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/*
* Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <common/debug.h>
#include <lib/utils.h>
#include <lib/xlat_tables/xlat_tables_compat.h>
/*
* All the regions defined in mem_region_t must have the following properties
*
* - Any contiguous regions must be merged into a single entry.
* - The number of bytes of each region must be greater than zero.
* - The calculation of the highest address within the region (base + nbytes-1)
* doesn't produce an overflow.
*
* These conditions must be fulfilled by the caller and they aren't checked
* at runtime.
*/
/*
* zero_normalmem all the regions defined in tbl.
* It assumes that MMU is enabled and the memory is Normal memory.
* tbl must be a valid pointer to a memory mem_region_t array,
* nregions is the size of the array.
*/
void clear_mem_regions(mem_region_t *tbl, size_t nregions)
{
size_t i;
assert(tbl != NULL);
assert(nregions > 0U);
for (i = 0; i < nregions; i++) {
assert(tbl->nbytes > 0);
assert(!check_uptr_overflow(tbl->base, tbl->nbytes-1));
zero_normalmem((void *) (tbl->base), tbl->nbytes);
tbl++;
}
}
#if defined(PLAT_XLAT_TABLES_DYNAMIC)
/*
* zero_normalmem all the regions defined in regions.
* It assumes that MMU is enabled and the memory is Normal memory.
* regions must be a valid pointer to a memory mem_region_t array,
* nregions is the size of the array. va is the virtual address
* where we want to map the physical pages that are going to
* be cleared, and chunk is the amount of memory mapped and
* cleared in every iteration.
*/
void clear_map_dyn_mem_regions(struct mem_region *regions,
size_t nregions,
uintptr_t va,
size_t chunk)
{
uintptr_t begin;
int r;
size_t size;
const unsigned int attr = MT_MEMORY | MT_RW | MT_NS;
assert(regions != NULL);
assert(nregions != 0U);
assert(chunk != 0U);
for (unsigned int i = 0U; i < nregions; i++) {
begin = regions[i].base;
size = regions[i].nbytes;
if (((begin & (chunk-1U)) != 0U) ||
((size & (chunk-1U)) != 0U)) {
INFO("PSCI: Not correctly aligned region\n");
panic();
}
while (size > 0U) {
r = mmap_add_dynamic_region(begin, va, chunk, attr);
if (r != 0) {
INFO("PSCI: %s failed with %d\n",
"mmap_add_dynamic_region", r);
panic();
}
zero_normalmem((void *)va, chunk);
r = mmap_remove_dynamic_region(va, chunk);
if (r != 0) {
INFO("PSCI: %s failed with %d\n",
"mmap_remove_dynamic_region", r);
panic();
}
begin += chunk;
size -= chunk;
}
}
}
#endif
/*
* This function checks that a region (addr + nbytes-1) of memory is totally
* covered by one of the regions defined in tbl.
* tbl must be a valid pointer to a memory mem_region_t array, nregions
* is the size of the array and the region described by addr and nbytes must
* not generate an overflow.
* Returns:
* -1 means that the region is not covered by any of the regions
* described in tbl.
* 0 the region (addr + nbytes-1) is covered by one of the regions described
* in tbl
*/
int mem_region_in_array_chk(mem_region_t *tbl, size_t nregions,
uintptr_t addr, size_t nbytes)
{
uintptr_t region_start, region_end, start, end;
size_t i;
assert(tbl != NULL);
assert(nbytes != 0U);
assert(!check_uptr_overflow(addr, nbytes-1));
region_start = addr;
region_end = addr + (nbytes - 1U);
for (i = 0U; i < nregions; i++) {
assert(tbl->nbytes > 0);
assert(!check_uptr_overflow(tbl->base, tbl->nbytes-1));
start = tbl->base;
end = start + (tbl->nbytes - 1);
if ((region_start >= start) && (region_end <= end)) {
return 0;
}
tbl++;
}
return -1;
}
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