| 1 | /*
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| 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 |
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| 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 |
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| 40 | static pte_t *ptl0_create(int flags);
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| 41 |
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| 42 | as_operations_t as_pt_operations = {
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| 43 | .page_table_create = ptl0_create
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| 44 | };
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| 45 |
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| 46 | /** Create PTL0.
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| 47 | *
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| 48 | * PTL0 of 4-level page table will be created for each address space.
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| 49 | *
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| 50 | * @param flags Flags can specify whether ptl0 is for the kernel address space.
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| 51 | *
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| 52 | * @return New PTL0.
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| 53 | */
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| 54 | pte_t *ptl0_create(int flags)
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| 55 | {
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| 56 | pte_t *src_ptl0, *dst_ptl0;
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| 57 | ipl_t ipl;
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| 58 |
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| 59 | dst_ptl0 = (pte_t *) PA2KA(PFN2ADDR(frame_alloc(ONE_FRAME, FRAME_KA | FRAME_PANIC)));
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| 60 |
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| 61 | if (flags & FLAG_AS_KERNEL) {
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| 62 | memsetb((__address) dst_ptl0, PAGE_SIZE, 0);
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| 63 | } else {
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| 64 | /*
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| 65 | * Copy the kernel address space portion to new PTL0.
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| 66 | * TODO: copy only kernel address space.
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| 67 | */
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| 68 |
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| 69 | ipl = interrupts_disable();
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| 70 | spinlock_lock(&AS_KERNEL->lock);
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| 71 | src_ptl0 = (pte_t *) PA2KA((__address) AS_KERNEL->page_table);
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| 72 | memcpy((void *) dst_ptl0,(void *) src_ptl0, PAGE_SIZE);
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| 73 | spinlock_unlock(&AS_KERNEL->lock);
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| 74 | interrupts_restore(ipl);
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| 75 | }
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| 76 |
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| 77 | return (pte_t *) KA2PA((__address) dst_ptl0);
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| 78 | }
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