diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2015-04-21 07:18:29 +0200 |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2015-05-13 09:24:14 -0700 |
| commit | 4c681a3d22f0018186d83d753be566965c0cf7a5 (patch) | |
| tree | d772ea9cb077179b11860c5da0da4536170ed5e3 /arch/arm/cpu/armv7/psci.S | |
| parent | 4ce4de1e6618340177eeb0914fc86054c6cc6dca (diff) | |
ARM: Factor out reusable psci_get_cpu_stack_top
This algorithm will be useful on Tegra as well, plus we will need it for
making _psci_target_pc per-CPU.
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>
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 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/psci.S b/arch/arm/cpu/armv7/psci.S index 7d89b43983..18d85c4d56 100644 --- a/arch/arm/cpu/armv7/psci.S +++ b/arch/arm/cpu/armv7/psci.S @@ -193,6 +193,20 @@ ENTRY(psci_cpu_off_common) bx lr ENDPROC(psci_cpu_off_common) +@ expects CPU ID in r0 and returns stack top in r0 +ENTRY(psci_get_cpu_stack_top) + mov r5, #0x400 @ 1kB of stack per CPU + mul r0, r0, r5 + + ldr r5, =psci_text_end @ end of monitor text + add r5, r5, #0x2000 @ Skip two pages + lsr r5, r5, #12 @ Align to start of page + lsl r5, r5, #12 + sub r0, r5, r0 @ here's our stack! + + bx lr +ENDPROC(psci_get_cpu_stack_top) + ENTRY(psci_cpu_entry) bl psci_enable_smp |