353 lines
11 KiB
NASM
353 lines
11 KiB
NASM
TITLE "Interrupt Object Support Routines"
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;++
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;
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; Copyright (c) 2000 Microsoft Corporation
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;
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; Module Name:
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;
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; intsup.asm
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;
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; Abstract:
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;
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; This module implements the platform specific code to support interrupt
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; objects. It contains the interrupt dispatch code and the code template
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; that gets copied into an interrupt object.
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;
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; Author:
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;
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; David N. Cutler (davec) 19-Jun-2000
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;
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; Environment:
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;
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; Kernel mode only.
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;
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;--
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include ksamd64.inc
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extern KeBugCheck:proc
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extern KiInitiateUserApc:proc
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extern __imp_HalEndSystemInterrupt:qword
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subttl "Interrupt Exception Handler"
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;++
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;
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; EXCEPTION_DISPOSITION
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; KiInterruptHandler (
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; IN PEXCEPTION_RECORD ExceptionRecord,
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; IN PVOID EstablisherFrame,
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; IN OUT PCONTEXT ContextRecord,
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; IN OUT PDISPATCHER_CONTEXT DispatcherContext
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; )
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;
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; Routine Description:
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;
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; This routine is the exception handler for the interrupt dispatcher. The
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; dispatching or unwinding of an exception across an interrupt causes a
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; bug check.
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;
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; Arguments:
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;
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; ExceptionRecord (rcx) - Supplies a pointer to an exception record.
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;
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; EstablisherFrame (rdx) - Supplies the frame pointer of the establisher
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; of this exception handler.
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;
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; ContextRecord (r8) - Supplies a pointer to a context record.
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;
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; DispatcherContext (r9) - Supplies a pointer to the dispatcher context
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; record.
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;
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; Return Value:
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;
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; There is no return from this routine.
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;
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;--
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IhFrame struct
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P1Home dq ? ; parameter home address
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IhFrame ends
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NESTED_ENTRY KiInterruptHandler, _TEXT$00
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alloc_stack (sizeof IhFrame) ; allocate stack frame
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END_PROLOGUE
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mov ecx, INTERRUPT_UNWIND_ATTEMPTED ; set bug check code
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test dword ptr ErExceptionFlags[rcx], EXCEPTION_UNWIND ; test for unwind
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jnz short KiIH10 ; if nz, unwind in progress
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mov ecx, INTERRUPT_EXCEPTION_NOT_HANDLED ; set bug check code
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KiIH10: call KeBugCheck ; bug check - no return
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nop ; fill - do not remove
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NESTED_END KiInterruptHandler, _TEXT$00
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subttl "Chained Dispatch"
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;++
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;
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; VOID
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; KiChainedDispatch (
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; VOID
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; );
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;
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; Routine Description:
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;
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; This routine is entered as the result of an interrupt being generated
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; via a vector that is connected to more than one interrupt object.
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;
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; Arguments:
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;
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; rbp - Supplies a pointer to the interrupt object.
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;
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; Return Value:
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;
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; None.
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;
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;--
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NESTED_ENTRY KiChainedDispatch, _TEXT$00, KiInterruptHandler
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.pushframe code ; mark machine frame
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.pushreg rbp ; mark mark nonvolatile register push
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GENERATE_INTERRUPT_FRAME ; generate interrupt frame
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movzx ecx, byte ptr InIrql[rsi] ; set interrupt IRQL
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ENTER_INTERRUPT <NoEOI> ; raise IRQL and enable interrupts
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call KiScanInterruptObjectList ; scan interrupt object list
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EXIT_INTERRUPT ; do EOI, lower IRQL, and restore state
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NESTED_END KiChainedDispatch, _TEXT$00
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subttl "Scan Interrupt Object List"
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;++
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;
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; Routine Description:
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;
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; This routine scans the list of interrupt objects for chained interrupt
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; dispatch. If the mode of the interrupt is latched, then a complete scan
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; of the list must be performed. Otherwise, the scan can be cut short as
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; soon as an interrupt routine returns
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;
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; Arguments:
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;
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; rsi - Supplies a pointer to the interrupt object.
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;
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; Return Value:
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;
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; None.
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;
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;--
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SiFrame struct
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P1Home dq ? ; interrupt object parameter
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P2Home dq ? ; service context parameter
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Return db ? ; service routine return value
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Fill db 15 dup (?) ; fill
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SavedRbx dq ? ; saved register RBX
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SavedRdi dq ? ; saved register RDI
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SavedR12 dq ? ; saved register RSI
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SiFrame ends
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NESTED_ENTRY KiScanInterruptObjectList, _TEXT$00
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push_reg r12 ; save nonvolatile registers
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push_reg rdi ;
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push_reg rbx ;
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alloc_stack (sizeof SiFrame - (3 * 8)) ; allocate stack frame
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END_PROLOGUE
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lea rbx, InInterruptListEntry[rsi] ; get list head address
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mov r12, rbx ; set address of first list entry
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;
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; Scan the list of connected interrupt objects and call the service routine.
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;
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Si05: xor edi, edi ; clear interrupt handled flag
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Si10: sub r12, InInterruptListEntry ; compute interrupt object address
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movzx ecx, byte ptr InSynchronizeIrql[r12] ; get synchronization IRQL
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cmp cl, InIrql[rsi] ; check if equal interrupt IRQL
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je short Si20 ; if e, IRQL levels equal
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SetIrql ; set IRQL to synchronization level
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Si20: AcquireSpinLock InActualLock[r12] ; acquire interrupt spin lock
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mov rcx, r12 ; set interrupt object parameter
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mov rdx, InServiceContext[r12] ; set context parameter
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call qword ptr InServiceRoutine[r12] ; call interrupt service routine
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mov SiFrame.Return[rsp], al ; save return value
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ReleaseSpinLock InActualLock[r12] ; release interrupt spin lock
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movzx ecx, byte ptr InIrql[rsi] ; get interrupt IRQL
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cmp cl, InSynchronizeIrql[r12] ; check if equal synchronization IRQL
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je short Si30 ; if e, IRQL levels equal
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SetIrql ; set IRQL to interrupt level
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Si30: test byte ptr SiFrame.Return[rsp], 0ffh ; test if interrupt handled
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jz short Si40 ; if z, interrupt not handled
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cmp word ptr InMode[r12], InLatched ; check if latched interrupt
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jne short Si50 ; if ne, not latched interrupt
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inc edi ; indicate latched interrupt handled
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Si40: mov r12, InInterruptListEntry[r12] ; get next interrupt list entry
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cmp r12, rbx ; check if end of list
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jne Si10 ; if ne, not end of list
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;
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; The complete interrupt object list has been scanned. This can only happen
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; if the interrupt is a level sensitive interrupt and no interrupt was handled
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; or the interrupt is a latched interrupt. Therefore, if any interrupt was
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; handled it was a latched interrupt and the list needs to be scanned again
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; to ensure that no interrupts are lost.
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;
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test edi, edi ; test if any interrupts handled
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jnz Si05 ; if nz, latched interrupt handled
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Si50: add rsp, sizeof SiFrame - (3 * 8) ; deallocate stack frame
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pop rbx ; restore nonvolatile register
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pop rdi ;
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pop r12 ;
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ret ;
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NESTED_END KiscanInterruptObjectList, _TEXT$00
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subttl "Interrupt Dispatch"
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;++
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;
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; Routine Description:
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;
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; This routine is entered as the result of an interrupt being generated
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; via a vector that is connected to an interrupt object. Its function is
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; to directly call the specified interrupt service routine.
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;
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; N.B. On entry rbp and rsi have been saved on the stack.
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;
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; Arguments:
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;
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; rbp - Supplies a pointer to the interrupt object.
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;
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; Return Value:
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;
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; None.
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;
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;--
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NESTED_ENTRY KiInterruptDispatch, _TEXT$00, KiInterruptHandler
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.pushframe code ; mark machine frame
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.pushreg rbp ; mark mark nonvolatile register push
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GENERATE_INTERRUPT_FRAME ; generate interrupt frame
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;
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; N.B. It is possible for a interrupt to occur at an IRQL that is lower
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; than the current IRQL. This happens when the IRQL raised and at
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; the same time an interrupt request is granted.
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;
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movzx ecx, byte ptr InIrql[rsi] ; set interrupt IRQL
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ENTER_INTERRUPT <NoEOI> ; raise IRQL and enable interrupts
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lea rax, (-128)[rbp] ; set trap frame address
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mov InTrapFrame[rsi], rax ;
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AcquireSpinLock InActualLock[rsi] ; acquire interrupt spin lock
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mov rcx, rsi ; set address of interrupt object
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mov rdx, InServiceContext[rsi] ; set service context
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call qword ptr InServiceRoutine[rsi] ; call interrupt service routine
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ReleaseSpinLock InActualLock[rsi] ; release interrupt spin lock
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EXIT_INTERRUPT ; do EOI, lower IRQL, and restore state
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NESTED_END KiInterruptDispatch, _TEXT$00
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subttl "Disable Processor Interrupts"
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;++
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;
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; BOOLEAN
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; KeDisableInterrupts(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function saves the state of the interrupt enable flag, clear the
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; state of the interrupt flag (disables interrupts), and return the old
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; inerrrupt enable flag state.
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;
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; Arguments:
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;
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; None.
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;
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; Return Value:
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;
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; If interrupts were previously enabled, then 1 is returned as the function
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; value. Otherwise, 0 is returned.
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;
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;--
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DiFrame struct
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Flags dd ? ; processor flags
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Fill dd ? ; fill
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DiFrame ends
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NESTED_ENTRY KeDisableInterrupts, _TEXT$00
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push_eflags ; push processor flags
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END_PROLOGUE
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mov eax, DiFrame.Flags[rsp] ; isolate interrupt enable bit
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shr eax, EFLAGS_IF_SHIFT ;
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and al, 1 ;
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cli ; disable interrupts
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add rsp, sizeof DiFrame ; deallocate stack frame
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ret ; return
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NESTED_END KeDisableInterrupts, _TEXT$00
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subttl "Interrupt Template"
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;++
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;
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; Routine Description:
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;
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; This routine is a template that is copied into each interrupt object.
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; Its function is to save volatile machine state, compute the interrupt
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; object address, and transfer control to the appropriate interrupt
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; dispatcher.
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;
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; N.B. Interrupts are disabled on entry to this routine.
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;
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; Arguments:
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;
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; None.
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;
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; Return Value:
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;
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; N.B. Control does not return to this routine. The respective interrupt
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; dispatcher dismisses the interrupt directly.
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;
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;--
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LEAF_ENTRY KiInterruptTemplate, _TEXT$00
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push rax ; push dummy vector number
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push rbp ; save nonvolatile register
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lea rbp, KiInterruptTemplate - InDispatchCode ; get interrupt object address
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jmp qword ptr InDispatchAddress[rbp] ; finish in common code
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LEAF_END KiInterruptTemplate, _TEXT$00
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end
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