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fix(errata): workaround for Rainier erratum 1868343 

Rainier CPU is based on Neoverse N1 R4P0 version which exhibits
the erratum 1868343. This patch inherits the workaround from
neoverse_n1.S file into rainier.S file for erratum 1868343.

Signed-off-by: Manoj Kumar <manoj.kumar3@arm.com>
Change-Id: I735595229716a77d26369943086de08384cafa70
This commit is contained in:
Manoj Kumar 2022-01-05 14:33:52 +00:00
parent f8183f4df1
commit a72144fb7a
1 changed files with 46 additions and 1 deletions
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47
lib/cpus/aarch64/rainier.S
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, Arm Limited. All rights reserved.
* Copyright (c) 2020-2022, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -41,6 +41,40 @@ func rainier_disable_speculative_loads
ret
endfunc rainier_disable_speculative_loads
/* --------------------------------------------------
* Errata Workaround for Neoverse N1 Errata #1868343.
* This applies to revision <= r4p0 of Neoverse N1.
* This workaround is the same as the workaround for
* errata 1262606 and 1275112 but applies to a wider
* revision range.
* Rainier R0P0 is based on Neoverse N1 R4P0 so the
* workaround checks for r0p0 version of Rainier CPU.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0, x1 & x17
* --------------------------------------------------
*/
func errata_n1_1868343_wa
/*
* Compare x0 against revision r4p0
*/
mov x17, x30
bl check_errata_1868343
cbz x0, 1f
mrs x1, RAINIER_CPUACTLR_EL1
orr x1, x1, RAINIER_CPUACTLR_EL1_BIT_13
msr RAINIER_CPUACTLR_EL1, x1
isb
1:
ret x17
endfunc errata_n1_1868343_wa
func check_errata_1868343
/* Applies to r0p0 of Rainier CPU */
mov x1, #0x00
b cpu_rev_var_ls
endfunc check_errata_1868343
func rainier_reset_func
mov x19, x30
@ -55,6 +89,11 @@ func rainier_reset_func
bl cpu_get_rev_var
mov x18, x0
#if ERRATA_N1_1868343
mov x0, x18
bl errata_n1_1868343_wa
#endif
#if ENABLE_AMU
/* Make sure accesses from EL0/EL1 and EL2 are not trapped to EL3 */
mrs x0, actlr_el3
@ -101,6 +140,12 @@ func rainier_errata_report
bl cpu_get_rev_var
mov x8, x0
/*
* Report all errata. The revision-variant information is passed to
* checking functions of each errata.
*/
report_errata ERRATA_N1_1868343, rainier, 1868343
ldp x8, x30, [sp], #16
ret
endfunc rainier_errata_report