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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/errno.h>
#include <sys/syslog.h>
#include <vm/physseg.h>
#include <vm/mmu.h>
#include <vm/map.h>
#include <vm/vm.h>
/*
* Create a virtual to physical memory
* mapping
*/
static int
__vm_map(struct vm_vas *vas, struct mmu_map *spec, size_t len, int prot)
{
const size_t PSIZE = DEFAULT_PAGESIZE;
vaddr_t va_cur, va_end;
vaddr_t va_start;
int error;
if (vas == NULL || spec == NULL) {
return -EINVAL;
}
if (len == 0) {
return -EINVAL;
}
/* Must be 4K aligned */
len = ALIGN_UP(len, PSIZE);
/*
* If we encounter any address that is zero, we
* must assign our own.
*/
if (spec->pa == 0 || spec->va == 0) {
spec->pa = vm_alloc_frame(len / PSIZE);
if (spec->va == 0)
spec->va = spec->pa;
}
if (spec->pa == 0) {
return -ENOMEM;
}
/* Must be on a 4K boundary */
spec->va = ALIGN_DOWN(spec->va, PSIZE);
spec->pa = ALIGN_DOWN(spec->pa, PSIZE);
/*
* start: always the mapping base
* cur: current pointer sliding around
* end: region end
*/
va_start = spec->va;
va_cur = spec->va;
va_end = spec->va + len;
while (va_cur < va_end) {
error = mmu_map_single(vas, spec, prot);
if (error < 0) {
return spec->va;
}
va_cur += PSIZE;
spec->va += PSIZE;
spec->pa += PSIZE;
}
return 0;
}
int
vm_map(struct vm_vas *vas, struct mmu_map *spec, size_t len, int prot)
{
int retval;
size_t unmap_len;
struct mmu_map spec_cpy;
if (spec != NULL) {
spec_cpy = *spec;
}
/* If this fails, unmap the partial region */
retval = __vm_map(vas, spec, len, prot);
if (retval != 0) {
printf("vm_map: could not map <%p>\n", spec_cpy.va);
unmap_len = retval - spec_cpy.va;
__vm_map(vas, &spec_cpy, unmap_len, 0);
return -1;
}
/* Place a guard page at the end */
spec->va = spec_cpy.va + len;
__vm_map(vas, spec, DEFAULT_PAGESIZE, 0);
return 0;
}
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