diff options
Diffstat (limited to 'plat/arm/css/common/aarch32')
| -rw-r--r-- | plat/arm/css/common/aarch32/css_helpers.S | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/plat/arm/css/common/aarch32/css_helpers.S b/plat/arm/css/common/aarch32/css_helpers.S new file mode 100644 index 0000000..d47e13d --- /dev/null +++ b/plat/arm/css/common/aarch32/css_helpers.S @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2016-2017, 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 <platform_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. + * --------------------------------------------------------------------- + */ +func plat_secondary_cold_boot_setup + /* TODO: Implement secondary CPU cold boot setup on CSS platforms */ +cb_panic: + b cb_panic +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 + ldr r0, =PLAT_ARM_TRUSTED_MAILBOX_BASE + ldr r0, [r0] + bx lr +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 r1, r0, #MPIDR_CPU_MASK + and r0, r0, #MPIDR_CLUSTER_MASK + eor r0, r0, #(1 << MPIDR_AFFINITY_BITS) // swap cluster order + add r0, r1, r0, LSR #6 + bx lr +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) + * ----------------------------------------------------- + */ +#if CSS_USE_SCMI_SDS_DRIVER +func plat_is_my_cpu_primary + mov r10, lr + bl plat_my_core_pos + mov r4, r0 + bl sds_get_primary_cpu_id + /* Check for error */ + mov r1, #0xffffffff + cmp r0, r1 + beq 1f + cmp r0, r4 + moveq r0, #1 + movne r0, #0 + bx r10 +1: + no_ret plat_panic_handler +endfunc plat_is_my_cpu_primary +#else +func plat_is_my_cpu_primary + mov r10, lr + bl plat_my_core_pos + ldr r1, =SCP_BOOT_CFG_ADDR + ldr r1, [r1] + ubfx r1, r1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \ + #PLAT_CSS_PRIMARY_CPU_BIT_WIDTH + cmp r0, r1 + moveq r0, #1 + movne r0, #0 + bx r10 +endfunc plat_is_my_cpu_primary +#endif |