diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2015-04-21 07:18:26 +0200 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2015-05-13 09:24:13 -0700 |
| commit | 680f396851b7153f7f4243e1cc8875558b678add (patch) | |
| tree | a21e82f7e291391764c1ce5d58de208c3d84b1a6 /arch/arm/cpu/armv7/psci.S | |
| parent | 104d6fb6cd064c4c9278e5b6fdf99ac025597753 (diff) | |
ARM: Factor out common psci_get_cpu_id
Will be required for obtaining the ID of the current CPU in shared PSCI
functions. The default implementation requires a dense ID space and only
supports a single cluster. Therefore, the functions can be overloaded in
cases where these assumptions do not hold.
CC: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/cpu/armv7/psci.S')
| -rw-r--r-- | arch/arm/cpu/armv7/psci.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index bf11a34e54..12ad09b96c 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -99,4 +99,12 @@ _smc_psci: pop {r4-r7, lr} movs pc, lr @ Return to the kernel +@ Requires dense and single-cluster CPU ID space +ENTRY(psci_get_cpu_id) + mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */ + and r0, r0, #0xff /* return CPU ID in cluster */ + bx lr +ENDPROC(psci_get_cpu_id) +.weak psci_get_cpu_id + .popsection |