| 1 | /*
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| 2 | * Copyright (c) 2009 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 arm32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @brief Kernel part of Restartable Atomic Sequences support.
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| 34 | */
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| 35 |
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| 36 | #include <arch/ras.h>
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| 37 | #include <mm/mm.h>
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| 38 | #include <mm/frame.h>
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| 39 | #include <mm/page.h>
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| 40 | #include <mm/km.h>
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| 41 | #include <mm/tlb.h>
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| 42 | #include <mm/asid.h>
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| 43 | #include <interrupt.h>
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| 44 | #include <arch/exception.h>
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| 45 | #include <arch.h>
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| 46 | #include <mem.h>
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| 47 | #include <typedefs.h>
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| 48 |
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| 49 | uintptr_t *ras_page = NULL;
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| 50 |
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| 51 | void ras_init(void)
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| 52 | {
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| 53 | uintptr_t frame =
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| 54 | frame_alloc(1, FRAME_ATOMIC | FRAME_HIGHMEM, 0);
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| 55 | if (!frame)
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| 56 | frame = frame_alloc(1, FRAME_LOWMEM, 0);
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| 57 |
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| 58 | ras_page = (uintptr_t *) km_map(frame,
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| 59 | PAGE_SIZE, PAGE_READ | PAGE_WRITE | PAGE_USER | PAGE_CACHEABLE);
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| 60 |
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| 61 | memsetb(ras_page, PAGE_SIZE, 0);
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| 62 | ras_page[RAS_START] = 0;
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| 63 | ras_page[RAS_END] = 0xffffffff;
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| 64 | }
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| 65 |
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| 66 | void ras_check(unsigned int n, istate_t *istate)
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| 67 | {
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| 68 | bool restart_needed = false;
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| 69 | uintptr_t restart_pc = 0;
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| 70 |
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| 71 | if (istate_from_uspace(istate)) {
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| 72 | if (ras_page[RAS_START]) {
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| 73 | if ((ras_page[RAS_START] < istate->pc) &&
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| 74 | (ras_page[RAS_END] > istate->pc)) {
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| 75 | restart_needed = true;
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| 76 | restart_pc = ras_page[RAS_START];
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| 77 | }
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| 78 | ras_page[RAS_START] = 0;
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| 79 | ras_page[RAS_END] = 0xffffffff;
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | exc_dispatch(n, istate);
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| 84 | if (restart_needed)
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| 85 | istate->pc = restart_pc;
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| 86 | }
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| 87 |
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| 88 | /** @}
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| 89 | */
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