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u-boot/arch/arm/cpu/armv8/psci.S
Lars Povlsen 25c07c72fd ARMv8: PSCI: Fix PSCI_TABLE relocation issue 
This fixes relaction isses with the PSCI_TABLE entries in
the psci_32_table and psci_64_table.

When using 32-bit adress pointers relocation was not being applied to
the tables, causing PSCI handlers to point to the un-relocated code
area. By using 64-bit data relocation is properly applied. The
handlers are thus in the "secure data" area, which is protected by
/memreserve/ in the FDT.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
2019-04-23 17:57:28 -04:00

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2016 Freescale Semiconductor, Inc.
* Author: Hongbo Zhang <hongbo.zhang@nxp.com>
* This file implements LS102X platform PSCI SYSTEM-SUSPEND function
*/
#include <config.h>
#include <linux/linkage.h>
#include <asm/psci.h>
#include <asm/secure.h>
/* Default PSCI function, return -1, Not Implemented */
#define PSCI_DEFAULT(__fn) \
ENTRY(__fn); \
mov w0, #ARM_PSCI_RET_NI; \
ret; \
ENDPROC(__fn); \
.weak __fn
/* PSCI function and ID table definition*/
#define PSCI_TABLE(__id, __fn) \
.quad __id; \
.quad __fn
.pushsection ._secure.text, "ax"
/* 32 bits PSCI default functions */
PSCI_DEFAULT(psci_version)
PSCI_DEFAULT(psci_cpu_suspend)
PSCI_DEFAULT(psci_cpu_off)
PSCI_DEFAULT(psci_cpu_on)
PSCI_DEFAULT(psci_affinity_info)
PSCI_DEFAULT(psci_migrate)
PSCI_DEFAULT(psci_migrate_info_type)
PSCI_DEFAULT(psci_migrate_info_up_cpu)
PSCI_DEFAULT(psci_system_off)
PSCI_DEFAULT(psci_system_reset)
PSCI_DEFAULT(psci_features)
PSCI_DEFAULT(psci_cpu_freeze)
PSCI_DEFAULT(psci_cpu_default_suspend)
PSCI_DEFAULT(psci_node_hw_state)
PSCI_DEFAULT(psci_system_suspend)
PSCI_DEFAULT(psci_set_suspend_mode)
PSCI_DEFAULT(psi_stat_residency)
PSCI_DEFAULT(psci_stat_count)
.align 3
_psci_32_table:
PSCI_TABLE(ARM_PSCI_FN_CPU_SUSPEND, psci_cpu_suspend)
PSCI_TABLE(ARM_PSCI_FN_CPU_OFF, psci_cpu_off)
PSCI_TABLE(ARM_PSCI_FN_CPU_ON, psci_cpu_on)
PSCI_TABLE(ARM_PSCI_FN_MIGRATE, psci_migrate)
PSCI_TABLE(ARM_PSCI_0_2_FN_PSCI_VERSION, psci_version)
PSCI_TABLE(ARM_PSCI_0_2_FN_CPU_SUSPEND, psci_cpu_suspend)
PSCI_TABLE(ARM_PSCI_0_2_FN_CPU_OFF, psci_cpu_off)
PSCI_TABLE(ARM_PSCI_0_2_FN_CPU_ON, psci_cpu_on)
PSCI_TABLE(ARM_PSCI_0_2_FN_AFFINITY_INFO, psci_affinity_info)
PSCI_TABLE(ARM_PSCI_0_2_FN_MIGRATE, psci_migrate)
PSCI_TABLE(ARM_PSCI_0_2_FN_MIGRATE_INFO_TYPE, psci_migrate_info_type)
PSCI_TABLE(ARM_PSCI_0_2_FN_MIGRATE_INFO_UP_CPU, psci_migrate_info_up_cpu)
PSCI_TABLE(ARM_PSCI_0_2_FN_SYSTEM_OFF, psci_system_off)
PSCI_TABLE(ARM_PSCI_0_2_FN_SYSTEM_RESET, psci_system_reset)
PSCI_TABLE(ARM_PSCI_1_0_FN_PSCI_FEATURES, psci_features)
PSCI_TABLE(ARM_PSCI_1_0_FN_CPU_FREEZE, psci_cpu_freeze)
PSCI_TABLE(ARM_PSCI_1_0_FN_CPU_DEFAULT_SUSPEND, psci_cpu_default_suspend)
PSCI_TABLE(ARM_PSCI_1_0_FN_NODE_HW_STATE, psci_node_hw_state)
PSCI_TABLE(ARM_PSCI_1_0_FN_SYSTEM_SUSPEND, psci_system_suspend)
PSCI_TABLE(ARM_PSCI_1_0_FN_SET_SUSPEND_MODE, psci_set_suspend_mode)
PSCI_TABLE(ARM_PSCI_1_0_FN_STAT_RESIDENCY, psi_stat_residency)
PSCI_TABLE(ARM_PSCI_1_0_FN_STAT_COUNT, psci_stat_count)
PSCI_TABLE(0, 0)
/* 64 bits PSCI default functions */
PSCI_DEFAULT(psci_cpu_suspend_64)
PSCI_DEFAULT(psci_cpu_on_64)
PSCI_DEFAULT(psci_affinity_info_64)
PSCI_DEFAULT(psci_migrate_64)
PSCI_DEFAULT(psci_migrate_info_up_cpu_64)
PSCI_DEFAULT(psci_cpu_default_suspend_64)
PSCI_DEFAULT(psci_node_hw_state_64)
PSCI_DEFAULT(psci_system_suspend_64)
PSCI_DEFAULT(psci_stat_residency_64)
PSCI_DEFAULT(psci_stat_count_64)
.align 3
_psci_64_table:
PSCI_TABLE(ARM_PSCI_0_2_FN64_CPU_SUSPEND, psci_cpu_suspend_64)
PSCI_TABLE(ARM_PSCI_0_2_FN64_CPU_ON, psci_cpu_on_64)
PSCI_TABLE(ARM_PSCI_0_2_FN64_AFFINITY_INFO, psci_affinity_info_64)
PSCI_TABLE(ARM_PSCI_0_2_FN64_MIGRATE, psci_migrate_64)
PSCI_TABLE(ARM_PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU, psci_migrate_info_up_cpu_64)
PSCI_TABLE(ARM_PSCI_1_0_FN64_CPU_DEFAULT_SUSPEND, psci_cpu_default_suspend_64)
PSCI_TABLE(ARM_PSCI_1_0_FN64_NODE_HW_STATE, psci_node_hw_state_64)
PSCI_TABLE(ARM_PSCI_1_0_FN64_SYSTEM_SUSPEND, psci_system_suspend_64)
PSCI_TABLE(ARM_PSCI_1_0_FN64_STAT_RESIDENCY, psci_stat_residency_64)
PSCI_TABLE(ARM_PSCI_1_0_FN64_STAT_COUNT, psci_stat_count_64)
PSCI_TABLE(0, 0)
.macro psci_enter
/* PSCI call is Fast Call(atomic), so mask DAIF */
mrs x15, DAIF
stp x15, xzr, [sp, #-16]!
ldr x15, =0x3C0
msr DAIF, x15
/* SMC convention, x18 ~ x30 should be saved by callee */
stp x29, x30, [sp, #-16]!
stp x27, x28, [sp, #-16]!
stp x25, x26, [sp, #-16]!
stp x23, x24, [sp, #-16]!
stp x21, x22, [sp, #-16]!
stp x19, x20, [sp, #-16]!
mrs x15, elr_el3
stp x18, x15, [sp, #-16]!
.endm
.macro psci_return
/* restore registers */
ldp x18, x15, [sp], #16
msr elr_el3, x15
ldp x19, x20, [sp], #16
ldp x21, x22, [sp], #16
ldp x23, x24, [sp], #16
ldp x25, x26, [sp], #16
ldp x27, x28, [sp], #16
ldp x29, x30, [sp], #16
/* restore DAIF */
ldp x15, xzr, [sp], #16
msr DAIF, x15
eret
.endm
/* Caller must put PSCI function-ID table base in x9 */
handle_psci:
psci_enter
1: ldr x10, [x9] /* Load PSCI function table */
cbz x10, 3f /* If reach the end, bail out */
cmp x10, x0
b.eq 2f /* PSCI function found */
add x9, x9, #16 /* If not match, try next entry */
b 1b
2: ldr x11, [x9, #8] /* Load PSCI function */
blr x11 /* Call PSCI function */
psci_return
3: mov x0, #ARM_PSCI_RET_NI
psci_return
/*
* Handle SiP service functions defined in SiP service function table.
* Use DECLARE_SECURE_SVC(_name, _id, _fn) to add platform specific SiP
* service function into the SiP service function table.
* SiP service function table is located in '._secure_svc_tbl_entries' section,
* which is next to '._secure.text' section.
*/
handle_svc:
adr x9, __secure_svc_tbl_start
adr x10, __secure_svc_tbl_end
subs x12, x10, x9 /* Get number of entries in table */
b.eq 2f /* Make sure SiP function table is not empty */
psci_enter
1: ldr x10, [x9] /* Load SiP function table */
ldr x11, [x9, #8]
cmp w10, w0
b.eq 2b /* SiP service function found */
add x9, x9, #SECURE_SVC_TBL_OFFSET /* Move to next entry */
subs x12, x12, #SECURE_SVC_TBL_OFFSET
b.eq 3b /* If reach the end, bail out */
b 1b
2: ldr x0, =0xFFFFFFFF
eret
handle_smc32:
/* SMC function ID 0x84000000-0x8400001F: 32 bits PSCI */
ldr w9, =0x8400001F
cmp w0, w9
b.gt handle_svc
ldr w9, =0x84000000
cmp w0, w9
b.lt handle_svc
adr x9, _psci_32_table
b handle_psci
handle_smc64:
/* check SMC32 or SMC64 calls */
ubfx x9, x0, #30, #1
cbz x9, handle_smc32
/* SMC function ID 0xC4000000-0xC400001F: 64 bits PSCI */
ldr x9, =0xC400001F
cmp x0, x9
b.gt handle_svc
ldr x9, =0xC4000000
cmp x0, x9
b.lt handle_svc
adr x9, _psci_64_table
b handle_psci
/*
* Get CPU ID from MPIDR, suppose every cluster has same number of CPU cores,
* Platform with asymmetric clusters should implement their own interface.
* In case this function being called by other platform's C code, the ARM
* Architecture Procedure Call Standard is considered, e.g. register X0 is
* used for the return value, while in this PSCI environment, X0 usually holds
* the SMC function identifier, so X0 should be saved by caller function.
*/
ENTRY(psci_get_cpu_id)
#ifdef CONFIG_ARMV8_PSCI_CPUS_PER_CLUSTER
mrs x9, MPIDR_EL1
ubfx x9, x9, #8, #8
ldr x10, =CONFIG_ARMV8_PSCI_CPUS_PER_CLUSTER
mul x9, x10, x9
#else
mov x9, xzr
#endif
mrs x10, MPIDR_EL1
ubfx x10, x10, #0, #8
add x0, x10, x9
ret
ENDPROC(psci_get_cpu_id)
.weak psci_get_cpu_id
/* CPU ID input in x0, stack top output in x0*/
LENTRY(psci_get_cpu_stack_top)
adr x9, __secure_stack_end
lsl x0, x0, #ARM_PSCI_STACK_SHIFT
sub x0, x9, x0
ret
ENDPROC(psci_get_cpu_stack_top)
unhandled_exception:
b unhandled_exception /* simply dead loop */
handle_sync:
mov x15, x30
mov x14, x0
bl psci_get_cpu_id
bl psci_get_cpu_stack_top
mov x9, #1
msr spsel, x9
mov sp, x0
mov x0, x14
mov x30, x15
mrs x9, esr_el3
ubfx x9, x9, #26, #6
cmp x9, #0x13
b.eq handle_smc32
cmp x9, #0x17
b.eq handle_smc64
b unhandled_exception
#ifdef CONFIG_ARMV8_EA_EL3_FIRST
/*
* Override this function if custom error handling is
* needed for asynchronous aborts
*/
ENTRY(plat_error_handler)
ret
ENDPROC(plat_error_handler)
.weak plat_error_handler
handle_error:
bl psci_get_cpu_id
bl psci_get_cpu_stack_top
mov x9, #1
msr spsel, x9
mov sp, x0
bl plat_error_handler /* Platform specific error handling */
deadloop:
b deadloop /* Never return */
#endif
.align 11
.globl el3_exception_vectors
el3_exception_vectors:
b unhandled_exception /* Sync, Current EL using SP0 */
.align 7
b unhandled_exception /* IRQ, Current EL using SP0 */
.align 7
b unhandled_exception /* FIQ, Current EL using SP0 */
.align 7
b unhandled_exception /* SError, Current EL using SP0 */
.align 7
b unhandled_exception /* Sync, Current EL using SPx */
.align 7
b unhandled_exception /* IRQ, Current EL using SPx */
.align 7
b unhandled_exception /* FIQ, Current EL using SPx */
.align 7
b unhandled_exception /* SError, Current EL using SPx */
.align 7
b handle_sync /* Sync, Lower EL using AArch64 */
.align 7
b unhandled_exception /* IRQ, Lower EL using AArch64 */
.align 7
b unhandled_exception /* FIQ, Lower EL using AArch64 */
.align 7
#ifdef CONFIG_ARMV8_EA_EL3_FIRST
b handle_error /* SError, Lower EL using AArch64 */
#else
b unhandled_exception /* SError, Lower EL using AArch64 */
#endif
.align 7
b unhandled_exception /* Sync, Lower EL using AArch32 */
.align 7
b unhandled_exception /* IRQ, Lower EL using AArch32 */
.align 7
b unhandled_exception /* FIQ, Lower EL using AArch32 */
.align 7
b unhandled_exception /* SError, Lower EL using AArch32 */
ENTRY(psci_setup_vectors)
adr x0, el3_exception_vectors
msr vbar_el3, x0
ret
ENDPROC(psci_setup_vectors)
ENTRY(psci_arch_init)
ret
ENDPROC(psci_arch_init)
.weak psci_arch_init
.popsection
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