From 4c681a3d22f0018186d83d753be566965c0cf7a5 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Tue, 21 Apr 2015 07:18:29 +0200 Subject: [PATCH] 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 ++++++++++++++ arch/arm/cpu/armv7/sunxi/psci.S | 15 +++++---------- 2 files changed, 19 insertions(+), 10 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 diff --git a/arch/arm/cpu/armv7/sunxi/psci.S b/arch/arm/cpu/armv7/sunxi/psci.S index 90dcff172c..dd583b2a94 100644 --- a/arch/arm/cpu/armv7/sunxi/psci.S +++ b/arch/arm/cpu/armv7/sunxi/psci.S @@ -241,17 +241,12 @@ psci_arch_init: mcr p15, 0, r5, c1, c1, 0 @ Write SCR isb - bl psci_get_cpu_id - mov r5, #0x400 @ 1kB of stack per CPU - mul r0, r0, r5 - - adr r5, text_end @ end of text - add r5, r5, #0x2000 @ Skip two pages - lsr r5, r5, #12 @ Align to start of page - lsl r5, r5, #12 - sub sp, r5, r0 @ here's our stack! + bl psci_get_cpu_id @ CPU ID => r0 + bl psci_get_cpu_stack_top @ stack top => r0 + mov sp, r0 bx r6 -text_end: + .globl psci_text_end +psci_text_end: .popsection -- 2.39.5