fix(gpt_rme): rework delegating/undelegating sequence
The previous delegating/undelegating sequence was incorrect as per the
specification DDI0615, "Architecture Reference Manual Supplement, The
Realm Management Extension (RME), for Armv9-A" Sections A1.1.1 and
A1.1.2
Off topic:
- cleaning the gpt_is_gpi_valid and gpt_check_pass_overlap
Change-Id: Idb64d0a2e6204f1708951137062847938ab5e0ac
Signed-off-by: Robert Wakim <robert.wakim@arm.com>
diff --git a/lib/aarch64/cache_helpers.S b/lib/aarch64/cache_helpers.S
index d1f3847..6faf545 100644
--- a/lib/aarch64/cache_helpers.S
+++ b/lib/aarch64/cache_helpers.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2021, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -8,6 +8,7 @@
#include <asm_macros.S>
.globl flush_dcache_range
+ .globl flush_dcache_to_popa_range
.globl clean_dcache_range
.globl inv_dcache_range
.globl dcsw_op_louis
@@ -63,6 +64,35 @@
endfunc inv_dcache_range
+ /*
+ * On implementations with FEAT_MTE2,
+ * Root firmware must issue DC_CIGDPAPA instead of DC_CIPAPA ,
+ * in order to additionally clean and invalidate Allocation Tags
+ * associated with the affected locations.
+ *
+ * ------------------------------------------
+ * Clean+Invalidate by PA to POPA
+ * from base address till size.
+ * 'x0' = addr, 'x1' = size
+ * ------------------------------------------
+ */
+func flush_dcache_to_popa_range
+ /* Exit early if size is zero */
+ cbz x1, exit_loop_dc_cipapa
+ dcache_line_size x2, x3
+ sub x3, x2, #1
+ bic x0, x0, x3
+ add x1, x1, x0
+loop_dc_cipapa:
+ sys #6, c7, c14, #1, x0 /* DC CIPAPA,<Xt> */
+ add x0, x0, x2
+ cmp x0, x1
+ b.lo loop_dc_cipapa
+ dsb osh
+exit_loop_dc_cipapa:
+ ret
+endfunc flush_dcache_to_popa_range
+
/* ---------------------------------------------------------------
* Data cache operations by set/way to the level specified
*