1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_bsd_rtems |
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5 | * |
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6 | * @brief TODO. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2015 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * Redistribution and use in source and binary forms, with or without |
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19 | * modification, are permitted provided that the following conditions |
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20 | * are met: |
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21 | * 1. Redistributions of source code must retain the above copyright |
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22 | * notice, this list of conditions and the following disclaimer. |
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23 | * 2. Redistributions in binary form must reproduce the above copyright |
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24 | * notice, this list of conditions and the following disclaimer in the |
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25 | * documentation and/or other materials provided with the distribution. |
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26 | * |
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27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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37 | * SUCH DAMAGE. |
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38 | */ |
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39 | |
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40 | #include <machine/rtems-bsd-kernel-space.h> |
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41 | #include <machine/rtems-bsd-page.h> |
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42 | |
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43 | #include <rtems/bsd/sys/param.h> |
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44 | #include <rtems/bsd/sys/types.h> |
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45 | #include <rtems/bsd/sys/lock.h> |
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46 | #include <sys/mutex.h> |
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47 | #include <sys/systm.h> |
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48 | #include <sys/kernel.h> |
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49 | #include <vm/uma.h> |
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50 | |
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51 | #include <stdlib.h> |
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52 | |
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53 | #include <rtems/malloc.h> |
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54 | #include <rtems/rbheap.h> |
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55 | |
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56 | /* FIXME: This must be application configurable */ |
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57 | #define PAGE_HEAP_SIZE (8 * 1024 * 1024) |
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58 | |
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59 | void **rtems_bsd_page_object_table; |
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60 | |
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61 | uintptr_t rtems_bsd_page_area_begin; |
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62 | |
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63 | static rtems_rbheap_control page_heap; |
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64 | |
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65 | struct mtx page_heap_mtx; |
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66 | |
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67 | void * |
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68 | rtems_bsd_page_alloc(uintptr_t size_in_bytes, int wait) |
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69 | { |
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70 | void *addr; |
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71 | |
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72 | mtx_lock(&page_heap_mtx); |
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73 | |
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74 | addr = rtems_rbheap_allocate(&page_heap, size_in_bytes); |
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75 | if (addr == NULL && wait) { |
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76 | int i; |
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77 | |
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78 | for (i = 0; i < 8; i++) { |
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79 | mtx_unlock(&page_heap_mtx); |
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80 | uma_reclaim(); |
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81 | mtx_lock(&page_heap_mtx); |
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82 | |
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83 | addr = rtems_rbheap_allocate(&page_heap, size_in_bytes); |
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84 | if (addr != NULL) |
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85 | break; |
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86 | |
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87 | msleep(&page_heap, &page_heap_mtx, 0, |
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88 | "page alloc", (hz / 4) * (i + 1)); |
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89 | } |
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90 | |
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91 | if (i == 8) { |
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92 | panic("rtems_bsd_page_alloc: page starvation"); |
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93 | } |
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94 | } |
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95 | |
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96 | mtx_unlock(&page_heap_mtx); |
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97 | |
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98 | return (addr); |
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99 | } |
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100 | |
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101 | void |
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102 | rtems_bsd_page_free(void *addr) |
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103 | { |
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104 | mtx_lock(&page_heap_mtx); |
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105 | rtems_rbheap_free(&page_heap, addr); |
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106 | wakeup(&page_heap); |
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107 | mtx_unlock(&page_heap_mtx); |
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108 | } |
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109 | |
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110 | static void |
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111 | rtems_bsd_page_init(void *arg) |
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112 | { |
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113 | rtems_status_code sc; |
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114 | void *area; |
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115 | void **obj_table; |
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116 | rtems_rbheap_chunk *chunks; |
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117 | size_t i; |
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118 | size_t n; |
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119 | |
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120 | mtx_init(&page_heap_mtx, "page heap", NULL, MTX_DEF); |
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121 | |
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122 | area = rtems_heap_allocate_aligned_with_boundary(PAGE_HEAP_SIZE, |
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123 | PAGE_SIZE, 0); |
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124 | BSD_ASSERT(area != NULL); |
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125 | |
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126 | sc = rtems_rbheap_initialize(&page_heap, area, PAGE_HEAP_SIZE, |
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127 | PAGE_SIZE, rtems_rbheap_extend_descriptors_with_malloc, NULL); |
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128 | BSD_ASSERT(sc == RTEMS_SUCCESSFUL); |
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129 | |
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130 | rtems_rbheap_set_extend_descriptors(&page_heap, |
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131 | rtems_rbheap_extend_descriptors_never); |
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132 | |
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133 | n = PAGE_HEAP_SIZE / PAGE_SIZE; |
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134 | |
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135 | chunks = malloc(n * sizeof(*chunks), M_RTEMS_HEAP, M_NOWAIT); |
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136 | BSD_ASSERT(chunks != NULL); |
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137 | |
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138 | for (i = 0; i < n; ++i) { |
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139 | rtems_rbheap_add_to_spare_descriptor_chain(&page_heap, |
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140 | &chunks[i]); |
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141 | } |
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142 | |
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143 | obj_table = calloc(n, sizeof(*obj_table)); |
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144 | |
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145 | rtems_bsd_page_area_begin = (uintptr_t)area; |
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146 | rtems_bsd_page_object_table = obj_table; |
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147 | } |
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148 | |
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149 | SYSINIT(rtems_bsd_page, SI_SUB_VM, SI_ORDER_FIRST, rtems_bsd_page_init, NULL); |
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