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intsupc.c File Reference

#include "ki.h"

Go to the source code of this file.

Functions

VOID KiLowerIrqlSpecial (KIRQL)
VOID KiDispatchSoftwareInterrupt (KIRQL Irql)
VOID KiCheckForSoftwareInterrupt (KIRQL RequestIrql)
VOID KiRequestSoftwareInterrupt (KIRQL RequestIrql)

Function Documentation

VOID KiCheckForSoftwareInterrupt (  KIRQL  RequestIrql  ) 
 

Definition at line 98 of file intsupc.c.

References APC_LEVEL, DISPATCH_LEVEL, KiDisableInterrupts(), KiDispatchSoftwareInterrupt(), and KiRestoreInterrupts(). 

00104                    :
00105 
00106     Check for and dispatch pending software interrupts
00107 
00108 Arguments:
00109 
00110     Irql (a0) - New, lower IRQL
00111 
00112 Return Value:
00113 
00114     None.
00115 
00116 Notes:
00117 
00118     Caller must check IRQL has dropped below s/w IRQL level
00119     
00120 --*/
00121 
00122 {
00123     BOOLEAN InterruptState;
00124     
00125     InterruptState = KiDisableInterrupts();
00126     
00127     if (RequestIrql == APC_LEVEL) {
00128 
00129         //
00130         // Dispatch only DPC requests
00131         //
00132 
00133         while (PCR->DispatchInterrupt) {
00134             KiDispatchSoftwareInterrupt(DISPATCH_LEVEL);
00135         }
00136 
00137     } else {
00138 
00139         //
00140         // Dispatch either APC or DPC
00141         //
00142 
00143         while (PCR->SoftwareInterruptPending) {
00144             KIRQL Irql;
00145 
00146             if (PCR->DispatchInterrupt) {
00147                 Irql = DISPATCH_LEVEL;
00148             } else if (PCR->ApcInterrupt) {
00149                 Irql = APC_LEVEL;
00150             }
00151             KiDispatchSoftwareInterrupt(Irql);
00152         }
00153     }
00154 
00155     KiRestoreInterrupts(InterruptState);
00156 }

VOID KiDispatchSoftwareInterrupt (  KIRQL  Irql  ) 
 

Definition at line 32 of file intsupc.c.

References APC_LEVEL, KeGetCurrentPrcb, KernelMode, KiDeliverApc(), KiDispatchInterrupt(), KiLowerIrqlSpecial(), and NULL.

Referenced by KiCheckForSoftwareInterrupt(). 

00038                    :
00039 
00040     Dispatch pending software interrupt
00041 
00042 Arguments:
00043 
00044     Irql (a0) - Software interrupt to dispatch
00045 
00046 Return Value:
00047 
00048     None.
00049 
00050 Notes:
00051 
00052     Interrupts disabled on entry/return.
00053     The function is only called by KiCheckForSoftwareInterrupt that passes an
00054     Irql value of APC_LEVEL or DISPATCH_LEVEL.
00055 
00056     
00057 --*/
00058 
00059 {
00060     PKPRCB Prcb = KeGetCurrentPrcb();
00061 
00062     KiLowerIrqlSpecial(Irql); // set IRQL
00063 
00064     if (Irql == APC_LEVEL) {
00065 
00066         Prcb->ApcBypassCount += 1;
00067         PCR->ApcInterrupt = 0;
00068         
00069         _enable();
00070         
00071         //
00072         // Dispatch APC Interrupt via direct call to KiDeliverApc
00073         //
00074 
00075         KiDeliverApc(KernelMode,NULL,NULL);
00076     
00077         _disable();
00078 
00079     } else {
00080 
00081         Prcb->DpcBypassCount += 1;
00082         PCR->DispatchInterrupt = 0;
00083         
00084         _enable();
00085         
00086         //
00087         // Dispatch DPC Interrupt
00088         //
00089 
00090         KiDispatchInterrupt();
00091     
00092         _disable();
00093 
00094     }
00095 }

VOID KiLowerIrqlSpecial (  KIRQL   ) 
 

Referenced by KiDispatchSoftwareInterrupt().

VOID KiRequestSoftwareInterrupt (  KIRQL  RequestIrql  ) 
 

Definition at line 159 of file intsupc.c.

References APC_LEVEL, DISPATCH_LEVEL, and KeBugCheckEx().

Referenced by KeDetachProcess(), KeInsertQueueDpc(), KeReleaseMutant(), KeUnstackDetachProcess(), KeUpdateRunTime(), KiChkTimerExpireSysDpc(), and KiIpiProcessRequests(). 

00165                    :
00166 
00167    This function requests a software interrupt at the specified IRQL
00168    level.
00169 
00170 Arguments:
00171 
00172    RequestIrql (a0) - Supplies the request IRQL value.
00173 
00174 Return Value:
00175 
00176    None.
00177 
00178 --*/
00179 
00180 {
00181 #if DEBUG
00182     if ((RequestIrql < APC_LEVEL) || (RequestIrql > DISPATCH_LEVEL))
00183         KeBugCheckEx(INVALID_SOFTWARE_INTERRUPT, RequestIrql, 0, 0, 0);
00184 #endif
00185     ((PUCHAR)&PCR->SoftwareInterruptPending)[RequestIrql-APC_LEVEL] = 1;
00186 }
}

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