diff options
Diffstat (limited to 'plat/imx/common/imx8_helpers.S')
| -rw-r--r-- | plat/imx/common/imx8_helpers.S | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/plat/imx/common/imx8_helpers.S b/plat/imx/common/imx8_helpers.S new file mode 100644 index 0000000..19293bf --- /dev/null +++ b/plat/imx/common/imx8_helpers.S @@ -0,0 +1,125 @@ +/* + * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <asm_macros.S> +#include <platform_def.h> +#include <cortex_a35.h> + + .globl plat_is_my_cpu_primary + .globl plat_my_core_pos + .globl plat_calc_core_pos + .globl plat_reset_handler + .globl plat_get_my_entrypoint + .globl plat_secondary_cold_boot_setup + .globl plat_crash_console_init + .globl plat_crash_console_putc + .globl plat_crash_console_flush + .globl platform_mem_init + .globl imx_mailbox_init + + /* -------------------------------------------------------------------- + * Helper macro that reads the part number of the current CPU and jumps + * to the given label if it matches the CPU MIDR provided. + * + * Clobbers x0. + * -------------------------------------------------------------------- + */ + .macro jump_if_cpu_midr _cpu_midr, _label + + mrs x0, midr_el1 + ubfx x0, x0, MIDR_PN_SHIFT, #12 + cmp w0, #((\_cpu_midr >> MIDR_PN_SHIFT) & MIDR_PN_MASK) + b.eq \_label + + .endm + + /* ---------------------------------------------- + * The mailbox_base is used to distinguish warm/cold + * reset. The mailbox_base is in the data section, not + * in .bss, this allows function to start using this + * variable before the runtime memory is initialized. + * ---------------------------------------------- + */ + .section .data.mailbox_base + .align 3 + mailbox_base: .quad 0x0 + + /* ---------------------------------------------- + * unsigned int plat_is_my_cpu_primary(void); + * This function checks if this is the primary CPU + * ---------------------------------------------- + */ +func plat_is_my_cpu_primary + mrs x0, mpidr_el1 + and x0, x0, #(MPIDR_CPU_MASK) + cmp x0, #PLAT_PRIMARY_CPU + cset x0, eq + ret +endfunc plat_is_my_cpu_primary + + /* ---------------------------------------------- + * unsigned int plat_my_core_pos(void) + * This Function uses the plat_calc_core_pos() + * to get the index of the calling CPU. + * ---------------------------------------------- + */ +func plat_my_core_pos + mrs x0, mpidr_el1 + and x1, x0, #MPIDR_CPU_MASK + and x0, x0, #MPIDR_CLUSTER_MASK + add x0, x1, x0, LSR #6 + ret +endfunc plat_my_core_pos + + /* + * unsigned int plat_calc_core_pos(uint64_t mpidr) + * helper function to calculate the core position. + * With this function. + */ +func plat_calc_core_pos + and x1, x0, #MPIDR_CPU_MASK + and x0, x0, #MPIDR_CLUSTER_MASK + add x0, x1, x0, LSR #6 + ret +endfunc plat_calc_core_pos + + /* --------------------------------------------- + * function to get the entrypoint. + * --------------------------------------------- + */ +func plat_get_my_entrypoint + adrp x1, mailbox_base + ldr x0, [x1, :lo12:mailbox_base] + ret +endfunc plat_get_my_entrypoint + +func imx_mailbox_init + adrp x1, mailbox_base + str x0, [x1, :lo12:mailbox_base] + ret +endfunc imx_mailbox_init + +func plat_secondary_cold_boot_setup + b . +endfunc plat_secondary_cold_boot_setup + +func plat_crash_console_init + mov x0, #1 + ret +endfunc plat_crash_console_init + +func plat_crash_console_putc + ret +endfunc plat_crash_console_putc + +func plat_crash_console_flush + mov x0, #0 + ret +endfunc plat_crash_console_flush + +func platform_mem_init + ret +endfunc platform_mem_init |