{"id":801,"date":"2020-12-06T18:10:35","date_gmt":"2020-12-06T18:10:35","guid":{"rendered":"https:\/\/www.ecsdump.net\/?page_id=801"},"modified":"2020-12-06T18:10:35","modified_gmt":"2020-12-06T18:10:35","slug":"os-2-ifs-inf","status":"publish","type":"page","link":"https:\/\/www.ecsdump.net\/?page_id=801","title":{"rendered":"OS\/2 IFS INF"},"content":{"rendered":"
\n

When initially transferring control to OS2LDR from a \u201cblack box\u201d, the following interface is defined:
\nDH
\nboot mode flags:
\nbit 0 (NOVOLIO) on indicates that the mini-FSD does not use MFSH_DOVOLIO.
\nbit 1 (RIPL) on indicates that boot volume is not local (RIPL boot)
\nbit 2 (MINIFSD) on indicates that a mini-FSD is present.
\nbit 3 (RESERVED)
\nbit 4 (MICROFSD) on indicates that a micro-FSD is present.
\nbits 5-7 are reserved and MUST be zero.
\nDL
\ndrive number for the boot disk. This parameter is ignored if either the NOVOLIO or MINIFSD bits are zero.
\nDS:SI
\nis a pointer to the BOOT Media\u2019s BPB<\/a>. This parameter is ignored if either the NOVOLIO or MINIFSD bits are zero.
\nES:DI
\nis a pointer to a filetable structure. The filetable structure has the following format:
\nstruct FileTable {
\nunsigned short ft_cfiles; \/* # of entries in this table\u00a0\/
\nunsigned short ft_ldrseg; \/<\/em>\u00a0paragraph # where OS2LDR is loaded\u00a0\/
\nunsigned long ft_ldrlen; \/<\/em>\u00a0length of OS2LDR in bytes\u00a0\/
\nunsigned short ft_museg; \/<\/em>\u00a0paragraph # where microFSD is loaded\u00a0\/
\nunsigned long ft_mulen; \/<\/em>\u00a0length of microFSD in bytes\u00a0\/
\nunsigned short ft_mfsseg; \/<\/em>\u00a0paragraph # where miniFSD is loaded\u00a0\/
\nunsigned long ft_mfslen; \/<\/em>\u00a0length of miniFSD in bytes\u00a0\/
\nunsigned short ft_ripseg; \/<\/em>\u00a0paragraph # where RIPL data is loaded\u00a0\/
\nunsigned long ft_riplen; \/<\/em>\u00a0length of RIPL data in bytes *\/
\n\/* The next four elements are 16:16 pointers to microFSD entry points *\/
\nunsigned short (far *ft_muOpen) (char far *pName, unsigned long far *pulFileSize);
\nunsigned long (far *ft_muRead) (long loffseek, char far *pBuf, unsigned long cbBuf);
\nunsigned long (far *ft_muClose)(void);
\nunsigned long (far *ft_muTerminate)(void);
\n}<\/p>\n

The microFSD entry points interface is defined as follows:
\nmu_Open \u2013 is passed a far pointer to name of file to be opened and a far pointer to a ULONG to return the file\u2019s size. The returned value (in AX) indicates success(0) or failure(non-0).
\nmu_Read \u2013 is passed a seek offset, a far pointer to a data buffer, and the size of the data buffer. The returned value(in DX:AX) indicates the number of bytes actually read.
\nmu_Close \u2013 has no parameters and expects no return value. It is a signal to the micro-FSD that the loader is done reading the current file.
\nmu_Terminate \u2013 has no parameters and expects no return value. It is a signal to the micro-FSD that the loader has finished reading the boot drive.
\nThe loader will call the micro-FSD in a Open-Read-Read-\u2026.-Read-Close sequence with each file read in from the boot drive.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

When initially transferring control to OS2LDR from a \u201cblack box\u201d, the following interface is defined: DH boot mode flags: bit 0 (NOVOLIO) on indicates that the mini-FSD does not use MFSH_DOVOLIO. bit 1 (RIPL) on indicates that boot volume is not local (RIPL boot) bit 2 (MINIFSD) on indicates that a mini-FSD is present. bit…<\/p>\n

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