | page_mapping_operations = &pt_mapping_operations; |
56 | 56 | ||
57 | uintptr_t cur; |
57 | uintptr_t cur; |
58 | /* Kernel identity mapping */ |
58 | /* Kernel identity mapping */ |
59 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) |
59 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) |
60 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
60 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
61 | 61 | ||
62 | /* Create mapping for exception table at high offset */ |
62 | /* Create mapping for exception table at high offset */ |
63 | #ifdef HIGH_EXCEPTION_VECTORS |
63 | #ifdef HIGH_EXCEPTION_VECTORS |
64 | void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA); |
64 | void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA); |
65 | page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags); |
65 | page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags); |
66 | #else |
66 | #else |
67 | #error "Only high exception vector supported now" |
67 | #error "Only high exception vector supported now" |
68 | #endif |
68 | #endif |
69 | 69 | ||
70 | as_switch(NULL, AS_KERNEL); |
70 | as_switch(NULL, AS_KERNEL); |
71 | 71 | ||
72 | boot_page_table_free(); |
72 | boot_page_table_free(); |
73 | } |
73 | } |
74 | 74 | ||
75 | /** Maps device into the kernel space. |
75 | /** Maps device into the kernel space. |
76 | * |
76 | * |
77 | * Maps physical address of device into kernel virtual address space (so it can |
77 | * Maps physical address of device into kernel virtual address space (so it can |
78 | * be accessed only by kernel through virtual address). |
78 | * be accessed only by kernel through virtual address). |
79 | * |
79 | * |
80 | * @param physaddr Physical address where device is connected. |
80 | * @param physaddr Physical address where device is connected. |
81 | * @param size Length of area where device is present. |
81 | * @param size Length of area where device is present. |
82 | * |
82 | * |
83 | * @return Virtual address where device will be accessible. |
83 | * @return Virtual address where device will be accessible. |
84 | */ |
84 | */ |
85 | uintptr_t hw_map(uintptr_t physaddr, size_t size) |
85 | uintptr_t hw_map(uintptr_t physaddr, size_t size) |
86 | { |
86 | { |
87 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > |
87 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > |
88 | KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) { |
88 | KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) { |
89 | panic("Unable to map physical memory %p (%d bytes).", |
89 | panic("Unable to map physical memory %p (%d bytes).", |
90 | physaddr, size) |
90 | physaddr, size) |
91 | } |
91 | } |
92 | 92 | ||
93 | uintptr_t virtaddr = PA2KA(last_frame); |
93 | uintptr_t virtaddr = PA2KA(last_frame); |
94 | pfn_t i; |
94 | pfn_t i; |
95 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) { |
95 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) { |
96 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), |
96 | page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), |
97 | physaddr + PFN2ADDR(i), |
97 | physaddr + PFN2ADDR(i), |
98 | PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL); |
98 | PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL); |
99 | } |
99 | } |
100 | 100 | ||
101 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
101 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
102 | return virtaddr; |
102 | return virtaddr; |
103 | } |
103 | } |
104 | 104 | ||
105 | /** @} |
105 | /** @} |
106 | */ |
106 | */ |
107 | 107 |