mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-25 19:21:35 +01:00
36 lines
672 B
ArmAsm
36 lines
672 B
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#arm-multicore */
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.global mystart
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mystart:
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/* Reset spinlock. */
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mov x0, #0
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ldr x1, =spinlock
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str x0, [x1]
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/* Read cpu id into x1. */
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mrs x1, mpidr_el1
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and x1, x1, #3
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cbz x1, 1f
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/* Only CPU 1 reaches this point and sets the spinlock. */
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mov x0, #1
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ldr x1, =spinlock
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str x0, [x1]
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b .
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1:
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/* Only CPU 0 reaches this point. */
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ldr x0, spinlock
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cbz x0, 1b
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/* Semihost exit. */
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mov x1, #0x26
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movk x1, #2, lsl #16
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str x1, [sp,#0]
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mov x0, #0
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str x0, [sp,#8]
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mov x1, sp
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mov w0, #0x18
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hlt 0xf000
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spinlock:
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.skip 8
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