mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-01 00:49:43 +00:00
ecf07a7930
Implement core support for PSCI. As this is generic code, it doesn't implement anything really useful (all the functions are returning Not Implemented). Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
102 lines
2.3 KiB
ArmAsm
102 lines
2.3 KiB
ArmAsm
/*
|
|
* Copyright (C) 2013,2014 - ARM Ltd
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/psci.h>
|
|
|
|
.pushsection ._secure.text, "ax"
|
|
|
|
.arch_extension sec
|
|
|
|
.align 5
|
|
.globl _psci_vectors
|
|
_psci_vectors:
|
|
b default_psci_vector @ reset
|
|
b default_psci_vector @ undef
|
|
b _smc_psci @ smc
|
|
b default_psci_vector @ pabort
|
|
b default_psci_vector @ dabort
|
|
b default_psci_vector @ hyp
|
|
b default_psci_vector @ irq
|
|
b psci_fiq_enter @ fiq
|
|
|
|
ENTRY(psci_fiq_enter)
|
|
movs pc, lr
|
|
ENDPROC(psci_fiq_enter)
|
|
.weak psci_fiq_enter
|
|
|
|
ENTRY(default_psci_vector)
|
|
movs pc, lr
|
|
ENDPROC(default_psci_vector)
|
|
.weak default_psci_vector
|
|
|
|
ENTRY(psci_cpu_suspend)
|
|
ENTRY(psci_cpu_off)
|
|
ENTRY(psci_cpu_on)
|
|
ENTRY(psci_migrate)
|
|
mov r0, #ARM_PSCI_RET_NI @ Return -1 (Not Implemented)
|
|
mov pc, lr
|
|
ENDPROC(psci_migrate)
|
|
ENDPROC(psci_cpu_on)
|
|
ENDPROC(psci_cpu_off)
|
|
ENDPROC(psci_cpu_suspend)
|
|
.weak psci_cpu_suspend
|
|
.weak psci_cpu_off
|
|
.weak psci_cpu_on
|
|
.weak psci_migrate
|
|
|
|
_psci_table:
|
|
.word ARM_PSCI_FN_CPU_SUSPEND
|
|
.word psci_cpu_suspend
|
|
.word ARM_PSCI_FN_CPU_OFF
|
|
.word psci_cpu_off
|
|
.word ARM_PSCI_FN_CPU_ON
|
|
.word psci_cpu_on
|
|
.word ARM_PSCI_FN_MIGRATE
|
|
.word psci_migrate
|
|
.word 0
|
|
.word 0
|
|
|
|
_smc_psci:
|
|
push {r4-r7,lr}
|
|
|
|
@ Switch to secure
|
|
mrc p15, 0, r7, c1, c1, 0
|
|
bic r4, r7, #1
|
|
mcr p15, 0, r4, c1, c1, 0
|
|
isb
|
|
|
|
adr r4, _psci_table
|
|
1: ldr r5, [r4] @ Load PSCI function ID
|
|
ldr r6, [r4, #4] @ Load target PC
|
|
cmp r5, #0 @ If reach the end, bail out
|
|
moveq r0, #ARM_PSCI_RET_INVAL @ Return -2 (Invalid)
|
|
beq 2f
|
|
cmp r0, r5 @ If not matching, try next entry
|
|
addne r4, r4, #8
|
|
bne 1b
|
|
|
|
blx r6 @ Execute PSCI function
|
|
|
|
@ Switch back to non-secure
|
|
2: mcr p15, 0, r7, c1, c1, 0
|
|
|
|
pop {r4-r7, lr}
|
|
movs pc, lr @ Return to the kernel
|
|
|
|
.popsection
|