1/* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2006-03-13 Bernard first version 9 */ 10 11#define NOINT 0xc0 12 13/* 14 * rt_base_t rt_hw_interrupt_disable()/* 15 */ 16.globl rt_hw_interrupt_disable 17rt_hw_interrupt_disable: 18 mrs r0, cpsr 19 orr r1, r0, #NOINT 20 msr cpsr_c, r1 21 mov pc, lr 22 23/* 24 * void rt_hw_interrupt_enable(rt_base_t level)/* 25 */ 26.globl rt_hw_interrupt_enable 27rt_hw_interrupt_enable: 28 msr cpsr, r0 29 mov pc, lr 30 31/* 32 * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to)/* 33 * r0 --> from 34 * r1 --> to 35 */ 36.globl rt_hw_context_switch 37rt_hw_context_switch: 38 stmfd sp!, {lr} /* push pc (lr should be pushed in place of PC) */ 39 stmfd sp!, {r0-r12, lr} /* push lr & register file */ 40 41 mrs r4, cpsr 42 stmfd sp!, {r4} /* push cpsr */ 43 mrs r4, spsr 44 stmfd sp!, {r4} /* push spsr */ 45 46 str sp, [r0] /* store sp in preempted tasks TCB */ 47 ldr sp, [r1] /* get new task stack pointer */ 48 49 ldmfd sp!, {r4} /* pop new task spsr */ 50 msr spsr_cxsf, r4 51 ldmfd sp!, {r4} /* pop new task cpsr */ 52 msr cpsr_cxsf, r4 53 54 ldmfd sp!, {r0-r12, lr, pc} /* pop new task r0-r12, lr & pc */ 55 56/* 57 * void rt_hw_context_switch_to(rt_uint32 to)/* 58 * r0 --> to 59 */ 60.globl rt_hw_context_switch_to 61rt_hw_context_switch_to: 62 ldr sp, [r0] /* get new task stack pointer */ 63 64 ldmfd sp!, {r4} /* pop new task spsr */ 65 msr spsr_cxsf, r4 66 ldmfd sp!, {r4} /* pop new task cpsr */ 67 msr cpsr_cxsf, r4 68 69 ldmfd sp!, {r0-r12, lr, pc} /* pop new task r0-r12, lr & pc */ 70 71/* 72 * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to)/* 73 */ 74.globl rt_thread_switch_interrupt_flag 75.globl rt_interrupt_from_thread 76.globl rt_interrupt_to_thread 77.globl rt_hw_context_switch_interrupt 78rt_hw_context_switch_interrupt: 79 ldr r2, =rt_thread_switch_interrupt_flag 80 ldr r3, [r2] 81 cmp r3, #1 82 beq _reswitch 83 mov r3, #1 /* set rt_thread_switch_interrupt_flag to 1 */ 84 str r3, [r2] 85 ldr r2, =rt_interrupt_from_thread /* set rt_interrupt_from_thread */ 86 str r0, [r2] 87_reswitch: 88 ldr r2, =rt_interrupt_to_thread /* set rt_interrupt_to_thread */ 89 str r1, [r2] 90 mov pc, lr 91