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1 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 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 | |||
29 | #include <arch/types.h> |
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30 | #include <func.h> |
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31 | |||
32 | #include <mm/heap.h> |
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33 | #include <mm/frame.h> |
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34 | #include <mm/page.h> |
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35 | #include <mm/vm.h> |
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36 | #include <arch/mm/page.h> |
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37 | |||
38 | #include <config.h> |
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39 | #include <memstr.h> |
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40 | |||
41 | #include <panic.h> |
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42 | |||
43 | #include <synch/spinlock.h> |
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44 | |||
45 | __u32 frames; |
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46 | __u32 frames_free; |
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47 | |||
48 | __u8 *frame_bitmap; |
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49 | __u32 frame_bitmap_octets; |
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50 | |||
51 | /* |
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52 | * This is for kernel address space frames (allocated with FRAME_KA). |
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53 | * Their addresses may not interfere with user address space. |
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54 | */ |
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55 | __u8 *frame_kernel_bitmap; |
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56 | __u32 kernel_frames; |
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57 | __u32 kernel_frames_free; |
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58 | |||
59 | static spinlock_t framelock; |
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60 | |||
61 | void frame_init(void) |
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62 | { |
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63 | if (config.cpu_active == 1) { |
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64 | |||
65 | /* |
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66 | * The bootstrap processor will allocate all necessary memory for frame allocation. |
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67 | */ |
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68 | |||
69 | frames = config.memory_size / FRAME_SIZE; |
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70 | frame_bitmap_octets = frames / 8 + (frames % 8 > 0); |
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71 | |||
72 | frame_bitmap = (__u8 *) malloc(frame_bitmap_octets); |
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73 | if (!frame_bitmap) |
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68 | decky | 74 | panic("malloc/frame_bitmap\n"); |
1 | jermar | 75 | |
76 | /* |
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77 | * Mark all frames free. |
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78 | */ |
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79 | memsetb((__address) frame_bitmap, frame_bitmap_octets, 0); |
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80 | frames_free = frames; |
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81 | |||
82 | /* |
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83 | * Will be properly set up by architecture dependent frame init. |
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84 | */ |
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85 | frame_kernel_bitmap = NULL; |
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86 | kernel_frames_free = 0; |
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87 | kernel_frames = 0; |
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88 | } |
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89 | |||
90 | /* |
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91 | * No frame allocations/reservations prior this point. |
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92 | */ |
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93 | |||
94 | frame_arch_init(); |
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95 | |||
96 | if (config.cpu_active == 1) { |
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97 | /* |
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98 | * Create the memory address space map. Marked frames and frame |
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99 | * regions cannot be used for allocation. |
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100 | */ |
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101 | frame_region_not_free(config.base, config.base + config.kernel_size); |
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102 | } |
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103 | } |
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104 | |||
105 | /* |
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106 | * Allocate a frame. |
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107 | */ |
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108 | __address frame_alloc(int flags) |
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109 | { |
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110 | int i; |
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111 | pri_t pri; |
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112 | __u8 **frame_bitmap_ptr = &frame_bitmap; |
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113 | __u32 *frames_ptr = &frames, *frames_free_ptr = &frames_free; |
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114 | |||
115 | if (flags & FRAME_KA) { |
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116 | frame_bitmap_ptr = &frame_kernel_bitmap; |
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117 | frames_ptr = &kernel_frames; |
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118 | frames_free_ptr = &kernel_frames_free; |
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119 | } |
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120 | |||
121 | loop: |
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122 | pri = cpu_priority_high(); |
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123 | spinlock_lock(&framelock); |
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124 | if (*frames_free_ptr) { |
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125 | for (i=0; i < *frames_ptr; i++) { |
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126 | int m, n; |
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127 | |||
128 | m = i / 8; |
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129 | n = i % 8; |
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130 | |||
131 | if (((*frame_bitmap_ptr)[m] & (1<<n)) == 0) { |
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132 | (*frame_bitmap_ptr)[m] |= (1<<n); |
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133 | *frames_free_ptr--; |
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134 | if (flags & FRAME_KA) { |
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135 | /* |
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136 | * frames_free_ptr points to kernel_frames_free |
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137 | * It is still necessary to decrement frames_free. |
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138 | */ |
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139 | frames_free--; |
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140 | } |
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141 | spinlock_unlock(&framelock); |
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142 | cpu_priority_restore(pri); |
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143 | if (flags & FRAME_KA) return PA2KA(i*FRAME_SIZE); |
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144 | return i*FRAME_SIZE; |
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145 | } |
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146 | } |
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68 | decky | 147 | panic("frames_free inconsistent (%d)\n", frames_free); |
1 | jermar | 148 | } |
149 | spinlock_unlock(&framelock); |
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150 | cpu_priority_restore(pri); |
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151 | |||
152 | if (flags & FRAME_PANIC) |
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68 | decky | 153 | panic("unable to allocate frame\n"); |
1 | jermar | 154 | |
155 | /* TODO: implement sleeping logic here */ |
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68 | decky | 156 | panic("sleep not supported\n"); |
1 | jermar | 157 | |
158 | goto loop; |
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159 | } |
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160 | |||
161 | /* |
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162 | * Free a frame. |
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163 | */ |
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164 | void frame_free(__address addr) |
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165 | { |
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166 | pri_t pri; |
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167 | __u32 frame; |
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168 | __u32 *frames_free_ptr = &frames_free, *frames_ptr = &frames; |
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169 | __u8 **frame_bitmap_ptr = &frame_bitmap; |
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170 | |||
171 | if (IS_KA(addr)) { |
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172 | frames_free_ptr = &kernel_frames_free; |
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173 | frame_bitmap_ptr = &frame_kernel_bitmap; |
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174 | } |
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175 | |||
176 | pri = cpu_priority_high(); |
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177 | spinlock_lock(&framelock); |
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178 | |||
179 | frame = IS_KA(addr) ? KA2PA(addr) : addr; |
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180 | frame /= FRAME_SIZE; |
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181 | if (frame < *frames_ptr) { |
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182 | int m, n; |
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183 | |||
184 | m = frame / 8; |
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185 | n = frame % 8; |
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186 | |||
187 | if ((*frame_bitmap_ptr)[m] & (1<<n)) { |
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188 | (*frame_bitmap_ptr)[m] &= ~(1<<n); |
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189 | *frames_free_ptr++; |
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190 | if (IS_KA(addr)) { |
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191 | /* |
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192 | * frames_free_ptr points to kernel_frames_free |
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193 | * It is still necessary to increment frames_free. |
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194 | */ |
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195 | frames_free++; |
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196 | } |
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197 | } |
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68 | decky | 198 | else panic("frame_free: frame already free\n"); |
1 | jermar | 199 | } |
68 | decky | 200 | else panic("frame_free: frame number too big\n"); |
1 | jermar | 201 | |
202 | spinlock_unlock(&framelock); |
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203 | cpu_priority_restore(pri); |
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204 | } |
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205 | |||
206 | /* |
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207 | * Don't use this function for normal allocation. Use frame_alloc() instead. |
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208 | * Use this function to declare that some special frame is not free. |
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209 | */ |
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210 | void frame_not_free(__address addr) |
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211 | { |
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212 | pri_t pri; |
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213 | __u32 frame; |
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214 | __u32 *frames_ptr = &frames, *frames_free_ptr = &frames_free; |
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215 | __u8 **frame_bitmap_ptr = &frame_bitmap; |
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216 | |||
217 | pri = cpu_priority_high(); |
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218 | spinlock_lock(&framelock); |
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219 | frame = IS_KA(addr) ? KA2PA(addr) : addr; |
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220 | frame /= FRAME_SIZE; |
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221 | if (frame < *frames_ptr) { |
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222 | int m, n; |
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223 | |||
224 | m = frame / 8; |
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225 | n = frame % 8; |
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226 | |||
227 | if (((*frame_bitmap_ptr)[m] & (1<<n)) == 0) { |
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228 | (*frame_bitmap_ptr)[m] |= (1<<n); |
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229 | *frames_free_ptr--; |
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230 | if (IS_KA(addr)) { |
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231 | /* |
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232 | * frames_free_ptr points to kernel_frames_free |
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233 | * It is still necessary to decrement frames_free. |
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234 | */ |
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235 | frames_free--; |
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236 | } |
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237 | } |
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238 | } |
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239 | spinlock_unlock(&framelock); |
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240 | cpu_priority_restore(pri); |
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241 | } |
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242 | |||
243 | void frame_region_not_free(__address start, __address stop) |
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244 | { |
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245 | __u32 i; |
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246 | |||
247 | start /= FRAME_SIZE; |
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248 | stop /= FRAME_SIZE; |
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249 | for (i = start; i <= stop; i++) |
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250 | frame_not_free(i * FRAME_SIZE); |
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251 | } |