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revert(cpus): "Revert workaround for A77 erratum 1800714"

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Reinstate the workaround introduced in commit
9bbc03a6e0. The cited change to the SDEN
could not be found and there are no known problems with the workaround.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: Iec9938f173e7565024aca798f224df339de90806
This commit is contained in:
Boyan Karatotev 2022-09-27 10:37:54 +01:00
parent c19116dd61
commit 08e2fdbd3b
4 changed files with 48 additions and 1 deletions
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3
docs/design/cpu-specific-build-macros.rst
View file

@ -273,6 +273,9 @@ For Cortex-A77, the following errata build flags are defined :
- ``ERRATA_A77_2356587``: This applies errata 2356587 workaround to Cortex-A77
CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.
- ``ERRATA_A77_1800714``: This applies errata 1800714 workaround to Cortex-A77
CPU. This needs to be enabled for revisions <= r1p1 of the CPU.
For Cortex-A78, the following errata build flags are defined :
- ``ERRATA_A78_1688305``: This applies errata 1688305 workaround to Cortex-A78

1
include/lib/cpus/aarch64/cortex_a77.h
View file

@ -20,6 +20,7 @@
******************************************************************************/
#define CORTEX_A77_CPUECTLR_EL1 S3_0_C15_C1_4
#define CORTEX_A77_CPUECTLR_EL1_BIT_8 (ULL(1) << 8)
#define CORTEX_A77_CPUECTLR_EL1_BIT_53 (ULL(1) << 53)
/*******************************************************************************
* CPU Power Control register specific definitions.

37
lib/cpus/aarch64/cortex_a77.S
View file

@ -236,6 +236,35 @@ func check_errata_cve_2022_23960
ret
endfunc check_errata_cve_2022_23960
/* --------------------------------------------------
* Errata Workaround for Cortex A77 Errata #1800714.
* This applies to revision <= r1p1 of Cortex A77.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0-x17
* --------------------------------------------------
*/
func errata_a77_1800714_wa
/* Compare x0 against revision <= r1p1 */
mov x17, x30
bl check_errata_1800714
cbz x0, 1f
/* Disable allocation of splintered pages in the L2 TLB */
mrs x1, CORTEX_A77_CPUECTLR_EL1
orr x1, x1, CORTEX_A77_CPUECTLR_EL1_BIT_53
msr CORTEX_A77_CPUECTLR_EL1, x1
isb
1:
ret x17
endfunc errata_a77_1800714_wa
func check_errata_1800714
/* Applies to everything <= r1p1 */
mov x1, #0x11
b cpu_rev_var_ls
endfunc check_errata_1800714
/* -------------------------------------------------
* The CPU Ops reset function for Cortex-A77.
* Shall clobber: x0-x19
@ -280,6 +309,11 @@ func cortex_a77_reset_func
msr vbar_el3, x0
#endif /* IMAGE_BL31 && WORKAROUND_CVE_2022_23960 */
#if ERRATA_A77_1800714
mov x0, x18
bl errata_a77_1800714_wa
#endif
isb
ret x19
endfunc cortex_a77_reset_func
@ -315,9 +349,10 @@ func cortex_a77_errata_report
* checking functions of each errata.
*/
report_errata ERRATA_A77_1508412, cortex_a77, 1508412
report_errata ERRATA_A77_1791578, cortex_a77, 1791578
report_errata ERRATA_A77_1800714, cortex_a77, 1800714
report_errata ERRATA_A77_1925769, cortex_a77, 1925769
report_errata ERRATA_A77_1946167, cortex_a77, 1946167
report_errata ERRATA_A77_1791578, cortex_a77, 1791578
report_errata ERRATA_A77_2356587, cortex_a77, 2356587
report_errata WORKAROUND_CVE_2022_23960, cortex_a77, cve_2022_23960

8
lib/cpus/cpu-ops.mk
View file

@ -307,6 +307,10 @@ ERRATA_A77_1791578 ?=0
# to revisions r0p0, r1p0, and r1p1, it is still open.
ERRATA_A77_2356587 ?=0
# Flag to apply erratum 1800714 workaround during reset. This erratum applies
# to revisions <= r1p1 of the Cortex A77 cpu.
ERRATA_A77_1800714 ?=0
# Flag to apply erratum 1688305 workaround during reset. This erratum applies
# to revisions r0p0 - r1p0 of the A78 cpu.
ERRATA_A78_1688305 ?=0
@ -912,6 +916,10 @@ $(eval $(call add_define,ERRATA_A77_1791578))
$(eval $(call assert_boolean,ERRATA_A77_2356587))
$(eval $(call add_define,ERRATA_A77_2356587))
# Process ERRATA_A77_1800714 flag
$(eval $(call assert_boolean,ERRATA_A77_1800714))
$(eval $(call add_define,ERRATA_A77_1800714))
# Process ERRATA_A78_1688305 flag
$(eval $(call assert_boolean,ERRATA_A78_1688305))
$(eval $(call add_define,ERRATA_A78_1688305))