| 1 | /*
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| 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 |
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| 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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| 38 | #include <debug.h>
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| 39 | #include <memstr.h>
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| 40 |
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| 41 | __address bootstrap_dba;
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| 42 |
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| 43 | void page_arch_init(void)
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| 44 | {
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| 45 | __address dba;
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| 46 | __u32 i;
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| 47 |
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| 48 | if (config.cpu_active == 1) {
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| 49 | dba = frame_alloc(FRAME_KA | FRAME_PANIC);
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| 50 | memsetb(dba, PAGE_SIZE, 0);
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| 51 |
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| 52 | bootstrap_dba = dba;
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| 53 |
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| 54 | /*
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| 55 | * Identity mapping for all frames.
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| 56 | * PA2KA(identity) mapping for all frames.
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| 57 | */
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| 58 | for (i = 0; i < frames; i++) {
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| 59 | map_page_to_frame(i * PAGE_SIZE, i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
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| 60 | map_page_to_frame(PA2KA(i * PAGE_SIZE), i * PAGE_SIZE, PAGE_CACHEABLE, KA2PA(dba));
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| 61 | }
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| 62 |
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| 63 | trap_register(14, page_fault);
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| 64 | write_cr3(KA2PA(dba));
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| 65 | }
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| 66 | else {
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| 67 | /*
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| 68 | * Application processors need to create their own view of the
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| 69 | * virtual address space. Because of that, each AP copies
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| 70 | * already-initialized paging information from the bootstrap
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| 71 | * processor and adjusts it to fulfill its needs.
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| 72 | */
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| 73 |
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| 74 | dba = frame_alloc(FRAME_KA | FRAME_PANIC);
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| 75 | memcpy((void *)dba, (void *)bootstrap_dba , PAGE_SIZE);
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| 76 | write_cr3(KA2PA(dba));
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| 77 | }
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| 78 |
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| 79 | paging_on();
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| 80 | }
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