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1 | jermar | 1 | /* |
564 | jermar | 2 | * Copyright (C) 2001-2005 Jakub Jermar |
3 | * Copyright (C) 2005 Sergey Bondari |
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1 | jermar | 4 | * All rights reserved. |
5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
368 | jermar | 30 | #include <typedefs.h> |
1 | jermar | 31 | #include <arch/types.h> |
32 | #include <mm/heap.h> |
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33 | #include <mm/frame.h> |
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34 | #include <mm/vm.h> |
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35 | #include <panic.h> |
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367 | jermar | 36 | #include <debug.h> |
368 | jermar | 37 | #include <list.h> |
1 | jermar | 38 | #include <synch/spinlock.h> |
115 | jermar | 39 | #include <arch/asm.h> |
195 | vana | 40 | #include <arch.h> |
533 | bondari | 41 | #include <print.h> |
536 | bondari | 42 | #include <align.h> |
115 | jermar | 43 | |
623 | jermar | 44 | SPINLOCK_INITIALIZE(zone_head_lock); /**< this lock protects zone_head list */ |
624 | jermar | 45 | LIST_INITIALIZE(zone_head); /**< list of all zones in the system */ |
367 | jermar | 46 | |
539 | jermar | 47 | /** Blacklist containing non-available areas of memory. |
48 | * |
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49 | * This blacklist is used to exclude frames that cannot be allocated |
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50 | * (e.g. kernel memory) from available memory map. |
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51 | */ |
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533 | bondari | 52 | region_t zone_blacklist[ZONE_BLACKLIST_SIZE]; |
53 | count_t zone_blacklist_count = 0; |
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54 | |||
479 | bondari | 55 | static struct buddy_system_operations zone_buddy_system_operations = { |
56 | .find_buddy = zone_buddy_find_buddy, |
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57 | .bisect = zone_buddy_bisect, |
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58 | .coalesce = zone_buddy_coalesce, |
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59 | .set_order = zone_buddy_set_order, |
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60 | .get_order = zone_buddy_get_order, |
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533 | bondari | 61 | .mark_busy = zone_buddy_mark_busy, |
479 | bondari | 62 | }; |
63 | |||
368 | jermar | 64 | /** Initialize physical memory management |
65 | * |
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66 | * Initialize physical memory managemnt. |
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67 | */ |
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1 | jermar | 68 | void frame_init(void) |
69 | { |
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125 | jermar | 70 | if (config.cpu_active == 1) { |
537 | jermar | 71 | frame_region_not_free(KA2PA(config.base), config.kernel_size); |
1 | jermar | 72 | } |
73 | |||
74 | frame_arch_init(); |
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75 | } |
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76 | |||
537 | jermar | 77 | /** Allocate power-of-two frames of physical memory. |
368 | jermar | 78 | * |
79 | * @param flags Flags for host zone selection and address processing. |
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537 | jermar | 80 | * @param order Allocate exactly 2^order frames. |
368 | jermar | 81 | * |
82 | * @return Allocated frame. |
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1 | jermar | 83 | */ |
533 | bondari | 84 | __address frame_alloc(int flags, __u8 order) |
1 | jermar | 85 | { |
413 | jermar | 86 | ipl_t ipl; |
368 | jermar | 87 | link_t *cur, *tmp; |
88 | zone_t *z; |
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89 | zone_t *zone = NULL; |
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90 | frame_t *frame = NULL; |
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91 | __address v; |
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1 | jermar | 92 | |
93 | loop: |
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413 | jermar | 94 | ipl = interrupts_disable(); |
368 | jermar | 95 | spinlock_lock(&zone_head_lock); |
533 | bondari | 96 | |
368 | jermar | 97 | /* |
98 | * First, find suitable frame zone. |
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99 | */ |
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100 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
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101 | z = list_get_instance(cur, zone_t, link); |
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1 | jermar | 102 | |
368 | jermar | 103 | spinlock_lock(&z->lock); |
533 | bondari | 104 | |
105 | /* Check if the zone has 2^order frames area available */ |
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106 | if (buddy_system_can_alloc(z->buddy_system, order)) { |
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368 | jermar | 107 | zone = z; |
108 | break; |
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1 | jermar | 109 | } |
533 | bondari | 110 | |
368 | jermar | 111 | spinlock_unlock(&z->lock); |
1 | jermar | 112 | } |
368 | jermar | 113 | |
114 | if (!zone) { |
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115 | if (flags & FRAME_PANIC) |
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116 | panic("Can't allocate frame.\n"); |
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117 | |||
118 | /* |
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119 | * TODO: Sleep until frames are available again. |
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120 | */ |
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121 | spinlock_unlock(&zone_head_lock); |
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413 | jermar | 122 | interrupts_restore(ipl); |
1 | jermar | 123 | |
368 | jermar | 124 | panic("Sleep not implemented.\n"); |
125 | goto loop; |
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126 | } |
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1 | jermar | 127 | |
368 | jermar | 128 | |
533 | bondari | 129 | /* Allocate frames from zone buddy system */ |
539 | jermar | 130 | tmp = buddy_system_alloc(zone->buddy_system, order); |
1 | jermar | 131 | |
539 | jermar | 132 | ASSERT(tmp); |
533 | bondari | 133 | |
539 | jermar | 134 | /* Update zone information. */ |
135 | zone->free_count -= (1 << order); |
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136 | zone->busy_count += (1 << order); |
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137 | |||
138 | /* Frame will be actually a first frame of the block. */ |
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139 | frame = list_get_instance(tmp, frame_t, buddy_link); |
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140 | |||
533 | bondari | 141 | /* get frame address */ |
479 | bondari | 142 | v = FRAME2ADDR(zone, frame); |
533 | bondari | 143 | |
539 | jermar | 144 | spinlock_unlock(&zone->lock); |
145 | spinlock_unlock(&zone_head_lock); |
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146 | interrupts_restore(ipl); |
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147 | |||
148 | |||
368 | jermar | 149 | if (flags & FRAME_KA) |
150 | v = PA2KA(v); |
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151 | |||
152 | return v; |
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1 | jermar | 153 | } |
154 | |||
368 | jermar | 155 | /** Free a frame. |
156 | * |
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157 | * Find respective frame structrue for supplied addr. |
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158 | * Decrement frame reference count. |
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159 | * If it drops to zero, move the frame structure to free list. |
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160 | * |
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161 | * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE. |
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1 | jermar | 162 | */ |
163 | void frame_free(__address addr) |
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164 | { |
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413 | jermar | 165 | ipl_t ipl; |
368 | jermar | 166 | link_t *cur; |
167 | zone_t *z; |
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168 | zone_t *zone = NULL; |
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169 | frame_t *frame; |
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170 | ASSERT(addr % FRAME_SIZE == 0); |
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1 | jermar | 171 | |
413 | jermar | 172 | ipl = interrupts_disable(); |
368 | jermar | 173 | spinlock_lock(&zone_head_lock); |
1 | jermar | 174 | |
368 | jermar | 175 | /* |
176 | * First, find host frame zone for addr. |
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177 | */ |
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178 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
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179 | z = list_get_instance(cur, zone_t, link); |
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180 | |||
181 | spinlock_lock(&z->lock); |
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182 | |||
183 | if (IS_KA(addr)) |
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184 | addr = KA2PA(addr); |
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185 | |||
186 | /* |
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187 | * Check if addr belongs to z. |
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188 | */ |
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189 | if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) { |
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190 | zone = z; |
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191 | break; |
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1 | jermar | 192 | } |
368 | jermar | 193 | spinlock_unlock(&z->lock); |
1 | jermar | 194 | } |
195 | |||
368 | jermar | 196 | ASSERT(zone != NULL); |
197 | |||
479 | bondari | 198 | frame = ADDR2FRAME(zone, addr); |
533 | bondari | 199 | |
368 | jermar | 200 | ASSERT(frame->refcount); |
201 | |||
202 | if (!--frame->refcount) { |
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533 | bondari | 203 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
368 | jermar | 204 | } |
539 | jermar | 205 | |
206 | /* Update zone information. */ |
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207 | zone->free_count += (1 << frame->buddy_order); |
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208 | zone->busy_count -= (1 << frame->buddy_order); |
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368 | jermar | 209 | |
539 | jermar | 210 | spinlock_unlock(&zone->lock); |
368 | jermar | 211 | spinlock_unlock(&zone_head_lock); |
413 | jermar | 212 | interrupts_restore(ipl); |
1 | jermar | 213 | } |
214 | |||
368 | jermar | 215 | /** Mark frame region not free. |
216 | * |
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217 | * Mark frame region not free. |
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218 | * |
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537 | jermar | 219 | * @param base Base address of non-available region. |
220 | * @param size Size of non-available region. |
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368 | jermar | 221 | */ |
533 | bondari | 222 | void frame_region_not_free(__address base, size_t size) |
1 | jermar | 223 | { |
537 | jermar | 224 | index_t index; |
533 | bondari | 225 | index = zone_blacklist_count++; |
537 | jermar | 226 | |
227 | /* Force base to the nearest lower address frame boundary. */ |
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564 | jermar | 228 | base = ALIGN_DOWN(base, FRAME_SIZE); |
537 | jermar | 229 | /* Align size to frame boundary. */ |
564 | jermar | 230 | size = ALIGN_UP(size, FRAME_SIZE); |
537 | jermar | 231 | |
564 | jermar | 232 | ASSERT(index < ZONE_BLACKLIST_SIZE); |
533 | bondari | 233 | zone_blacklist[index].base = base; |
234 | zone_blacklist[index].size = size; |
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1 | jermar | 235 | } |
367 | jermar | 236 | |
539 | jermar | 237 | /** Create frame zones in region of available memory. |
238 | * |
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239 | * Avoid any black listed areas of non-available memory. |
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240 | * Assume that the black listed areas cannot overlap |
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241 | * one another or cross available memory region boundaries. |
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242 | * |
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243 | * @param base Base address of available memory region. |
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244 | * @param size Size of the region. |
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245 | */ |
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533 | bondari | 246 | void zone_create_in_region(__address base, size_t size) { |
247 | int i; |
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248 | zone_t * z; |
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537 | jermar | 249 | __address s; |
250 | size_t sz; |
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533 | bondari | 251 | |
252 | ASSERT(base % FRAME_SIZE == 0); |
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253 | ASSERT(size % FRAME_SIZE == 0); |
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254 | |||
537 | jermar | 255 | if (!size) |
256 | return; |
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257 | |||
533 | bondari | 258 | for (i = 0; i < zone_blacklist_count; i++) { |
259 | if (zone_blacklist[i].base >= base && zone_blacklist[i].base < base + size) { |
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260 | s = base; sz = zone_blacklist[i].base - base; |
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261 | ASSERT(base != s || sz != size); |
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262 | zone_create_in_region(s, sz); |
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263 | |||
264 | s = zone_blacklist[i].base + zone_blacklist[i].size; |
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265 | sz = (base + size) - (zone_blacklist[i].base + zone_blacklist[i].size); |
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266 | ASSERT(base != s || sz != size); |
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267 | zone_create_in_region(s, sz); |
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268 | return; |
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269 | |||
270 | } |
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271 | } |
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272 | |||
273 | z = zone_create(base, size, 0); |
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274 | |||
275 | if (!z) { |
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564 | jermar | 276 | panic("Cannot allocate zone (base=%P, size=%d).\n", base, size); |
533 | bondari | 277 | } |
278 | |||
279 | zone_attach(z); |
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280 | } |
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281 | |||
282 | |||
367 | jermar | 283 | /** Create frame zone |
284 | * |
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285 | * Create new frame zone. |
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286 | * |
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287 | * @param start Physical address of the first frame within the zone. |
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288 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
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289 | * @param flags Zone flags. |
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290 | * |
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291 | * @return Initialized zone. |
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292 | */ |
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533 | bondari | 293 | zone_t * zone_create(__address start, size_t size, int flags) |
367 | jermar | 294 | { |
295 | zone_t *z; |
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296 | count_t cnt; |
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297 | int i; |
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479 | bondari | 298 | __u8 max_order; |
533 | bondari | 299 | |
367 | jermar | 300 | ASSERT(start % FRAME_SIZE == 0); |
301 | ASSERT(size % FRAME_SIZE == 0); |
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302 | |||
303 | cnt = size / FRAME_SIZE; |
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304 | |||
374 | jermar | 305 | z = (zone_t *) early_malloc(sizeof(zone_t)); |
367 | jermar | 306 | if (z) { |
307 | link_initialize(&z->link); |
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552 | palkovsky | 308 | spinlock_initialize(&z->lock, "zone_lock"); |
367 | jermar | 309 | |
310 | z->base = start; |
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311 | z->flags = flags; |
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312 | |||
313 | z->free_count = cnt; |
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314 | z->busy_count = 0; |
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315 | |||
374 | jermar | 316 | z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t)); |
367 | jermar | 317 | if (!z->frames) { |
375 | jermar | 318 | early_free(z); |
367 | jermar | 319 | return NULL; |
320 | } |
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321 | |||
322 | for (i = 0; i<cnt; i++) { |
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323 | frame_initialize(&z->frames[i], z); |
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324 | } |
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325 | |||
479 | bondari | 326 | /* |
327 | * Create buddy system for the zone |
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328 | */ |
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537 | jermar | 329 | for (max_order = 0; cnt >> max_order; max_order++) |
330 | ; |
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489 | jermar | 331 | z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations, (void *) z); |
533 | bondari | 332 | |
333 | /* Stuffing frames */ |
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334 | for (i = 0; i<cnt; i++) { |
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335 | z->frames[i].refcount = 0; |
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336 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
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337 | } |
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367 | jermar | 338 | } |
339 | return z; |
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340 | } |
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341 | |||
342 | /** Attach frame zone |
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343 | * |
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344 | * Attach frame zone to zone list. |
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345 | * |
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346 | * @param zone Zone to be attached. |
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347 | */ |
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348 | void zone_attach(zone_t *zone) |
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349 | { |
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413 | jermar | 350 | ipl_t ipl; |
367 | jermar | 351 | |
413 | jermar | 352 | ipl = interrupts_disable(); |
367 | jermar | 353 | spinlock_lock(&zone_head_lock); |
354 | |||
355 | list_append(&zone->link, &zone_head); |
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356 | |||
357 | spinlock_unlock(&zone_head_lock); |
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413 | jermar | 358 | interrupts_restore(ipl); |
367 | jermar | 359 | } |
360 | |||
361 | /** Initialize frame structure |
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362 | * |
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363 | * Initialize frame structure. |
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364 | * |
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365 | * @param frame Frame structure to be initialized. |
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366 | * @param zone Host frame zone. |
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367 | */ |
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368 | void frame_initialize(frame_t *frame, zone_t *zone) |
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369 | { |
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533 | bondari | 370 | frame->refcount = 1; |
371 | frame->buddy_order = 0; |
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367 | jermar | 372 | } |
479 | bondari | 373 | |
374 | |||
375 | /** Buddy system find_buddy implementation |
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489 | jermar | 376 | * |
377 | * @param b Buddy system. |
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480 | bondari | 378 | * @param block Block for which buddy should be found |
479 | bondari | 379 | * |
480 | bondari | 380 | * @return Buddy for given block if found |
479 | bondari | 381 | */ |
489 | jermar | 382 | link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) { |
539 | jermar | 383 | frame_t * frame; |
480 | bondari | 384 | zone_t * zone; |
564 | jermar | 385 | index_t index; |
480 | bondari | 386 | bool is_left, is_right; |
479 | bondari | 387 | |
480 | bondari | 388 | frame = list_get_instance(block, frame_t, buddy_link); |
533 | bondari | 389 | zone = (zone_t *) b->data; |
480 | bondari | 390 | |
564 | jermar | 391 | ASSERT(IS_BUDDY_ORDER_OK(FRAME_INDEX(zone, frame), frame->buddy_order)); |
392 | |||
480 | bondari | 393 | is_left = IS_BUDDY_LEFT_BLOCK(zone, frame); |
564 | jermar | 394 | is_right = IS_BUDDY_RIGHT_BLOCK(zone, frame); |
480 | bondari | 395 | |
564 | jermar | 396 | ASSERT(is_left ^ is_right); |
397 | |||
533 | bondari | 398 | if (is_left) { |
399 | index = (FRAME_INDEX(zone, frame)) + (1 << frame->buddy_order); |
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615 | palkovsky | 400 | } else { // if (is_right) |
533 | bondari | 401 | index = (FRAME_INDEX(zone, frame)) - (1 << frame->buddy_order); |
402 | } |
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403 | |||
404 | if (FRAME_INDEX_VALID(zone, index)) { |
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405 | if ( zone->frames[index].buddy_order == frame->buddy_order && |
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406 | zone->frames[index].refcount == 0) { |
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407 | return &zone->frames[index].buddy_link; |
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480 | bondari | 408 | } |
409 | } |
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410 | |||
539 | jermar | 411 | return NULL; |
479 | bondari | 412 | } |
413 | |||
414 | /** Buddy system bisect implementation |
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415 | * |
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489 | jermar | 416 | * @param b Buddy system. |
480 | bondari | 417 | * @param block Block to bisect |
418 | * |
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419 | * @return right block |
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479 | bondari | 420 | */ |
489 | jermar | 421 | link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
480 | bondari | 422 | frame_t * frame_l, * frame_r; |
564 | jermar | 423 | |
480 | bondari | 424 | frame_l = list_get_instance(block, frame_t, buddy_link); |
533 | bondari | 425 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
564 | jermar | 426 | |
480 | bondari | 427 | return &frame_r->buddy_link; |
479 | bondari | 428 | } |
429 | |||
430 | /** Buddy system coalesce implementation |
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431 | * |
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489 | jermar | 432 | * @param b Buddy system. |
480 | bondari | 433 | * @param block_1 First block |
434 | * @param block_2 First block's buddy |
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435 | * |
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436 | * @return Coalesced block (actually block that represents lower address) |
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479 | bondari | 437 | */ |
489 | jermar | 438 | link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, link_t * block_2) { |
480 | bondari | 439 | frame_t * frame1, * frame2; |
564 | jermar | 440 | |
480 | bondari | 441 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
442 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
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564 | jermar | 443 | |
533 | bondari | 444 | return frame1 < frame2 ? block_1 : block_2; |
479 | bondari | 445 | } |
446 | |||
447 | /** Buddy system set_order implementation |
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489 | jermar | 448 | * |
449 | * @param b Buddy system. |
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480 | bondari | 450 | * @param block Buddy system block |
451 | * @param order Order to set |
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479 | bondari | 452 | */ |
489 | jermar | 453 | void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
480 | bondari | 454 | frame_t * frame; |
455 | frame = list_get_instance(block, frame_t, buddy_link); |
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456 | frame->buddy_order = order; |
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479 | bondari | 457 | } |
458 | |||
459 | /** Buddy system get_order implementation |
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489 | jermar | 460 | * |
461 | * @param b Buddy system. |
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480 | bondari | 462 | * @param block Buddy system block |
479 | bondari | 463 | * |
480 | bondari | 464 | * @return Order of block |
479 | bondari | 465 | */ |
489 | jermar | 466 | __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
480 | bondari | 467 | frame_t * frame; |
468 | frame = list_get_instance(block, frame_t, buddy_link); |
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469 | return frame->buddy_order; |
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479 | bondari | 470 | } |
533 | bondari | 471 | |
472 | /** Buddy system mark_busy implementation |
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473 | * |
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474 | * @param b Buddy system |
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475 | * @param block Buddy system block |
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476 | * |
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477 | */ |
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478 | void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
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479 | frame_t * frame; |
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480 | frame = list_get_instance(block, frame_t, buddy_link); |
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481 | frame->refcount = 1; |
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482 | } |