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| Rev | Author | Line No. | Line |
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| 756 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 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 <genarch/mm/page_pt.h> |
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| 30 | #include <mm/page.h> |
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| 31 | #include <mm/frame.h> |
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| 32 | #include <mm/as.h> |
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| 33 | #include <arch/mm/page.h> |
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| 34 | #include <arch/mm/as.h> |
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| 35 | #include <arch/types.h> |
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| 36 | #include <typedefs.h> |
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| 37 | #include <memstr.h> |
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| 38 | #include <arch.h> |
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| 39 | |||
| 40 | static pte_t *ptl0_create(int flags); |
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| 41 | |||
| 1044 | jermar | 42 | static void pt_lock(as_t *as, bool lock); |
| 43 | static void pt_unlock(as_t *as, bool unlock); |
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| 44 | |||
| 756 | jermar | 45 | as_operations_t as_pt_operations = { |
| 1044 | jermar | 46 | .page_table_create = ptl0_create, |
| 47 | .page_table_lock = pt_lock, |
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| 48 | .page_table_unlock = pt_unlock |
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| 756 | jermar | 49 | }; |
| 50 | |||
| 51 | /** Create PTL0. |
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| 52 | * |
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| 53 | * PTL0 of 4-level page table will be created for each address space. |
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| 54 | * |
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| 55 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
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| 56 | * |
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| 57 | * @return New PTL0. |
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| 58 | */ |
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| 59 | pte_t *ptl0_create(int flags) |
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| 60 | { |
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| 61 | pte_t *src_ptl0, *dst_ptl0; |
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| 62 | ipl_t ipl; |
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| 63 | |||
| 814 | palkovsky | 64 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
| 756 | jermar | 65 | |
| 66 | if (flags & FLAG_AS_KERNEL) { |
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| 67 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
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| 68 | } else { |
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| 1059 | jermar | 69 | __address src, dst; |
| 70 | |||
| 756 | jermar | 71 | /* |
| 72 | * Copy the kernel address space portion to new PTL0. |
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| 73 | */ |
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| 74 | |||
| 75 | ipl = interrupts_disable(); |
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| 1059 | jermar | 76 | spinlock_lock(&AS_KERNEL->lock); |
| 756 | jermar | 77 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
| 1059 | jermar | 78 | |
| 79 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
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| 80 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
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| 81 | |||
| 82 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
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| 83 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
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| 756 | jermar | 84 | spinlock_unlock(&AS_KERNEL->lock); |
| 85 | interrupts_restore(ipl); |
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| 86 | } |
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| 87 | |||
| 88 | return (pte_t *) KA2PA((__address) dst_ptl0); |
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| 89 | } |
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| 1044 | jermar | 90 | |
| 91 | /** Lock page tables. |
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| 92 | * |
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| 93 | * Lock only the address space. |
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| 94 | * Interrupts must be disabled. |
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| 95 | * |
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| 96 | * @param as Address space. |
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| 97 | * @param lock If false, do not attempt to lock the address space. |
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| 98 | */ |
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| 99 | void pt_lock(as_t *as, bool lock) |
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| 100 | { |
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| 101 | if (lock) |
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| 102 | spinlock_lock(&as->lock); |
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| 103 | } |
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| 104 | |||
| 105 | /** Unlock page tables. |
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| 106 | * |
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| 107 | * Unlock the address space. |
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| 108 | * Interrupts must be disabled. |
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| 109 | * |
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| 110 | * @param as Address space. |
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| 111 | * @param unlock If false, do not attempt to unlock the address space. |
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| 112 | */ |
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| 113 | void pt_unlock(as_t *as, bool unlock) |
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| 114 | { |
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| 115 | if (unlock) |
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| 116 | spinlock_unlock(&as->lock); |
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| 117 | } |