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fix(xlat_tables_v2): zeromem to clear all tables

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This patch replaces the for loops to sero individual tables or entries
in the translation table context with zeromem to improve the boot time.

On Tegra platforms, this patch has proved to save 10ms during boot.

Signed-off-by: Bhavesh Parekh <bparekh@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
Change-Id: Iea9fb2c18ae7a1aef4fe42c4151a321fb3f8660e
This commit is contained in:
Varun Wadekar 2025-02-27 17:03:56 +00:00
parent 1dd6f3ece6
commit aaacde4682
1 changed files with 6 additions and 8 deletions
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14
lib/xlat_tables_v2/xlat_tables_core.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2017-2024, Arm Limited and Contributors. All rights reserved.
* Copyright (c) 2017-2025, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -15,6 +15,7 @@
#include <arch_features.h>
#include <arch_helpers.h>
#include <common/debug.h>
#include <lib/utils.h>
#include <lib/utils_def.h>
#include <lib/xlat_tables/xlat_tables_defs.h>
#include <lib/xlat_tables/xlat_tables_v2.h>
@ -1204,16 +1205,13 @@ void __init init_xlat_tables_ctx(xlat_ctx_t *ctx)
xlat_mmap_print(mm);
/* All tables must be zeroed before mapping any region. */
zeromem(ctx->base_table, ctx->base_table_entries * sizeof(uint64_t));
for (unsigned int i = 0U; i < ctx->base_table_entries; i++)
ctx->base_table[i] = INVALID_DESC;
for (int j = 0; j < ctx->tables_num; j++) {
#if PLAT_XLAT_TABLES_DYNAMIC
ctx->tables_mapped_regions[j] = 0;
zeromem(ctx->tables_mapped_regions, ctx->tables_num * sizeof(uint32_t));
#endif
for (unsigned int i = 0U; i < XLAT_TABLE_ENTRIES; i++)
ctx->tables[j][i] = INVALID_DESC;
for (int i = 0; i < ctx->tables_num; i++) {
zeromem(ctx->tables[i], XLAT_TABLE_ENTRIES * sizeof(uint64_t));
}
while (mm->size != 0U) {