| 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 | /** @addtogroup kernel_amd64_mm
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <arch/mm/page.h>
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| 36 | #include <genarch/mm/page_pt.h>
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| 37 | #include <arch/mm/frame.h>
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| 38 | #include <mm/page.h>
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| 39 | #include <mm/frame.h>
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| 40 | #include <mm/as.h>
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| 41 | #include <arch/asm.h>
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| 42 | #include <config.h>
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| 43 | #include <interrupt.h>
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| 44 | #include <panic.h>
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| 45 | #include <align.h>
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| 46 | #include <macros.h>
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| 47 |
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| 48 | void page_arch_init(void)
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| 49 | {
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| 50 | if (config.cpu_active > 1) {
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| 51 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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| 52 | return;
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| 53 | }
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| 54 |
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| 55 | uintptr_t cur;
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| 56 | unsigned int identity_flags =
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| 57 | PAGE_GLOBAL | PAGE_CACHEABLE | PAGE_EXEC | PAGE_WRITE | PAGE_READ;
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| 58 |
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| 59 | page_mapping_operations = &pt_mapping_operations;
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| 60 |
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| 61 | page_table_lock(AS_KERNEL, true);
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| 62 |
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| 63 | /*
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| 64 | * PA2KA(identity) mapping for all low-memory frames.
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| 65 | */
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| 66 | for (cur = 0; cur < min(config.identity_size, config.physmem_end);
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| 67 | cur += FRAME_SIZE)
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| 68 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, identity_flags);
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| 69 |
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| 70 | page_table_unlock(AS_KERNEL, true);
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| 71 |
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| 72 | exc_register(VECTOR_PF, "page_fault", true, (iroutine_t) page_fault);
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| 73 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
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| 74 | }
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| 75 |
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| 76 | void page_fault(unsigned int n, istate_t *istate)
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| 77 | {
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| 78 | uintptr_t badvaddr = read_cr2();
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| 79 |
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| 80 | if (istate->error_word & PFERR_CODE_RSVD)
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| 81 | panic("Reserved bit set in page table entry.");
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| 82 |
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| 83 | pf_access_t access;
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| 84 |
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| 85 | if (istate->error_word & PFERR_CODE_RW)
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| 86 | access = PF_ACCESS_WRITE;
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| 87 | else if (istate->error_word & PFERR_CODE_ID)
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| 88 | access = PF_ACCESS_EXEC;
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| 89 | else
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| 90 | access = PF_ACCESS_READ;
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| 91 |
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| 92 | (void) as_page_fault(badvaddr, access, istate);
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| 93 | }
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| 94 |
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| 95 | /** @}
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| 96 | */
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