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/*
* File : context.asm
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2009, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-04-09 fify the first version
*
* For : Renesas M16C
* Toolchain : IAR's EW for M16C v3.401
*/
;********************************************************************************************************
; PUBLIC FUNCTIONS
;********************************************************************************************************
RSEG CSTACK
RSEG ISTACK
RSEG CODE(1)
EXTERN rt_thread_switch_interrput_flag
EXTERN rt_interrupt_from_thread
EXTERN rt_interrupt_to_thread
EXTERN rt_interrupt_enter
EXTERN rt_tick_increase
EXTERN rt_interrupt_leave
EXTERN u0rec_handler
PUBLIC rt_hw_interrupt_disable
PUBLIC rt_hw_interrupt_enable
PUBLIC rt_hw_context_switch_to
PUBLIC rt_hw_context_switch
PUBLIC rt_hw_context_switch_interrupt
PUBLIC rt_hw_timer_handler
PUBLIC rt_hw_uart0_receive_handler
rt_hw_interrupt_disable
FCLR I
RTS
rt_hw_interrupt_enable
FSET I
RTS
;/*
; * void rt_hw_context_switch_to(rt_uint32 to);
; * r0 --> to
; * this fucntion is used to perform the first thread switch
; */
rt_hw_context_switch_to
MOV.W R0, A0
LDC [A0], ISP
POPM R0,R1,R2,R3,A0,A1,SB,FB
REIT
rt_hw_context_switch
PUSHM R0,R1,R2,R3,A0,A1,SB,FB
MOV.W R0, A0
STC ISP, [A0]
MOV.W R1, A0
LDC [A0], ISP
POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore all processor registers from the new task's stack
REIT
rt_hw_context_switch_interrupt
CMP.W #1,rt_thread_switch_interrput_flag
JEQ jump
MOV.W #1,rt_thread_switch_interrput_flag
MOV.W R0, rt_interrupt_from_thread
jump
MOV.W R1, rt_interrupt_to_thread
RTS
rt_hw_context_switch_interrupt_do
MOV.W #0, rt_thread_switch_interrput_flag
MOV.W rt_interrupt_from_thread, A0
STC ISP, [A0]
MOV.W rt_interrupt_to_thread, A0
LDC [A0], ISP
POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore all processor registers from the new task's stack
RTS ; Normal return
.EVEN
rt_hw_timer_handler:
PUSHM R0,R1,R2,R3,A0,A1,SB,FB ; Save current task's registers
JSR rt_interrupt_enter
JSR rt_tick_increase
JSR rt_interrupt_leave
CMP.W #1,rt_thread_switch_interrput_flag
JEQ rt_hw_context_switch_interrupt_do
POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore registers from the new task's stack
REIT ; Return from interrup
.EVEN
rt_hw_uart0_receive_handler:
PUSHM R0,R1,R2,R3,A0,A1,SB,FB ; Save current task's registers
JSR rt_interrupt_enter
JSR u0rec_handler
JSR rt_interrupt_leave
CMP.W #1, rt_thread_switch_interrput_flag
JEQ rt_hw_context_switch_interrupt_do
POPM R0,R1,R2,R3,A0,A1,SB,FB ; Restore registers from the new task's stack
REIT ; Return from interrup
END
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