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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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 Hyra 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/param.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <vm/pmap.h>
#include <vm/map.h>
#include <vm/vm.h>
/*
* Create/destroy virtual memory mappings in a specific
* address space.
*
* @vas: Address space.
* @va: Virtual address.
* @pa: Physical address (zero if `unmap` is true)
* @prot: Protection flags (zero if `unmap` is true)
* @unmap: True to unmap.
* @count: Count of bytes to be mapped which is aligned to the
* machine's page granularity.
*
* Returns 0 on success. On failure, this routine
* returns a less than zero value or greater than zero
* value that contains the offset into the memory where the
* mapping failed.
*/
static int
vm_map_modify(struct vas vas, vaddr_t va, paddr_t pa, vm_prot_t prot, bool unmap,
size_t count)
{
size_t misalign = va & (DEFAULT_PAGESIZE - 1);
int s;
if (count == 0) {
return -EINVAL;
}
/* Ensure we fully span pages */
count = ALIGN_UP(count + misalign, DEFAULT_PAGESIZE);
va = ALIGN_DOWN(va, DEFAULT_PAGESIZE);
pa = ALIGN_DOWN(pa, DEFAULT_PAGESIZE);
for (uintptr_t i = 0; i < count; i += DEFAULT_PAGESIZE) {
/* See if we should map or unmap the range */
if (unmap) {
s = pmap_unmap(vas, va + i);
} else {
s = pmap_map(vas, va + i, pa + i, prot);
}
if (s != 0) {
/* Something went wrong, return the offset */
return i;
}
}
return 0;
}
/*
* Create a virtual memory mapping in a specific
* address space.
*
* @vas: Address space.
* @va: Virtual address.
* @pa: Physical address.
* @prot: Protection flags.
* @count: Count of bytes to be mapped (aligned to page granularity).
*
* Returns 0 on success, and a less than zero errno
* on failure.
*/
int
vm_map(struct vas vas, vaddr_t va, paddr_t pa, vm_prot_t prot, size_t count)
{
int retval;
va = ALIGN_UP(va, DEFAULT_PAGESIZE);
retval = vm_map_modify(vas, va, pa, prot, false, count);
/* Return on success */
if (retval == 0)
return 0;
/* Failure, clean up */
for (int i = 0; i < retval; i += DEFAULT_PAGESIZE) {
pmap_unmap(vas, va + i);
}
return -1;
}
/*
* Unmap a virtual memory mapping in a specific
* address space.
*
* @vas: Address space.
* @va: Virtual address to start unmapping at.
* @count: Bytes to unmap (aligned to page granularity)
*/
int
vm_unmap(struct vas vas, vaddr_t va, size_t count)
{
return vm_map_modify(vas, va, 0, 0, true, count);
}
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