diff options
| author | Andrew Thoelke <andrew.thoelke@arm.com> | 2014-04-28 12:32:02 +0100 |
|---|---|---|
| committer | Andrew Thoelke <andrew.thoelke@arm.com> | 2014-05-07 11:29:50 +0100 |
| commit | 7935d0a59d439c993b79814ab414d37e4a90d9a6 (patch) | |
| tree | b441893641316f785bf782b24ac8877252eb8afb /services/std_svc | |
| parent | 2f5dcfef1db42f3b073ae657f8a94925abecd768 (diff) | |
Access system registers directly in assembler
Instead of using the system register helper functions to read
or write system registers, assembler coded functions should
use MRS/MSR instructions. This results in faster and more
compact code.
This change replaces all usage of the helper functions with
direct register accesses.
Change-Id: I791d5f11f257010bb3e6a72c6c5ab8779f1982b3
Diffstat (limited to 'services/std_svc')
| -rw-r--r-- | services/std_svc/psci/psci_entry.S | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/services/std_svc/psci/psci_entry.S b/services/std_svc/psci/psci_entry.S index ec55a81..25adaa1 100644 --- a/services/std_svc/psci/psci_entry.S +++ b/services/std_svc/psci/psci_entry.S @@ -76,8 +76,7 @@ psci_aff_common_finish_entry: */ msr spsel, #0 - bl read_mpidr - mov x19, x0 + mrs x0, mpidr_el1 bl platform_set_coherent_stack /* --------------------------------------------- @@ -85,14 +84,14 @@ psci_aff_common_finish_entry: * level 0. * --------------------------------------------- */ - mov x0, x19 + mrs x0, mpidr_el1 bl get_power_on_target_afflvl cmp x0, xzr b.lt _panic mov x3, x23 mov x2, x0 - mov x0, x19 mov x1, #MPIDR_AFFLVL0 + mrs x0, mpidr_el1 blr x22 /* -------------------------------------------- @@ -100,7 +99,7 @@ psci_aff_common_finish_entry: * -IS-WBWA memory * -------------------------------------------- */ - mov x0, x19 + mrs x0, mpidr_el1 bl platform_set_stack zero_callee_saved_regs @@ -119,7 +118,7 @@ func __psci_cpu_off sub sp, sp, #0x10 stp x19, x20, [sp, #0] mov x19, sp - bl read_mpidr + mrs x0, mpidr_el1 bl platform_set_coherent_stack bl psci_cpu_off mov x1, #PSCI_E_SUCCESS @@ -140,7 +139,7 @@ func __psci_cpu_suspend mov x20, x0 mov x21, x1 mov x22, x2 - bl read_mpidr + mrs x0, mpidr_el1 bl platform_set_coherent_stack mov x0, x20 mov x1, x21 |