WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/mm/frame.c

 /*
  * Copyright (C) 2001-2004 Jakub Jermar
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
+ *
  * - Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
  * - Redistributions in binary form must reproduce the above copyright
  *   notice, this list of conditions and the following disclaimer in the
  *   documentation and/or other materials provided with the distribution.
  * - The name of the author may not be used to endorse or promote products
  *   derived from this software without specific prior written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 #include <typedefs.h>
 #include <arch/types.h>
 #include <mm/heap.h>
 #include <mm/frame.h>
 #include <mm/vm.h>
 #include <panic.h>
 #include <debug.h>
 #include <list.h>
 #include <synch/spinlock.h>
 #include <arch/asm.h>
 #include <arch.h>
 spinlock_t zone_head_lock;       /**< this lock protects zone_head list */
 link_t zone_head;                /**< list of all zones in the system */
+static struct buddy_system_operations  zone_buddy_system_operations = {
+    .find_buddy = zone_buddy_find_buddy,
+    .bisect = zone_buddy_bisect,
+    .coalesce = zone_buddy_coalesce,
+    .set_order = zone_buddy_set_order,
+    .get_order = zone_buddy_get_order,
+};
 /** Initialize physical memory management
+ *
  * Initialize physical memory managemnt.
  */
 void frame_init(void)
+{
     if (config.cpu_active == 1) {
         zone_init();
+    }
     frame_arch_init();
     if (config.cpu_active == 1) {
                 frame_region_not_free(config.base, config.base + config.kernel_size + CONFIG_STACK_SIZE);
+        }
+}
 /** Allocate a frame
+ *
  * Allocate a frame of physical memory.
+ *
  * @param flags Flags for host zone selection and address processing.
+ *
  * @return Allocated frame.
  */
 __address frame_alloc(int flags)
+{
     ipl_t ipl;
     link_t *cur, *tmp;
     zone_t *z;
     zone_t *zone = NULL;
     frame_t *frame = NULL;
     __address v;
 loop:
     ipl = interrupts_disable();
     spinlock_lock(&zone_head_lock);
     /*
      * First, find suitable frame zone.
      */
     for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
         z = list_get_instance(cur, zone_t, link);
         spinlock_lock(&z->lock);
         /*
          * Check if the zone has any free frames.
          */
         if (z->free_count) {
             zone = z;
             break;
+        }
         spinlock_unlock(&z->lock);
+    }
     if (!zone) {
         if (flags & FRAME_PANIC)
             panic("Can't allocate frame.\n");
         /*
          * TODO: Sleep until frames are available again.
          */
         spinlock_unlock(&zone_head_lock);
         interrupts_restore(ipl);
         panic("Sleep not implemented.\n");
         goto loop;
+    }
     tmp = zone->free_head.next;
     frame = list_get_instance(tmp, frame_t, link);
     frame->refcount++;
     list_remove(tmp);           /* remove frame from free_head */
     zone->free_count--;
     zone->busy_count++;
-    v = zone->base + (frame - zone->frames) * FRAME_SIZE;
+    //v = zone->base + (frame - zone->frames) * FRAME_SIZE;
+    v = FRAME2ADDR(zone, frame);
     if (flags & FRAME_KA)
         v = PA2KA(v);
     spinlock_unlock(&zone->lock);
     spinlock_unlock(&zone_head_lock);
     interrupts_restore(ipl);
     return v;
+}
 /** Free a frame.
+ *
  * Find respective frame structrue for supplied addr.
  * Decrement frame reference count.
  * If it drops to zero, move the frame structure to free list.
+ *
  * @param addr Address of the frame to be freed. It must be a multiple of FRAME_SIZE.
  */
 void frame_free(__address addr)
+{
     ipl_t ipl;
     link_t *cur;
     zone_t *z;
     zone_t *zone = NULL;
     frame_t *frame;
     ASSERT(addr % FRAME_SIZE == 0);
     ipl = interrupts_disable();
     spinlock_lock(&zone_head_lock);
     /*
      * First, find host frame zone for addr.
      */
     for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
         z = list_get_instance(cur, zone_t, link);
         spinlock_lock(&z->lock);
         if (IS_KA(addr))
             addr = KA2PA(addr);
         /*
          * Check if addr belongs to z.
          */
         if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
             zone = z;
             break;
+        }
         spinlock_unlock(&z->lock);
+    }
     ASSERT(zone != NULL);
+    frame = ADDR2FRAME(zone, addr);
-    frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
+    // frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
     ASSERT(frame->refcount);
     if (!--frame->refcount) {
         list_append(&frame->link, &zone->free_head);    /* append frame to free_head */
         zone->free_count++;
         zone->busy_count--;
+    }
     spinlock_unlock(&zone->lock);
     spinlock_unlock(&zone_head_lock);
     interrupts_restore(ipl);
+}
 /** Mark frame not free.
+ *
  * Find respective frame structrue for supplied addr.
  * Increment frame reference count and remove the frame structure from free list.
+ *
  * @param addr Address of the frame to be marked. It must be a multiple of FRAME_SIZE.
  */
 void frame_not_free(__address addr)
+{
     ipl_t ipl;
     link_t *cur;
     zone_t *z;
     zone_t *zone = NULL;
     frame_t *frame;
     ASSERT(addr % FRAME_SIZE == 0);
     ipl = interrupts_disable();
     spinlock_lock(&zone_head_lock);
     /*
      * First, find host frame zone for addr.
      */
     for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
         z = list_get_instance(cur, zone_t, link);
         spinlock_lock(&z->lock);
         if (IS_KA(addr))
             addr = KA2PA(addr);
         /*
          * Check if addr belongs to z.
          */
         if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
             zone = z;
             break;
+        }
         spinlock_unlock(&z->lock);
+    }
     ASSERT(zone != NULL);
-    frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
+    //frame = &zone->frames[(addr - zone->base)/FRAME_SIZE];
+    frame = ADDR2FRAME(zone, addr);
     if (!frame->refcount) {
         frame->refcount++;
         list_remove(&frame->link);          /* remove frame from free_head */
         zone->free_count--;
         zone->busy_count++;
+    }
     spinlock_unlock(&zone->lock);
     spinlock_unlock(&zone_head_lock);
     interrupts_restore(ipl);
+}
 /** Mark frame region not free.
+ *
  * Mark frame region not free.
+ *
  * @param start First address.
  * @param stop Last address.
  */
 void frame_region_not_free(__address start, __address stop)
+{
         __address a;
         start /= FRAME_SIZE;
         stop /= FRAME_SIZE;
         for (a = start; a <= stop; a++)
                 frame_not_free(a * FRAME_SIZE);
+}
 /** Initialize zonekeeping
+ *
  * Initialize zonekeeping.
  */
 void zone_init(void)
+{
     spinlock_initialize(&zone_head_lock);
     list_initialize(&zone_head);
+}
 /** Create frame zone
+ *
  * Create new frame zone.
+ *
  * @param start Physical address of the first frame within the zone.
  * @param size Size of the zone. Must be a multiple of FRAME_SIZE.
  * @param flags Zone flags.
+ *
  * @return Initialized zone.
  */
 zone_t *zone_create(__address start, size_t size, int flags)
+{
     zone_t *z;
     count_t cnt;
     int i;
+    __u8 max_order;
     ASSERT(start % FRAME_SIZE == 0);
     ASSERT(size % FRAME_SIZE == 0);
     cnt = size / FRAME_SIZE;
     z = (zone_t *) early_malloc(sizeof(zone_t));
     if (z) {
         link_initialize(&z->link);
         spinlock_initialize(&z->lock);
         z->base = start;
         z->flags = flags;
         z->free_count = cnt;
         list_initialize(&z->free_head);
         z->busy_count = 0;
         z->frames = (frame_t *) early_malloc(cnt * sizeof(frame_t));
         if (!z->frames) {
             early_free(z);
             return NULL;
+        }
         for (i = 0; i<cnt; i++) {
             frame_initialize(&z->frames[i], z);
             list_append(&z->frames[i].link, &z->free_head);
+        }
+        /*
+         * Create buddy system for the zone
+         */
+        for (max_order = 0; cnt >> max_order; max_order++);
+        z->buddy_system = buddy_system_create(max_order, &zone_buddy_system_operations);
+    }
     return z;
+}
 /** Attach frame zone
+ *
  * Attach frame zone to zone list.
+ *
  * @param zone Zone to be attached.
  */
 void zone_attach(zone_t *zone)
+{
     ipl_t ipl;
     ipl = interrupts_disable();
     spinlock_lock(&zone_head_lock);
     list_append(&zone->link, &zone_head);
     spinlock_unlock(&zone_head_lock);
     interrupts_restore(ipl);
+}
 /** Initialize frame structure
+ *
  * Initialize frame structure.
+ *
  * @param frame Frame structure to be initialized.
  * @param zone Host frame zone.
  */
 void frame_initialize(frame_t *frame, zone_t *zone)
+{
     frame->refcount = 0;
     link_initialize(&frame->link);
+}
+/*
+ * buddy system functions (under construction)
+ *
+ */
+/** Allocate 2^order frames
+ *
+ */
+__address zone_buddy_frame_alloc(int flags, __u8 order) {
+    ipl_t ipl;
+    link_t *cur, *tmp;
+    zone_t *z;
+    zone_t *zone = NULL;
+    frame_t *frame = NULL;
+    __address v;
+loop:
+    ipl = interrupts_disable();
+    spinlock_lock(&zone_head_lock);
+    /*
+     * First, find suitable frame zone.
+     */
+    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
+        z = list_get_instance(cur, zone_t, link);
+        spinlock_lock(&z->lock);
+        /*
+         * Check if the zone has 2^order frames area available
+         * TODO: Must check if buddy system has at least block in order >= given order
+         */
+        if (z->free_count == (1 >> order)) {
+            zone = z;
+            break;
+        }
+        spinlock_unlock(&z->lock);
+    }
+    if (!zone) {
+        if (flags & FRAME_PANIC)
+            panic("Can't allocate frame.\n");
+        /*
+         * TODO: Sleep until frames are available again.
+         */
+        spinlock_unlock(&zone_head_lock);
+        interrupts_restore(ipl);
+        panic("Sleep not implemented.\n");
+        goto loop;
+    }
+    /* Allocate frames from zone buddy system */
+    cur = buddy_system_alloc(zone->buddy_system, order);
+    /* frame will be actually a first frame of the block */
+    frame = list_get_instance(cur, frame_t, buddy_link);
+    /* get frame address */
+    v = FRAME2ADDR(zone, frame);
+    if (flags & FRAME_KA)
+        v = PA2KA(v);
+    spinlock_unlock(&zone->lock);
+    spinlock_unlock(&zone_head_lock);
+    interrupts_restore(ipl);
+    return v;
+}
+/** Free frame(s)
+ *
+ * @param addr Address of the frame(s) to be freed. It must be a multiple of FRAME_SIZE.
+ */
+void zone_buddy_frame_free(__address addr)
+{
+    ipl_t ipl;
+    link_t *cur;
+    zone_t *z;
+    zone_t *zone = NULL;
+    frame_t *frame;
+    ASSERT(addr % FRAME_SIZE == 0);
+    ipl = interrupts_disable();
+    spinlock_lock(&zone_head_lock);
+    /*
+     * First, find host frame zone for addr.
+     */
+    for (cur = zone_head.next; cur != &zone_head; cur = cur->next) {
+        z = list_get_instance(cur, zone_t, link);
+        spinlock_lock(&z->lock);
+        if (IS_KA(addr))
+            addr = KA2PA(addr);
+        /*
+         * Check if addr belongs to z.
+         */
+        if ((addr >= z->base) && (addr <= z->base + (z->free_count + z->busy_count) * FRAME_SIZE)) {
+            zone = z;
+            break;
+        }
+        spinlock_unlock(&z->lock);
+    }
+    ASSERT(zone != NULL);
+    frame = ADDR2FRAME(zone, addr);
+    ASSERT(frame->refcount);
+    if (!--frame->refcount) {
+        buddy_system_free(zone->buddy_system, &frame->buddy_link);
+    }
+    spinlock_unlock(&zone->lock);
+    spinlock_unlock(&zone_head_lock);
+    interrupts_restore(ipl);
+}
+/** Buddy system find_buddy implementation
+ *
+ */
+link_t * zone_buddy_find_buddy(link_t * buddy) {
+}
+/** Buddy system bisect implementation
+ *
+ */
+link_t * zone_buddy_bisect(link_t * block) {
+}
+/** Buddy system coalesce implementation
+ *
+ */
+link_t * zone_buddy_coalesce(link_t * buddy_l, link_t * buddy_r) {
+}
+/** Buddy system set_order implementation
+ *
+ */
+void zone_buddy_set_order(link_t * block, __u8 order) {
+}
+/** Buddy system get_order implementation
+ *
+ */
+__u8 zone_buddy_get_order(link_t * block) {
+}

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/mm/frame.c @ 1780 – Rev 430 → 479