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  1. /*
  2.  * Copyright (c) 2001-2005 Jakub Jermar
  3.  * Copyright (c) 2005 Sergey Bondari
  4.  * Copyright (c) 2009 Martin Decky
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  *
  11.  * - Redistributions of source code must retain the above copyright
  12.  *   notice, this list of conditions and the following disclaimer.
  13.  * - Redistributions in binary form must reproduce the above copyright
  14.  *   notice, this list of conditions and the following disclaimer in the
  15.  *   documentation and/or other materials provided with the distribution.
  16.  * - The name of the author may not be used to endorse or promote products
  17.  *   derived from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /** @addtogroup genericmm
  32.  * @{
  33.  */
  34.  
  35. /**
  36.  * @file
  37.  * @brief Physical frame allocator.
  38.  *
  39.  * This file contains the physical frame allocator and memory zone management.
  40.  * The frame allocator is built on top of the buddy allocator.
  41.  *
  42.  * @see buddy.c
  43.  */
  44.  
  45. #include <arch/types.h>
  46. #include <mm/frame.h>
  47. #include <mm/as.h>
  48. #include <panic.h>
  49. #include <debug.h>
  50. #include <adt/list.h>
  51. #include <synch/mutex.h>
  52. #include <synch/condvar.h>
  53. #include <arch/asm.h>
  54. #include <arch.h>
  55. #include <print.h>
  56. #include <align.h>
  57. #include <mm/slab.h>
  58. #include <bitops.h>
  59. #include <macros.h>
  60. #include <config.h>
  61.  
  62. zones_t zones;
  63.  
  64. /*
  65.  * Synchronization primitives used to sleep when there is no memory
  66.  * available.
  67.  */
  68. mutex_t mem_avail_mtx;
  69. condvar_t mem_avail_cv;
  70. count_t mem_avail_req = 0;  /**< Number of frames requested. */
  71. count_t mem_avail_gen = 0;  /**< Generation counter. */
  72.  
  73. /********************/
  74. /* Helper functions */
  75. /********************/
  76.  
  77. static inline index_t frame_index(zone_t *zone, frame_t *frame)
  78. {
  79.     return (index_t) (frame - zone->frames);
  80. }
  81.  
  82. static inline index_t frame_index_abs(zone_t *zone, frame_t *frame)
  83. {
  84.     return (index_t) (frame - zone->frames) + zone->base;
  85. }
  86.  
  87. static inline bool frame_index_valid(zone_t *zone, index_t index)
  88. {
  89.     return (index < zone->count);
  90. }
  91.  
  92. static inline index_t make_frame_index(zone_t *zone, frame_t *frame)
  93. {
  94.     return (frame - zone->frames);
  95. }
  96.  
  97. /** Initialize frame structure.
  98.  *
  99.  * @param frame Frame structure to be initialized.
  100.  *
  101.  */
  102. static void frame_initialize(frame_t *frame)
  103. {
  104.     frame->refcount = 1;
  105.     frame->buddy_order = 0;
  106. }
  107.  
  108. /*******************/
  109. /* Zones functions */
  110. /*******************/
  111.  
  112. /** Insert-sort zone into zones list.
  113.  *
  114.  * Assume interrupts are disabled and zones lock is
  115.  * locked.
  116.  *
  117.  * @param base  Base frame of the newly inserted zone.
  118.  * @param count Number of frames of the newly inserted zone.
  119.  *
  120.  * @return Zone number on success, -1 on error.
  121.  *
  122.  */
  123. static count_t zones_insert_zone(pfn_t base, count_t count)
  124. {
  125.     if (zones.count + 1 == ZONES_MAX) {
  126.         printf("Maximum zone count %u exceeded!\n", ZONES_MAX);
  127.         return (count_t) -1;
  128.     }
  129.    
  130.     count_t i;
  131.     for (i = 0; i < zones.count; i++) {
  132.         /* Check for overlap */
  133.         if (overlaps(base, count,
  134.             zones.info[i].base, zones.info[i].count)) {
  135.             printf("Zones overlap!\n");
  136.             return (count_t) -1;
  137.         }
  138.         if (base < zones.info[i].base)
  139.             break;
  140.     }
  141.    
  142.     /* Move other zones up */
  143.     count_t j;
  144.     for (j = zones.count; j > i; j--) {
  145.         zones.info[j] = zones.info[j - 1];
  146.         zones.info[j].buddy_system->data =
  147.             (void *) &zones.info[j - 1];
  148.     }
  149.    
  150.     zones.count++;
  151.    
  152.     return i;
  153. }
  154.  
  155. /** Get total available frames.
  156.  *
  157.  * Assume interrupts are disabled and zones lock is
  158.  * locked.
  159.  *
  160.  * @return Total number of available frames.
  161.  *
  162.  */
  163. #ifdef CONFIG_DEBUG
  164. static count_t total_frames_free(void)
  165. {
  166.     count_t total = 0;
  167.     count_t i;
  168.     for (i = 0; i < zones.count; i++)
  169.         total += zones.info[i].free_count;
  170.    
  171.     return total;
  172. }
  173. #endif
  174.  
  175. /** Find a zone with a given frames.
  176.  *
  177.  * Assume interrupts are disabled and zones lock is
  178.  * locked.
  179.  *
  180.  * @param frame Frame number contained in zone.
  181.  * @param count Number of frames to look for.
  182.  * @param hint  Used as zone hint.
  183.  *
  184.  * @return Zone index or -1 if not found.
  185.  *
  186.  */
  187. count_t find_zone(pfn_t frame, count_t count, count_t hint)
  188. {
  189.     if (hint >= zones.count)
  190.         hint = 0;
  191.    
  192.     count_t i = hint;
  193.     do {
  194.         if ((zones.info[i].base <= frame)
  195.             && (zones.info[i].base + zones.info[i].count >= frame + count))
  196.             return i;
  197.        
  198.         i++;
  199.         if (i >= zones.count)
  200.             i = 0;
  201.     } while (i != hint);
  202.    
  203.     return (count_t) -1;
  204. }
  205.  
  206. /** @return True if zone can allocate specified order */
  207. static bool zone_can_alloc(zone_t *zone, uint8_t order)
  208. {
  209.     return (zone_flags_available(zone->flags)
  210.         && buddy_system_can_alloc(zone->buddy_system, order));
  211. }
  212.  
  213. /** Find a zone that can allocate order frames.
  214.  *
  215.  * Assume interrupts are disabled and zones lock is
  216.  * locked.
  217.  *
  218.  * @param order Size (2^order) of free space we are trying to find.
  219.  * @param flags Required flags of the target zone.
  220.  * @param hind  Preferred zone.
  221.  *
  222.  */
  223. static count_t find_free_zone(uint8_t order, zone_flags_t flags, count_t hint)
  224. {
  225.     if (hint >= zones.count)
  226.         hint = 0;
  227.    
  228.     count_t i = hint;
  229.     do {
  230.         /*
  231.          * Check whether the zone meets the search criteria.
  232.          */
  233.         if ((zones.info[i].flags & flags) == flags) {
  234.             /*
  235.              * Check if the zone has 2^order frames area available.
  236.              */
  237.             if (zone_can_alloc(&zones.info[i], order))
  238.                 return i;
  239.         }
  240.        
  241.         i++;
  242.         if (i >= zones.count)
  243.             i = 0;
  244.     } while (i != hint);
  245.    
  246.     return (count_t) -1;
  247. }
  248.  
  249. /**************************/
  250. /* Buddy system functions */
  251. /**************************/
  252.  
  253. /** Buddy system find_block implementation.
  254.  *
  255.  * Find block that is parent of current list.
  256.  * That means go to lower addresses, until such block is found
  257.  *
  258.  * @param order Order of parent must be different then this
  259.  *              parameter!!
  260.  *
  261.  */
  262. static link_t *zone_buddy_find_block(buddy_system_t *buddy, link_t *child,
  263.     uint8_t order)
  264. {
  265.     frame_t *frame = list_get_instance(child, frame_t, buddy_link);
  266.     zone_t *zone = (zone_t *) buddy->data;
  267.    
  268.     index_t index = frame_index(zone, frame);
  269.     do {
  270.         if (zone->frames[index].buddy_order != order)
  271.             return &zone->frames[index].buddy_link;
  272.     } while (index-- > 0);
  273.    
  274.     return NULL;
  275. }
  276.  
  277. /** Buddy system find_buddy implementation.
  278.  *
  279.  * @param buddy Buddy system.
  280.  * @param block Block for which buddy should be found.
  281.  *
  282.  * @return Buddy for given block if found.
  283.  *
  284.  */
  285. static link_t *zone_buddy_find_buddy(buddy_system_t *buddy, link_t *block)
  286. {
  287.     frame_t *frame = list_get_instance(block, frame_t, buddy_link);
  288.     zone_t *zone = (zone_t *) buddy->data;
  289.     ASSERT(IS_BUDDY_ORDER_OK(frame_index_abs(zone, frame),
  290.         frame->buddy_order));
  291.    
  292.     bool is_left = IS_BUDDY_LEFT_BLOCK_ABS(zone, frame);
  293.    
  294.     index_t index;
  295.     if (is_left) {
  296.         index = (frame_index(zone, frame)) +
  297.             (1 << frame->buddy_order);
  298.     } else {    /* is_right */
  299.         index = (frame_index(zone, frame)) -
  300.             (1 << frame->buddy_order);
  301.     }
  302.    
  303.     if (frame_index_valid(zone, index)) {
  304.         if ((zone->frames[index].buddy_order == frame->buddy_order) &&
  305.             (zone->frames[index].refcount == 0)) {
  306.             return &zone->frames[index].buddy_link;
  307.         }
  308.     }
  309.    
  310.     return NULL;
  311. }
  312.  
  313. /** Buddy system bisect implementation.
  314.  *
  315.  * @param buddy Buddy system.
  316.  * @param block Block to bisect.
  317.  *
  318.  * @return Right block.
  319.  *
  320.  */
  321. static link_t *zone_buddy_bisect(buddy_system_t *buddy, link_t *block)
  322. {
  323.     frame_t *frame_l = list_get_instance(block, frame_t, buddy_link);
  324.     frame_t *frame_r = (frame_l + (1 << (frame_l->buddy_order - 1)));
  325.    
  326.     return &frame_r->buddy_link;
  327. }
  328.  
  329. /** Buddy system coalesce implementation.
  330.  *
  331.  * @param buddy   Buddy system.
  332.  * @param block_1 First block.
  333.  * @param block_2 First block's buddy.
  334.  *
  335.  * @return Coalesced block (actually block that represents lower
  336.  *         address).
  337.  *
  338.  */
  339. static link_t *zone_buddy_coalesce(buddy_system_t *buddy, link_t *block_1,
  340.     link_t *block_2)
  341. {
  342.     frame_t *frame1 = list_get_instance(block_1, frame_t, buddy_link);
  343.     frame_t *frame2 = list_get_instance(block_2, frame_t, buddy_link);
  344.    
  345.     return ((frame1 < frame2) ? block_1 : block_2);
  346. }
  347.  
  348. /** Buddy system set_order implementation.
  349.  *
  350.  * @param buddy Buddy system.
  351.  * @param block Buddy system block.
  352.  * @param order Order to set.
  353.  *
  354.  */
  355. static void zone_buddy_set_order(buddy_system_t *buddy, link_t *block,
  356.     uint8_t order)
  357. {
  358.     list_get_instance(block, frame_t, buddy_link)->buddy_order = order;
  359. }
  360.  
  361. /** Buddy system get_order implementation.
  362.  *
  363.  * @param buddy Buddy system.
  364.  * @param block Buddy system block.
  365.  *
  366.  * @return Order of block.
  367.  *
  368.  */
  369. static uint8_t zone_buddy_get_order(buddy_system_t *buddy, link_t *block)
  370. {
  371.     return list_get_instance(block, frame_t, buddy_link)->buddy_order;
  372. }
  373.  
  374. /** Buddy system mark_busy implementation.
  375.  *
  376.  * @param buddy Buddy system.
  377.  * @param block Buddy system block.
  378.  *
  379.  */
  380. static void zone_buddy_mark_busy(buddy_system_t *buddy, link_t * block)
  381. {
  382.     list_get_instance(block, frame_t, buddy_link)->refcount = 1;
  383. }
  384.  
  385. /** Buddy system mark_available implementation.
  386.  *
  387.  * @param buddy Buddy system.
  388.  * @param block Buddy system block.
  389.  */
  390. static void zone_buddy_mark_available(buddy_system_t *buddy, link_t *block)
  391. {
  392.     list_get_instance(block, frame_t, buddy_link)->refcount = 0;
  393. }
  394.  
  395. static buddy_system_operations_t zone_buddy_system_operations = {
  396.     .find_buddy = zone_buddy_find_buddy,
  397.     .bisect = zone_buddy_bisect,
  398.     .coalesce = zone_buddy_coalesce,
  399.     .set_order = zone_buddy_set_order,
  400.     .get_order = zone_buddy_get_order,
  401.     .mark_busy = zone_buddy_mark_busy,
  402.     .mark_available = zone_buddy_mark_available,
  403.     .find_block = zone_buddy_find_block
  404. };
  405.  
  406. /******************/
  407. /* Zone functions */
  408. /******************/
  409.  
  410. /** Allocate frame in particular zone.
  411.  *
  412.  * Assume zone is locked and is available for allocation.
  413.  * Panics if allocation is impossible.
  414.  *
  415.  * @param zone  Zone to allocate from.
  416.  * @param order Allocate exactly 2^order frames.
  417.  *
  418.  * @return Frame index in zone.
  419.  *
  420.  */
  421. static pfn_t zone_frame_alloc(zone_t *zone, uint8_t order)
  422. {
  423.     ASSERT(zone_flags_available(zone->flags));
  424.    
  425.     /* Allocate frames from zone buddy system */
  426.     link_t *link = buddy_system_alloc(zone->buddy_system, order);
  427.    
  428.     ASSERT(link);
  429.    
  430.     /* Update zone information. */
  431.     zone->free_count -= (1 << order);
  432.     zone->busy_count += (1 << order);
  433.    
  434.     /* Frame will be actually a first frame of the block. */
  435.     frame_t *frame = list_get_instance(link, frame_t, buddy_link);
  436.    
  437.     /* Get frame address */
  438.     return make_frame_index(zone, frame);
  439. }
  440.  
  441. /** Free frame from zone.
  442.  *
  443.  * Assume zone is locked and is available for deallocation.
  444.  *
  445.  * @param zone      Pointer to zone from which the frame is to be freed.
  446.  * @param frame_idx Frame index relative to zone.
  447.  *
  448.  */
  449. static void zone_frame_free(zone_t *zone, index_t frame_idx)
  450. {
  451.     ASSERT(zone_flags_available(zone->flags));
  452.    
  453.     frame_t *frame = &zone->frames[frame_idx];
  454.    
  455.     /* Remember frame order */
  456.     uint8_t order = frame->buddy_order;
  457.    
  458.     ASSERT(frame->refcount);
  459.    
  460.     if (!--frame->refcount) {
  461.         buddy_system_free(zone->buddy_system, &frame->buddy_link);
  462.        
  463.         /* Update zone information. */
  464.         zone->free_count += (1 << order);
  465.         zone->busy_count -= (1 << order);
  466.     }
  467. }
  468.  
  469. /** Return frame from zone. */
  470. static frame_t *zone_get_frame(zone_t *zone, index_t frame_idx)
  471. {
  472.     ASSERT(frame_idx < zone->count);
  473.     return &zone->frames[frame_idx];
  474. }
  475.  
  476. /** Mark frame in zone unavailable to allocation. */
  477. static void zone_mark_unavailable(zone_t *zone, index_t frame_idx)
  478. {
  479.     ASSERT(zone_flags_available(zone->flags));
  480.    
  481.     frame_t *frame = zone_get_frame(zone, frame_idx);
  482.     if (frame->refcount)
  483.         return;
  484.    
  485.     link_t *link __attribute__ ((unused));
  486.    
  487.     link = buddy_system_alloc_block(zone->buddy_system,
  488.         &frame->buddy_link);
  489.    
  490.     ASSERT(link);
  491.     zone->free_count--;
  492. }
  493.  
  494. /** Merge two zones.
  495.  *
  496.  * Expect buddy to point to space at least zone_conf_size large.
  497.  * Assume z1 & z2 are locked and compatible and zones lock is
  498.  * locked.
  499.  *
  500.  * @param z1     First zone to merge.
  501.  * @param z2     Second zone to merge.
  502.  * @param old_z1 Original date of the first zone.
  503.  * @param buddy  Merged zone buddy.
  504.  *
  505.  */
  506. static void zone_merge_internal(count_t z1, count_t z2, zone_t *old_z1, buddy_system_t *buddy)
  507. {
  508.     ASSERT(zone_flags_available(zones.info[z1].flags));
  509.     ASSERT(zone_flags_available(zones.info[z2].flags));
  510.     ASSERT(zones.info[z1].flags == zones.info[z2].flags);
  511.     ASSERT(zones.info[z1].base < zones.info[z2].base);
  512.     ASSERT(!overlaps(zones.info[z1].base, zones.info[z1].count,
  513.         zones.info[z2].base, zones.info[z2].count));
  514.    
  515.     /* Difference between zone bases */
  516.     pfn_t base_diff = zones.info[z2].base - zones.info[z1].base;
  517.    
  518.     zones.info[z1].count = base_diff + zones.info[z2].count;
  519.     zones.info[z1].free_count += zones.info[z2].free_count;
  520.     zones.info[z1].busy_count += zones.info[z2].busy_count;
  521.     zones.info[z1].buddy_system = buddy;
  522.    
  523.     uint8_t order = fnzb(zones.info[z1].count);
  524.     buddy_system_create(zones.info[z1].buddy_system, order,
  525.         &zone_buddy_system_operations, (void *) &zones.info[z1]);
  526.    
  527.     zones.info[z1].frames =
  528.         (frame_t *) ((uint8_t *) zones.info[z1].buddy_system
  529.         + buddy_conf_size(order));
  530.    
  531.     /* This marks all frames busy */
  532.     count_t i;
  533.     for (i = 0; i < zones.info[z1].count; i++)
  534.         frame_initialize(&zones.info[z1].frames[i]);
  535.    
  536.     /* Copy frames from both zones to preserve full frame orders,
  537.      * parents etc. Set all free frames with refcount = 0 to 1, because
  538.      * we add all free frames to buddy allocator later again, clearing
  539.      * order to 0. Don't set busy frames with refcount = 0, as they
  540.      * will not be reallocated during merge and it would make later
  541.      * problems with allocation/free.
  542.      */
  543.     for (i = 0; i < old_z1->count; i++)
  544.         zones.info[z1].frames[i] = old_z1->frames[i];
  545.    
  546.     for (i = 0; i < zones.info[z2].count; i++)
  547.         zones.info[z1].frames[base_diff + i]
  548.             = zones.info[z2].frames[i];
  549.    
  550.     i = 0;
  551.     while (i < zones.info[z1].count) {
  552.         if (zones.info[z1].frames[i].refcount) {
  553.             /* Skip busy frames */
  554.             i += 1 << zones.info[z1].frames[i].buddy_order;
  555.         } else {
  556.             /* Free frames, set refcount = 1
  557.              * (all free frames have refcount == 0, we need not
  558.              * to check the order)
  559.              */
  560.             zones.info[z1].frames[i].refcount = 1;
  561.             zones.info[z1].frames[i].buddy_order = 0;
  562.             i++;
  563.         }
  564.     }
  565.    
  566.     /* Add free blocks from the original zone z1 */
  567.     while (zone_can_alloc(old_z1, 0)) {
  568.         /* Allocate from the original zone */
  569.         pfn_t frame_idx = zone_frame_alloc(old_z1, 0);
  570.        
  571.         /* Free the frame from the merged zone */
  572.         frame_t *frame = &zones.info[z1].frames[frame_idx];
  573.         frame->refcount = 0;
  574.         buddy_system_free(zones.info[z1].buddy_system, &frame->buddy_link);
  575.     }
  576.    
  577.     /* Add free blocks from the original zone z2 */
  578.     while (zone_can_alloc(&zones.info[z2], 0)) {
  579.         /* Allocate from the original zone */
  580.         pfn_t frame_idx = zone_frame_alloc(&zones.info[z2], 0);
  581.        
  582.         /* Free the frame from the merged zone */
  583.         frame_t *frame = &zones.info[z1].frames[base_diff + frame_idx];
  584.         frame->refcount = 0;
  585.         buddy_system_free(zones.info[z1].buddy_system, &frame->buddy_link);
  586.     }
  587. }
  588.  
  589. /** Return old configuration frames into the zone.
  590.  *
  591.  * We have two cases:
  592.  * - The configuration data is outside the zone
  593.  *   -> do nothing (perhaps call frame_free?)
  594.  * - The configuration data was created by zone_create
  595.  *   or updated by reduce_region -> free every frame
  596.  *
  597.  * @param znum  The actual zone where freeing should occur.
  598.  * @param pfn   Old zone configuration frame.
  599.  * @param count Old zone frame count.
  600.  *
  601.  */
  602. static void return_config_frames(count_t znum, pfn_t pfn, count_t count)
  603. {
  604.     ASSERT(zone_flags_available(zones.info[znum].flags));
  605.    
  606.     count_t cframes = SIZE2FRAMES(zone_conf_size(count));
  607.    
  608.     if ((pfn < zones.info[znum].base)
  609.         || (pfn >= zones.info[znum].base + zones.info[znum].count))
  610.         return;
  611.    
  612.     frame_t *frame __attribute__ ((unused));
  613.  
  614.     frame = &zones.info[znum].frames[pfn - zones.info[znum].base];
  615.     ASSERT(!frame->buddy_order);
  616.    
  617.     count_t i;
  618.     for (i = 0; i < cframes; i++) {
  619.         zones.info[znum].busy_count++;
  620.         zone_frame_free(&zones.info[znum],
  621.             pfn - zones.info[znum].base + i);
  622.     }
  623. }
  624.  
  625. /** Reduce allocated block to count of order 0 frames.
  626.  *
  627.  * The allocated block needs 2^order frames. Reduce all frames
  628.  * in the block to order 0 and free the unneeded frames. This means that
  629.  * when freeing the previously allocated block starting with frame_idx,
  630.  * you have to free every frame.
  631.  *
  632.  * @param znum      Zone.
  633.  * @param frame_idx Index the first frame of the block.
  634.  * @param count     Allocated frames in block.
  635.  *
  636.  */
  637. static void zone_reduce_region(count_t znum, pfn_t frame_idx, count_t count)
  638. {
  639.     ASSERT(zone_flags_available(zones.info[znum].flags));
  640.     ASSERT(frame_idx + count < zones.info[znum].count);
  641.    
  642.     uint8_t order = zones.info[znum].frames[frame_idx].buddy_order;
  643.     ASSERT((count_t) (1 << order) >= count);
  644.    
  645.     /* Reduce all blocks to order 0 */
  646.     count_t i;
  647.     for (i = 0; i < (count_t) (1 << order); i++) {
  648.         frame_t *frame = &zones.info[znum].frames[i + frame_idx];
  649.         frame->buddy_order = 0;
  650.         if (!frame->refcount)
  651.             frame->refcount = 1;
  652.         ASSERT(frame->refcount == 1);
  653.     }
  654.    
  655.     /* Free unneeded frames */
  656.     for (i = count; i < (count_t) (1 << order); i++)
  657.         zone_frame_free(&zones.info[znum], i + frame_idx);
  658. }
  659.  
  660. /** Merge zones z1 and z2.
  661.  *
  662.  * The merged zones must be 2 zones with no zone existing in between
  663.  * (which means that z2 = z1 + 1). Both zones must be available zones
  664.  * with the same flags.
  665.  *
  666.  * When you create a new zone, the frame allocator configuration does
  667.  * not to be 2^order size. Once the allocator is running it is no longer
  668.  * possible, merged configuration data occupies more space :-/
  669.  *
  670.  * The function uses
  671.  *
  672.  */
  673. bool zone_merge(count_t z1, count_t z2)
  674. {
  675.     ipl_t ipl = interrupts_disable();
  676.     spinlock_lock(&zones.lock);
  677.    
  678.     bool ret = true;
  679.    
  680.     /* We can join only 2 zones with none existing inbetween,
  681.      * the zones have to be available and with the same
  682.      * set of flags
  683.      */
  684.     if ((z1 >= zones.count) || (z2 >= zones.count)
  685.         || (z2 - z1 != 1)
  686.         || (!zone_flags_available(zones.info[z1].flags))
  687.         || (!zone_flags_available(zones.info[z2].flags))
  688.         || (zones.info[z1].flags != zones.info[z2].flags)) {
  689.         ret = false;
  690.         goto errout;
  691.     }
  692.    
  693.     pfn_t cframes = SIZE2FRAMES(zone_conf_size(
  694.         zones.info[z2].base - zones.info[z1].base
  695.         + zones.info[z2].count));
  696.    
  697.     uint8_t order;
  698.     if (cframes == 1)
  699.         order = 0;
  700.     else
  701.         order = fnzb(cframes - 1) + 1;
  702.    
  703.     /* Allocate merged zone data inside one of the zones */
  704.     pfn_t pfn;
  705.     if (zone_can_alloc(&zones.info[z1], order)) {
  706.         pfn = zones.info[z1].base + zone_frame_alloc(&zones.info[z1], order);
  707.     } else if (zone_can_alloc(&zones.info[z2], order)) {
  708.         pfn = zones.info[z2].base + zone_frame_alloc(&zones.info[z2], order);
  709.     } else {
  710.         ret = false;
  711.         goto errout;
  712.     }
  713.    
  714.     /* Preserve original data from z1 */
  715.     zone_t old_z1 = zones.info[z1];
  716.     old_z1.buddy_system->data = (void *) &old_z1;
  717.    
  718.     /* Do zone merging */
  719.     buddy_system_t *buddy = (buddy_system_t *) PA2KA(PFN2ADDR(pfn));
  720.     zone_merge_internal(z1, z2, &old_z1, buddy);
  721.    
  722.     /* Free unneeded config frames */
  723.     zone_reduce_region(z1, pfn - zones.info[z1].base, cframes);
  724.    
  725.     /* Subtract zone information from busy frames */
  726.     zones.info[z1].busy_count -= cframes;
  727.    
  728.     /* Free old zone information */
  729.     return_config_frames(z1,
  730.         ADDR2PFN(KA2PA((uintptr_t) old_z1.frames)), old_z1.count);
  731.     return_config_frames(z1,
  732.         ADDR2PFN(KA2PA((uintptr_t) zones.info[z2].frames)),
  733.         zones.info[z2].count);
  734.    
  735.     /* Move zones down */
  736.     count_t i;
  737.     for (i = z2 + 1; i < zones.count; i++) {
  738.         zones.info[i - 1] = zones.info[i];
  739.         zones.info[i - 1].buddy_system->data =
  740.             (void *) &zones.info[i - 1];
  741.     }
  742.    
  743.     zones.count--;
  744.    
  745. errout:
  746.     spinlock_unlock(&zones.lock);
  747.     interrupts_restore(ipl);
  748.    
  749.     return ret;
  750. }
  751.  
  752. /** Merge all mergeable zones into one big zone.
  753.  *
  754.  * It is reasonable to do this on systems where
  755.  * BIOS reports parts in chunks, so that we could
  756.  * have 1 zone (it's faster).
  757.  *
  758.  */
  759. void zone_merge_all(void)
  760. {
  761.     count_t i = 0;
  762.     while (i < zones.count) {
  763.         if (!zone_merge(i, i + 1))
  764.             i++;
  765.     }
  766. }
  767.  
  768. /** Create new frame zone.
  769.  *
  770.  * @param zone  Zone to construct.
  771.  * @param buddy Address of buddy system configuration information.
  772.  * @param start Physical address of the first frame within the zone.
  773.  * @param count Count of frames in zone.
  774.  * @param flags Zone flags.
  775.  *
  776.  * @return Initialized zone.
  777.  *
  778.  */
  779. static void zone_construct(zone_t *zone, buddy_system_t *buddy, pfn_t start, count_t count, zone_flags_t flags)
  780. {
  781.     zone->base = start;
  782.     zone->count = count;
  783.     zone->flags = flags;
  784.     zone->free_count = count;
  785.     zone->busy_count = 0;
  786.     zone->buddy_system = buddy;
  787.    
  788.     if (zone_flags_available(flags)) {
  789.         /*
  790.          * Compute order for buddy system and initialize
  791.          */
  792.         uint8_t order = fnzb(count);
  793.         buddy_system_create(zone->buddy_system, order,
  794.             &zone_buddy_system_operations, (void *) zone);
  795.        
  796.         /* Allocate frames _after_ the confframe */
  797.        
  798.         /* Check sizes */
  799.         zone->frames = (frame_t *) ((uint8_t *) zone->buddy_system +
  800.             buddy_conf_size(order));
  801.        
  802.         count_t i;
  803.         for (i = 0; i < count; i++)
  804.             frame_initialize(&zone->frames[i]);
  805.        
  806.         /* Stuffing frames */
  807.         for (i = 0; i < count; i++) {
  808.             zone->frames[i].refcount = 0;
  809.             buddy_system_free(zone->buddy_system, &zone->frames[i].buddy_link);
  810.         }
  811.     } else
  812.         zone->frames = NULL;
  813. }
  814.  
  815. /** Compute configuration data size for zone.
  816.  *
  817.  * @param count Size of zone in frames.
  818.  *
  819.  * @return Size of zone configuration info (in bytes).
  820.  *
  821.  */
  822. uintptr_t zone_conf_size(count_t count)
  823. {
  824.     return (count * sizeof(frame_t) + buddy_conf_size(fnzb(count)));
  825. }
  826.  
  827. /** Create and add zone to system.
  828.  *
  829.  * @param start     First frame number (absolute).
  830.  * @param count     Size of zone in frames.
  831.  * @param confframe Where configuration frames are supposed to be.
  832.  *                  Automatically checks, that we will not disturb the
  833.  *                  kernel and possibly init. If confframe is given
  834.  *                  _outside_ this zone, it is expected, that the area is
  835.  *                  already marked BUSY and big enough to contain
  836.  *                  zone_conf_size() amount of data. If the confframe is
  837.  *                  inside the area, the zone free frame information is
  838.  *                  modified not to include it.
  839.  *
  840.  * @return Zone number or -1 on error.
  841.  *
  842.  */
  843. count_t zone_create(pfn_t start, count_t count, pfn_t confframe, zone_flags_t flags)
  844. {
  845.     ipl_t ipl = interrupts_disable();
  846.     spinlock_lock(&zones.lock);
  847.    
  848.     if (zone_flags_available(flags)) {  /* Create available zone */
  849.         /* Theoretically we could have NULL here, practically make sure
  850.          * nobody tries to do that. If some platform requires, remove
  851.          * the assert
  852.          */
  853.         ASSERT(confframe != NULL);
  854.        
  855.         /* If confframe is supposed to be inside our zone, then make sure
  856.          * it does not span kernel & init
  857.          */
  858.         count_t confcount = SIZE2FRAMES(zone_conf_size(count));
  859.         if ((confframe >= start) && (confframe < start + count)) {
  860.             for (; confframe < start + count; confframe++) {
  861.                 uintptr_t addr = PFN2ADDR(confframe);
  862.                 if (overlaps(addr, PFN2ADDR(confcount),
  863.                     KA2PA(config.base), config.kernel_size))
  864.                     continue;
  865.                
  866.                 if (overlaps(addr, PFN2ADDR(confcount),
  867.                     KA2PA(config.stack_base), config.stack_size))
  868.                     continue;
  869.                
  870.                 bool overlap = false;
  871.                 count_t i;
  872.                 for (i = 0; i < init.cnt; i++)
  873.                     if (overlaps(addr, PFN2ADDR(confcount),
  874.                         KA2PA(init.tasks[i].addr),
  875.                         init.tasks[i].size)) {
  876.                         overlap = true;
  877.                         break;
  878.                     }
  879.                 if (overlap)
  880.                     continue;
  881.                
  882.                 break;
  883.             }
  884.            
  885.             if (confframe >= start + count)
  886.                 panic("Cannot find configuration data for zone.");
  887.         }
  888.        
  889.         count_t znum = zones_insert_zone(start, count);
  890.         if (znum == (count_t) -1) {
  891.             spinlock_unlock(&zones.lock);
  892.             interrupts_restore(ipl);
  893.             return (count_t) -1;
  894.         }
  895.        
  896.         buddy_system_t *buddy = (buddy_system_t *) PA2KA(PFN2ADDR(confframe));
  897.         zone_construct(&zones.info[znum], buddy, start, count, flags);
  898.        
  899.         /* If confdata in zone, mark as unavailable */
  900.         if ((confframe >= start) && (confframe < start + count)) {
  901.             count_t i;
  902.             for (i = confframe; i < confframe + confcount; i++)
  903.                 zone_mark_unavailable(&zones.info[znum],
  904.                     i - zones.info[znum].base);
  905.         }
  906.        
  907.         spinlock_unlock(&zones.lock);
  908.         interrupts_restore(ipl);
  909.        
  910.         return znum;
  911.     }
  912.    
  913.     /* Non-available zone */
  914.     count_t znum = zones_insert_zone(start, count);
  915.     if (znum == (count_t) -1) {
  916.         spinlock_unlock(&zones.lock);
  917.         interrupts_restore(ipl);
  918.         return (count_t) -1;
  919.     }
  920.     zone_construct(&zones.info[znum], NULL, start, count, flags);
  921.    
  922.     spinlock_unlock(&zones.lock);
  923.     interrupts_restore(ipl);
  924.    
  925.     return znum;
  926. }
  927.  
  928. /*******************/
  929. /* Frame functions */
  930. /*******************/
  931.  
  932. /** Set parent of frame. */
  933. void frame_set_parent(pfn_t pfn, void *data, count_t hint)
  934. {
  935.     ipl_t ipl = interrupts_disable();
  936.     spinlock_lock(&zones.lock);
  937.    
  938.     count_t znum = find_zone(pfn, 1, hint);
  939.    
  940.     ASSERT(znum != (count_t) -1);
  941.    
  942.     zone_get_frame(&zones.info[znum],
  943.         pfn - zones.info[znum].base)->parent = data;
  944.    
  945.     spinlock_unlock(&zones.lock);
  946.     interrupts_restore(ipl);
  947. }
  948.  
  949. void *frame_get_parent(pfn_t pfn, count_t hint)
  950. {
  951.     ipl_t ipl = interrupts_disable();
  952.     spinlock_lock(&zones.lock);
  953.    
  954.     count_t znum = find_zone(pfn, 1, hint);
  955.    
  956.     ASSERT(znum != (count_t) -1);
  957.    
  958.     void *res = zone_get_frame(&zones.info[znum],
  959.         pfn - zones.info[znum].base)->parent;
  960.    
  961.     spinlock_unlock(&zones.lock);
  962.     interrupts_restore(ipl);
  963.    
  964.     return res;
  965. }
  966.  
  967. /** Allocate power-of-two frames of physical memory.
  968.  *
  969.  * @param order Allocate exactly 2^order frames.
  970.  * @param flags Flags for host zone selection and address processing.
  971.  * @param pzone Preferred zone.
  972.  *
  973.  * @return Physical address of the allocated frame.
  974.  *
  975.  */
  976. void *frame_alloc_generic(uint8_t order, frame_flags_t flags, count_t *pzone)
  977. {
  978.     count_t size = ((count_t) 1) << order;
  979.     ipl_t ipl;
  980.     count_t hint = pzone ? (*pzone) : 0;
  981.    
  982. loop:
  983.     ipl = interrupts_disable();
  984.     spinlock_lock(&zones.lock);
  985.    
  986.     /*
  987.      * First, find suitable frame zone.
  988.      */
  989.     count_t znum = find_free_zone(order,
  990.         FRAME_TO_ZONE_FLAGS(flags), hint);
  991.    
  992.     /* If no memory, reclaim some slab memory,
  993.        if it does not help, reclaim all */
  994.     if ((znum == (count_t) -1) && (!(flags & FRAME_NO_RECLAIM))) {
  995.         count_t freed = slab_reclaim(0);
  996.        
  997.         if (freed > 0)
  998.             znum = find_free_zone(order,
  999.                 FRAME_TO_ZONE_FLAGS(flags), hint);
  1000.        
  1001.         if (znum == (count_t) -1) {
  1002.             freed = slab_reclaim(SLAB_RECLAIM_ALL);
  1003.             if (freed > 0)
  1004.                 znum = find_free_zone(order,
  1005.                     FRAME_TO_ZONE_FLAGS(flags), hint);
  1006.         }
  1007.     }
  1008.    
  1009.     if (znum == (count_t) -1) {
  1010.         if (flags & FRAME_ATOMIC) {
  1011.             spinlock_unlock(&zones.lock);
  1012.             interrupts_restore(ipl);
  1013.             return NULL;
  1014.         }
  1015.        
  1016. #ifdef CONFIG_DEBUG
  1017.         count_t avail = total_frames_free();
  1018. #endif
  1019.        
  1020.         spinlock_unlock(&zones.lock);
  1021.         interrupts_restore(ipl);
  1022.        
  1023.         /*
  1024.          * Sleep until some frames are available again.
  1025.          */
  1026.        
  1027. #ifdef CONFIG_DEBUG
  1028.         printf("Thread %" PRIu64 " waiting for %" PRIc " frames, "
  1029.             "%" PRIc " available.\n", THREAD->tid, size, avail);
  1030. #endif
  1031.        
  1032.         mutex_lock(&mem_avail_mtx);
  1033.        
  1034.         if (mem_avail_req > 0)
  1035.             mem_avail_req = min(mem_avail_req, size);
  1036.         else
  1037.             mem_avail_req = size;
  1038.         count_t gen = mem_avail_gen;
  1039.        
  1040.         while (gen == mem_avail_gen)
  1041.             condvar_wait(&mem_avail_cv, &mem_avail_mtx);
  1042.        
  1043.         mutex_unlock(&mem_avail_mtx);
  1044.        
  1045. #ifdef CONFIG_DEBUG
  1046.         printf("Thread %" PRIu64 " woken up.\n", THREAD->tid);
  1047. #endif
  1048.        
  1049.         goto loop;
  1050.     }
  1051.    
  1052.     pfn_t pfn = zone_frame_alloc(&zones.info[znum], order)
  1053.         + zones.info[znum].base;
  1054.    
  1055.     spinlock_unlock(&zones.lock);
  1056.     interrupts_restore(ipl);
  1057.    
  1058.     if (pzone)
  1059.         *pzone = znum;
  1060.    
  1061.     if (flags & FRAME_KA)
  1062.         return (void *) PA2KA(PFN2ADDR(pfn));
  1063.    
  1064.     return (void *) PFN2ADDR(pfn);
  1065. }
  1066.  
  1067. /** Free a frame.
  1068.  *
  1069.  * Find respective frame structure for supplied physical frame address.
  1070.  * Decrement frame reference count. If it drops to zero, move the frame
  1071.  * structure to free list.
  1072.  *
  1073.  * @param frame Physical Address of of the frame to be freed.
  1074.  *
  1075.  */
  1076. void frame_free(uintptr_t frame)
  1077. {
  1078.     ipl_t ipl = interrupts_disable();
  1079.     spinlock_lock(&zones.lock);
  1080.    
  1081.     /*
  1082.      * First, find host frame zone for addr.
  1083.      */
  1084.     pfn_t pfn = ADDR2PFN(frame);
  1085.     count_t znum = find_zone(pfn, 1, NULL);
  1086.    
  1087.     ASSERT(znum != (count_t) -1);
  1088.    
  1089.     zone_frame_free(&zones.info[znum], pfn - zones.info[znum].base);
  1090.    
  1091.     spinlock_unlock(&zones.lock);
  1092.     interrupts_restore(ipl);
  1093.    
  1094.     /*
  1095.      * Signal that some memory has been freed.
  1096.      */
  1097.     mutex_lock(&mem_avail_mtx);
  1098.     if (mem_avail_req > 0)
  1099.         mem_avail_req--;
  1100.    
  1101.     if (mem_avail_req == 0) {
  1102.         mem_avail_gen++;
  1103.         condvar_broadcast(&mem_avail_cv);
  1104.     }
  1105.     mutex_unlock(&mem_avail_mtx);
  1106. }
  1107.  
  1108. /** Add reference to frame.
  1109.  *
  1110.  * Find respective frame structure for supplied PFN and
  1111.  * increment frame reference count.
  1112.  *
  1113.  * @param pfn Frame number of the frame to be freed.
  1114.  *
  1115.  */
  1116. void frame_reference_add(pfn_t pfn)
  1117. {
  1118.     ipl_t ipl = interrupts_disable();
  1119.     spinlock_lock(&zones.lock);
  1120.    
  1121.     /*
  1122.      * First, find host frame zone for addr.
  1123.      */
  1124.     count_t znum = find_zone(pfn, 1, NULL);
  1125.    
  1126.     ASSERT(znum != (count_t) -1);
  1127.    
  1128.     zones.info[znum].frames[pfn - zones.info[znum].base].refcount++;
  1129.    
  1130.     spinlock_unlock(&zones.lock);
  1131.     interrupts_restore(ipl);
  1132. }
  1133.  
  1134. /** Mark given range unavailable in frame zones. */
  1135. void frame_mark_unavailable(pfn_t start, count_t count)
  1136. {
  1137.     ipl_t ipl = interrupts_disable();
  1138.     spinlock_lock(&zones.lock);
  1139.    
  1140.     count_t i;
  1141.     for (i = 0; i < count; i++) {
  1142.         count_t znum = find_zone(start + i, 1, 0);
  1143.         if (znum == (count_t) -1)  /* PFN not found */
  1144.             continue;
  1145.        
  1146.         zone_mark_unavailable(&zones.info[znum],
  1147.             start + i - zones.info[znum].base);
  1148.     }
  1149.    
  1150.     spinlock_unlock(&zones.lock);
  1151.     interrupts_restore(ipl);
  1152. }
  1153.  
  1154. /** Initialize physical memory management. */
  1155. void frame_init(void)
  1156. {
  1157.     if (config.cpu_active == 1) {
  1158.         zones.count = 0;
  1159.         spinlock_initialize(&zones.lock, "zones.lock");
  1160.         mutex_initialize(&mem_avail_mtx, MUTEX_ACTIVE);
  1161.         condvar_initialize(&mem_avail_cv);
  1162.     }
  1163.    
  1164.     /* Tell the architecture to create some memory */
  1165.     frame_arch_init();
  1166.     if (config.cpu_active == 1) {
  1167.         frame_mark_unavailable(ADDR2PFN(KA2PA(config.base)),
  1168.             SIZE2FRAMES(config.kernel_size));
  1169.         frame_mark_unavailable(ADDR2PFN(KA2PA(config.stack_base)),
  1170.             SIZE2FRAMES(config.stack_size));
  1171.        
  1172.         count_t i;
  1173.         for (i = 0; i < init.cnt; i++) {
  1174.             pfn_t pfn = ADDR2PFN(KA2PA(init.tasks[i].addr));
  1175.             frame_mark_unavailable(pfn,
  1176.                 SIZE2FRAMES(init.tasks[i].size));
  1177.         }
  1178.        
  1179.         if (ballocs.size)
  1180.             frame_mark_unavailable(ADDR2PFN(KA2PA(ballocs.base)),
  1181.                 SIZE2FRAMES(ballocs.size));
  1182.        
  1183.         /* Black list first frame, as allocating NULL would
  1184.          * fail in some places
  1185.          */
  1186.         frame_mark_unavailable(0, 1);
  1187.     }
  1188. }
  1189.  
  1190. /** Return total size of all zones. */
  1191. uint64_t zone_total_size(void)
  1192. {
  1193.     ipl_t ipl = interrupts_disable();
  1194.     spinlock_lock(&zones.lock);
  1195.    
  1196.     uint64_t total = 0;
  1197.     count_t i;
  1198.     for (i = 0; i < zones.count; i++)
  1199.         total += (uint64_t) FRAMES2SIZE(zones.info[i].count);
  1200.    
  1201.     spinlock_unlock(&zones.lock);
  1202.     interrupts_restore(ipl);
  1203.    
  1204.     return total;
  1205. }
  1206.  
  1207. /** Prints list of zones. */
  1208. void zone_print_list(void)
  1209. {
  1210. #ifdef __32_BITS__
  1211.     printf("#  base address frames       flags    free frames  busy frames\n");
  1212.     printf("-- ------------ ------------ -------- ------------ ------------\n");
  1213. #endif
  1214.  
  1215. #ifdef __64_BITS__
  1216.     printf("#  base address          frames      flags    free frames  busy frames\n");
  1217.     printf("-- -------------------- ------------ -------- ------------ ------------\n");
  1218. #endif
  1219.    
  1220.     /*
  1221.      * Because printing may require allocation of memory, we may not hold
  1222.      * the frame allocator locks when printing zone statistics.  Therefore,
  1223.      * we simply gather the statistics under the protection of the locks and
  1224.      * print the statistics when the locks have been released.
  1225.      *
  1226.      * When someone adds/removes zones while we are printing the statistics,
  1227.      * we may end up with inaccurate output (e.g. a zone being skipped from
  1228.      * the listing).
  1229.      */
  1230.    
  1231.     count_t i;
  1232.     for (i = 0;; i++) {
  1233.         ipl_t ipl = interrupts_disable();
  1234.         spinlock_lock(&zones.lock);
  1235.        
  1236.         if (i >= zones.count) {
  1237.             spinlock_unlock(&zones.lock);
  1238.             interrupts_restore(ipl);
  1239.             break;
  1240.         }
  1241.        
  1242.         uintptr_t base = PFN2ADDR(zones.info[i].base);
  1243.         count_t count = zones.info[i].count;
  1244.         zone_flags_t flags = zones.info[i].flags;
  1245.         count_t free_count = zones.info[i].free_count;
  1246.         count_t busy_count = zones.info[i].busy_count;
  1247.        
  1248.         spinlock_unlock(&zones.lock);
  1249.         interrupts_restore(ipl);
  1250.        
  1251.         bool available = zone_flags_available(flags);
  1252.        
  1253.         printf("%-2" PRIc, i);
  1254.        
  1255. #ifdef __32_BITS__
  1256.         printf("   %10p", base);
  1257. #endif
  1258.        
  1259. #ifdef __64_BITS__
  1260.         printf("   %18p", base);
  1261. #endif
  1262.        
  1263.         printf(" %12" PRIc " %c%c%c      ", count,
  1264.             available ? 'A' : ' ',
  1265.             (flags & ZONE_RESERVED) ? 'R' : ' ',
  1266.             (flags & ZONE_FIRMWARE) ? 'F' : ' ');
  1267.        
  1268.         if (available)
  1269.             printf("%12" PRIc " %12" PRIc,
  1270.                 free_count, busy_count);
  1271.        
  1272.         printf("\n");
  1273.     }
  1274. }
  1275.  
  1276. /** Prints zone details.
  1277.  *
  1278.  * @param num Zone base address or zone number.
  1279.  *
  1280.  */
  1281. void zone_print_one(count_t num)
  1282. {
  1283.     ipl_t ipl = interrupts_disable();
  1284.     spinlock_lock(&zones.lock);
  1285.     count_t znum = (count_t) -1;
  1286.    
  1287.     count_t i;
  1288.     for (i = 0; i < zones.count; i++) {
  1289.         if ((i == num) || (PFN2ADDR(zones.info[i].base) == num)) {
  1290.             znum = i;
  1291.             break;
  1292.         }
  1293.     }
  1294.    
  1295.     if (znum == (count_t) -1) {
  1296.         spinlock_unlock(&zones.lock);
  1297.         interrupts_restore(ipl);
  1298.         printf("Zone not found.\n");
  1299.         return;
  1300.     }
  1301.    
  1302.     uintptr_t base = PFN2ADDR(zones.info[i].base);
  1303.     zone_flags_t flags = zones.info[i].flags;
  1304.     count_t count = zones.info[i].count;
  1305.     count_t free_count = zones.info[i].free_count;
  1306.     count_t busy_count = zones.info[i].busy_count;
  1307.    
  1308.     spinlock_unlock(&zones.lock);
  1309.     interrupts_restore(ipl);
  1310.    
  1311.     bool available = zone_flags_available(flags);
  1312.    
  1313.     printf("Zone number:       %" PRIc "\n", znum);
  1314.     printf("Zone base address: %p\n", base);
  1315.     printf("Zone size:         %" PRIc " frames (%" PRIs " KiB)\n", count,
  1316.         SIZE2KB(FRAMES2SIZE(count)));
  1317.     printf("Zone flags:        %c%c%c\n",
  1318.         available ? 'A' : ' ',
  1319.         (flags & ZONE_RESERVED) ? 'R' : ' ',
  1320.         (flags & ZONE_FIRMWARE) ? 'F' : ' ');
  1321.    
  1322.     if (available) {
  1323.         printf("Allocated space:   %" PRIc " frames (%" PRIs " KiB)\n",
  1324.             busy_count, SIZE2KB(FRAMES2SIZE(busy_count)));
  1325.         printf("Available space:   %" PRIc " frames (%" PRIs " KiB)\n",
  1326.             free_count, SIZE2KB(FRAMES2SIZE(free_count)));
  1327.     }
  1328. }
  1329.  
  1330. /** @}
  1331.  */
  1332.