reactos操作系统实现(98)

通过上面的分析，发现设置一个中断处理是非常复杂的，下面就来通过图来分析一个中断发生时，中断处理的过程如下图：

其实所有上面代码，就是设置这些流程里工作的函数关键代码，以便整个中断连接起来。其中一些函数是在汇编代码里面，这些都需要仔细分析才能理解。

主要调用下面这两个汇编代码，如下：

#001 .func KiInterruptTemplate

#002 _KiInterruptTemplate:

#003

#004 /* Enter interrupt trap */

#005 INT_PROLOG kit_a,kit_t,DoPushFakeErrorCode

#006

#007 _KiInterruptTemplate2ndDispatch:

#008 /* Dummy code,will be replaced by the address of the KINTERRUPT */

#009 mov edi,0

#010

#011 _KiInterruptTemplateObject:

#012 /* Dummy jump,will be replaced by the actual jump */

#013 jmp _KeSynchronizeExecution@12

#014

#015 _KiInterruptTemplateDispatch:

#016 /* Marks the end of the template so that the jump above can be edited */

#017

#018 TRAP_FIXUPS kit_a,DoFixupV86,DoFixupAbios

#019 .endfunc

和

#001 .func KiInterruptDispatch@0

#002 _KiInterruptDispatch@0:

#003

#004 /* Increase interrupt count */

#005 inc dword ptr PCR[KPCR_PRCB_INTERRUPT_COUNT]

#006

#007 /* Save trap frame */

#008 mov ebp,esp

#009

#010 /* Save vector and IRQL */

#011 mov eax,[edi+KINTERRUPT_VECTOR]

#012 mov ecx,[edi+KINTERRUPT_SYNCHRONIZE_IRQL]

#013

#014 /* Save old irql */

#015 push eax

#016 sub esp,4

#017

#018 /* Begin interrupt */

#019 push esp

#020 push eax

#021 push ecx

#022 call _HalBeginSystemInterrupt@12

#023

#024 /* Check if it was handled */

#025 or al,al

#026 jz SpuriousInt

#027

#028 /* Acquire the lock */

#029 GetIntLock:

#030 mov esi,[edi+KINTERRUPT_ACTUAL_LOCK]

#031 ACQUIRE_SPINLOCK(esi,IntSpin)

#032

#033 /* Make sure that this interrupt isn't storming */

#034 VERIFY_INT kid

#035

#036 /* Save the tick count */

#037 mov ebx,_KeTickCount

#038

#039 /* Call the ISR */

#040 mov eax,[edi+KINTERRUPT_SERVICE_CONTEXT]

#041 push eax

#042 push edi

#043 call [edi+KINTERRUPT_SERVICE_ROUTINE]

#044

#045 /* Check if the ISR timed out */

#046 add ebx,_KiISRTimeout

#047 cmp _KeTickCount,ebx

#048 jnc IsrTimeout

#049

#050 ReleaseLock:

#051 /* Release the lock */

#052 RELEASE_SPINLOCK(esi)

#053

#054 /* Exit the interrupt */

#055 INT_EPILOG 0

#056

#057 SpuriousInt:

#058 /* Exit the interrupt */

#059 add esp,8

#060 INT_EPILOG 1

#061

#062 #ifdef CONFIG_SMP

#063 IntSpin:

#064 SPIN_ON_LOCK(esi,GetIntLock)

#065 #endif

#066

#067 IsrTimeout:

#068 /* Print warning message */

#069 push [edi+KINTERRUPT_SERVICE_ROUTINE]

#070 push offset _IsrTimeoutMsg

#071 call _DbgPrint

#072 add esp,8

#073

#074 /* Break into debugger,then continue */

#075 int 3

#076 jmp ReleaseLock

#077

#078 /* Cleanup verification */

#079 VERIFY_INT_END kid,0

#080.endfunc

（编辑：李大同）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!