pnpAllocatePmmBlock PROC NEAR PUBLIC
push ax
invoke pmmServicesDispatcher, PMM_ALLOCATE_FUNCTION, eax, edx, cx 这句话什么意思呀？

shl edx, 16 ; Convert 32 bit DX:AX into 32 bit EDX
mov dx, ax ; Put AX to lower EDX

cmp edx, 0 ; Was the allocation successful?
jne allocGood ; DX:AX = 00000000 if failed

mov ax, TP_PMM_INIT ; Put PMM test point in AX
jmp postTerminalError ; Call terminal error handler

allocGood:
pop ax
ret
pnpAllocatePmmBlock ENDP