diff options
Diffstat (limited to 'plat/qemu/aarch64/plat_helpers.S')
| -rw-r--r-- | plat/qemu/aarch64/plat_helpers.S | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/plat/qemu/aarch64/plat_helpers.S b/plat/qemu/aarch64/plat_helpers.S new file mode 100644 index 00000000..ed553795 --- /dev/null +++ b/plat/qemu/aarch64/plat_helpers.S @@ -0,0 +1,117 @@ +/* + * Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <asm_macros.S> +#include <assert_macros.S> +#include <platform_def.h> + + .globl plat_my_core_pos + .globl plat_get_my_entrypoint + .globl platform_mem_init + .globl plat_qemu_calc_core_pos + .globl plat_crash_console_init + .globl plat_crash_console_putc + .globl plat_secondary_cold_boot_setup + .globl plat_get_my_entrypoint + .globl plat_is_my_cpu_primary + + +func plat_my_core_pos + mrs x0, mpidr_el1 + b plat_qemu_calc_core_pos +endfunc plat_my_core_pos + +/* + * unsigned int plat_qemu_calc_core_pos(u_register_t mpidr); + * With this function: CorePos = (ClusterId * 4) + CoreId + */ +func plat_qemu_calc_core_pos + and x1, x0, #MPIDR_CPU_MASK + and x0, x0, #MPIDR_CLUSTER_MASK + add x0, x1, x0, LSR #6 + ret +endfunc plat_qemu_calc_core_pos + + /* ----------------------------------------------------- + * unsigned int plat_is_my_cpu_primary (void); + * + * Find out whether the current cpu is the primary + * cpu. + * ----------------------------------------------------- + */ +func plat_is_my_cpu_primary + mrs x0, mpidr_el1 + and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) + cmp x0, #QEMU_PRIMARY_CPU + cset w0, eq + ret +endfunc plat_is_my_cpu_primary + + /* ----------------------------------------------------- + * void plat_secondary_cold_boot_setup (void); + * + * This function performs any platform specific actions + * needed for a secondary cpu after a cold reset e.g + * mark the cpu's presence, mechanism to place it in a + * holding pen etc. + * ----------------------------------------------------- + */ +func plat_secondary_cold_boot_setup + /* Calculate address of our hold entry */ + bl plat_my_core_pos + lsl x0, x0, #PLAT_QEMU_HOLD_ENTRY_SHIFT + mov_imm x2, PLAT_QEMU_HOLD_BASE + + /* Wait until we have a go */ +poll_mailbox: + ldr x1, [x2, x0] + cbz x1, 1f + mov_imm x0, PLAT_QEMU_TRUSTED_MAILBOX_BASE + ldr x1, [x0] + br x1 +1: + wfe + b poll_mailbox +endfunc plat_secondary_cold_boot_setup + +func plat_get_my_entrypoint + /* TODO support warm boot */ + mov x0, #0 + ret +endfunc plat_get_my_entrypoint + +func platform_mem_init + ret +endfunc platform_mem_init + + /* --------------------------------------------- + * int plat_crash_console_init(void) + * Function to initialize the crash console + * without a C Runtime to print crash report. + * Clobber list : x0, x1, x2 + * --------------------------------------------- + */ +func plat_crash_console_init + mov_imm x0, PLAT_QEMU_CRASH_UART_BASE + mov_imm x1, PLAT_QEMU_CRASH_UART_CLK_IN_HZ + mov_imm x2, PLAT_QEMU_CONSOLE_BAUDRATE + b console_core_init +endfunc plat_crash_console_init + + /* --------------------------------------------- + * int plat_crash_console_putc(int c) + * Function to print a character on the crash + * console without a C Runtime. + * Clobber list : x1, x2 + * --------------------------------------------- + */ +func plat_crash_console_putc + mov_imm x1, PLAT_QEMU_CRASH_UART_BASE + b console_core_putc +endfunc plat_crash_console_putc + + |