45 lines
671 B
ArmAsm
45 lines
671 B
ArmAsm
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-04-29 Carl the first version
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*
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*/
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#include "rtconfig.h"
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.globl rt_hw_cpu_id
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rt_hw_cpu_id:
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mrc p15, 0, r0, c0, c0, 5
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ubfx r0, r0, #0, #12
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cmp r0, #0
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beq core0
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cmp r0, #1
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beq core1
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cmp r0, #256
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beq core2
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mov r1 ,#257
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cmp r0, r1
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beq core3
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b default
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core0:
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mov r0, #0
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b return
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core1:
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mov r0, #1
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b return
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core2:
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mov r0, #2
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b return
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core3:
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mov r0, #3
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b return
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default:
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and r0, r0, #15
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return:
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bx lr
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