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 * 2006-09-06 XuXinming first version 9 */ 10 11/*! 12 * \addtogroup S3C44B0 13 */ 14/*@{*/ 15 16#define NOINT 0xc0 17 18/* 19 * rt_base_t rt_hw_interrupt_disable(); 20 */ 21.globl rt_hw_interrupt_disable 22rt_hw_interrupt_disable: 23 mrs r0, cpsr 24 orr r1, r0, #NOINT 25 msr cpsr_c, r1 26 mov pc, lr 27 28/* 29 * void rt_hw_interrupt_enable(rt_base_t level); 30 */ 31.globl rt_hw_interrupt_enable 32rt_hw_interrupt_enable: 33 msr cpsr, r0 34 mov pc, lr 35 36/* 37 * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to); 38 * r0 --> from 39 * r1 --> to 40 */ 41.globl rt_hw_context_switch 42rt_hw_context_switch: 43 stmfd sp!, {lr} @ push pc (lr should be pushed in place of PC) 44 stmfd sp!, {r0-r12, lr} @ push lr & register file 45 46 mrs r4, cpsr 47 stmfd sp!, {r4} @ push cpsr 48 mrs r4, spsr 49 stmfd sp!, {r4} @ push spsr 50 51 str sp, [r0] @ store sp in preempted tasks TCB 52 ldr sp, [r1] @ get new task stack pointer 53 54 ldmfd sp!, {r4} @ pop new task spsr 55 msr spsr_cxsf, r4 56 ldmfd sp!, {r4} @ pop new task cpsr 57 msr cpsr_cxsf, r4 58 59 ldmfd sp!, {r0-r12, lr, pc} @ pop new task r0-r12, lr & pc 60 61/* 62 * void rt_hw_context_switch_to(rt_uint32 to); 63 * r0 --> to 64 */ 65.globl rt_hw_context_switch_to 66rt_hw_context_switch_to: 67 ldr sp, [r0] @ get new task stack pointer 68 69 ldmfd sp!, {r4} @ pop new task spsr 70 msr spsr_cxsf, r4 71 ldmfd sp!, {r4} @ pop new task cpsr 72 msr cpsr_cxsf, r4 73 74 ldmfd sp!, {r0-r12, lr, pc} @ pop new task r0-r12, lr & pc 75 76/* 77 * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to); 78 */ 79.globl rt_thread_switch_interrupt_flag 80.globl rt_interrupt_from_thread 81.globl rt_interrupt_to_thread 82.globl rt_hw_context_switch_interrupt 83rt_hw_context_switch_interrupt: 84 ldr r2, =rt_thread_switch_interrupt_flag 85 ldr r3, [r2] 86 cmp r3, #1 87 beq _reswitch 88 mov r3, #1 @ set rt_thread_switch_interrupt_flag to 1 89 str r3, [r2] 90 ldr r2, =rt_interrupt_from_thread @ set rt_interrupt_from_thread 91 str r0, [r2] 92_reswitch: 93 ldr r2, =rt_interrupt_to_thread @ set rt_interrupt_to_thread 94 str r1, [r2] 95 mov pc, lr 96