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ARM: Put target PC for PSCI CPU_ON on per-CPU stack 

Use a per-CPU variable for saving the target PC during CPU_ON
operations. This allows us to run this service independently on targets
that have more than 2 cores and also core-local power control.

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>
This commit is contained in:
Jan Kiszka 2015-04-21 07:18:30 +02:00 committed by Tom Warren
parent 4c681a3d22
commit 3317b988b1
2 changed files with 11 additions and 9 deletions
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11
arch/arm/cpu/armv7/psci.S
View File

@ -17,6 +17,7 @@
#include <config.h>
#include <linux/linkage.h>
#include <asm/macro.h>
#include <asm/psci.h>
.pushsection ._secure.text, "ax"
@ -202,6 +203,7 @@ ENTRY(psci_get_cpu_stack_top)
add r5, r5, #0x2000 @ Skip two pages
lsr r5, r5, #12 @ Align to start of page
lsl r5, r5, #12
sub r5, r5, #4 @ reserve 1 word for target PC
sub r0, r5, r0 @ here's our stack!
bx lr
@ -212,13 +214,10 @@ ENTRY(psci_cpu_entry)
bl _nonsec_init
adr r0, _psci_target_pc
ldr r0, [r0]
bl psci_get_cpu_id @ CPU ID => r0
bl psci_get_cpu_stack_top @ stack top => r0
ldr r0, [r0] @ target PC at stack top
b _do_nonsec_entry
ENDPROC(psci_cpu_entry)
.globl _psci_target_pc
_psci_target_pc:
.word 0
.popsection

9
arch/arm/cpu/armv7/sunxi/psci.S
View File

@ -139,8 +139,11 @@ out: mcr p15, 0, r7, c1, c1, 0
@ r2 = target PC
.globl psci_cpu_on
psci_cpu_on:
ldr r0, =_psci_target_pc
str r2, [r0]
push {lr}
mov r0, r1
bl psci_get_cpu_stack_top @ get stack top of target CPU
str r2, [r0] @ store target PC at stack top
dsb
movw r0, #(SUN7I_CPUCFG_BASE & 0xffff)
@ -195,7 +198,7 @@ psci_cpu_on:
str r6, [r0, #0x1e4]
mov r0, #ARM_PSCI_RET_SUCCESS @ Return PSCI_RET_SUCCESS
mov pc, lr
pop {pc}
.globl psci_cpu_off
psci_cpu_off: