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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 | |
367 | jermar | 44 | spinlock_t zone_head_lock; /**< this lock protects zone_head list */ |
45 | link_t zone_head; /**< list of all zones in the system */ |
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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) { |
367 | jermar | 71 | zone_init(); |
537 | jermar | 72 | frame_region_not_free(KA2PA(config.base), config.kernel_size); |
1 | jermar | 73 | } |
74 | |||
75 | frame_arch_init(); |
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76 | } |
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77 | |||
537 | jermar | 78 | /** Allocate power-of-two frames of physical memory. |
368 | jermar | 79 | * |
80 | * @param flags Flags for host zone selection and address processing. |
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537 | jermar | 81 | * @param order Allocate exactly 2^order frames. |
368 | jermar | 82 | * |
83 | * @return Allocated frame. |
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1 | jermar | 84 | */ |
533 | bondari | 85 | __address frame_alloc(int flags, __u8 order) |
1 | jermar | 86 | { |
413 | jermar | 87 | ipl_t ipl; |
368 | jermar | 88 | link_t *cur, *tmp; |
89 | zone_t *z; |
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90 | zone_t *zone = NULL; |
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91 | frame_t *frame = NULL; |
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92 | __address v; |
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1 | jermar | 93 | |
94 | loop: |
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413 | jermar | 95 | ipl = interrupts_disable(); |
368 | jermar | 96 | spinlock_lock(&zone_head_lock); |
533 | bondari | 97 | |
368 | jermar | 98 | /* |
99 | * First, find suitable frame zone. |
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100 | */ |
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101 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
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102 | z = list_get_instance(cur, zone_t, link); |
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1 | jermar | 103 | |
368 | jermar | 104 | spinlock_lock(&z->lock); |
533 | bondari | 105 | |
106 | /* Check if the zone has 2^order frames area available */ |
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107 | if (buddy_system_can_alloc(z->buddy_system, order)) { |
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368 | jermar | 108 | zone = z; |
109 | break; |
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1 | jermar | 110 | } |
533 | bondari | 111 | |
368 | jermar | 112 | spinlock_unlock(&z->lock); |
1 | jermar | 113 | } |
368 | jermar | 114 | |
115 | if (!zone) { |
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116 | if (flags & FRAME_PANIC) |
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117 | panic("Can't allocate frame.\n"); |
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118 | |||
119 | /* |
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120 | * TODO: Sleep until frames are available again. |
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121 | */ |
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122 | spinlock_unlock(&zone_head_lock); |
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413 | jermar | 123 | interrupts_restore(ipl); |
1 | jermar | 124 | |
368 | jermar | 125 | panic("Sleep not implemented.\n"); |
126 | goto loop; |
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127 | } |
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1 | jermar | 128 | |
368 | jermar | 129 | |
533 | bondari | 130 | /* Allocate frames from zone buddy system */ |
539 | jermar | 131 | tmp = buddy_system_alloc(zone->buddy_system, order); |
1 | jermar | 132 | |
539 | jermar | 133 | ASSERT(tmp); |
533 | bondari | 134 | |
539 | jermar | 135 | /* Update zone information. */ |
136 | zone->free_count -= (1 << order); |
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137 | zone->busy_count += (1 << order); |
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138 | |||
139 | /* Frame will be actually a first frame of the block. */ |
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140 | frame = list_get_instance(tmp, frame_t, buddy_link); |
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141 | |||
533 | bondari | 142 | /* get frame address */ |
479 | bondari | 143 | v = FRAME2ADDR(zone, frame); |
533 | bondari | 144 | |
539 | jermar | 145 | spinlock_unlock(&zone->lock); |
146 | spinlock_unlock(&zone_head_lock); |
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147 | interrupts_restore(ipl); |
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148 | |||
149 | |||
368 | jermar | 150 | if (flags & FRAME_KA) |
151 | v = PA2KA(v); |
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152 | |||
153 | return v; |
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1 | jermar | 154 | } |
155 | |||
368 | jermar | 156 | /** Free a frame. |
157 | * |
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158 | * Find respective frame structrue for supplied addr. |
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159 | * Decrement frame reference count. |
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160 | * If it drops to zero, move the frame structure to free list. |
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161 | * |
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162 | * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE. |
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1 | jermar | 163 | */ |
164 | void frame_free(__address addr) |
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165 | { |
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413 | jermar | 166 | ipl_t ipl; |
368 | jermar | 167 | link_t *cur; |
168 | zone_t *z; |
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169 | zone_t *zone = NULL; |
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170 | frame_t *frame; |
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171 | ASSERT(addr % FRAME_SIZE == 0); |
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1 | jermar | 172 | |
413 | jermar | 173 | ipl = interrupts_disable(); |
368 | jermar | 174 | spinlock_lock(&zone_head_lock); |
1 | jermar | 175 | |
368 | jermar | 176 | /* |
177 | * First, find host frame zone for addr. |
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178 | */ |
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179 | for (cur = zone_head.next; cur != &zone_head; cur = cur->next) { |
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180 | z = list_get_instance(cur, zone_t, link); |
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181 | |||
182 | spinlock_lock(&z->lock); |
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183 | |||
184 | if (IS_KA(addr)) |
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185 | addr = KA2PA(addr); |
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186 | |||
187 | /* |
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188 | * Check if addr belongs to z. |
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189 | */ |
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190 | if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) { |
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191 | zone = z; |
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192 | break; |
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1 | jermar | 193 | } |
368 | jermar | 194 | spinlock_unlock(&z->lock); |
1 | jermar | 195 | } |
196 | |||
368 | jermar | 197 | ASSERT(zone != NULL); |
198 | |||
479 | bondari | 199 | frame = ADDR2FRAME(zone, addr); |
533 | bondari | 200 | |
368 | jermar | 201 | ASSERT(frame->refcount); |
202 | |||
203 | if (!--frame->refcount) { |
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533 | bondari | 204 | buddy_system_free(zone->buddy_system, &frame->buddy_link); |
368 | jermar | 205 | } |
539 | jermar | 206 | |
207 | /* Update zone information. */ |
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208 | zone->free_count += (1 << frame->buddy_order); |
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209 | zone->busy_count -= (1 << frame->buddy_order); |
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368 | jermar | 210 | |
539 | jermar | 211 | spinlock_unlock(&zone->lock); |
368 | jermar | 212 | spinlock_unlock(&zone_head_lock); |
413 | jermar | 213 | interrupts_restore(ipl); |
1 | jermar | 214 | } |
215 | |||
368 | jermar | 216 | /** Mark frame region not free. |
217 | * |
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218 | * Mark frame region not free. |
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219 | * |
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537 | jermar | 220 | * @param base Base address of non-available region. |
221 | * @param size Size of non-available region. |
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368 | jermar | 222 | */ |
533 | bondari | 223 | void frame_region_not_free(__address base, size_t size) |
1 | jermar | 224 | { |
537 | jermar | 225 | index_t index; |
533 | bondari | 226 | index = zone_blacklist_count++; |
537 | jermar | 227 | |
228 | /* Force base to the nearest lower address frame boundary. */ |
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564 | jermar | 229 | base = ALIGN_DOWN(base, FRAME_SIZE); |
537 | jermar | 230 | /* Align size to frame boundary. */ |
564 | jermar | 231 | size = ALIGN_UP(size, FRAME_SIZE); |
537 | jermar | 232 | |
564 | jermar | 233 | ASSERT(index < ZONE_BLACKLIST_SIZE); |
533 | bondari | 234 | zone_blacklist[index].base = base; |
235 | zone_blacklist[index].size = size; |
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1 | jermar | 236 | } |
367 | jermar | 237 | |
368 | jermar | 238 | |
367 | jermar | 239 | /** Initialize zonekeeping |
240 | * |
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241 | * Initialize zonekeeping. |
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242 | */ |
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243 | void zone_init(void) |
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244 | { |
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552 | palkovsky | 245 | spinlock_initialize(&zone_head_lock, "zone_head_lock"); |
367 | jermar | 246 | list_initialize(&zone_head); |
247 | } |
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248 | |||
539 | jermar | 249 | /** Create frame zones in region of available memory. |
250 | * |
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251 | * Avoid any black listed areas of non-available memory. |
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252 | * Assume that the black listed areas cannot overlap |
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253 | * one another or cross available memory region boundaries. |
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254 | * |
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255 | * @param base Base address of available memory region. |
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256 | * @param size Size of the region. |
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257 | */ |
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533 | bondari | 258 | void zone_create_in_region(__address base, size_t size) { |
259 | int i; |
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260 | zone_t * z; |
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537 | jermar | 261 | __address s; |
262 | size_t sz; |
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533 | bondari | 263 | |
264 | ASSERT(base % FRAME_SIZE == 0); |
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265 | ASSERT(size % FRAME_SIZE == 0); |
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266 | |||
537 | jermar | 267 | if (!size) |
268 | return; |
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269 | |||
533 | bondari | 270 | for (i = 0; i < zone_blacklist_count; i++) { |
271 | if (zone_blacklist[i].base >= base && zone_blacklist[i].base < base + size) { |
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272 | s = base; sz = zone_blacklist[i].base - base; |
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273 | ASSERT(base != s || sz != size); |
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274 | zone_create_in_region(s, sz); |
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275 | |||
276 | s = zone_blacklist[i].base + zone_blacklist[i].size; |
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277 | sz = (base + size) - (zone_blacklist[i].base + zone_blacklist[i].size); |
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278 | ASSERT(base != s || sz != size); |
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279 | zone_create_in_region(s, sz); |
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280 | return; |
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281 | |||
282 | } |
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283 | } |
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284 | |||
285 | z = zone_create(base, size, 0); |
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286 | |||
287 | if (!z) { |
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564 | jermar | 288 | panic("Cannot allocate zone (base=%P, size=%d).\n", base, size); |
533 | bondari | 289 | } |
290 | |||
291 | zone_attach(z); |
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292 | } |
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293 | |||
294 | |||
367 | jermar | 295 | /** Create frame zone |
296 | * |
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297 | * Create new frame zone. |
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298 | * |
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299 | * @param start Physical address of the first frame within the zone. |
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300 | * @param size Size of the zone. Must be a multiple of FRAME_SIZE. |
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301 | * @param flags Zone flags. |
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302 | * |
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303 | * @return Initialized zone. |
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304 | */ |
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533 | bondari | 305 | zone_t * zone_create(__address start, size_t size, int flags) |
367 | jermar | 306 | { |
307 | zone_t *z; |
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308 | count_t cnt; |
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309 | int i; |
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479 | bondari | 310 | __u8 max_order; |
533 | bondari | 311 | |
367 | jermar | 312 | ASSERT(start % FRAME_SIZE == 0); |
313 | ASSERT(size % FRAME_SIZE == 0); |
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314 | |||
315 | cnt = size / FRAME_SIZE; |
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316 | |||
374 | jermar | 317 | z = (zone_t *) early_malloc(sizeof(zone_t)); |
367 | jermar | 318 | if (z) { |
319 | link_initialize(&z->link); |
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552 | palkovsky | 320 | spinlock_initialize(&z->lock, "zone_lock"); |
367 | jermar | 321 | |
322 | z->base = start; |
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323 | z->flags = flags; |
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324 | |||
325 | z->free_count = cnt; |
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326 | z->busy_count = 0; |
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327 | |||
374 | jermar | 328 | z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t)); |
367 | jermar | 329 | if (!z->frames) { |
375 | jermar | 330 | early_free(z); |
367 | jermar | 331 | return NULL; |
332 | } |
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333 | |||
334 | for (i = 0; i<cnt; i++) { |
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335 | frame_initialize(&z->frames[i], z); |
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336 | } |
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337 | |||
479 | bondari | 338 | /* |
339 | * Create buddy system for the zone |
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340 | */ |
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537 | jermar | 341 | for (max_order = 0; cnt >> max_order; max_order++) |
342 | ; |
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489 | jermar | 343 | z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations, (void *) z); |
533 | bondari | 344 | |
345 | /* Stuffing frames */ |
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346 | for (i = 0; i<cnt; i++) { |
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347 | z->frames[i].refcount = 0; |
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348 | buddy_system_free(z->buddy_system, &z->frames[i].buddy_link); |
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349 | } |
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367 | jermar | 350 | } |
351 | return z; |
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352 | } |
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353 | |||
354 | /** Attach frame zone |
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355 | * |
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356 | * Attach frame zone to zone list. |
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357 | * |
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358 | * @param zone Zone to be attached. |
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359 | */ |
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360 | void zone_attach(zone_t *zone) |
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361 | { |
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413 | jermar | 362 | ipl_t ipl; |
367 | jermar | 363 | |
413 | jermar | 364 | ipl = interrupts_disable(); |
367 | jermar | 365 | spinlock_lock(&zone_head_lock); |
366 | |||
367 | list_append(&zone->link, &zone_head); |
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368 | |||
369 | spinlock_unlock(&zone_head_lock); |
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413 | jermar | 370 | interrupts_restore(ipl); |
367 | jermar | 371 | } |
372 | |||
373 | /** Initialize frame structure |
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374 | * |
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375 | * Initialize frame structure. |
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376 | * |
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377 | * @param frame Frame structure to be initialized. |
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378 | * @param zone Host frame zone. |
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379 | */ |
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380 | void frame_initialize(frame_t *frame, zone_t *zone) |
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381 | { |
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533 | bondari | 382 | frame->refcount = 1; |
383 | frame->buddy_order = 0; |
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367 | jermar | 384 | } |
479 | bondari | 385 | |
386 | |||
387 | /** Buddy system find_buddy implementation |
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489 | jermar | 388 | * |
389 | * @param b Buddy system. |
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480 | bondari | 390 | * @param block Block for which buddy should be found |
479 | bondari | 391 | * |
480 | bondari | 392 | * @return Buddy for given block if found |
479 | bondari | 393 | */ |
489 | jermar | 394 | link_t * zone_buddy_find_buddy(buddy_system_t *b, link_t * block) { |
539 | jermar | 395 | frame_t * frame; |
480 | bondari | 396 | zone_t * zone; |
564 | jermar | 397 | index_t index; |
480 | bondari | 398 | bool is_left, is_right; |
479 | bondari | 399 | |
480 | bondari | 400 | frame = list_get_instance(block, frame_t, buddy_link); |
533 | bondari | 401 | zone = (zone_t *) b->data; |
480 | bondari | 402 | |
564 | jermar | 403 | ASSERT(IS_BUDDY_ORDER_OK(FRAME_INDEX(zone, frame), frame->buddy_order)); |
404 | |||
480 | bondari | 405 | is_left = IS_BUDDY_LEFT_BLOCK(zone, frame); |
564 | jermar | 406 | is_right = IS_BUDDY_RIGHT_BLOCK(zone, frame); |
480 | bondari | 407 | |
564 | jermar | 408 | ASSERT(is_left ^ is_right); |
409 | |||
533 | bondari | 410 | if (is_left) { |
411 | index = (FRAME_INDEX(zone, frame)) + (1 << frame->buddy_order); |
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412 | } else if (is_right) { |
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413 | index = (FRAME_INDEX(zone, frame)) - (1 << frame->buddy_order); |
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414 | } |
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415 | |||
416 | if (FRAME_INDEX_VALID(zone, index)) { |
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417 | if ( zone->frames[index].buddy_order == frame->buddy_order && |
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418 | zone->frames[index].refcount == 0) { |
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419 | return &zone->frames[index].buddy_link; |
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480 | bondari | 420 | } |
421 | } |
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422 | |||
539 | jermar | 423 | return NULL; |
479 | bondari | 424 | } |
425 | |||
426 | /** Buddy system bisect implementation |
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427 | * |
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489 | jermar | 428 | * @param b Buddy system. |
480 | bondari | 429 | * @param block Block to bisect |
430 | * |
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431 | * @return right block |
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479 | bondari | 432 | */ |
489 | jermar | 433 | link_t * zone_buddy_bisect(buddy_system_t *b, link_t * block) { |
480 | bondari | 434 | frame_t * frame_l, * frame_r; |
564 | jermar | 435 | |
480 | bondari | 436 | frame_l = list_get_instance(block, frame_t, buddy_link); |
533 | bondari | 437 | frame_r = (frame_l + (1 << (frame_l->buddy_order - 1))); |
564 | jermar | 438 | |
480 | bondari | 439 | return &frame_r->buddy_link; |
479 | bondari | 440 | } |
441 | |||
442 | /** Buddy system coalesce implementation |
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443 | * |
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489 | jermar | 444 | * @param b Buddy system. |
480 | bondari | 445 | * @param block_1 First block |
446 | * @param block_2 First block's buddy |
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447 | * |
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448 | * @return Coalesced block (actually block that represents lower address) |
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479 | bondari | 449 | */ |
489 | jermar | 450 | link_t * zone_buddy_coalesce(buddy_system_t *b, link_t * block_1, link_t * block_2) { |
480 | bondari | 451 | frame_t * frame1, * frame2; |
564 | jermar | 452 | |
480 | bondari | 453 | frame1 = list_get_instance(block_1, frame_t, buddy_link); |
454 | frame2 = list_get_instance(block_2, frame_t, buddy_link); |
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564 | jermar | 455 | |
533 | bondari | 456 | return frame1 < frame2 ? block_1 : block_2; |
479 | bondari | 457 | } |
458 | |||
459 | /** Buddy system set_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 |
463 | * @param order Order to set |
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479 | bondari | 464 | */ |
489 | jermar | 465 | void zone_buddy_set_order(buddy_system_t *b, link_t * block, __u8 order) { |
480 | bondari | 466 | frame_t * frame; |
467 | frame = list_get_instance(block, frame_t, buddy_link); |
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468 | frame->buddy_order = order; |
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479 | bondari | 469 | } |
470 | |||
471 | /** Buddy system get_order implementation |
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489 | jermar | 472 | * |
473 | * @param b Buddy system. |
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480 | bondari | 474 | * @param block Buddy system block |
479 | bondari | 475 | * |
480 | bondari | 476 | * @return Order of block |
479 | bondari | 477 | */ |
489 | jermar | 478 | __u8 zone_buddy_get_order(buddy_system_t *b, link_t * block) { |
480 | bondari | 479 | frame_t * frame; |
480 | frame = list_get_instance(block, frame_t, buddy_link); |
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481 | return frame->buddy_order; |
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479 | bondari | 482 | } |
533 | bondari | 483 | |
484 | /** Buddy system mark_busy implementation |
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485 | * |
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486 | * @param b Buddy system |
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487 | * @param block Buddy system block |
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488 | * |
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489 | */ |
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490 | void zone_buddy_mark_busy(buddy_system_t *b, link_t * block) { |
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491 | frame_t * frame; |
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492 | frame = list_get_instance(block, frame_t, buddy_link); |
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493 | frame->refcount = 1; |
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494 | } |