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54 lines
1.6 KiB
ArmAsm
54 lines
1.6 KiB
ArmAsm
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2021 Andre Richter <andre.o.richter@gmail.com>
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//--------------------------------------------------------------------------------------------------
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// Definitions
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//--------------------------------------------------------------------------------------------------
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.equ _core_id_mask, 0b11
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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.section .text._start
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//------------------------------------------------------------------------------
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// fn _start()
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//------------------------------------------------------------------------------
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_start:
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// Only proceed on the boot core. Park it otherwise.
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mrs x1, MPIDR_EL1
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and x1, x1, _core_id_mask
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ldr x2, BOOT_CORE_ID // provided by bsp/__board_name__/cpu.rs
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cmp x1, x2
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b.ne 2f
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// If execution reaches here, it is the boot core.
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// Next, relocate the binary.
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adr x0, __binary_nonzero_start // The address the binary got loaded to.
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ldr x1, =__binary_nonzero_start // The address the binary was linked to.
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ldr x2, =__binary_nonzero_end_exclusive
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1: ldr x3, [x0], #8
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str x3, [x1], #8
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cmp x1, x2
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b.lo 1b
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// Set the stack pointer.
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ldr x0, =__boot_core_stack_end_exclusive
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mov sp, x0
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// Jump to the relocated Rust code.
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ldr x1, =_start_rust
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br x1
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// Infinitely wait for events (aka "park the core").
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2: wfe
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b 2b
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.size _start, . - _start
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.type _start, function
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.global _start
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