| 1 | /*
|
|---|
| 2 | * Copyright (c) 2001-2004 Jakub Jermar
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 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
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 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
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 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
|
|---|
| 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
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup ia32mm
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <arch/mm/page.h>
|
|---|
| 36 | #include <genarch/mm/page_pt.h>
|
|---|
| 37 | #include <arch/mm/frame.h>
|
|---|
| 38 | #include <mm/frame.h>
|
|---|
| 39 | #include <mm/page.h>
|
|---|
| 40 | #include <mm/as.h>
|
|---|
| 41 | #include <typedefs.h>
|
|---|
| 42 | #include <align.h>
|
|---|
| 43 | #include <config.h>
|
|---|
| 44 | #include <func.h>
|
|---|
| 45 | #include <arch/interrupt.h>
|
|---|
| 46 | #include <arch/asm.h>
|
|---|
| 47 | #include <debug.h>
|
|---|
| 48 | #include <memstr.h>
|
|---|
| 49 | #include <print.h>
|
|---|
| 50 | #include <interrupt.h>
|
|---|
| 51 |
|
|---|
| 52 | void page_arch_init(void)
|
|---|
| 53 | {
|
|---|
| 54 | uintptr_t cur;
|
|---|
| 55 | int flags;
|
|---|
| 56 |
|
|---|
| 57 | if (config.cpu_active == 1) {
|
|---|
| 58 | page_mapping_operations = &pt_mapping_operations;
|
|---|
| 59 |
|
|---|
| 60 | /*
|
|---|
| 61 | * PA2KA(identity) mapping for all frames until last_frame.
|
|---|
| 62 | */
|
|---|
| 63 | page_table_lock(AS_KERNEL, true);
|
|---|
| 64 | for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
|
|---|
| 65 | flags = PAGE_CACHEABLE | PAGE_WRITE;
|
|---|
| 66 | if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
|
|---|
| 67 | flags |= PAGE_GLOBAL;
|
|---|
| 68 | page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
|
|---|
| 69 | }
|
|---|
| 70 | page_table_unlock(AS_KERNEL, true);
|
|---|
| 71 |
|
|---|
| 72 | exc_register(14, "page_fault", true, (iroutine_t) page_fault);
|
|---|
| 73 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
|
|---|
| 74 | } else
|
|---|
| 75 | write_cr3((uintptr_t) AS_KERNEL->genarch.page_table);
|
|---|
| 76 |
|
|---|
| 77 | paging_on();
|
|---|
| 78 | }
|
|---|
| 79 |
|
|---|
| 80 |
|
|---|
| 81 | uintptr_t hw_map(uintptr_t physaddr, size_t size)
|
|---|
| 82 | {
|
|---|
| 83 | if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
|
|---|
| 84 | panic("Unable to map physical memory %p (%d bytes).", physaddr, size);
|
|---|
| 85 |
|
|---|
| 86 | uintptr_t virtaddr = PA2KA(last_frame);
|
|---|
| 87 | pfn_t i;
|
|---|
| 88 | page_table_lock(AS_KERNEL, true);
|
|---|
| 89 | for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) {
|
|---|
| 90 | uintptr_t addr = PFN2ADDR(i);
|
|---|
| 91 | page_mapping_insert(AS_KERNEL, virtaddr + addr, physaddr + addr, PAGE_NOT_CACHEABLE | PAGE_WRITE);
|
|---|
| 92 | }
|
|---|
| 93 | page_table_unlock(AS_KERNEL, true);
|
|---|
| 94 |
|
|---|
| 95 | last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
|
|---|
| 96 |
|
|---|
| 97 | return virtaddr;
|
|---|
| 98 | }
|
|---|
| 99 |
|
|---|
| 100 | void page_fault(unsigned int n __attribute__((unused)), istate_t *istate)
|
|---|
| 101 | {
|
|---|
| 102 | uintptr_t page;
|
|---|
| 103 | pf_access_t access;
|
|---|
| 104 |
|
|---|
| 105 | page = read_cr2();
|
|---|
| 106 |
|
|---|
| 107 | if (istate->error_word & PFERR_CODE_RSVD)
|
|---|
| 108 | panic("Reserved bit set in page directory.");
|
|---|
| 109 |
|
|---|
| 110 | if (istate->error_word & PFERR_CODE_RW)
|
|---|
| 111 | access = PF_ACCESS_WRITE;
|
|---|
| 112 | else
|
|---|
| 113 | access = PF_ACCESS_READ;
|
|---|
| 114 |
|
|---|
| 115 | if (as_page_fault(page, access, istate) == AS_PF_FAULT) {
|
|---|
| 116 | fault_if_from_uspace(istate, "Page fault: %#x.", page);
|
|---|
| 117 | panic_memtrap(istate, access, page, "Page fault.");
|
|---|
| 118 | }
|
|---|
| 119 | }
|
|---|
| 120 |
|
|---|
| 121 | /** @}
|
|---|
| 122 | */
|
|---|
