fef
fb9ec2a8bc
This is required because the heap is shared among all tasks and protected using a mutex which only works in kernel space.
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#include <ardix/device.h>
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#include <ardix/dma.h>
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#include <ardix/kent.h>
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#include <ardix/malloc.h>
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#include <ardix/types.h>
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#include <ardix/util.h>
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#include <stddef.h>
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static void dmabuf_destroy(struct kent *kent)
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{
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struct dmabuf *buf = kent_to_dmabuf(kent);
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kfree(buf);
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}
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struct dmabuf *dmabuf_create(struct device *dev, size_t len)
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{
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int err = 0;
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/*
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* allocation needs to be atomic because the buffer might be
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* free()d from within an irq handler which cannot sleep
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*/
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struct dmabuf *buf = atomic_kmalloc(sizeof(*buf) + len);
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if (buf == NULL)
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return NULL;
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buf->kent.parent = &dev->kent;
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buf->kent.destroy = dmabuf_destroy;
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err = kent_init(&buf->kent);
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if (err) {
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kfree(buf);
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return NULL;
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}
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buf->len = len;
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return buf;
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}
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void dmabuf_get(struct dmabuf *buf)
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{
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kent_get(&buf->kent);
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}
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void dmabuf_put(struct dmabuf *buf)
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{
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kent_put(&buf->kent);
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}
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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