os_cpu_a.asm

arm_bootloader _flash writter &USB

    AREA os_cpu_a, CODE, READONLY
    CODE32
    PRESERVE8   ; http://www.keil.com/support/docs/3268.htm


;********************************************************************************************************
;                                           PUBLIC FUNCTIONS
;********************************************************************************************************
                                                                ; External references.
    IMPORT  OSPrioCur
    IMPORT  OSPrioHighRdy
    IMPORT  OSTCBCur
    IMPORT  OSTCBHighRdy
    IMPORT  OSRunning
    IMPORT  OSIntEnter
    IMPORT  OSIntExit
    IMPORT  IRQ_Entry
                                                                ; Functions declared in this file.
    EXPORT  OS_CPU_SR_Save
    EXPORT  OS_CPU_SR_Restore
    EXPORT  OSIntCtxSw
    EXPORT  OSCtxSw
    EXPORT  OSStartHighRdy
    EXPORT  OS_CPU_IRQ_ISR    

;********************************************************************************************************
;                                                EQUATES
;********************************************************************************************************

OS_CPU_ARM_CONTROL_INT_DIS        EQU  0xC0                     ; Disable both FIQ and IRQ.
OS_CPU_ARM_CONTROL_FIQ_DIS        EQU  0x40                     ; Disable FIQ.
OS_CPU_ARM_CONTROL_IRQ_DIS        EQU  0x80                     ; Disable IRQ.


;********************************************************************************************************
;                                  CRITICAL SECTION METHOD 3 FUNCTIONS
;
; Description: Disable/Enable interrupts by preserving the state of interrupts.  Generally speaking you
;              would store the state of the interrupt disable flag in the local variable 'cpu_sr' and then
;              disable interrupts.  'cpu_sr' is allocated in all of uC/OS-II's functions that need to
;              disable interrupts.  You would restore the interrupt disable state by copying back 'cpu_sr'
;              into the CPU's status register.
;
; Prototypes : OS_CPU_SR  OS_CPU_SR_Save    (void);
;              void       OS_CPU_SR_Restore (OS_CPU_SR  os_cpu_sr);
;
;
; Note(s)    : (1) These functions are used in general like this:
;
;                 void Task (void  *p_arg)
;                 {
;                                                               /* Allocate storage for CPU status register.            */
;                 #if (OS_CRITICAL_METHOD == 3)
;                      OS_CPU_SR  os_cpu_sr;
;                 #endif
;
;                          :
;                          :
;                      OS_ENTER_CRITICAL();                     /* os_cpu_sr = OS_CPU_SR_Save();                        */
;                          :
;                          :
;                      OS_EXIT_CRITICAL();                      /* OS_CPU_SR_Restore(cpu_sr);                           */
;                          :
;                          :
;                 }
;********************************************************************************************************

; 硂妓糶穦Τ