| /* |
| * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <platform_def.h> |
| #include "../drivers/pwrc/fvp_pwrc.h" |
| #include "../fvp_def.h" |
| |
| .globl plat_secondary_cold_boot_setup |
| .globl plat_get_my_entrypoint |
| .globl plat_is_my_cpu_primary |
| |
| /* -------------------------------------------------------------------- |
| * void plat_secondary_cold_boot_setup (void); |
| * |
| * For AArch32, cold-booting secondary CPUs is not yet |
| * implemented and they panic. |
| * -------------------------------------------------------------------- |
| */ |
| func plat_secondary_cold_boot_setup |
| cb_panic: |
| b cb_panic |
| endfunc plat_secondary_cold_boot_setup |
| |
| /* --------------------------------------------------------------------- |
| * unsigned long plat_get_my_entrypoint (void); |
| * |
| * Main job of this routine is to distinguish between a cold and warm |
| * boot. On FVP, this information can be queried from the power |
| * controller. The Power Control SYS Status Register (PSYSR) indicates |
| * the wake-up reason for the CPU. |
| * |
| * For a cold boot, return 0. |
| * For a warm boot, read the mailbox and return the address it contains. |
| * |
| * TODO: PSYSR is a common register and should be |
| * accessed using locks. Since it is not possible |
| * to use locks immediately after a cold reset |
| * we are relying on the fact that after a cold |
| * reset all cpus will read the same WK field |
| * --------------------------------------------------------------------- |
| */ |
| func plat_get_my_entrypoint |
| /* --------------------------------------------------------------------- |
| * When bit PSYSR.WK indicates either "Wake by PPONR" or "Wake by GIC |
| * WakeRequest signal" then it is a warm boot. |
| * --------------------------------------------------------------------- |
| */ |
| ldcopr r2, MPIDR |
| ldr r1, =PWRC_BASE |
| str r2, [r1, #PSYSR_OFF] |
| ldr r2, [r1, #PSYSR_OFF] |
| ubfx r2, r2, #PSYSR_WK_SHIFT, #PSYSR_WK_WIDTH |
| cmp r2, #WKUP_PPONR |
| beq warm_reset |
| cmp r2, #WKUP_GICREQ |
| beq warm_reset |
| |
| /* Cold reset */ |
| mov r0, #0 |
| bx lr |
| |
| warm_reset: |
| /* --------------------------------------------------------------------- |
| * A mailbox is maintained in the trusted SRAM. It is flushed out of the |
| * caches after every update using normal memory so it is safe to read |
| * it here with SO attributes. |
| * --------------------------------------------------------------------- |
| */ |
| ldr r0, =PLAT_ARM_TRUSTED_MAILBOX_BASE |
| ldr r0, [r0] |
| cmp r0, #0 |
| beq _panic |
| bx lr |
| |
| /* --------------------------------------------------------------------- |
| * The power controller indicates this is a warm reset but the mailbox |
| * is empty. This should never happen! |
| * --------------------------------------------------------------------- |
| */ |
| _panic: |
| b _panic |
| endfunc plat_get_my_entrypoint |
| |
| /* ----------------------------------------------------- |
| * unsigned int plat_is_my_cpu_primary (void); |
| * |
| * Find out whether the current cpu is the primary |
| * cpu. |
| * ----------------------------------------------------- |
| */ |
| func plat_is_my_cpu_primary |
| ldcopr r0, MPIDR |
| ldr r1, =(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) |
| and r0, r1 |
| cmp r0, #FVP_PRIMARY_CPU |
| moveq r0, #1 |
| movne r0, #0 |
| bx lr |
| endfunc plat_is_my_cpu_primary |