1/* 2 * Copyright (c) 2006-2018, Shanghai Real-Thread Technology Co., Ltd 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2009-01-20 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 bx 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 bx 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 tst lr, #0x01 43 beq _ARM_MODE 44 orr r4, r4, #0x20 @ it's thumb code 45 46_ARM_MODE: 47 stmfd sp!, {r4} @ push cpsr 48 49 str sp, [r0] @ store sp in preempted tasks TCB 50 ldr sp, [r1] @ get new task stack pointer 51 52 ldmfd sp!, {r4} @ pop new task cpsr to spsr 53 msr spsr_cxsf, r4 54 55 ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc, copy spsr to cpsr 56 57/* 58 * void rt_hw_context_switch_to(rt_uint32 to); 59 * r0 --> to 60 */ 61.globl rt_hw_context_switch_to 62rt_hw_context_switch_to: 63 ldr sp, [r0] @ get new task stack pointer 64 65 ldmfd sp!, {r4} @ pop new task spsr 66 msr spsr_cxsf, r4 67 68 bic r4, r4, #0x20 @ must be ARM mode 69 msr cpsr_cxsf, r4 70 71 ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc 72 73/* 74 * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to); 75 */ 76.globl rt_thread_switch_interrupt_flag 77.globl rt_interrupt_from_thread 78.globl rt_interrupt_to_thread 79.globl rt_hw_context_switch_interrupt 80rt_hw_context_switch_interrupt: 81 ldr r2, =rt_thread_switch_interrupt_flag 82 ldr r3, [r2] 83 cmp r3, #1 84 beq _reswitch 85 mov r3, #1 @ set rt_thread_switch_interrupt_flag to 1 86 str r3, [r2] 87 ldr r2, =rt_interrupt_from_thread @ set rt_interrupt_from_thread 88 str r0, [r2] 89_reswitch: 90 ldr r2, =rt_interrupt_to_thread @ set rt_interrupt_to_thread 91 str r1, [r2] 92 bx lr 93