2020-11-30 13:13:08 +08:00
|
|
|
/*
|
2022-01-18 13:35:13 +08:00
|
|
|
* Copyright (c) 2006-2022, RT-Thread Development Team
|
2020-11-30 13:13:08 +08:00
|
|
|
*
|
|
|
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
|
|
|
*
|
|
|
|
|
* Change Logs:
|
|
|
|
|
* Date Author Notes
|
2022-01-18 13:35:13 +08:00
|
|
|
* 2020-03-19 WangHuachen first version
|
2020-11-30 13:13:08 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
.section .text, "ax"
|
|
|
|
|
/*
|
|
|
|
|
* rt_base_t rt_hw_interrupt_disable();
|
|
|
|
|
*/
|
|
|
|
|
.globl rt_hw_interrupt_disable
|
|
|
|
|
rt_hw_interrupt_disable:
|
|
|
|
|
mrs r0, cpsr
|
|
|
|
|
cpsid if
|
|
|
|
|
bx lr
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* void rt_hw_interrupt_enable(rt_base_t level);
|
|
|
|
|
*/
|
|
|
|
|
.globl rt_hw_interrupt_enable
|
|
|
|
|
rt_hw_interrupt_enable:
|
|
|
|
|
msr cpsr, r0
|
|
|
|
|
bx lr
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* void rt_hw_context_switch_to(rt_uint32 to);
|
|
|
|
|
* r0 --> to
|
|
|
|
|
*/
|
|
|
|
|
.globl rt_hw_context_switch_to
|
|
|
|
|
rt_hw_context_switch_to:
|
|
|
|
|
ldr sp, [r0] @ get new task stack pointer
|
|
|
|
|
|
|
|
|
|
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
|
2022-01-18 13:35:13 +08:00
|
|
|
ldmfd sp!, {r1} /* Restore floating point registers */
|
2020-11-30 13:13:08 +08:00
|
|
|
vmsr FPEXC, r1
|
|
|
|
|
ldmfd sp!, {r1}
|
|
|
|
|
vmsr FPSCR, r1
|
|
|
|
|
vldmia sp!, {d0-d15}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
ldmfd sp!, {r4} @ pop new task spsr
|
|
|
|
|
msr spsr_cxsf, r4
|
|
|
|
|
|
|
|
|
|
ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
.section .text.isr, "ax"
|
|
|
|
|
/*
|
|
|
|
|
* void rt_hw_context_switch(rt_uint32 from, rt_uint32 to);
|
|
|
|
|
* r0 --> from
|
|
|
|
|
* r1 --> to
|
|
|
|
|
*/
|
|
|
|
|
.globl rt_hw_context_switch
|
|
|
|
|
rt_hw_context_switch:
|
|
|
|
|
stmfd sp!, {lr} @ push pc (lr should be pushed in place of PC)
|
|
|
|
|
stmfd sp!, {r0-r12, lr} @ push lr & register file
|
|
|
|
|
|
|
|
|
|
mrs r4, cpsr
|
|
|
|
|
tst lr, #0x01
|
|
|
|
|
beq _ARM_MODE
|
|
|
|
|
orr r4, r4, #0x20 @ it's thumb code
|
|
|
|
|
|
|
|
|
|
_ARM_MODE:
|
|
|
|
|
stmfd sp!, {r4} @ push cpsr
|
|
|
|
|
|
|
|
|
|
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
|
|
|
|
|
vstmdb sp!, {d0-d15} /* Store floating point registers */
|
|
|
|
|
vmrs r4, FPSCR
|
|
|
|
|
stmfd sp!,{r4}
|
|
|
|
|
vmrs r4, FPEXC
|
|
|
|
|
stmfd sp!,{r4}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
str sp, [r0] @ store sp in preempted tasks TCB
|
|
|
|
|
ldr sp, [r1] @ get new task stack pointer
|
|
|
|
|
|
|
|
|
|
#if defined (__VFP_FP__) && !defined(__SOFTFP__)
|
2022-01-18 13:35:13 +08:00
|
|
|
ldmfd sp!, {r1} /* Restore floating point registers */
|
2020-11-30 13:13:08 +08:00
|
|
|
vmsr FPEXC, r1
|
|
|
|
|
ldmfd sp!, {r1}
|
|
|
|
|
vmsr FPSCR, r1
|
|
|
|
|
vldmia sp!, {d0-d15}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
ldmfd sp!, {r4} @ pop new task cpsr to spsr
|
|
|
|
|
msr spsr_cxsf, r4
|
|
|
|
|
|
|
|
|
|
ldmfd sp!, {r0-r12, lr, pc}^ @ pop new task r0-r12, lr & pc, copy spsr to cpsr
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* void rt_hw_context_switch_interrupt(rt_uint32 from, rt_uint32 to);
|
|
|
|
|
*/
|
|
|
|
|
.globl rt_thread_switch_interrupt_flag
|
|
|
|
|
.globl rt_interrupt_from_thread
|
|
|
|
|
.globl rt_interrupt_to_thread
|
|
|
|
|
.globl rt_hw_context_switch_interrupt
|
|
|
|
|
rt_hw_context_switch_interrupt:
|
|
|
|
|
ldr r2, =rt_thread_switch_interrupt_flag
|
|
|
|
|
ldr r3, [r2]
|
|
|
|
|
cmp r3, #1
|
|
|
|
|
beq _reswitch
|
|
|
|
|
mov r3, #1 @ set rt_thread_switch_interrupt_flag to 1
|
|
|
|
|
str r3, [r2]
|
|
|
|
|
ldr r2, =rt_interrupt_from_thread @ set rt_interrupt_from_thread
|
|
|
|
|
str r0, [r2]
|
|
|
|
|
_reswitch:
|
|
|
|
|
ldr r2, =rt_interrupt_to_thread @ set rt_interrupt_to_thread
|
|
|
|
|
str r1, [r2]
|
|
|
|
|
bx lr
|
