u-boot/arch/arm/cpu/armv7/mx7/psci.S
Chen-Yu Tsai 6e6622de16 ARM: PSCI: Switch to per-CPU target PC storage in secure data section
Now that we have a secure data section and space to store per-CPU target
PC address, switch to it instead of storing the target PC on the stack.

Also save clobbered r4-r7 registers on the stack and restore them on
return in psci_cpu_on for Tegra, i.MX7, and LS102xA platforms.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2016-07-15 15:54:58 +02:00

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ArmAsm

#include <config.h>
#include <linux/linkage.h>
#include <asm/armv7.h>
#include <asm/arch-armv7/generictimer.h>
#include <asm/psci.h>
.pushsection ._secure.text, "ax"
.arch_extension sec
.globl psci_cpu_on
psci_cpu_on:
push {r4, r5, lr}
mov r4, r0
mov r5, r1
mov r0, r1
mov r1, r2
bl psci_save_target_pc
mov r0, r4
mov r1, r5
ldr r2, =psci_cpu_entry
bl imx_cpu_on
pop {r4, r5, pc}
.globl psci_cpu_off
psci_cpu_off:
bl psci_cpu_off_common
bl psci_get_cpu_id
bl imx_cpu_off
1: wfi
b 1b
.popsection