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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2017, EPAM Systems
* 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.
*
* 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 HOLDER 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 <optee_msg.h>
#include <stdio.h>
#include <types_ext.h>
#include <kernel/msg_param.h>
#include <mm/mobj.h>
/**
* msg_param_extract_pages() - extract list of pages from
* OPTEE_MSG_ATTR_NONCONTIG buffer.
*
* @buffer: pointer to parameters array
* @pages: output array of page addresses
* @num_pages: number of pages in array
*
* return:
* true on success, false otherwise
*
* @buffer points to the physical address of a structure that can be viewed as
*
* struct page_data {
* uint64_t pages_array[OPTEE_MSG_NONCONTIG_PAGE_SIZE/sizeof(uint64_t) - 1];
* uint64_t next_page_data;
* };
*
* So, it is a linked list of arrays, where each element of linked list fits
* exactly into one 4K page.
*
* This function extracts data from arrays into one array pointed by @pages
*
* @buffer points to data shared with normal world, so some precautions
* should be taken.
*/
static bool msg_param_extract_pages(paddr_t buffer, paddr_t *pages,
size_t num_pages)
{
size_t cnt;
struct mobj *mobj;
paddr_t page;
uint64_t *va;
bool ret = false;
if (buffer & SMALL_PAGE_MASK)
return false;
/*
* There we map first page of array.
* mobj_mapped_shm_alloc() will check if page resides in nonsec ddr
*/
mobj = mobj_mapped_shm_alloc(&buffer, 1, 0, 0);
if (!mobj)
return false;
va = mobj_get_va(mobj, 0);
assert(va);
for (cnt = 0; cnt < num_pages; cnt++, va++) {
/*
* If we about to roll over page boundary, then last entry holds
* address of next page of array. Unmap current page and map
* next one
*/
if (!((vaddr_t)(va + 1) & SMALL_PAGE_MASK)) {
page = *va;
if (page & SMALL_PAGE_MASK)
goto out;
mobj_free(mobj);
mobj = mobj_mapped_shm_alloc(&page, 1, 0, 0);
if (!mobj)
goto out;
va = mobj_get_va(mobj, 0);
assert(va);
}
pages[cnt] = *va;
if (pages[cnt] & SMALL_PAGE_MASK)
goto out;
}
ret = true;
out:
mobj_free(mobj);
return ret;
}
struct mobj *msg_param_mobj_from_noncontig(paddr_t buf_ptr, size_t size,
uint64_t shm_ref, bool map_buffer)
{
struct mobj *mobj = NULL;
paddr_t *pages;
paddr_t page_offset;
size_t num_pages;
page_offset = buf_ptr & SMALL_PAGE_MASK;
num_pages = (size + page_offset - 1) / SMALL_PAGE_SIZE + 1;
pages = malloc(num_pages * sizeof(paddr_t));
if (!pages)
return NULL;
if (!msg_param_extract_pages(buf_ptr & ~SMALL_PAGE_MASK,
pages, num_pages))
goto out;
if (map_buffer)
mobj = mobj_mapped_shm_alloc(pages, num_pages, page_offset,
shm_ref);
else
mobj = mobj_reg_shm_alloc(pages, num_pages, page_offset,
shm_ref);
out:
free(pages);
return mobj;
}
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