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From: | blk5743 AT yahoo DOT com DOT tw |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: code from BC31(16bits) to DJGPP(32 bits) |
Date: | 30 Nov 2005 17:34:54 -0800 |
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XMS should be above 1MB, right. but DX:BX max is FFFF:FFFF can not over 1MB therefore, the max allocated XMS buffer's start address = 1M+64K if i allocate 2 region of 1MB block, how can i get the 2 region's start address. another question is about physical address of buf i declar ************************************************************************************** -----r_buffer?------- physical __djgpp_conventional_base+&r_buffer, no RM address, PM address &r_buffer | | | | | | --------EXE-------- physical __djgpp_conventional_base, no RM address, PM *************************************************************************************** i have a test code as below BYTE r_buffer[100],buf[20]; ==>r_buffer's physical address ==> DWORD Addr = (DWORD)__djgpp_conventional_base+(DWORD)r_buffer where )__djgpp_conventional_base = 0xEF810000, r_buffer = 0x126E8 dosmemget(Addr,10,buf);==> it will fail(seem Addr is too large, the max i tried is 0x105FF7) program exit code:255(0x00FF) how can i make sure that physical address is correct. i need to check the physical address is correct like this ==>PRD_DDS.Offset =(ULONG)PRD_Table+__djgpp_conventional_base; thanks
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