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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 | |||
| 1266 | jermar | 29 | /** |
| 30 | * @file as_pt.c |
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| 31 | * @brief Address space functions for 4-level hierarchical pagetables. |
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| 32 | */ |
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| 33 | |||
| 756 | jermar | 34 | #include <genarch/mm/page_pt.h> |
| 35 | #include <mm/page.h> |
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| 36 | #include <mm/frame.h> |
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| 37 | #include <mm/as.h> |
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| 38 | #include <arch/mm/page.h> |
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| 39 | #include <arch/mm/as.h> |
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| 40 | #include <arch/types.h> |
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| 41 | #include <typedefs.h> |
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| 42 | #include <memstr.h> |
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| 43 | #include <arch.h> |
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| 44 | |||
| 45 | static pte_t *ptl0_create(int flags); |
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| 46 | |||
| 1044 | jermar | 47 | static void pt_lock(as_t *as, bool lock); |
| 48 | static void pt_unlock(as_t *as, bool unlock); |
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| 49 | |||
| 756 | jermar | 50 | as_operations_t as_pt_operations = { |
| 1044 | jermar | 51 | .page_table_create = ptl0_create, |
| 52 | .page_table_lock = pt_lock, |
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| 53 | .page_table_unlock = pt_unlock |
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| 756 | jermar | 54 | }; |
| 55 | |||
| 56 | /** Create PTL0. |
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| 57 | * |
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| 58 | * PTL0 of 4-level page table will be created for each address space. |
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| 59 | * |
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| 60 | * @param flags Flags can specify whether ptl0 is for the kernel address space. |
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| 61 | * |
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| 62 | * @return New PTL0. |
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| 63 | */ |
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| 64 | pte_t *ptl0_create(int flags) |
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| 65 | { |
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| 66 | pte_t *src_ptl0, *dst_ptl0; |
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| 67 | ipl_t ipl; |
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| 68 | |||
| 814 | palkovsky | 69 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC))); |
| 756 | jermar | 70 | |
| 71 | if (flags & FLAG_AS_KERNEL) { |
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| 72 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
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| 73 | } else { |
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| 1059 | jermar | 74 | __address src, dst; |
| 75 | |||
| 756 | jermar | 76 | /* |
| 77 | * Copy the kernel address space portion to new PTL0. |
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| 78 | */ |
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| 79 | |||
| 80 | ipl = interrupts_disable(); |
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| 1059 | jermar | 81 | spinlock_lock(&AS_KERNEL->lock); |
| 756 | jermar | 82 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table); |
| 1059 | jermar | 83 | |
| 84 | src = (__address) &src_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
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| 85 | dst = (__address) &dst_ptl0[PTL0_INDEX(KERNEL_ADDRESS_SPACE_START)]; |
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| 86 | |||
| 87 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0); |
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| 88 | memcpy((void *) dst, (void *) src, PAGE_SIZE - (src - (__address) src_ptl0)); |
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| 756 | jermar | 89 | spinlock_unlock(&AS_KERNEL->lock); |
| 90 | interrupts_restore(ipl); |
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| 91 | } |
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| 92 | |||
| 93 | return (pte_t *) KA2PA((__address) dst_ptl0); |
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| 94 | } |
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| 1044 | jermar | 95 | |
| 96 | /** Lock page tables. |
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| 97 | * |
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| 98 | * Lock only the address space. |
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| 99 | * Interrupts must be disabled. |
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| 100 | * |
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| 101 | * @param as Address space. |
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| 102 | * @param lock If false, do not attempt to lock the address space. |
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| 103 | */ |
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| 104 | void pt_lock(as_t *as, bool lock) |
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| 105 | { |
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| 106 | if (lock) |
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| 107 | spinlock_lock(&as->lock); |
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| 108 | } |
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| 109 | |||
| 110 | /** Unlock page tables. |
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| 111 | * |
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| 112 | * Unlock the address space. |
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| 113 | * Interrupts must be disabled. |
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| 114 | * |
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| 115 | * @param as Address space. |
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| 116 | * @param unlock If false, do not attempt to unlock the address space. |
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| 117 | */ |
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| 118 | void pt_unlock(as_t *as, bool unlock) |
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| 119 | { |
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| 120 | if (unlock) |
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| 121 | spinlock_unlock(&as->lock); |
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| 122 | } |