/* * Copyright (c) 2006-2018, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2013-07-05 Bernard the first version */ #include <rtconfig.h> .section .text, "ax" /* * rt_base_t rt_hw_interrupt_disable(); */ .globl rt_hw_interrupt_disable rt_hw_interrupt_disable: mrs r0, cpsr cpsid i 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 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 .bss.share.isr _guest_switch_lvl: .word 0 .globl vmm_virq_update .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 orrne r4, r4, #0x20 @ it's thumb code stmfd sp!, {r4} @ push cpsr str sp, [r0] @ store sp in preempted tasks TCB ldr sp, [r1] @ get new task stack pointer 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 ldr ip, =rt_interrupt_from_thread @ set rt_interrupt_from_thread mov r3, #1 @ set rt_thread_switch_interrupt_flag to 1 str r0, [ip] str r3, [r2] _reswitch: ldr r2, =rt_interrupt_to_thread @ set rt_interrupt_to_thread str r1, [r2] bx lr