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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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54 lines
1.3 KiB
ArmAsm
54 lines
1.3 KiB
ArmAsm
#include <lkmc.h>
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.global _start
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_start:
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/* Make all CPUs except CPU0 sleep by default. */
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mrs x0, mpidr_el1
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ands x0, x0, 3
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bne lkmc_cpu_not_0
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/* Load the vector table. */
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ldr x0, =lkmc_vector_table
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msr vbar_el1, x0
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/* https://cirosantilli.com/linux-kernel-module-cheat#aarch64-baremetal-neon-setup */
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/* CPACR_EL1.FPEN */
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mov x1, 0x3 << 20
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/* CPACR_EL1.ZEN */
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orr x1, x1, 0x3 << 16
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msr cpacr_el1, x1
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isb
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/* Prepare the stack for main, mandatory for C code. */
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ldr x0, =stack_top
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mov sp, x0
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/* https://cirosantilli.com/linux-kernel-module-cheat#magic-failure-string */
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adr x0, lkmc_baremetal_on_exit_callback
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bl on_exit
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/* Run main. */
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mov x0, 0
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bl main
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/* If main returns, exit. */
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bl exit
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LKMC_VECTOR_TABLE
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/* Default handler for exceptions. This is called after some basic
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* setup done on the initial handler. Since this is a weak symbol,
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* you can redefine it in your own example, and your definition
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* will take precedence. */
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LKMC_WEAK(lkmc_vector_trap_handler)
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ldr x0, =lkmc_vector_trap_handler_error_message
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bl puts
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bl abort
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lkmc_vector_trap_handler_error_message:
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.asciz "error: unexpected interrupt"
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/* Default action for CPUs besides the first one: sleep forever. */
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LKMC_WEAK(lkmc_cpu_not_0)
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wfe
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b lkmc_cpu_not_0
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