1*10465441SEvalZero;/* 2*10465441SEvalZero; * Copyright (c) 2006-2018, RT-Thread Development Team 3*10465441SEvalZero; * 4*10465441SEvalZero; * SPDX-License-Identifier: Apache-2.0 5*10465441SEvalZero; * 6*10465441SEvalZero; * Change Logs: 7*10465441SEvalZero; * Date Author Notes 8*10465441SEvalZero; * 2011-08-14 weety copy from mini2440 9*10465441SEvalZero; */ 10*10465441SEvalZero 11*10465441SEvalZero#define NOINT 0xC0 12*10465441SEvalZero 13*10465441SEvalZero;/* 14*10465441SEvalZero; * rt_base_t rt_hw_interrupt_disable(); 15*10465441SEvalZero; */ 16*10465441SEvalZero .globl rt_hw_interrupt_disable 17*10465441SEvalZerort_hw_interrupt_disable: 18*10465441SEvalZero MRS R0, CPSR 19*10465441SEvalZero ORR R1, R0, #NOINT 20*10465441SEvalZero MSR CPSR_c, R1 21*10465441SEvalZero BX LR 22*10465441SEvalZero 23*10465441SEvalZero/* 24*10465441SEvalZero * void rt_hw_interrupt_enable(rt_base_t level); 25*10465441SEvalZero */ 26*10465441SEvalZero .globl rt_hw_interrupt_enable 27*10465441SEvalZerort_hw_interrupt_enable: 28*10465441SEvalZero MSR CPSR, R0 29*10465441SEvalZero BX LR 30*10465441SEvalZero 31*10465441SEvalZero/* 32*10465441SEvalZero * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to); 33*10465441SEvalZero * r0 --> from 34*10465441SEvalZero * r1 --> to 35*10465441SEvalZero */ 36*10465441SEvalZero .globl rt_hw_context_switch 37*10465441SEvalZerort_hw_context_switch: 38*10465441SEvalZero STMFD SP!, {LR} @; push pc (lr should be pushed in place of pc) 39*10465441SEvalZero STMFD SP!, {R0-R12, LR} @; push lr & register file 40*10465441SEvalZero MRS R4, CPSR 41*10465441SEvalZero STMFD SP!, {R4} @; push cpsr 42*10465441SEvalZero STR SP, [R0] @; store sp in preempted tasks tcb 43*10465441SEvalZero LDR SP, [R1] @; get new task stack pointer 44*10465441SEvalZero LDMFD SP!, {R4} @; pop new task spsr 45*10465441SEvalZero MSR SPSR_cxsf, R4 46*10465441SEvalZero LDMFD SP!, {R0-R12, LR, PC}^ @; pop new task r0-r12, lr & pc 47*10465441SEvalZero 48*10465441SEvalZero/* 49*10465441SEvalZero * void rt_hw_context_switch_to(rt_uint32 to); 50*10465441SEvalZero * r0 --> to 51*10465441SEvalZero */ 52*10465441SEvalZero .globl rt_hw_context_switch_to 53*10465441SEvalZerort_hw_context_switch_to: 54*10465441SEvalZero LDR SP, [R0] @; get new task stack pointer 55*10465441SEvalZero LDMFD SP!, {R4} @; pop new task cpsr 56*10465441SEvalZero MSR SPSR_cxsf, R4 57*10465441SEvalZero LDMFD SP!, {R0-R12, LR, PC}^ @; pop new task r0-r12, lr & pc 58*10465441SEvalZero 59*10465441SEvalZero/* 60*10465441SEvalZero * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to); 61*10465441SEvalZero */ 62*10465441SEvalZero .globl rt_thread_switch_interrupt_flag 63*10465441SEvalZero .globl rt_interrupt_from_thread 64*10465441SEvalZero .globl rt_interrupt_to_thread 65*10465441SEvalZero .globl rt_hw_context_switch_interrupt 66*10465441SEvalZerort_hw_context_switch_interrupt: 67*10465441SEvalZero LDR R2, =rt_thread_switch_interrupt_flag 68*10465441SEvalZero LDR R3, [R2] 69*10465441SEvalZero CMP R3, #1 70*10465441SEvalZero BEQ _reswitch 71*10465441SEvalZero MOV R3, #1 @; set flag to 1 72*10465441SEvalZero STR R3, [R2] 73*10465441SEvalZero LDR R2, =rt_interrupt_from_thread @; set rt_interrupt_from_thread 74*10465441SEvalZero STR R0, [R2] 75*10465441SEvalZero_reswitch: 76*10465441SEvalZero LDR R2, =rt_interrupt_to_thread @; set rt_interrupt_to_thread 77*10465441SEvalZero STR R1, [R2] 78*10465441SEvalZero BX LR 79