中断调用INT21/AX=7305H 内容摘要
河石 /编 2006.11.10 黄河之滨 网站 ： http://hhstone.vip.sina.com ： http://www.hhstone.com
INTER60\INTERRUP.H 中关于中断调用 INT 21/AX=7305h 的内容摘要。 --------D-217305CXFFFF----------------------- INT 21 - Windows95 - FAT32 - EXTENDED ABSOLUTE DISK READ/WRITE AX = 7305h CX = FFFFh DL = drive number (01h=A:, etc.) SI = read/write mode flags (see #01791) DS:BX -> disk I/O packet (see #02548 at INT 25) Return: CF clear if successful CF set on error AX = error code Note: one can not specify the default drive (DL=00h) for this function. SeeAlso: AX=7302h,AX=7304h,INT 25,INT 26 Bitfields for Extended Absolute Disk Read/Write mode flags: Bit(s) Description (Table 01791) 0 direction (0=read, 1=write) 12-1 reserved (0) 14-13 write type (should be 00 on reads) 00 unknown data 01 FAT data 10 directory data 11 file data 15 reserved (0) ---------------------------------------------------- INTER60\INTERRUP.J 中关于中断调用 INT 25/CX=FFFFh 的内容摘要。 --------D-25----CXFFFF----------------------- INT 25 - DOS 3.31+ - ABSOLUTE DISK READ (32M-2047M hard-disk partition) CX = FFFFh AL = drive number (0=A, 1=B, etc) DS:BX -> disk read packet (see #02548) Return: CF clear if successful CF set on error AH = status (see #02547) AL = error code (same as passed to INT 24 in DI) AX = 0207h for FAT32 drive -- use INT 21/AX=7305h may destroy all other registers except segment registers; Win9X always sets SI to 0000h due to an apparent coding bug Notes: partition is potentially >32M (and requires this form of the call) if bit 1 of the device attribute word in the device driver is set original flags are left on stack, and must be removed by caller this call bypasses the DOS filesystem for FAT32 drives (which may be up to 2TB in size), use INT 21/AX=7305h SeeAlso: INT 13/AH=02h,INT 25,INT 26/CX=FFFFh,INT 21/AX=7305h Format of disk read packet: Offset Size Description (Table 02548) 00h DWORD sector number 04h WORD number of sectors to read 06h DWORD transfer address SeeAlso: #02552 --------k-25CDCD----------------------------- INT 25 - Stacker - GET DEVICE DRIVER ADDRESS AX = CDCDh DS:BX -> buffer for address (see #02549) CX = 0001h DX = 0000h Return: AX = CDCDh if Stacker installed DS:BX buffer filled Note: not supported by Stacker Anywhere; to obtain the Stacker device driver address and to detect drives controlled by all versions of Stacker, INT 21/AX=4404h"Stacker" or lookup via the CDS and DPB should be preferred (see INT 21/AH=52h) Stacker Anywhere does not link its built-in device driver into the standard device driver chain, but it can be found via CDS/DPB SeeAlso: INT 21/AX=4404h"Stacker" Format of Stacker v2+ driver address buffer: Offset Size Description (Table 02549) 00h WORD signature CDCDh 02h WORD ??? 0001h 04h DWORD pointer to Stacker signature at device driver offset 1Ah (see #02550) Format of Stacker v2+ device driver: Offset Size Description (Table 02550) 00h DWORD pointer to next driver, offset=FFFFh if last driver FFFFh:FFFFh for Stacker Anywhere 04h WORD device attributes (see #01647,#01648) 06h WORD device strategy entry point 08h WORD device interrupt entry point 0Ah BYTE number of subunits (drives) supported by driver 0 for Stacker Anywhere 0Bh 7 BYTEs signature "STAC-CD" for Stacker and Stacker Anywhere 12h 7 BYTEs ??? 19h BYTE always = 01h ?? (Stacker Anywhere points here) 1Ah WORD signature A55Ah (all other Stacker versions point here) 1Ch WORD Stacker version * 64h 0C8h = 200, 012Ch = 300, 0190h = 400 (also Stacker Anywhere) 1Eh WORD offset of volume-specific information offset table (list of WORDs, one per drive, containing offsets to various information) 20h 56 BYTEs n/a 58h BYTE volume number, set after INT 21/AX=4404h, INT 21/AX=4408h (use to index into volume-specific info offset table, should be set to FFh before and tested for change after) 59h 19 BYTEs n/a 6Ch 4 BYTEs ASCII string "SWAP" 70h 26 BYTEs drive mapping table (one byte for each drive A: through Z:) (only used for drives swapped by SSWAP.COM; other drives compressed by Stacker can be found with the standard device driver header signature (see INT 21/AH=52h) ---Stacker 4, Stacker Anywhere--- 8Ah 40 BYTEs ??? B2h 4 BYTEs ASCII string "SWP2" B6h 26 BYTEs drive table ??? D0h 150 BYTEs ??? 166h 60 BYTEs LZSINFO structure (see #02808 at INT 2F/AX=4A12h) SeeAlso: #02551,#01646 at INT 21/AH=52h Format of Stacker boot record: Offset Size Description (Table 02551) 1F0h 8 BYTEs Stacker signature (first byte is CDh) 1F8h DWORD pointer to start of Stacker device driver 1FCh WORD Stacker volume number 1FEh WORD ??? SeeAlso: #02550 --------c-25--FFSI4358----------------------- INT 25 - PC-CACHE.SYS - INSTALLATION CHECK AL = FFh SI = 4358h Return: SI = 6378h if installed CX = segment of device driver PC-CACHE.SYS DX = version (major in DH, minor in DL) Program: PC-CACHE.SYS is a small device driver used by PC-Cache v5.x to obtain access to certain disk drivers for devices such as Bernoulli drives SeeAlso: INT 13/AH=A0h --------!---Section-------------------------- 摘自《MASM汇编语言全集》1999 MSDN 有关内容
主题：中断调用INT 21/AX=7305h 的内容摘要