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1424 | 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 | |||
1702 | cejka | 29 | /** @addtogroup genericmm |
30 | * @{ |
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31 | */ |
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32 | |||
1424 | jermar | 33 | /** |
1702 | cejka | 34 | * @file |
1424 | jermar | 35 | * @brief Backend for address space areas backed by continuous physical memory. |
36 | */ |
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37 | |||
38 | #include <debug.h> |
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39 | #include <arch/types.h> |
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40 | #include <typedefs.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 | |||
49 | static int phys_page_fault(as_area_t *area, __address addr, pf_access_t access); |
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50 | static void phys_share(as_area_t *area); |
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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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66 | * @return AS_PF_FAULT on failure (i.e. page fault) or AS_PF_OK on success (i.e. serviced). |
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67 | */ |
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68 | int phys_page_fault(as_area_t *area, __address addr, pf_access_t access) |
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69 | { |
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1425 | jermar | 70 | __address base = area->backend_data.base; |
1424 | jermar | 71 | |
72 | if (!as_area_check_access(area, access)) |
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73 | return AS_PF_FAULT; |
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74 | |||
1539 | cejka | 75 | ASSERT(addr - area->base < area->backend_data.frames * FRAME_SIZE); |
1424 | jermar | 76 | page_mapping_insert(AS, addr, base + (addr - area->base), as_area_get_flags(area)); |
77 | if (!used_space_insert(area, ALIGN_DOWN(addr, PAGE_SIZE), 1)) |
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78 | panic("Could not insert used space.\n"); |
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79 | |||
80 | return AS_PF_OK; |
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81 | } |
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82 | |||
83 | /** Share address space area backed by physical memory. |
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84 | * |
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85 | * Do actually nothing as sharing of address space areas |
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86 | * that are backed up by physical memory is very easy. |
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87 | * Note that the function must be defined so that |
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88 | * as_area_share() will succeed. |
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89 | */ |
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90 | void phys_share(as_area_t *area) |
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91 | { |
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92 | } |
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1702 | cejka | 93 | |
94 | /** @} |
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95 | */ |
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96 |