blob: 0cf8f86bbae2b5e2463da921173d9bc762e134ae [file] [log] [blame]
/*
* Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <arch.h>
#include <asm_macros.S>
#include <cpu_macros.S>
#include <css_def.h>
.weak plat_secondary_cold_boot_setup
.weak plat_get_my_entrypoint
.globl css_calc_core_pos_swap_cluster
.weak plat_is_my_cpu_primary
/* ---------------------------------------------------------------------
* void plat_secondary_cold_boot_setup(void);
*
* In the normal boot flow, cold-booting secondary CPUs is not yet
* implemented and they panic.
*
* When booting an EL3 payload, secondary CPUs are placed in a holding
* pen, waiting for their mailbox to be populated. Note that all CPUs
* share the same mailbox ; therefore, populating it will release all
* CPUs from their holding pen. If finer-grained control is needed then
* this should be handled in the code that secondary CPUs jump to.
* ---------------------------------------------------------------------
*/
func plat_secondary_cold_boot_setup
#ifndef EL3_PAYLOAD_BASE
/* TODO: Implement secondary CPU cold boot setup on CSS platforms */
cb_panic:
b cb_panic
#else
mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE
/* Wait until the mailbox gets populated */
poll_mailbox:
ldr x1, [x0]
cbz x1, 1f
br x1
1:
wfe
b poll_mailbox
#endif /* EL3_PAYLOAD_BASE */
endfunc plat_secondary_cold_boot_setup
/* ---------------------------------------------------------------------
* uintptr_t plat_get_my_entrypoint (void);
*
* Main job of this routine is to distinguish between a cold and a warm
* boot. On CSS platforms, this distinction is based on the contents of
* the Trusted Mailbox. It is initialised to zero by the SCP before the
* AP cores are released from reset. Therefore, a zero mailbox means
* it's a cold reset.
*
* This functions returns the contents of the mailbox, i.e.:
* - 0 for a cold boot;
* - the warm boot entrypoint for a warm boot.
* ---------------------------------------------------------------------
*/
func plat_get_my_entrypoint
mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE
ldr x0, [x0]
ret
endfunc plat_get_my_entrypoint
/* -----------------------------------------------------------
* unsigned int css_calc_core_pos_swap_cluster(u_register_t mpidr)
* Utility function to calculate the core position by
* swapping the cluster order. This is necessary in order to
* match the format of the boot information passed by the SCP
* and read in plat_is_my_cpu_primary below.
* -----------------------------------------------------------
*/
func css_calc_core_pos_swap_cluster
and x1, x0, #MPIDR_CPU_MASK
and x0, x0, #MPIDR_CLUSTER_MASK
eor x0, x0, #(1 << MPIDR_AFFINITY_BITS) // swap cluster order
add x0, x1, x0, LSR #6
ret
endfunc css_calc_core_pos_swap_cluster
/* -----------------------------------------------------
* unsigned int plat_is_my_cpu_primary (void);
*
* Find out whether the current cpu is the primary
* cpu (applicable ony after a cold boot)
* -----------------------------------------------------
*/
func plat_is_my_cpu_primary
mov x9, x30
bl plat_my_core_pos
ldr x1, =SCP_BOOT_CFG_ADDR
ldr x1, [x1]
ubfx x1, x1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \
#PLAT_CSS_PRIMARY_CPU_BIT_WIDTH
cmp x0, x1
cset w0, eq
ret x9
endfunc plat_is_my_cpu_primary