1 files changed, 207 insertions, 0 deletions

diff --git a/sound/synth/util_mem.c b/sound/synth/util_mem.c
new file mode 100644
index 000000000000..8b131a11e549
--- /dev/null
+++ b/sound/synth/util_mem.c
@@ -0,0 +1,207 @@
+/*
+ *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
+ *
+ *  Generic memory management routines for soundcard memory allocation
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/util_mem.h>
+
+MODULE_AUTHOR("Takashi Iwai");
+MODULE_DESCRIPTION("Generic memory management routines for soundcard memory allocation");
+MODULE_LICENSE("GPL");
+
+#define get_memblk(p)   list_entry(p, snd_util_memblk_t, list)
+
+/*
+ * create a new memory manager
+ */
+snd_util_memhdr_t *
+snd_util_memhdr_new(int memsize)
+{
+        snd_util_memhdr_t *hdr;
+
+        hdr = kcalloc(1, sizeof(*hdr), GFP_KERNEL);
+        if (hdr == NULL)
+                return NULL;
+        hdr->size = memsize;
+        init_MUTEX(&hdr->block_mutex);
+        INIT_LIST_HEAD(&hdr->block);
+
+        return hdr;
+}
+
+/*
+ * free a memory manager
+ */
+void snd_util_memhdr_free(snd_util_memhdr_t *hdr)
+{
+        struct list_head *p;
+
+        snd_assert(hdr != NULL, return);
+        /* release all blocks */
+        while ((p = hdr->block.next) != &hdr->block) {
+                list_del(p);
+                kfree(get_memblk(p));
+        }
+        kfree(hdr);
+}
+
+/*
+ * allocate a memory block (without mutex)
+ */
+snd_util_memblk_t *
+__snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size)
+{
+        snd_util_memblk_t *blk;
+        snd_util_unit_t units, prev_offset;
+        struct list_head *p;
+
+        snd_assert(hdr != NULL, return NULL);
+        snd_assert(size > 0, return NULL);
+
+        /* word alignment */
+        units = size;
+        if (units & 1)
+                units++;
+        if (units > hdr->size)
+                return NULL;
+
+        /* look for empty block */
+        prev_offset = 0;
+        list_for_each(p, &hdr->block) {
+                blk = get_memblk(p);
+                if (blk->offset - prev_offset >= units)
+                        goto __found;
+                prev_offset = blk->offset + blk->size;
+        }
+        if (hdr->size - prev_offset < units)
+                return NULL;
+
+__found:
+        return __snd_util_memblk_new(hdr, units, p->prev);
+}
+
+
+/*
+ * create a new memory block with the given size
+ * the block is linked next to prev
+ */
+snd_util_memblk_t *
+__snd_util_memblk_new(snd_util_memhdr_t *hdr, snd_util_unit_t units,
+                      struct list_head *prev)
+{
+        snd_util_memblk_t *blk;
+
+        blk = kmalloc(sizeof(snd_util_memblk_t) + hdr->block_extra_size, GFP_KERNEL);
+        if (blk == NULL)
+                return NULL;
+
+        if (! prev || prev == &hdr->block)
+                blk->offset = 0;
+        else {
+                snd_util_memblk_t *p = get_memblk(prev);
+                blk->offset = p->offset + p->size;
+        }
+        blk->size = units;
+        list_add(&blk->list, prev);
+        hdr->nblocks++;
+        hdr->used += units;
+        return blk;
+}
+
+
+/*
+ * allocate a memory block (with mutex)
+ */
+snd_util_memblk_t *
+snd_util_mem_alloc(snd_util_memhdr_t *hdr, int size)
+{
+        snd_util_memblk_t *blk;
+        down(&hdr->block_mutex);
+        blk = __snd_util_mem_alloc(hdr, size);
+        up(&hdr->block_mutex);
+        return blk;
+}
+
+
+/*
+ * remove the block from linked-list and free resource
+ * (without mutex)
+ */
+void
+__snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk)
+{
+        list_del(&blk->list);
+        hdr->nblocks--;
+        hdr->used -= blk->size;
+        kfree(blk);
+}
+
+/*
+ * free a memory block (with mutex)
+ */
+int snd_util_mem_free(snd_util_memhdr_t *hdr, snd_util_memblk_t *blk)
+{
+        snd_assert(hdr && blk, return -EINVAL);
+
+        down(&hdr->block_mutex);
+        __snd_util_mem_free(hdr, blk);
+        up(&hdr->block_mutex);
+        return 0;
+}
+
+/*
+ * return available memory size
+ */
+int snd_util_mem_avail(snd_util_memhdr_t *hdr)
+{
+        unsigned int size;
+        down(&hdr->block_mutex);
+        size = hdr->size - hdr->used;
+        up(&hdr->block_mutex);
+        return size;
+}
+
+
+EXPORT_SYMBOL(snd_util_memhdr_new);
+EXPORT_SYMBOL(snd_util_memhdr_free);
+EXPORT_SYMBOL(snd_util_mem_alloc);
+EXPORT_SYMBOL(snd_util_mem_free);
+EXPORT_SYMBOL(snd_util_mem_avail);
+EXPORT_SYMBOL(__snd_util_mem_alloc);
+EXPORT_SYMBOL(__snd_util_mem_free);
+EXPORT_SYMBOL(__snd_util_memblk_new);
+
+/*
+ *  INIT part
+ */
+
+static int __init alsa_util_mem_init(void)
+{
+        return 0;
+}
+
+static void __exit alsa_util_mem_exit(void)
+{
+}
+
+module_init(alsa_util_mem_init)
+module_exit(alsa_util_mem_exit)