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Diffstat (limited to '')
| -rw-r--r-- | lib/el3_runtime/aarch64/cpu_data.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/lib/el3_runtime/aarch64/cpu_data.S b/lib/el3_runtime/aarch64/cpu_data.S new file mode 100644 index 0000000..2392d6b --- /dev/null +++ b/lib/el3_runtime/aarch64/cpu_data.S @@ -0,0 +1,48 @@ +/* + * Copyright (c) 2014-2020, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <asm_macros.S> +#include <lib/el3_runtime/cpu_data.h> + +.globl init_cpu_data_ptr +.globl _cpu_data_by_index + +/* ----------------------------------------------------------------- + * void init_cpu_data_ptr(void) + * + * Initialise the TPIDR_EL3 register to refer to the cpu_data_t + * for the calling CPU. This must be called before cm_get_cpu_data() + * + * This can be called without a valid stack. It assumes that + * plat_my_core_pos() does not clobber register x10. + * clobbers: x0, x1, x10 + * ----------------------------------------------------------------- + */ +func init_cpu_data_ptr + mov x10, x30 + bl plat_my_core_pos + bl _cpu_data_by_index + msr tpidr_el3, x0 + ret x10 +endfunc init_cpu_data_ptr + +/* ----------------------------------------------------------------- + * cpu_data_t *_cpu_data_by_index(uint32_t cpu_index) + * + * Return the cpu_data structure for the CPU with given linear index + * + * This can be called without a valid stack. + * clobbers: x0, x1 + * ----------------------------------------------------------------- + */ +func _cpu_data_by_index + mov_imm x1, CPU_DATA_SIZE + mul x0, x0, x1 + adrp x1, percpu_data + add x1, x1, :lo12:percpu_data + add x0, x0, x1 + ret +endfunc _cpu_data_by_index |