From 4c681a3d22f0018186d83d753be566965c0cf7a5 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Tue, 21 Apr 2015 07:18:29 +0200 Subject: 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 Signed-off-by: Jan Kiszka Reviewed-by: Tom Rini Reviewed-by: Thierry Reding Tested-by: Thierry Reding Tested-by: Ian Campbell Signed-off-by: Tom Warren --- arch/arm/cpu/armv7/psci.S | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/arm/cpu/armv7/psci.S') 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 -- cgit v1.2.1