Rev 3790 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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| 1424 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Jakub Jermar |
| 1424 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1757 | jermar | 29 | /** @addtogroup genericmm |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | |||
| 1424 | jermar | 33 | /** |
| 1702 | cejka | 34 | * @file |
| 2132 | jermar | 35 | * @brief Backend for address space areas backed by continuous physical |
| 36 | * memory. |
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| 1424 | jermar | 37 | */ |
| 38 | |||
| 39 | #include <debug.h> |
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| 40 | #include <arch/types.h> |
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| 41 | #include <mm/as.h> |
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| 42 | #include <mm/frame.h> |
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| 43 | #include <mm/slab.h> |
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| 44 | #include <memstr.h> |
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| 45 | #include <macros.h> |
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| 46 | #include <arch.h> |
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| 47 | #include <align.h> |
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| 48 | |||
| 1780 | jermar | 49 | static int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access); |
| 1424 | jermar | 50 | static void phys_share(as_area_t *area); |
| 51 | |||
| 52 | mem_backend_t phys_backend = { |
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| 53 | .page_fault = phys_page_fault, |
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| 54 | .frame_free = NULL, |
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| 55 | .share = phys_share |
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| 56 | }; |
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| 57 | |||
| 58 | /** Service a page fault in the address space area backed by physical memory. |
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| 59 | * |
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| 60 | * The address space area and page tables must be already locked. |
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| 61 | * |
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| 62 | * @param area Pointer to the address space area. |
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| 63 | * @param addr Faulting virtual address. |
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| 64 | * @param access Access mode that caused the fault (i.e. read/write/exec). |
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| 65 | * |
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| 2132 | jermar | 66 | * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. |
| 67 | * serviced). |
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| 1424 | jermar | 68 | */ |
| 1780 | jermar | 69 | int phys_page_fault(as_area_t *area, uintptr_t addr, pf_access_t access) |
| 1424 | jermar | 70 | { |
| 1780 | jermar | 71 | uintptr_t base = area->backend_data.base; |
| 1424 | jermar | 72 | |
| 73 | if (!as_area_check_access(area, access)) |
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| 74 | return AS_PF_FAULT; |
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| 75 | |||
| 1539 | cejka | 76 | ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE); |
| 2132 | jermar | 77 | page_mapping_insert(AS, addr, base + (addr - area->base), |
| 78 | as_area_get_flags(area)); |
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| 1424 | jermar | 79 | if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
| 3790 | svoboda | 80 | panic("Cannot insert used space."); |
| 1424 | jermar | 81 | |
| 82 | return AS_PF_OK; |
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| 83 | } |
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| 84 | |||
| 85 | /** Share address space area backed by physical memory. |
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| 86 | * |
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| 87 | * Do actually nothing as sharing of address space areas |
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| 88 | * that are backed up by physical memory is very easy. |
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| 89 | * Note that the function must be defined so that |
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| 90 | * as_area_share() will succeed. |
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| 91 | */ |
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| 92 | void phys_share(as_area_t *area) |
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| 93 | { |
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| 94 | } |
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| 1702 | cejka | 95 | |
| 1757 | jermar | 96 | /** @} |
| 1702 | cejka | 97 | */ |