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refactor(mpam): remove initialization of EL2 registers when EL2 is used

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The patch removes initialization of MPAM EL2 registers when an EL2
software exists. The patch assumes the EL2 software will perform
the necessary initializations of the registers.

Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
Change-Id: I5bed81bc22f417bc3e3cbbcd860a8553cd4307cd
This commit is contained in:
Zelalem Aweke 2022-02-02 15:29:13 -06:00 • committed by Joanna Farley
parent 2bbad1d126
commit fd5da7a847
1 changed files with 1 additions and 9 deletions
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10
lib/extensions/mpam/mpam.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2018-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -27,7 +27,6 @@ void mpam_enable(bool el2_unused)
/*
* If EL2 is implemented but unused, disable trapping to EL2 when lower
* ELs access their own MPAM registers.
* If EL2 is implemented and used, enable trapping to EL2.
*/
if (el2_unused) {
write_mpam2_el2(0ULL);
@ -35,12 +34,5 @@ void mpam_enable(bool el2_unused)
if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U) {
write_mpamhcr_el2(0ULL);
}
} else {
write_mpam2_el2(MPAM2_EL2_TRAPMPAM0EL1 |
MPAM2_EL2_TRAPMPAM1EL1);
if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U) {
write_mpamhcr_el2(MPAMHCR_EL2_TRAP_MPAMIDR_EL1);
}
}
}