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; * 2009-01-20 Bernard first version 9; * 2011-07-22 Bernard added thumb mode porting 10; */ 11 12NOINT EQU 0xc0 ; disable interrupt in psr 13 14 AREA |.text|, CODE, READONLY, ALIGN=2 15 ARM 16 REQUIRE8 17 PRESERVE8 18 19;/* 20; * rt_base_t rt_hw_interrupt_disable(); 21; */ 22rt_hw_interrupt_disable PROC 23 EXPORT rt_hw_interrupt_disable 24 MRS r0, cpsr 25 ORR r1, r0, #NOINT 26 MSR cpsr_c, r1 27 BX lr 28 ENDP 29 30;/* 31; * void rt_hw_interrupt_enable(rt_base_t level); 32; */ 33rt_hw_interrupt_enable PROC 34 EXPORT rt_hw_interrupt_enable 35 MSR cpsr_c, r0 36 BX lr 37 ENDP 38 39;/* 40; * void rt_hw_context_switch(rt_uint32 from, rt_uint32 to); 41; * r0 --> from 42; * r1 --> to 43; */ 44rt_hw_context_switch PROC 45 EXPORT rt_hw_context_switch 46 STMFD sp!, {lr} ; push pc (lr should be pushed in place of PC) 47 STMFD sp!, {r0-r12, lr} ; push lr & register file 48 49 MRS r4, cpsr 50 TST lr, #0x01 51 BEQ _ARM_MODE 52 ORR r4, r4, #0x20 ; it's thumb code 53 54_ARM_MODE 55 STMFD sp!, {r4} ; push cpsr 56 57 STR sp, [r0] ; store sp in preempted tasks TCB 58 LDR sp, [r1] ; get new task stack pointer 59 60 LDMFD sp!, {r4} ; pop new task cpsr to spsr 61 MSR spsr_cxsf, r4 62 BIC r4, r4, #0x20 ; must be ARM mode 63 MSR cpsr_cxsf, r4 64 65 LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr 66 ENDP 67 68;/* 69; * void rt_hw_context_switch_to(rt_uint32 to); 70; * r0 --> to 71; */ 72rt_hw_context_switch_to PROC 73 EXPORT rt_hw_context_switch_to 74 LDR sp, [r0] ; get new task stack pointer 75 76 LDMFD sp!, {r4} ; pop new task cpsr to spsr 77 MSR spsr_cxsf, r4 78 BIC r4, r4, #0x20 ; must be ARM mode 79 MSR cpsr_cxsf, r4 80 81 LDMFD sp!, {r0-r12, lr, pc}^ ; pop new task r0-r12, lr & pc, copy spsr to cpsr 82 ENDP 83 84;/* 85; * void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to); 86; */ 87 IMPORT rt_thread_switch_interrupt_flag 88 IMPORT rt_interrupt_from_thread 89 IMPORT rt_interrupt_to_thread 90 91rt_hw_context_switch_interrupt PROC 92 EXPORT rt_hw_context_switch_interrupt 93 LDR r2, =rt_thread_switch_interrupt_flag 94 LDR r3, [r2] 95 CMP r3, #1 96 BEQ _reswitch 97 MOV r3, #1 ; set rt_thread_switch_interrupt_flag to 1 98 STR r3, [r2] 99 LDR r2, =rt_interrupt_from_thread ; set rt_interrupt_from_thread 100 STR r0, [r2] 101_reswitch 102 LDR r2, =rt_interrupt_to_thread ; set rt_interrupt_to_thread 103 STR r1, [r2] 104 BX lr 105 ENDP 106 107 END