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中国DOS联盟论坛 The time now is 2026-10-26 15:15 |
47,815 topics / 349,928 posts / today 0 new / 48,288 members |
| DOS启动盘 & LOGO技术 （启动盘室） » Assembly Question |
| Printable Version 676 / 0 |
| Floor1 low_lever | Posted 2003-09-27 00:00 |
| 初级用户 Posts 9 Credits 136 | |
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pnpAllocatePmmBlock PROC NEAR PUBLIC
push ax invoke pmmServicesDispatcher, PMM_ALLOCATE_FUNCTION, eax, edx, cx What does this line mean? 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 |
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