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 <arch/types.h>
 #include <func.h>
 #include <mm/heap.h>
 #include <mm/frame.h>
 #include <mm/page.h>
 #include <mm/vm.h>
 #include <arch/mm/page.h>
 #include <config.h>
 #include <memstr.h>
 #include <panic.h>
+#include <debug.h>
 #include <synch/spinlock.h>
 #include <arch/asm.h>
 #include <arch.h>
 count_t frames = 0;
 count_t frames_free;
 __u8 *frame_bitmap;
 count_t frame_bitmap_octets;
 static spinlock_t framelock;
+spinlock_t zone_head_lock;       /**< this lock protects zone_head list */
+link_t zone_head;                /**< list of all zones in the system */
 void frame_init(void)
+{
     if (config.cpu_active == 1) {
+        zone_init();
         /*
          * The bootstrap processor will allocate all necessary memory for frame allocation.
          */
         frames = config.memory_size / FRAME_SIZE;
         frame_bitmap_octets = frames / 8 + (frames % 8 > 0);
         frame_bitmap = (__u8 *) malloc(frame_bitmap_octets);
         if (!frame_bitmap)
             panic("malloc/frame_bitmap\n");
         /*
          * Mark all frames free.
          */
         memsetb((__address) frame_bitmap, frame_bitmap_octets, 0);
         frames_free = frames;
+    }
     /*
      * No frame allocations/reservations prior this point.
      */
     frame_arch_init();
     if (config.cpu_active == 1) {
         /*
          * Create the memory address space map. Marked frames and frame
          * regions cannot be used for allocation.
          */
         frame_region_not_free(config.base, config.base + config.kernel_size);
+    }
+}
 /*
  * Allocate a frame.
  */
 __address frame_alloc(int flags)
+{
     int i;
     pri_t pri;
 loop:
     pri = cpu_priority_high();
     spinlock_lock(&framelock);
     if (frames_free) {
         for (i=0; i < frames; i++) {
             int m, n;
             m = i / 8;
             n = i % 8;
             if ((frame_bitmap[m] & (1<<n)) == 0) {
                 frame_bitmap[m] |= (1<<n);
                 frames_free--;
                 spinlock_unlock(&framelock);
                 cpu_priority_restore(pri);
                 if (flags & FRAME_KA) return PA2KA(i*FRAME_SIZE);
                 return i*FRAME_SIZE;
+            }
+        }
         panic("frames_free inconsistent (%d)\n", frames_free);
+    }
     spinlock_unlock(&framelock);
     cpu_priority_restore(pri);
     if (flags & FRAME_PANIC)
         panic("unable to allocate frame\n");
     /* TODO: implement sleeping logic here */
     panic("sleep not supported\n");
     goto loop;
+}
 /*
  * Free a frame.
  */
 void frame_free(__address addr)
+{
     pri_t pri;
     __u32 frame;
     pri = cpu_priority_high();
     spinlock_lock(&framelock);
     frame = IS_KA(addr) ? KA2PA(addr) : addr;
     frame /= FRAME_SIZE;
     if (frame < frames) {
         int m, n;
         m = frame / 8;
         n = frame % 8;
         if (frame_bitmap[m] & (1<<n)) {
             frame_bitmap[m] &= ~(1<<n);
             frames_free++;
+        }
         else panic("frame already free\n");
+    }
     else panic("frame number too big\n");
     spinlock_unlock(&framelock);
     cpu_priority_restore(pri);
+}
 /*
  * Don't use this function for normal allocation. Use frame_alloc() instead.
  * Use this function to declare that some special frame is not free.
  */
 void frame_not_free(__address addr)
+{
     pri_t pri;
     __u32 frame;
     pri = cpu_priority_high();
     spinlock_lock(&framelock);
     frame = IS_KA(addr) ? KA2PA(addr) : addr;
     frame /= FRAME_SIZE;
     if (frame < frames) {
         int m, n;
         m = frame / 8;
         n = frame % 8;
         if ((frame_bitmap[m] & (1<<n)) == 0) {
             frame_bitmap[m] |= (1<<n);
             frames_free--;
+        }
+    }
     spinlock_unlock(&framelock);
     cpu_priority_restore(pri);
+}
 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;
+    ASSERT(start % FRAME_SIZE == 0);
+    ASSERT(size % FRAME_SIZE == 0);
+    cnt = size / FRAME_SIZE;
+    z = (zone_t *) 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;
+        list_initialize(&z->busy_head);
+        z->frames = (frame_t *) malloc(cnt * sizeof(frame_t));
+        if (!z->frames) {
+            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);
+        }
+    }
+    return z;
+}
+/** Attach frame zone
+ *
+ * Attach frame zone to zone list.
+ *
+ * @param zone Zone to be attached.
+ */
+void zone_attach(zone_t *zone)
+{
+    pri_t pri;
+    pri = cpu_priority_high();
+    spinlock_lock(&zone_head_lock);
+    list_append(&zone->link, &zone_head);
+    spinlock_unlock(&zone_head_lock);
+    cpu_priority_restore(pri);
+}
+/** 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);
+    frame->zone = zone;
+}
+/** Get address of physical frame from its frame structure
+ *
+ * Get address of physical frame from its frame structure.
+ *
+ * @param frame Frame structure of the queried frame address.
+ *
+ * @return Address of frame associated with the argument.
+ */
+__address frame_get_address(frame_t *frame)
+{
+    __address v;
+    zone_t *z;
+    pri_t pri;
+    z = frame->zone;
+    pri = cpu_priority_high();
+    spinlock_lock(&z->lock);
+    v = z->base + (frame - z->frames) * FRAME_SIZE;
+    if (z->flags & FRAME_KA)
+        v = PA2KA(v);
+    spinlock_unlock(&z->lock);
+    cpu_priority_restore(pri);
+    return v;
+}

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(root)/kernel/trunk/generic/src/mm/frame.c @ 1757 – Rev 219 → 367