?? os_cpu_a.s
字號:
;********************************************************************************************************
; uC/OS-II
; The Real-Time Kernel
;
; ATmega128 Specific code
;
;
; File : OS_CPU_A.S
; By : Ole Saether
; Jean J. Labrosse
;********************************************************************************************************
; I/O PORT ADDRESSES
;********************************************************************************************************
BIT00 = 0x01
BIT01 = 0x02
BIT02 = 0x04
BIT03 = 0x08
BIT04 = 0x10
BIT05 = 0x20
BIT06 = 0x40
BIT07 = 0x80
SREG = 0x3F
SPH = 0x3E
SPL = 0x3D
RAMPZ = 0x3B
;********************************************************************************************************
; MACROS
;********************************************************************************************************
.macro PUSH_ALL ; Save all registers
ST -Y,R0
ST -Y,R1
ST -Y,R2
ST -Y,R3
ST -Y,R4
ST -Y,R5
ST -Y,R6
ST -Y,R7
ST -Y,R8
ST -Y,R9
ST -Y,R10
ST -Y,R11
ST -Y,R12
ST -Y,R13
ST -Y,R14
ST -Y,R15
ST -Y,R16
ST -Y,R17
ST -Y,R18
ST -Y,R19
ST -Y,R20
ST -Y,R21
ST -Y,R22
ST -Y,R23
ST -Y,R24
ST -Y,R25
ST -Y,R26
ST -Y,R27
ST -Y,R30
ST -Y,R31
IN R16,RAMPZ
ST -Y,R16
.endmacro
.macro POP_ALL ; Restore all registers
LD R16,Y+
OUT RAMPZ,R16
LD R31,Y+
LD R30,Y+
LD R27,Y+
LD R26,Y+
LD R25,Y+
LD R24,Y+
LD R23,Y+
LD R22,Y+
LD R21,Y+
LD R20,Y+
LD R19,Y+
LD R18,Y+
LD R17,Y+
LD R16,Y+
LD R15,Y+
LD R14,Y+
LD R13,Y+
LD R12,Y+
LD R11,Y+
LD R10,Y+
LD R9,Y+
LD R8,Y+
LD R7,Y+
LD R6,Y+
LD R5,Y+
LD R4,Y+
LD R3,Y+
LD R2,Y+
LD R1,Y+
LD R0,Y+
.endmacro
.macro PUSH_SP ; Save stack pointer
IN R16,SPH
ST -Y,R16
IN R16,SPL
ST -Y,R16
.endmacro
.macro POP_SP ; Restore stack pointer
LD R16,Y+
OUT SPL,R16
LD R16,Y+
OUT SPH,R16
.endmacro
.macro PUSH_SREG ; Save status register
IN R16,SREG
ST -Y,R16
.endmacro
.macro POP_SREG ; Restore status registers
LD R16,Y+
OUT SREG,R16
.endmacro
.area text(rel)
;/*$PAGE*/.
;********************************************************************************************************
; DISABLE/ENABLE INTERRUPTS USING OS_CRITICAL_METHOD #3
;
; Description : These functions are used to disable and enable interrupts using OS_CRITICAL_METHOD #3.
;
; OS_CPU_SR OSCPUSaveSR (void)
; Get current value of SREG
; Disable interrupts
; Return original value of SREG
;
; void OSCPURestoreSR (OS_CPU_SR cpu_sr)
; Set SREG to cpu_sr
; Return
;********************************************************************************************************
_OS_CPU_SR_Save::
IN R16,SREG ; Get current state of interrupts disable flag
CLI ; Disable interrupts
RET ; Return original SREG value in R16
_OS_CPU_SR_Restore::
OUT SREG,R16 ; Restore SREG
RET ; Return
;/*$PAGE*/.
;********************************************************************************************************
; START HIGHEST PRIORITY TASK READY-TO-RUN
;
; Description : This function is called by OSStart() to start the highest priority task that was created
; by your application before calling OSStart().
;
; Note(s) : 1) The (data)stack frame is assumed to look as follows:
;
; OSTCBHighRdy->OSTCBStkPtr --> SPL of (return) stack pointer (Low memory)
; SPH of (return) stack pointer
; Flags to load in status register
; R31
; R30
; R27
; .
; .
; R0
; PCH
; PCL (High memory)
;
; where the stack pointer points to the task start address.
;
;
; 2) OSStartHighRdy() MUST:
; a) Call OSTaskSwHook() then,
; b) Set OSRunning to TRUE,
; c) Switch to the highest priority task.
;********************************************************************************************************
_OSStartHighRdy::
CALL _OSTaskSwHook ; Invoke user defined context switch hook
LDS R16,_OSRunning ; Indicate that we are multitasking
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