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u-boot/arch/arm/cpu/armv7/psci.S
Tom Rini fc2240046c arm: Use the WEAK assembly entry point consistently 
It is a bad idea, and more modern toolchains will fail, if you declare
an assembly function to be global and then weak, instead of declaring it
weak to start with. Update assorted assembly files to use the WEAK macro
directly.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Pali Rohár <pali@kernel.org>
2022-12-06 15:30:30 -05:00

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ArmAsm
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/*
* 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/macro.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
WEAK(psci_fiq_enter)
movs pc, lr
ENDPROC(psci_fiq_enter)
WEAK(default_psci_vector)
movs pc, lr
ENDPROC(default_psci_vector)
WEAK(psci_version)
WEAK(psci_cpu_suspend)
WEAK(psci_cpu_off)
WEAK(psci_cpu_on)
WEAK(psci_affinity_info)
WEAK(psci_migrate)
WEAK(psci_migrate_info_type)
WEAK(psci_migrate_info_up_cpu)
WEAK(psci_system_off)
WEAK(psci_system_reset)
WEAK(psci_features)
WEAK(psci_cpu_freeze)
WEAK(psci_cpu_default_suspend)
WEAK(psci_node_hw_state)
WEAK(psci_system_suspend)
WEAK(psci_set_suspend_mode)
WEAK(psi_stat_residency)
WEAK(psci_stat_count)
mov r0, #ARM_PSCI_RET_NI @ Return -1 (Not Implemented)
mov pc, lr
ENDPROC(psci_stat_count)
ENDPROC(psi_stat_residency)
ENDPROC(psci_set_suspend_mode)
ENDPROC(psci_system_suspend)
ENDPROC(psci_node_hw_state)
ENDPROC(psci_cpu_default_suspend)
ENDPROC(psci_cpu_freeze)
ENDPROC(psci_features)
ENDPROC(psci_system_reset)
ENDPROC(psci_system_off)
ENDPROC(psci_migrate_info_up_cpu)
ENDPROC(psci_migrate_info_type)
ENDPROC(psci_migrate)
ENDPROC(psci_affinity_info)
ENDPROC(psci_cpu_on)
ENDPROC(psci_cpu_off)
ENDPROC(psci_cpu_suspend)
ENDPROC(psci_version)
_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 ARM_PSCI_0_2_FN_PSCI_VERSION
.word psci_version
.word ARM_PSCI_0_2_FN_CPU_SUSPEND
.word psci_cpu_suspend
.word ARM_PSCI_0_2_FN_CPU_OFF
.word psci_cpu_off
.word ARM_PSCI_0_2_FN_CPU_ON
.word psci_cpu_on
.word ARM_PSCI_0_2_FN_AFFINITY_INFO
.word psci_affinity_info
.word ARM_PSCI_0_2_FN_MIGRATE
.word psci_migrate
.word ARM_PSCI_0_2_FN_MIGRATE_INFO_TYPE
.word psci_migrate_info_type
.word ARM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU
.word psci_migrate_info_up_cpu
.word ARM_PSCI_0_2_FN_SYSTEM_OFF
.word psci_system_off
.word ARM_PSCI_0_2_FN_SYSTEM_RESET
.word psci_system_reset
.word ARM_PSCI_1_0_FN_PSCI_FEATURES
.word psci_features
.word ARM_PSCI_1_0_FN_CPU_FREEZE
.word psci_cpu_freeze
.word ARM_PSCI_1_0_FN_CPU_DEFAULT_SUSPEND
.word psci_cpu_default_suspend
.word ARM_PSCI_1_0_FN_NODE_HW_STATE
.word psci_node_hw_state
.word ARM_PSCI_1_0_FN_SYSTEM_SUSPEND
.word psci_system_suspend
.word ARM_PSCI_1_0_FN_SET_SUSPEND_MODE
.word psci_set_suspend_mode
.word ARM_PSCI_1_0_FN_STAT_RESIDENCY
.word psi_stat_residency
.word ARM_PSCI_1_0_FN_STAT_COUNT
.word psci_stat_count
.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
@ Requires dense and single-cluster CPU ID space
WEAK(psci_get_cpu_id)
mrc p15, 0, r0, c0, c0, 5 /* read MPIDR */
and r0, r0, #0xff /* return CPU ID in cluster */
bx lr
ENDPROC(psci_get_cpu_id)
/* Imported from Linux kernel */
ENTRY(psci_v7_flush_dcache_all)
stmfd sp!, {r4-r5, r7, r9-r11, lr}
dmb @ ensure ordering with previous memory accesses
mrc p15, 1, r0, c0, c0, 1 @ read clidr
ands r3, r0, #0x7000000 @ extract loc from clidr
mov r3, r3, lsr #23 @ left align loc bit field
beq finished @ if loc is 0, then no need to clean
mov r10, #0 @ start clean at cache level 0
flush_levels:
add r2, r10, r10, lsr #1 @ work out 3x current cache level
mov r1, r0, lsr r2 @ extract cache type bits from clidr
and r1, r1, #7 @ mask of the bits for current cache only
cmp r1, #2 @ see what cache we have at this level
blt skip @ skip if no cache, or just i-cache
mrs r9, cpsr @ make cssr&csidr read atomic
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
isb @ isb to sych the new cssr&csidr
mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
msr cpsr_c, r9
and r2, r1, #7 @ extract the length of the cache lines
add r2, r2, #4 @ add 4 (line length offset)
ldr r4, =0x3ff
ands r4, r4, r1, lsr #3 @ find maximum number on the way size
clz r5, r4 @ find bit position of way size increment
ldr r7, =0x7fff
ands r7, r7, r1, lsr #13 @ extract max number of the index size
loop1:
mov r9, r7 @ create working copy of max index
loop2:
orr r11, r10, r4, lsl r5 @ factor way and cache number into r11
orr r11, r11, r9, lsl r2 @ factor index number into r11
mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
subs r9, r9, #1 @ decrement the index
bge loop2
subs r4, r4, #1 @ decrement the way
bge loop1
skip:
add r10, r10, #2 @ increment cache number
cmp r3, r10
bgt flush_levels
finished:
mov r10, #0 @ swith back to cache level 0
mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
dsb st
isb
ldmfd sp!, {r4-r5, r7, r9-r11, lr}
bx lr
ENDPROC(psci_v7_flush_dcache_all)
WEAK(psci_disable_smp)
mrc p15, 0, r0, c1, c0, 1 @ ACTLR
bic r0, r0, #(1 << 6) @ Clear SMP bit
mcr p15, 0, r0, c1, c0, 1 @ ACTLR
isb
dsb
bx lr
ENDPROC(psci_disable_smp)
WEAK(psci_enable_smp)
mrc p15, 0, r0, c1, c0, 1 @ ACTLR
orr r0, r0, #(1 << 6) @ Set SMP bit
mcr p15, 0, r0, c1, c0, 1 @ ACTLR
isb
bx lr
ENDPROC(psci_enable_smp)
ENTRY(psci_cpu_off_common)
push {lr}
bl psci_v7_flush_dcache_all
clrex @ Why???
mrc p15, 0, r0, c1, c0, 0 @ SCTLR
bic r0, r0, #(1 << 2) @ Clear C bit
mcr p15, 0, r0, c1, c0, 0 @ SCTLR
isb
dsb
bl psci_v7_flush_dcache_all
clrex @ Why???
bl psci_disable_smp
pop {lr}
bx lr
ENDPROC(psci_cpu_off_common)
@ The stacks are allocated in reverse order, i.e.
@ the stack for CPU0 has the highest memory address.
@
@ -------------------- __secure_stack_end
@ | CPU0 target PC |
@ |------------------|
@ | |
@ | CPU0 stack |
@ | |
@ |------------------| __secure_stack_end - 1KB
@ | . |
@ | . |
@ | . |
@ | . |
@ -------------------- __secure_stack_start
@
@ This expects CPU ID in r0 and returns stack top in r0
LENTRY(psci_get_cpu_stack_top)
@ stack top = __secure_stack_end - (cpuid << ARM_PSCI_STACK_SHIFT)
ldr r3, =__secure_stack_end
sub r0, r3, r0, LSL #ARM_PSCI_STACK_SHIFT
sub r0, r0, #4 @ Save space for target PC
bx lr
ENDPROC(psci_get_cpu_stack_top)
@ {r0, r1, r2, ip} from _do_nonsec_entry(kernel_entry, 0, machid, r2) in
@ arch/arm/lib/bootm.c:boot_jump_linux() must remain unchanged across
@ this function.
ENTRY(psci_stack_setup)
mov r6, lr
mov r7, r0
bl psci_get_cpu_id @ CPU ID => r0
bl psci_get_cpu_stack_top @ stack top => r0
mov sp, r0
mov r0, r7
bx r6
ENDPROC(psci_stack_setup)
WEAK(psci_arch_init)
mov pc, lr
ENDPROC(psci_arch_init)
WEAK(psci_arch_cpu_entry)
mov pc, lr
ENDPROC(psci_arch_cpu_entry)
ENTRY(psci_cpu_entry)
bl psci_enable_smp
bl _nonsec_init
bl psci_stack_setup
bl psci_arch_cpu_entry
bl psci_get_cpu_id @ CPU ID => r0
mov r2, r0 @ CPU ID => r2
bl psci_get_context_id @ context id => r0
mov r1, r0 @ context id => r1
mov r0, r2 @ CPU ID => r0
bl psci_get_target_pc @ target PC => r0
b _do_nonsec_entry
ENDPROC(psci_cpu_entry)
.popsection
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