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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <arch/types.h> |
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| 30 | #include <config.h> |
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| 31 | #include <func.h> |
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| 32 | #include <mm/frame.h> |
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| 33 | #include <mm/page.h> |
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| 34 | #include <arch/mm/page.h> |
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| 35 | #include <arch/interrupt.h> |
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| 36 | #include <arch/asm.h> |
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| 37 | #include <synch/spinlock.h> |
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| 106 | jermar | 38 | #include <debug.h> |
| 1 | jermar | 39 | |
| 40 | /* |
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| 41 | * Note. |
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| 11 | jermar | 42 | * This is the preliminary code for controlling paging mechanism on ia32. It is |
| 1 | jermar | 43 | * needed by other parts of the kernel for its ability to map virtual addresses |
| 44 | * to physical. SMP code relies on this feature. Other than that, this code is |
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| 45 | * by no means meant to implement virtual memory in terms of swapping pages in |
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| 46 | * and out. |
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| 47 | */ |
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| 48 | |||
| 49 | __address bootstrap_dba; |
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| 50 | |||
| 51 | void page_arch_init(void) |
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| 52 | { |
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| 53 | __address dba; |
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| 54 | __u32 i; |
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| 55 | |||
| 56 | if (config.cpu_active == 1) { |
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| 106 | jermar | 57 | dba = frame_alloc(FRAME_KA | FRAME_PANIC); |
| 1 | jermar | 58 | memsetb(dba, PAGE_SIZE, 0); |
| 125 | jermar | 59 | |
| 1 | jermar | 60 | bootstrap_dba = dba; |
| 61 | |||
| 62 | /* |
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| 116 | jermar | 63 | * Identity mapping for all frames. |
| 64 | * PA2KA(identity) mapping for all frames. |
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| 1 | jermar | 65 | */ |
| 116 | jermar | 66 | for (i = 0; i < frames; i++) { |
| 113 | jermar | 67 | map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba)); |
| 68 | map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba)); |
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| 105 | jermar | 69 | } |
| 1 | jermar | 70 | |
| 71 | trap_register(14, page_fault); |
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| 115 | jermar | 72 | write_cr3(KA2PA(dba)); |
| 1 | jermar | 73 | } |
| 74 | else { |
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| 75 | /* |
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| 76 | * Application processors need to create their own view of the |
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| 77 | * virtual address space. Because of that, each AP copies |
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| 78 | * already-initialized paging information from the bootstrap |
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| 79 | * processor and adjusts it to fulfill its needs. |
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| 80 | */ |
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| 81 | |||
| 82 | dba = frame_alloc(FRAME_KA | FRAME_PANIC); |
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| 83 | memcopy(bootstrap_dba, dba, PAGE_SIZE); |
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| 115 | jermar | 84 | write_cr3(KA2PA(dba)); |
| 1 | jermar | 85 | } |
| 86 | |||
| 87 | paging_on(); |
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| 88 | } |