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Cortex-Axx: Unconditionally apply CPU reset operations

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In the Cortex-A35/A53/A57 CPUs library code, some of the CPU specific
reset operations are skipped if they have already been applied in a
previous invocation of the reset handler. This precaution is not
required, as all these operations can be reapplied safely.

This patch removes the unneeded test-before-set instructions in
the reset handler for these CPUs.

Change-Id: Ib175952c814dc51f1b5125f76ed6c06a22b95167
This commit is contained in:
Sandrine Bailleux 2016-01-29 14:37:58 +00:00
parent 54035fc467
commit c66fad93ca
3 changed files with 3 additions and 31 deletions

6
lib/cpus/aarch64/cortex_a35.S
View file

@ -67,16 +67,12 @@ endfunc cortex_a35_disable_smp
*/
func cortex_a35_reset_func
/* ---------------------------------------------
* As a bare minimum enable the SMP bit if it is
* not already set.
* Enable the SMP bit.
* ---------------------------------------------
*/
mrs x0, CORTEX_A35_CPUECTLR_EL1
tst x0, #CORTEX_A35_CPUECTLR_SMPEN_BIT
b.ne skip_smp_setup
orr x0, x0, #CORTEX_A35_CPUECTLR_SMPEN_BIT
msr CORTEX_A35_CPUECTLR_EL1, x0
skip_smp_setup:
isb
ret
endfunc cortex_a35_reset_func

6
lib/cpus/aarch64/cortex_a53.S
View file

@ -151,16 +151,12 @@ func cortex_a53_reset_func
#endif
/* ---------------------------------------------
* As a bare minimum enable the SMP bit if it is
* not already set.
* Enable the SMP bit.
* ---------------------------------------------
*/
mrs x0, CPUECTLR_EL1
tst x0, #CPUECTLR_SMP_BIT
b.ne skip_smp_setup
orr x0, x0, #CPUECTLR_SMP_BIT
msr CPUECTLR_EL1, x0
skip_smp_setup:
isb
ret x19
endfunc cortex_a53_reset_func

22
lib/cpus/aarch64/cortex_a57.S
View file

@ -105,17 +105,9 @@ func errata_a57_806969_wa
ret
#endif
apply_806969:
/*
* Test if errata has already been applied in an earlier
* invocation of the reset handler and does not need to
* be applied again.
*/
mrs x1, CPUACTLR_EL1
tst x1, #CPUACTLR_NO_ALLOC_WBWA
b.ne skip_806969
orr x1, x1, #CPUACTLR_NO_ALLOC_WBWA
msr CPUACTLR_EL1, x1
skip_806969:
ret
endfunc errata_a57_806969_wa
@ -139,17 +131,9 @@ func errata_a57_813420_wa
ret
#endif
apply_813420:
/*
* Test if errata has already been applied in an earlier
* invocation of the reset handler and does not need to
* be applied again.
*/
mrs x1, CPUACTLR_EL1
tst x1, #CPUACTLR_DCC_AS_DCCI
b.ne skip_813420
orr x1, x1, #CPUACTLR_DCC_AS_DCCI
msr CPUACTLR_EL1, x1
skip_813420:
ret
endfunc errata_a57_813420_wa
@ -216,16 +200,12 @@ func cortex_a57_reset_func
#endif
/* ---------------------------------------------
* As a bare minimum enable the SMP bit if it is
* not already set.
* Enable the SMP bit.
* ---------------------------------------------
*/
mrs x0, CPUECTLR_EL1
tst x0, #CPUECTLR_SMP_BIT
b.ne skip_smp_setup
orr x0, x0, #CPUECTLR_SMP_BIT
msr CPUECTLR_EL1, x0
skip_smp_setup:
isb
ret x19
endfunc cortex_a57_reset_func