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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 | 29 | ||
30 | /** @addtogroup arm32boot |
30 | /** @addtogroup arm32boot |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** @file |
33 | /** @file |
34 | */ |
34 | */ |
35 | 35 | ||
36 | 36 | ||
37 | #include "mm.h" |
37 | #include "mm.h" |
38 | 38 | ||
39 | 39 | ||
40 | /** Initializes "section" page table entry. |
40 | /** Initializes "section" page table entry. |
41 | * |
41 | * |
42 | * Will be readable/writable by kernel with no access from user mode. |
42 | * Will be readable/writable by kernel with no access from user mode. |
43 | * Will belong to domain 0. No cache or buffering is enabled. |
43 | * Will belong to domain 0. No cache or buffering is enabled. |
44 | * |
44 | * |
45 | * @param pte Section entry to initialize. |
45 | * @param pte Section entry to initialize. |
46 | * @param frame First frame in the section (frame number). |
46 | * @param frame First frame in the section (frame number). |
47 | * |
47 | * |
48 | * @note If #frame is not 1MB aligned, first lower 1MB aligned frame will be used. |
48 | * @note If #frame is not 1MB aligned, first lower 1MB aligned frame will be used. |
49 | */ |
49 | */ |
50 | static void init_pte_level0_section(pte_level0_section_t* pte, unsigned frame) |
50 | static void init_pte_level0_section(pte_level0_section_t* pte, unsigned int frame) |
51 | { |
51 | { |
52 | pte->descriptor_type = PTE_DESCRIPTOR_SECTION; |
52 | pte->descriptor_type = PTE_DESCRIPTOR_SECTION; |
53 | pte->bufferable = 0; |
53 | pte->bufferable = 0; |
54 | pte->cacheable = 0; |
54 | pte->cacheable = 0; |
55 | pte->impl_specific = 0; |
55 | pte->impl_specific = 0; |
56 | pte->domain = 0; |
56 | pte->domain = 0; |
57 | pte->should_be_zero_1 = 0; |
57 | pte->should_be_zero_1 = 0; |
58 | pte->access_permission = PTE_AP_USER_NO_KERNEL_RW; |
58 | pte->access_permission = PTE_AP_USER_NO_KERNEL_RW; |
59 | pte->should_be_zero_2 = 0; |
59 | pte->should_be_zero_2 = 0; |
60 | pte->section_base_addr = (frame << FRAME_WIDTH) >> 20; |
60 | pte->section_base_addr = frame; |
61 | } |
61 | } |
62 | 62 | ||
63 | 63 | ||
64 | /** Initializes page table used while booting the kernel. */ |
64 | /** Initializes page table used while booting the kernel. */ |
65 | static void init_page_table(void) |
65 | static void init_page_table(void) |
66 | { |
66 | { |
67 | int i; |
67 | int i; |
68 | const unsigned int first_kernel_section = ADDR2PFN(PA2KA(0)) / FRAMES_PER_SECTION; |
68 | const unsigned int first_kernel_page = ADDR2PFN(PA2KA(0)); |
69 | 69 | ||
70 | // create 1:1 virtual-physical mapping (in lower 2GB) |
70 | // create 1:1 virtual-physical mapping (in lower 2GB) |
71 | for (i = 0; i < first_kernel_section; i++) { |
71 | for (i = 0; i < first_kernel_page; i++) { |
72 | init_pte_level0_section(&page_table[i], i * FRAMES_PER_SECTION); |
72 | init_pte_level0_section(&page_table[i], i); |
73 | } |
73 | } |
74 | 74 | ||
75 | // create 1:1 virtual-physical mapping in kernel space (upper 2GB), |
75 | // create 1:1 virtual-physical mapping in kernel space (upper 2GB), |
76 | // physical addresses start from 0 |
76 | // physical addresses start from 0 |
77 | for (i = first_kernel_section; i < PTL0_ENTRIES; i++) { |
77 | for (i = first_kernel_page; i < PTL0_ENTRIES; i++) { |
78 | init_pte_level0_section(&page_table[i], (i - first_kernel_section) * FRAMES_PER_SECTION); |
78 | init_pte_level0_section(&page_table[i], i - first_kernel_page); |
79 | } |
79 | } |
80 | } |
80 | } |
81 | 81 | ||
82 | 82 | ||
83 | /** Starts the MMU - initializes page table and enables paging. |
83 | /** Starts the MMU - initializes page table and enables paging. |
84 | */ |
84 | */ |
85 | void mmu_start() { |
85 | void mmu_start() { |
86 | init_page_table(); |
86 | init_page_table(); |
87 | set_ptl0_address(page_table); |
87 | set_ptl0_address(page_table); |
88 | enable_paging(); |
88 | enable_paging(); |
89 | } |
89 | } |
90 | 90 | ||
91 | 91 | ||
92 | /** @} |
92 | /** @} |
93 | */ |
93 | */ |
94 | 94 | ||
95 | 95 |