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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
#ifndef _DMA_ALLOC_H_
#define _DMA_ALLOC_H_
#include <sys/types.h>
#include <sys/cdefs.h>
#include <vm/vm.h>
/*
* Represents a physical address that may be used
* with direct memory access
*/
typedef uintptr_t dma_addr_t;
/*
* Convert virtual DMA pages to physical DMA
* addresses.
*/
__always_inline static dma_addr_t
dma_get_pa(void *pgbuf)
{
return VIRT_TO_PHYS(pgbuf);
}
__always_inline static void *
dma_get_va(dma_addr_t pa)
{
return PHYS_TO_VIRT(pa);
}
/*
* Allocate a buffer suitable for Direct Memory
* Access
*
* @npages: Number of pages to allocate
*
* Returns a pointer to the buffer base on success, otherwise a value
* of NULL on failure.
*/
void *dma_alloc_pg(size_t npages);
#endif /* !_DMA_ALLOC_H_ */
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