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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 <vm/map.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/panic.h>
#include <lib/assert.h>
/*
* Internal routine for cleaning up.
*
* @va: VA to start unmapping at.
* @bytes_aligned: Amount of bytes to unmap.
*
* XXX DANGER!!: `bytes_aligned' is expected to be aligned by the
* machine's page granule. If this is not so,
* undefined behaviour will occur. This will
* be enforced via a panic.
*/
static void
vm_map_cleanup(struct vm_ctx *ctx, vaddr_t va, size_t bytes_aligned,
size_t granule)
{
__assert(bytes_aligned != 0);
__assert((bytes_aligned & (granule - 1)) == 0);
for (size_t i = 0; i < bytes_aligned; i += 0x1000) {
if (pmap_unmap(ctx, va + i) != 0) {
/*
* XXX: This shouldn't happen... If it somehow does,
* then this should be handled.
*/
panic("Could not cleanup!!!\n");
}
}
}
/*
* Create a virtual memory mappings in the current
* address space.
*
* @va: Virtual address.
* @pa: Physical address.
* @prot: Protection flags.
* @bytes: Amount of bytes to be mapped. This is aligned by the
* machine's page granule, typically a 4k boundary.
*/
int
vm_map_create(vaddr_t va, paddr_t pa, vm_prot_t prot, size_t bytes)
{
size_t granule = vm_get_page_size();
int s;
/*
* TODO: This needs to be changed, once vm_get_ctx()
* is no longer used, we'll need to fetch it from
* the current process!
*/
struct vm_ctx *ctx = vm_get_ctx();
/* We want bytes to be aligned by the granule */
bytes = __ALIGN_UP(bytes, granule);
/*
* The VA and PA must be aligned by the granule as well.
* However, it is a terrible idea to do this ourselves
* as that could introduce very hard to find bugs...
* If one of them aren't aligned, the caller most likely
* screwed something up and silently continuing would be
* a terrible thing! The offset of the addresses should be 0,
* i.e., we should be at the very beginning of the page.
*/
if ((va & (granule - 1)) != 0) {
return -1;
}
if ((pa & (granule - 1)) != 0) {
return -1;
}
if (bytes == 0) {
/* You can't map 0 pages, silly! */
return -1;
}
for (uintptr_t i = 0; i < bytes; i += granule) {
s = pmap_map(ctx, va + i, pa + i, prot);
if (s != 0) {
/* Something went a bit wrong here, cleanup */
vm_map_cleanup(ctx, va, i, bytes);
return -1;
}
}
return 0;
}
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