..//ntos/ke/i386/trap.asm:1127:_KiFastCallEntry proc
..//ntos/ke/i386/trap.asm:1180:_KiFastCallEntry endp
_KiFastCallEntry函数的作用是运行_KiSystemServiceRepeat函数
返回系统输入后的指令
; 位于共享用户中已知位置的指令
; 数据结构（这样我们就可以动态地放置正确的
; 系统初始化时处理器的代码）
PUBLIC _KiFastCallEntry
_KiFastCallEntry proc
;
; Return to the instruction immediately following the sysenter
; instruction which is at a known location in the shared user
; data structure (this is so we can dynamically place the right
; code for the processor at system init).
;
ifndef NT_UP
mov ecx, KGDT_R0_PCR
mov fs, ecx
endif ;; NT_UP
mov ecx, PCR[PcPrcbData+PbCurrentThread] ; get current thread address
;
; Calculate initial stack pointer from thread initial stack.
; If this isn't the same as esp0 then we are a VX86 thread and we are rejected
;
mov ecx, [ecx].ThInitialStack
lea esp, [ecx-(NPX_FRAME_LENGTH + (TsV86Gs - TsHardwareSegSS))]
mov ecx, PCR[PcTss]
cmp esp, [ecx].TssEsp0
jne Kfsc90
;
; Set ecx to return address in user mode
;
mov ecx, MM_SHARED_USER_DATA_VA+UsSystemCall+fscrOffset
Kfsc10:
push KGDT_R3_DATA OR RPL_MASK ; Push user SS
push edx ; Push ESP
pushfd
push 2 ; Sanitize eflags
popfd ;
add edx, 8 ; (edx) -> arguments
or dword ptr [esp], EFLAGS_INTERRUPT_MASK ; Enable interrupts
push KGDT_R3_CODE OR RPL_MASK ; Push user CS
push ecx ; push return address
ifndef NT_UP
; For the MP case, FS is already loaded above
ENTER_SYSCALL kfce_a, kfce_t, NoFSLoad
jmp _KiSystemServiceRepeat
endif ;; NT_UP
_KiFastCallEntry endp
