📄 kernel.asm
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global _firstbuf_firstbuf dd 0 ; 0047 disk buffer chain dw 0 ; 004B Number of dirty buffers dd 0 ; 004D pre-read buffer dw 0 ; 0051 number of look-ahead buffers global _bufloc_bufloc db 0 ; 0053 00=conv 01=HMA global _deblock_buf_deblock_buf dd 0 ; 0054 deblock buffer times 3 db 0 ; 0058 unknown dw 0 ; 005B unknown db 0, 0FFh, 0 ; 005D unknown global _VgaSet_VgaSet db 0 ; 0060 unknown dw 0 ; 0061 unknown global _uppermem_link_uppermem_link db 0 ; 0063 upper memory link flag_min_pars dw 0 ; 0064 minimum paragraphs of memory ; required by program being EXECed global _uppermem_root_uppermem_root dw 0ffffh ; 0066 dmd_upper_root (usually 9fff)_last_para dw 0 ; 0068 para of last mem searchSysVarEnd:;; FreeDOS specific entries global _os_setver_minor_os_setver_minor db 0 global _os_setver_major_os_setver_major db 5 global _os_minor_os_minor db 0 global _os_major _os_major db 5 global _rev_number_rev_number db 0 global _version_flags _version_flags db 0 global _f_nodes_f_nodes dd 0 global _f_nodes_cnt_f_nodes_cnt dw 0 global os_release extern _os_releaseos_release dw _os_release;; The first 5 sft entries appear to have to be at DS:00cc times (0cch - ($ - DATASTART)) db 0 global _firstsftt_firstsftt: dd -1 ; link to next dw 5 ; count ; Some references seem to indicate that this data should start at 01fbh in; order to maintain 100% MS-DOS compatibility. times (01fbh - ($ - DATASTART)) db 0 global MARK01FBHMARK01FBH equ $ global _local_buffer ; local_buffer is 256 bytes long ; so it overflows into kb_buf!! ; only when kb_buf is used, local_buffer is limited to 128 bytes._local_buffer: times 128 db 0 global _kb_buf_kb_buf db 128,0 ; initialise buffer to empty times 128+1 db 0 ; room for 128 byte readline + LF;; Variables that follow are documented as part of the DOS 4.0-6.X swappable; data area in Ralf Browns Interrupt List #56;; this byte is used for ^P support global _PrinterEcho_PrinterEcho db 0 ;-34 - 0 = no printer echo, ~0 echo global _verify_ena_verify_ena db 0 ; ~0, write with verify; this byte is used for TAB's global _scr_pos_scr_pos db 0 ; Current Cursor Column global _switchar_switchar db '/' ;-31 - switch char global _mem_access_mode_mem_access_mode db 0 ;-30 - memory allocation strategy global sharing_flagsharing_flag db 0 ; 00 = sharing module not loaded ; 01 = sharing module loaded, but ; open/close for block devices ; disabled ; FF = sharing module loaded, ; open/close for block devices ; enabled (not implemented) global _net_set_count_net_set_count db 1 ;-28 - count the name below was set global _net_name_net_name db ' ' ;-27 - 15 Character Network Name db 00 ; Terminating 0 byte;; Variables contained the the "STATE_DATA" segment contain; information about the STATE of the current DOS Process. These; variables must be preserved regardless of the state of the INDOS; flag.;; All variables that appear in "STATE_DATA" **MUST** be declared; in this file as the offsets from the INTERNAL_DATA variable are; critical to the DOS applications that modify this data area.;; global _ErrorMode, _InDOS global _CritErrLocus, _CritErrCode global _CritErrAction, _CritErrClass global _CritErrDev, _CritErrDrive global _dta global _cu_psp, _default_drive global _break_ena global _return_code global _internal_data global _CritPatch_CritPatch dw 0d0ch ;-11 zero list of patched critical dw 0d0ch ; section variables dw 0d0ch dw 0d0ch dw 0d0ch db 0 ;-01 - unknown_internal_data: ; <-- Address returned by INT21/5D06_ErrorMode db 0 ; 00 - Critical Error Flag_InDOS db 0 ; 01 - Indos Flag_CritErrDrive db 0 ; 02 - Drive on write protect error_CritErrLocus db 0 ; 03 - Error Locus_CritErrCode dw 0 ; 04 - DOS format error Code_CritErrAction db 0 ; 06 - Error Action Code_CritErrClass db 0 ; 07 - Error Class_CritErrDev dd 0 ; 08 - Failing Device Address_dta dd 0 ; 0C - current DTA_cu_psp dw 0 ; 10 - Current PSPbreak_sp dw 0 ; 12 - used in int 23_return_code dw 0 ; 14 - return code from process_default_drive db 0 ; 16 - Current Drive_break_ena db 1 ; 17 - Break Flag (default TRUE) db 0 ; 18 - flag, code page switching db 0 ; 19 - flag, copy of 18 on int 24h abort global _swap_always, _swap_indos_swap_always: global _Int21AX_Int21AX dw 0 ; 1A - AX from last Int 21 global owning_psp, _MachineIdowning_psp dw 0 ; 1C - owning psp_MachineId dw 0 ; 1E - remote machine ID dw 0 ; 20 - First usable mcb dw 0 ; 22 - Best usable mcb dw 0 ; 24 - Last usable mcb dw 0 ; 26 - memory size in paragraphs dw 0 ; 28 - unknown db 0 ; 2A - unknown db 0 ; 2B - unknown db 0 ; 2C - unknown global _break_flg_break_flg db 0 ; 2D - Program aborted by ^C db 0 ; 2E - unknown db 0 ; 2F - not referenced global _DayOfMonth_DayOfMonth db 1 ; 30 - day of month global _Month_Month db 1 ; 31 - month global _YearsSince1980_YearsSince1980 dw 0 ; 32 - year since 1980daysSince1980 dw 0FFFFh ; 34 - number of days since epoch ; force rebuild on first clock read global _DayOfWeek_DayOfWeek db 2 ; 36 - day of week_console_swap db 0 ; 37 console swapped during read from dev global _dosidle_flag _dosidle_flag db 1 ; 38 - safe to call int28 if nonzero_abort_progress db 0 ; 39 - abort in progress global _CharReqHdr_CharReqHdr: global _ClkReqHdr_ClkReqHdr times 30 db 0 ; 3A - Device driver request header dd 0 ; 58 - pointer to driver entry global _MediaReqHdr_MediaReqHdr times 22 db 0 ; 5C - Device driver request header global _IoReqHdr_IoReqHdr times 30 db 0 ; 72 - Device driver request header times 6 db 0 ; 90 - unknown global _ClkRecord_ClkRecord times 6 db 0 ; 96 - CLOCK$ transfer record dw 0 ; 9C - unknown global __PriPathBuffer__PriPathBuffer times 80h db 0 ; 9E - buffer for file name global __SecPathBuffer__SecPathBuffer times 80h db 0 ;11E - buffer for file name global _sda_tmp_dm_sda_tmp_dm times 21 db 0 ;19E - 21 byte srch state global _SearchDir_SearchDir times 32 db 0 ;1B3 - 32 byte dir entry global _TempCDS_TempCDS times 88 db 0 ;1D3 - TemporaryCDS buffer global _DirEntBuffer_DirEntBuffer times 32 db 0 ;22B - space enough for 1 dir entry global _wAttr_wAttr dw 0 ;24B - extended FCB file attribute global _SAttr_SAttr db 0 ;24D - Attribute Mask for Dir Search global _OpenMode_OpenMode db 0 ;24E - File Open Attribute times 3 db 0 global _Server_Call_Server_Call db 0 ;252 - Server call Func 5D sub 0 db 0 ; Pad to 05CCh times (25ch - ($ - _internal_data)) db 0 global _tsr ; used by break and critical error_tsr db 0 ;25C - handlers during termination db 0 ;25D - padding global term_pspterm_psp dw 0 ;25E - 0?? global int24_esbpint24_esbp times 2 dw 0 ;260 - pointer to criticalerr DPB global _user_r, int21regs_off, int21regs_seg_user_r:int21regs_off dw 0 ;264 - pointer to int21h stack frameint21regs_seg dw 0 global critical_spcritical_sp dw 0 ;268 - critical error internal stack global current_ddsccurrent_ddsc times 2 dw 0 ; Pad to 059ah times (27ah - ($ - _internal_data)) db 0 global current_devicecurrent_device times 2 dw 0 ;27A - 0?? global _lpCurSft_lpCurSft times 2 dw 0 ;27e - Current SFT global _current_ldt_current_ldt times 2 dw 0 ;282 - Current CDS global _sda_lpFcb_sda_lpFcb times 2 dw 0 ;286 - pointer to callers FCB global _current_sft_idx_current_sft_idx dw 0 ;28A - SFT index for next open ; used by MS NET ; Pad to 05b2h times (292h - ($ - _internal_data)) db 0 dw __PriPathBuffer ; 292 - "sda_WFP_START" offset in DOS DS of first filename argument dw __SecPathBuffer ; 294 - "sda_REN_WFP" offset in DOS DS of second filename argument ; Pad to 05ceh times (2aeh - ($ - _internal_data)) db 0 global _current_filepos_current_filepos times 2 dw 0 ;2AE - current offset in file ; Pad to 05f0h times (2d0h - ($ - _internal_data)) db 0 global _prev_user_r global prev_int21regs_off global prev_int21regs_seg_prev_user_r:prev_int21regs_off dw 0 ;2D0 - pointer to prev int 21 frameprev_int21regs_seg dw 0 ; Pad to 05fdh times (2ddh - ($ - _internal_data)) db 0 global _ext_open_action global _ext_open_attrib global _ext_open_mode_ext_open_action dw 0 ;2DD - extended open action_ext_open_attrib dw 0 ;2DF - extended open attrib_ext_open_mode dw 0 ;2E1 - extended open mode ; Pad to 0620h times (300h - ($ - _internal_data)) db 0 global _szNames_szNames: ;; times 11 db 0 global _FcbSearchBuffer ; during FCB search 1st/next use bottom_FcbSearchBuffer: ; of error stack as scratch buffer; times 43 db 0 ; - only used during int 21 call ; stacks are made to initialize to no-ops so that high-water ; testing can be performed global apistk_bottomapistk_bottom: times STACK_SIZE dw 0x9090 ;300 - Error Processing Stack global _error_tos_error_tos: times STACK_SIZE dw 0x9090 ;480 - Disk Function Stack global _disk_api_tos_disk_api_tos: times STACK_SIZE dw 0x9090 ;600 - Char Function Stack global _char_api_tos_char_api_tos:apistk_top: db 0 ; 780 ???_VolChange db 0 ;781 - volume change_VirtOpen db 0 ;782 - virtual open flag ; controlled variables end at offset 78Ch so pad to end times (78ch - ($ - _internal_data)) db 0;; end of controlled variables;segment _BSS;!! global _NumFloppies;!!_NumFloppies resw 1;!!intr_dos_stk resw 1;!!intr_dos_seg resw 1; mark front and end of bss area to clearsegment IB_B global __ib_start__ib_start:segment IB_E global __ib_end__ib_end: ;; do not clear the other init BSS variables + STACK: too late.⌨️ 快捷键说明
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