os_cpu_util_a.s

基于DISPIC33F UCOSII 的开发应用.编译为MPLAB IDE AND C30.

;
;********************************************************************************************************
;                                               uC/OS-II
;                                         The Real-Time Kernel
;
;                                (c) Copyright 2006, Micrium, Weston, FL
;                                          All Rights Reserved
;
;
;                                          dsPIC33 MPLab Port
;                                                 
;
; File         : os_cpu_util_a.s
; By           : Eric Shufro
; Port Version : V2.81 (and higher)
;********************************************************************************************************
;

;
;********************************************************************************************************
;                                            MACRO OS_REGS_SAVE
;
; Description : This macro saves the current state of the CPU onto the current tasks stack
;
; Notes       : W15 is the CPU stack pointer. It should never be pushed from the stack during
;               a context save.
;********************************************************************************************************
;

.macro OS_REGS_SAVE                                                     ; Start of Macro
    push.d   w0                                                         ; Push W0  and W1    onto the stack
    push.d   w2                                                         ; Push W2  and W3    onto the stack
    push.d   w4                                                         ; Push W4  and W5    onto the stack
    push.d   w6                                                         ; Push W6  and W7    onto the stack
    push.d   w8                                                         ; Push W8  and W9    onto the stack
    push.d   w10                                                        ; Push W10 and W11   onto the stack
    push.d   w12                                                        ; Push W12 and W13   onto the stack
    push     w14                                                        ; Push W14 **ONLY**  onto the stack

    push     ACCAL                                                      ; Push Accumulator A onto the stack
    push     ACCAH                                                      ; Push Accumulator A onto the stack
    push     ACCAU                                                      ; Push Accumulator A onto the stack
    push     ACCBL                                                      ; Push Accumulator B onto the stack
    push     ACCBH                                                      ; Push Accumulator B onto the stack
    push     ACCBU                                                      ; Push Accumulator B onto the stack
    push     TBLPAG                                                     ; Push the Table Page               Register onto the stack
    push     PSVPAG                                                     ; Push the Program Space Visibility Register onto the stack
    push     RCOUNT                                                     ; Push the Repeat Loop Counter      Register onto the stack 
    push     DCOUNT                                                     ; Push the Do Loop Counter          Register onto the stack      
    push     DOSTARTL                                                   ; Push the Do Loop Start Address    Register onto the stack 
    push     DOSTARTH                                                   ; Push the Do Loop Start Address    Register onto the stack
    push     DOENDL                                                     ; Push the Do Loop End   Address    Register onto the stack  
    push     DOENDH                                                     ; Push the Do Loop End   Address    Register onto the stack  
    
    push     SR                                                         ; Push the CPU Status               Register onto the stack
    push     CORCON                                                     ; Push the Core Control             Register onto the stack      
.endm                                                                   ; End of Macro

;
;********************************************************************************************************
;                                            MACRO OS_REGS_RESTORE
;
; Description : This macro restores the current state of the CPU from the current tasks stack
;
; Notes       : 1) W15 is the CPU stack pointer. It should never be popped from the stack during
;                  a context restore.
;               2) Registers are always popped in the reverse order from which they were pushed
;********************************************************************************************************
;

.macro OS_REGS_RESTORE                                                  ; Start of Macro
    pop      CORCON                                                     ; Pull the Core Control             Register from the stack      
    pop      SR                                                         ; Pull the CPU Status               Register from the stack
 
    pop      DOENDH                                                     ; Pull the Do Loop End   Address    Register from the stack
    pop      DOENDL                                                     ; Pull the Do Loop End   Address    Register from the stack  
    pop      DOSTARTH                                                   ; Pull the Do Loop Start Address    Register from the stack
    pop      DOSTARTL                                                   ; Pull the Do Loop Start Address    Register from the stack
    pop      DCOUNT                                                     ; Pull the Do Loop Counter          Register from the stack
    pop      RCOUNT                                                     ; Pull the Repeat Loop Counter      Register from the stack 
    pop      PSVPAG                                                     ; Pull the Program Space Visibility Register from the stack
    pop      TBLPAG                                                     ; Pull the Table Page               Register from the stack
    pop      ACCBU                                                      ; Pull Accumulator B from the stack
    pop      ACCBH                                                      ; Pull Accumulator B from the stack
    pop      ACCBL                                                      ; Pull Accumulator B from the stack
    pop      ACCAU                                                      ; Pull Accumulator A from the stack
    pop      ACCAH                                                      ; Pull Accumulator A from the stack
    pop      ACCAL                                                      ; Pull Accumulator A from the stack

    pop      w14                                                        ; Pull W14 **ONLY**  from the stack
    pop.d    w12                                                        ; Pull W12 and W13   from the stack
    pop.d    w10                                                        ; Pull W10 and W11   from the stack
    pop.d    w8                                                         ; Pull W8  and W9    from the stack
    pop.d    w6                                                         ; Pull W6  and W7    from the stack
    pop.d    w4                                                         ; Pull W4  and W5    from the stack
    pop.d    w2                                                         ; Pull W2  and W3    from the stack
    pop.d    w0                                                         ; Pull W0  and W1    from the stack
.endm                                                                   ; End of Macro