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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.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/syslog.h>
#include <io/dma/alloc.h>
#include <vm/physseg.h>
#include <vm/mmu.h>
#include <vm/map.h>
#include <vm/vm.h>
#include <string.h>
/*
* Allocate DMA pages
*/
void *
dma_alloc_pg(size_t npages)
{
const size_t PSIZE = DEFAULT_PAGESIZE;
struct vm_vas vas;
struct mmu_map spec;
size_t length;
int error, prot;
void *buf = NULL;
paddr_t pa;
if ((pa = vm_alloc_frame(npages)) == 0) {
return NULL;
}
spec.pa = pa;
spec.va = pa;
length = DEFAULT_PAGESIZE * npages;
/* Try to get the current VAS */
error = mmu_this_vas(&vas);
if (error < 0) {
goto done;
}
/* Map the region */
prot = PROT_READ | PROT_WRITE;
error = vm_map(&vas, &spec, length, prot);
if (error < 0) {
goto done;
}
buf = (void *)spec.va;
memset(buf, 0, npages * PSIZE);
done:
return buf;
}
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