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Text File | 1993-07-29 | 28KB | 677 lines

******************************************************************************* * PowerDOS, an operating system by Chris Latham, Copyright (C) 1992 * This file is the PowerDOS System global definitions * * Begun on 01-10-92 * * Completed on 04-04-92 * * Revision history: * Date Comment **************************************************************************** opt C16- opt O+ opt OW- * The three OS vectors we are concerned with v_trap1 equ $84 BDOS vector v_trap13 equ $b4 BIOS vector v_trap14 equ $b8 XBIOS vector * ST global system variables etv_timer equ $400 AES timer (not used by PowerDOS) etv_critic equ $404 Critical error handler vector etv_term equ $408 AES terminate vector * equ $40c * equ $410 * equ $414 Expansion Vectors as defined by Atari * equ $418 * equ $41c * Globals used by PowerDOS (these must be located in an absolute location * for quick access without the need for a base register) Sys_vars equ $416 Points to global system variables S_int_flag equ $41a Interupt in progress flag S_startproc equ $41b Start next process flag S_ticks equ $41c #%0001000100010001 (tick rotate mask) dmasem equ $41e DMA semaphore memvalid equ $420 Contains $752019f3 for validation memctrl equ $424 Copy of mem controller config value _resvalid equ $426 Contains $31415926 if reset vector valid _resvector equ $42a If $426 valid, jump through this vector phystop equ $42e Physical top of memory _membot equ $432 Begin of TPA _memtop equ $436 End of TPA memval2 equ $43a Another magic number $237698aa flock equ $43e Disk access in progress seekrate equ $440 Floppy seek rate _timer_ms equ $442 Tick length in ms (20) _fverify equ $444 If not zero, verify floppy _bootdev equ $446 Device system was booted from palmode equ $448 If not zero, set to 50hz pal mode defshiftmod equ $44a 0=low, 1=medium (for color only) sshiftmod equ $44c $000,$100,$200 (low, med, high) _v_bas_ad equ $44e Logical screen base vblsem equ $452 If zero, no vblank routine nvbls equ $454 Number of vblank routines (8) _vbqueue equ $456 Points to vblank vectors colorptr equ $45a Points to new color palette or 0 screenpt equ $45e Points to new screen to set, or 0 _vbclock equ $462 Number of vbl interupts _frclock equ $466 Number of vbl routines executed hdv_init equ $46a Vector for hard drive initialization swv_vec equ $46e Vector for change in screen res hdv_bpb equ $472 Vector to fetch bpb for drives hdv_rw equ $476 Vector for drive read/write hdv_boot equ $47a Vector for drive reboot hdv_mediach equ $47e Vector to test for drive change _comload equ $482 If not 0, execute "COMMAND.PRG" conterm equ $484 Byte defining console attributes shiftstat equ $485 Byte containing shift/cntrl/alt status trp14ret equ $486 Trap #14 return address (unused) criticret equ $48a Return address for critical error themd equ $48e Initial Memory discriptor __md equ $49e (???) savptr equ $4a2 Points to reg save area for (x)bios calls _nflops equ $4a6 Number of connected floppies con_state equ $4a8 Vector for screen output save_row equ $4ac Temp storage for cursor sav_context equ $4ae Location of context after a crash _bufl equ $4b2 Points to head of BCB list cache_ptr equ $4b6 Points to first cashe header, or 0 _hz_200 equ $4ba Counter for 200 hz system clock the_env equ $4be Default environment string $00000000 _drvbits equ $4c2 Bit map of connected drives _dskbufp equ $4c6 Points to a 1024 byte disk buffer _autopath equ $4ca Points to autoexec path (0) _vbl_list equ $4ce 8 longs, vbl vectors _dumpflg equ $4ee Flag to start a screen dump _prtabt equ $4f0 Printer abort flag _sysbase equ $4f2 Start of the OS _shell_p equ $4f6 Global shell info (???) end_os equ $4fa End of OS (if ram based), start of TPA exec_os equ $4fe Exec address of AES * Next is used to determine if an extended exception stack frame is used. _longframe equ $59e 0 if 68000, else 020, 030, 040, etc. * System cookie jar _p_cookies equ $5a0 0 if no cookie jar, else ptr to jar * Value used to validate reset vector RESMAGIC equ $31415926 * The following are needed to determine the logical sector size if * cache sectors are to be installed. pun_ptr equ $516 Points to Physical Units info Defsize equ 512 Default sector size maxunits equ 16 Max units (at least for pun storeage) RSRESET puns rs.w 1 Total units in system pun rs.b maxunits Physical unit for each logical unit part_start rs.l maxunits Start of partition on the physical unit P_cookie rs.l 1 Cookie if AHDI 3.0 or later is installed P_cookptr rs.l 1 Points back to cookie to validate it P_version rs.w 1 Who knows? P_max_sec rs.w 1 Max sector size being handled * Macro to allow interupt routines to perform an s_send function without * causing unfreindly trap #1 grabbers to kill the system. What it does * is to save the current trap #1 vector on the stack, then replace it * with the known good vector of PowerDOS. After the call, the original vector * is restored. Note: uses a0, so it should not be one of the parameters * of the s_send call. int_s_send macro move.l (v_trap1).w,-(sp) Save original trap #1 vector move.l (Sys_vars).w,a0 Get pointer to system vars move.l G_trap1(a0),(v_trap1).w Put safe trap #1 s_send \1,\2 Perform s_send call move.l (sp)+,(v_trap1).w Restore original trap #1 vector endm * Error codes Edskchg equ -14 Disk in drive was changed Einvfn equ -32 Invalid function number Efilnf equ -33 File not found Epthnf equ -34 Pathname not found Enhndl equ -35 No file handles left Eaccdn equ -36 Access denied Eihndl equ -37 Invalid handle number Ensmem equ -39 Not enough memory left Eimba equ -40 Invalid memory block address Edrive equ -46 Invalid drive specification Enmfil equ -49 No more matching files Ebnam equ -52 Bad pathname element Efaterr equ -53 Error with FAT table Edskfull equ -54 Disk is full Elpcl equ -55 Clusters looped Erootful equ -56 Root directory is full Edirex equ -57 Directory already exists Elocked equ -58 Record is locked Enslock equ -59 Can't find requested lock to remove Eeof equ -60 End of file Etime equ -61 Device timed out Epermit equ -62 Permission violation Enovol equ -63 No volume name, can't change attributes Erange equ -64 Range error Eintrn equ -65 Internal error Eplfmt equ -66 Invalid program load format Egsbf equ -67 Setblock failure Eunknp equ -70 Unknown process Edeadpr equ -71 ID is for dead process Enochld equ -72 Process has no children Etabfull equ -73 IO device table is full Efmddne equ -74 File manager or device driver non-existant Eprocnf equ -75 Process with this name not found Eioqs equ -76 Process already part of this ioqueue chain Eqnf equ -77 Queue not found (by name) Eunknq equ -78 Unknown queue (by queue_id) Eqinuse equ -79 Queue in use; can't delete Eqempty equ -80 Queue has no message or count available Eqexist equ -81 Can't create; queue w/ same name exists Epipex equ -82 Can't create; pipe w/ same name exists Epipenf equ -83 Named pipe not found for open Epipewrt equ -84 Pipe write error: written data can't be read Enodev equ -85 No device for given device number Enomdev equ -86 No devices with given number or higher Eorphan equ -87 Process is an orphan; it has no parent Enosighand equ -88 Process has no signal handler installed * Base page offsets P_lowtpa equ 0 Base address of the TPA P_hitpa equ 4 End of TPA+1 P_tbase equ 8 Base address of text segment P_tlen equ $C Length of text segment P_dbase equ $10 Base address of data segment P_dlen equ $14 Length of data segment P_bbase equ $18 Base address of BSS P_blen equ $1C Length of BSS P_DTA equ $20 Points to programs DTA P_parent equ $24 Points to parents base page P_prgflags equ $28 Program flags from the file header P_env equ $2C Pointer to environment string P_fakeenv equ $68 If no env ptr, fake one is placed here P_prgname equ $6c Name of the program (ASCIIZ string) P_neofix equ $7c Pointer to caller's PC for p_exec #0 call P_cmdlin equ $80 Start of command line * File header format H_flag equ 0 Header type flag (601A) H_tlen equ 2 Length of text segment H_dlen equ 6 Length of data degment H_blen equ $A Length of BSS segment H_slen equ $E Length of symbol table H_rsv1 equ $12 Reserved 1 H_flags equ $16 Flags for altering loading conditions H_nreloc equ $1A Non zero if no relocation bytes H_btext equ $1C Beginning of text segment * Process descriptor definitions Num_files equ 32 Number of open files per process RSRESET PD_ID rs.w 1 Process ID PD_parent rs.w 1 Parent's ID PD_sibling rs.w 1 Sibling's ID PD_child rs.w 1 First child's ID PD_group rs.w 1 Group ID PD_user rs.w 1 User ID PD_priority rs.w 1 Process priority PD_age rs.w 1 Process age PD_status rs.b 1 Process execution status PD_queueID rs.b 1 Current queue (sleep, wait or active) PD_basepage rs.l 1 First memory block of process (basepage) PD_max_mem rs.l 1 Max mem size returned for Malloc #-1 PD_ucall rs.w 1 Last user state function call executed PD_scall rs.w 1 Last system state function call executed PD_uticks rs.l 1 Number of user state ticks elapsed PD_sticks rs.l 1 Number of system state ticks elapsed PD_sleep rs.l 1 Count of ticks to remain sleeping PD_datetime rs.l 1 Date and time process started PD_fcalls rs.l 1 Number of function calls executed PD_iocalls rs.l 1 Number of i/o calls executed PD_rbytes rs.l 1 Number of bytes read PD_wbytes rs.l 1 Number of bytes written PD_vector rs.l 1 User defined vector PD_dta rs.l 1 Disk transfer address PD_name rs.b 14 Name of process PD_devname rs.b 8 Process current device name (currently only A, B, C, etc.) PD_files rs.w Num_files Process local path handles PD_reentry rs.b 1 Count of number of levels of reenterancy PD_attrib rs.b 1 Various attributes PD_memblk rs.w 1 Index of head of procs mdb's PD_pqueue rs.l 1 Previous process queue pointer PD_nqueue rs.l 1 Next process queue pointer PD_pioq rs.w 1 ID of previous process in i/o queue PD_nioq rs.w 1 ID of next process in i/o queue PD_q_ptr rs.l 1 Pointer or flag for queue functions PD_intcpt rs.l 1 Address of signal intercept routine PD_intcptv rs.l 1 Address of vars needed for intercept PD_signal rs.l 1 Signal code that caused death PD_stack rs.l 1 Process stack pointer PD_reg_save rs.l 1 Pointer to current (X)BIOS register save PD_trap1 rs.l 1 Save area for "dirty" trap one vector PD_macpath rs.l 1 Pointer to a partial path to use * See the Macro Path definitions further on. Set to zero if a macro is * not being used, else is a pointer to the macro data structure. PD_defdirs rs.l 26 Default directory of up to 26 drives * Dir's first cluster number, 0 for root. Copied from parent when created * Most file managers that use this feature require only words; but a long * is allocated because of the future possibility of an HCFS file manager. PD_status2 rs.b 1 Place for new attributes to be stored PD_reserve1 rs.b 1 PD_reserve2 rs.w 18 Space for additions in the future... PD_stackbot rs.b 1000 Process supervisor stack space PD_sstack equ __RS Top of process supervisor stack rs.b 162 Allow for 3 levels of reentrancy to (X)BIOS PD_bios_sav equ __RS PD_size equ __RS Size of process descriptor * Process descriptor block allocation size. First long is pointer to next * block. Ten process descriptors per block allocated PD_alloc equ 4+PD_size*10 * Status flag bits (for PD_status) Sys_state equ 0 Executing in system state Wake_sig equ 1 Process has pending wakeup signal Time_out equ 2 Time slice has expired Subtask equ 3 Process is a subtask of parent Pexec4 equ 4 Assign base memory to parent on exit Condemn equ 5 Process is condemned Concurrent equ 6 Task is running concurrently with parent Deskthread equ 7 Set if process is Desktop process or decendent * Bit definitions for PD_attrib B_redirect equ 0 Have BIOS check for con redirection N_redirect equ 1 Make negative handles redirect proc_trace equ 3 If set, jump through trace vector on function call * Status flag bits for PD_status2 s2_preempt equ 0 Allow preemption when clear, even if process is in system state s2_suspend equ 1 Suspend process at next entry to user state * Defined signals S_kill equ 0 S_wake equ 1 S_abort equ 2 * Queue ID codes (for PD_queueID) Q_current equ 0 No queue, currently running Q_active equ 1 Active process queue Q_sleep equ 2 Sleeping process queue Q_wait equ 3 Waiting process queue Q_event equ 4 Waiting for an event Q_dead equ 5 No queue, dead process * The structure that is filled in when a p_procinf call is made RSRESET pi_pid rs.w 1 Process ID pi_ppid rs.w 1 Parent process ID pi_sibling rs.w 1 1st sibling's process ID pi_child rs.w 1 1st child's process ID pi_gu rs.l 1 Group.user ID pi_priority rs.w 1 Process priority pi_age rs.w 1 Process age pi_status rs.b 1 Process execution status pi_queueID rs.b 1 Current queue (sleep, wait or active) pi_basepage rs.l 1 First memory block of process (basepage) pi_max_mem rs.l 1 Max mem size returned for Malloc #-1 pi_ucall rs.w 1 Last user state function call executed pi_scall rs.w 1 Last system state function call executed pi_ucpu rs.l 1 Number of user state milliseconds used pi_scpu rs.l 1 Number of system state milliseconds used pi_sleep rs.l 1 Number of milliseconds left to sleep pi_datetime rs.l 1 Date and time process started pi_fcalls rs.l 1 Number of function calls executed pi_iocalls rs.l 1 Number of i/o calls executed pi_rbytes rs.l 1 Number of bytes read pi_wbytes rs.l 1 Number of bytes written pi_vector rs.l 1 User defined vector pi_dta rs.l 1 Disk transfer address pi_name rs.b 14 Name of process pi_devname rs.b 8 Process current device name pi_totmem rs.l 1 Total memory used by process pi_stack rs.l 1 Current process system stack pi_size equ __RS Total size of structure ************************************************************************ * I/O definitions * * Path descriptor definitions sz_pt_opt equ 40 Size of option vars (must be mul of 4) RSRESET PT_descrip rs.l 1 Points to device descriptor PT_params rs.l 1 Points to callers stacked parameters PT_owner rs.w 1 ID of current user (0 when done) PT_lastusr rs.w 1 Last user of path PT_count rs.b 1 # of local paths accessing this pd PT_mode rs.b 1 Mode of I/O (parameter from open call) PT_flags rs.b 1 Flags passed by OS (used by con routines) PT_forfm rs.b 1 Except bit 0, used by file manager PT_opt rs.b sz_pt_opt Optional file manager information PT_size equ __RS * bit definitions for PT_flags PTF_ne equ 1 If set, no echo PTF_necntr equ 2 If set, don't echo control codes PTF_rawcnt equ 4 If set, echo raw control codes PTF_ncsq equ 8 If set, ignor ^C, ^S or ^Q PTF_ncntrl equ 16 If set, ignor other control codes PTF_stripcr equ 32 If set, strip carriage rets & line feeds * bit definitions for PT_forfm d_io_bit equ 0 If this bit is set, path is dio path * Path block allocation size. First long is pointer to next block * Twenty paths per block allocated PT_alloc equ 4+PT_size*20 * File manager information for SCF path descriptor * These parameters may not be read or changed by the user RSSET PT_opt SC_link rs.l 1 Link to next path using same device SC_lastscan rs.w 1 Last scan code (if required) * These parameters may be read or set by the user *SC_attribs rs.b 1 Various attribute bits SC_echo rs.b 1 If set, echo input to output SC_scan rs.b 1 If set, return scan code SC_send_lf rs.b 1 If set, send lf after cr SC_des_back rs.b 1 If set, destructive backspace SC_pause rs.b 1 If set, pause at end of page SC_eor rs.b 1 Char recognized as end of record SC_aeor rs.b 1 Char recognized as alternate eor SC_eof rs.b 1 Char recognized as end of file SC_backspc rs.b 1 Char recognized as backspace SC_clrl rs.b 1 Char recognized as clear line SC_rpl rs.b 1 Char recognized as reprint line SC_newl rs.b 1 Char recognized as start new line SC_dupl rs.b 1 Char recognized as dup last line SC_bell rs.b 1 Char recognized as bell SC_tab rs.b 1 Char recognized as tab SC_abort rs.b 1 Char recognized as keyboard abort SC_xon rs.b 1 Char recognized as X-on SC_xoff rs.b 1 Char recognized as X-off SC_tab_wid rs.b 1 Width of tab field SC_plength rs.b 1 Lines per page SC_timeout rs.b 1 Number of seconds to wait for device * Attribute bits for SC_attribs *SC_echo equ 0 If set, echo input to output *SC_scan equ 1 If set, return scan code *SC_send_lf equ 2 If set, send lf after cr *SC_des_back equ 3 If set, destructive backspace *SC_pause equ 4 If set, pause at end of page * If SC_scan set, returns last scan code in SC_lastscan * If SC_tab_wid = 0, let tabs pass through (default) * SC_timeout is used on devices (like printers) that sould time out if * no response is given in a certain period of time. This is set to the * number of seconds (1 to 255) that the driver should wait for the * device to respond. 0 means an indefinite wait. ************************************************************************* * Following is information required by the system global variables section * * I/O device definition requirements * When an I/O device is installed, pointers are created to its * file manager and device driver jump tables and variables. When * a path is created, a pointer to the device descriptor information * is placed in the path descriptor. RSRESET DD_name rs.b 8 Name of the device DD_fm_globl rs.l 1 File manager var ptr (might not be used) DD_fm_jump rs.l 1 File manager jump table DD_dr_globl rs.l 1 Device driver var ptr (might not be used) DD_dr_jump rs.l 1 Device driver jump table DD_type rs.b 1 File manager type * 0 = RBF, 1 = PIPE, 2 = SCF, 3 = NET, 4 = NULL DD_share rs.b 1 If set, device not sharable DD_dev_vars rs.b 40 Device vars required by file manager DD_options rs.b sz_pt_opt Variables for path descriptor * The optional static vars are copied to the path descriptor when first * linked to the device descriptor. DD_size equ __RS iodevs equ 40 Max number of i/o devices in system * When installing a file manager, three pointers and a word are passed. * The first pointer is to the name of the file manager, the second to * its jump table, and the third is its global var ptr (if required). * The word is the file managers type. RSRESET Mfm_name rs.l 1 Points to name Mfm_entry rs.l 1 Points to jump table Mfm_vars rs.l 1 Points to any required ram storage Mfm_type rs.w 1 File manager type word Mfm_size equ __RS * When installing a device driver, three pointers are passed. The first * pointer is to the name of the device driver, the second to its jump * table, and the third is its global var ptr (if required). RSRESET Mdd_name rs.l 1 Points to name Mdd_entry rs.l 1 Points to jump table Mdd_vars rs.l 1 Points to any required ram storage Mdd_size equ __RS num_fms equ 10 Max number of file managers num_dds equ 30 Max number of device drivers * Offsets used to get pointers to name and jump table of fm or dd. RSRESET offs_name rs.w 1 Offset to name string offs_jump rs.w 1 Offset to jump table * Next is only necessary for file managers offs_fm rs.w 1 Offset to fm type byte * File manager routine offset definitions RSRESET FM_create rs.w 1 Create a file FM_open rs.w 1 Open an exisitng file FM_close rs.w 1 Close the file FM_read rs.w 1 Read from the file FM_write rs.w 1 Write to the file FM_readln rs.w 1 Read a line (generally CR terminated) FM_status rs.w 1 Get/set device/file status FM_makedir rs.w 1 Create a directory (RBFM) FM_deldir rs.w 1 Delete a directory (RBFM) FM_chngdir rs.w 1 Change current dir of drive (RBFM) FM_getdir rs.w 1 Get current dir of drive (RBFM) FM_chgatt rs.w 1 Change attributes of file (RBFM) FM_rename rs.w 1 Rename the file/folder (RBFM) FM_delete rs.w 1 Delete the file/folder (RBFM) FM_seek rs.w 1 Seek the file pointer (RBFM) FM_sfirst rs.w 1 Search for filespec (RBFM) FM_snext rs.w 1 Search for next filespec (RBFM) FM_gsdt rs.w 1 Get/set date/time of file (RBFM) FM_dskfree rs.w 1 Get free space on a disk (RBFM) * Opcodes used for status operations. These are all status operations that * may be performed on open files. Not all file managers support all of the * available operations. RSRESET st_input rs.b 1 Test for input data available st_output rs.b 1 Test for device output ready st_size rs.b 1 Get size of file st_pos rs.b 1 Get r/w pointer position st_eof rs.b 1 Test for end of file st_rlock rs.b 1 Change record lock attributes st_extfile rs.b 1 Extend the files length st_readopt rs.b 1 Read options section of path desc st_wrtopt rs.b 1 Write options section of path desc st_name rs.b 1 Copy name of open file to buffer st_type rs.b 1 Return the file manager type for the file * File manager types RSRESET fmtyp_rbf rs.b 1 Random block (disk) file manager fmtyp_pipe rs.b 1 Pipe (interprocess) fmtyp_scf rs.b 1 Sequencial character fmtyp_net rs.b 1 Network fmtyp_null rs.b 1 The 'do nothing' file manager * Queue directory structure. RSRESET qd_name rs.b 13 Name of the message queue (12 char + 0) qd_type rs.b 1 Type of queue * 0=message queue 1=event queue, 2=data queue qd_link rs.w 1 Number of users linked to queue (0 if free) qd_pid rs.w 1 PID of first waiting process qd_index rs.w 1 Index to buffer, count for event queue qd_size equ __RS qd_alloc equ 4+(qd_size*5) Size of allocation * Message queue buffer definitions RSRESET qb_next rs.w 1 Index of next; -1 if free, 0 if end qb_message rs.l 4 Four longs make up actual message * For data buffers, first long points to memory block, second long is * length of block qb_size equ __RS qb_alloc equ 4+(qb_size*10) Size of allocation * Memory Definition Block structure RSRESET mem_next rs.w 1 Index of next MDB (in ascending order) mem_prev rs.w 1 Index of previous MDB mem_start rs.l 1 Start of memory block mem_length rs.l 1 Length of memory block mem_owner rs.w 1 PID of owner, 0 for system, -1 for free or -2 if was tsr memory mem_link rs.w 1 Index of next MDB owned by process or system mem_size equ __RS mem_blksiz equ 4+(50*mem_size) Size of allocation block * Macro path structure definition. These are used to create pseudo drives * that represent other drives to the file system. For example, a macro, * called G:, could be created to represent C:\FOLDER1\FOLDER2 to the * file system. Then, when a path such as G:\FILENAME.EXT was used, the * file system would actually use C:\FOLDER1\FOLDER2\FILENAME.EXT. RSRESET mp_next rs.l 1 Next macro path in chain, or 0 for end mp_devname rs.b 1 Device name of macro (e.g. G, P, Z) mp_devnum rs.b 1 Device number of macro (0, 1, 2) mp_flag rs.b 1 Flag: set to zero when created or changed mp_reserved rs.b 1 mp_rootdir rs.l 1 Place for file manager to store root dir info mp_realname rs.b 8 Device name of real device mp_path rs.b 64 Path to use on real device mp_size equ __RS * * The following are the variables that are used by the kernal. These variables * are accessed off the A6 register, which is loaded with the start of the * table on entry. These are the global variables, but note that each * process has a table of variables associated with it. * RSRESET G_active rs.l 1 Head of active queue G_sleep rs.l 1 Head of sleeping queue G_wait rs.l 1 Head of waiting queue G_event rs.l 1 Head of event queue G_cur_pd rs.l 1 Process descriptor of current process G_totram rs.l 1 Total ram found in system (TPA size) G_bottpa rs.l 1 Bottom of TPA G_toptpa rs.l 1 Top of TPA G_maxtpa rs.l 1 Maximum tpa size given to process G_rsvmem rs.l 1 High water mark of m_(s)alloc(-1) calls G_rsvmaxbl rs.l 1 Max block size returned in G_rsvmem area G_mem_mdb rs.l 1 Points to 1st block of memory descriptor blocks G_hmem_st rs.w 1 Index of head of memory segment list (ST ram) G_tmem_st rs.w 1 Index of tail of memory segment list G_sys_mem rs.w 1 Index of linked system memory blocks G_memblks rs.w 1 Number of free memory block descriptors * Extra ram that may be added to the system is allways considered fastram. * When a block is added for the first time, the index to the head and tail * of the memory (the next two variables) are defined. If any more memory * is added after this, it will be added in to the same structure. (If it * is not contiguous with previous added ram, there will be a gap, but the * memory allocate and free routines deal with this situation properly.) G_hmem_alt rs.w 1 Head of alternate (TT) memory G_tmem_alt rs.w 1 Obviously the tail of said memory G_pd rs.l 1 Points to 1st process descriptor block G_pthd rs.l 1 Points to 1st path descriptor block G_queue_dir rs.l 1 Points to 1st queue directory block G_queue_buf rs.l 1 Points to 1st queue buffer block G_max_age rs.w 1 Max age to age a process G_min_pty rs.w 1 Min priority of ageable process G_timeslice rs.w 1 Number of milliseconds per tick (20) G_ticks rs.w 1 Number of ticks per second (50) G_timeout rs.l 1 Global timeout added to 200 hz clock G_idlecnt rs.l 1 Used to keep track of idle time in 5 ms periods G_idlecntdn rs.w 1 Count till next increment G_fastload rs.l 1 Number of k of heap to clear on prg load G_aes_stack rs.l 1 Current aes stack top G_term rs.l 1 Vector to jump through on proc term G_pexec rs.l 1 Vector to jump through on proc create G_trace rs.l 1 Vector to jump through to trace a process' function calls G_macropath rs.l 1 Pointer to any drive/path replacements G_pathcheck rs.l 1 Vector to jump through before path parsing * To allow PowerDOS to be expanded (or to emulate other OS's), a pointer * to another table of vectors is available (zero when not used). The first * long in this table is a pointer to another such table. The third word * is the lowest sevice number in the table, and the fourth word is the * highest service number. Following this is the long word pointers to * the service functions. If a vector in this tables is not used (an unused * function) it should be set to zero. G_extservic rs.l 1 Pointer to a table of extended services G_p_run rs.l 1 GemDOS p_run pointer; points to basepage G_version rs.w 1 Version number of GemDOS we are replacing G_sysver rs.w 1 Version of PowerDOS G_sysdate rs.l 1 Date of PowerDOS build (YYYYMMDD) G_flags rs.b 1 Various flags bits that may be needed * Definitions for the bits in G_flags. Gf_cookjar equ 0 Set if PowerDOS installed the cookie jar Gf_server equ 1 Set if system is being used as a network server G_reserve rs.b 1 * When we launch a concurrent task, we give it clean OS vectors so no tsr * programs will also be in the vectors. Such programs tend to fail when * used in a multitasking environment. The following are the original * vectors set when PowerDOS was installed. G_trap1 rs.l 1 Vector for BDOS G_trap13 rs.l 1 Vector for BIOS G_trap14 rs.l 1 Vector for XBIOS * The following is the special reserved block of memory used for video ram. Both * its start address and index are given. G_videomem rs.l 1 Start address of special videomem block G_videoidx rs.w 1 Index of MDB of video memory * The following are the non-public part of the system variables G_service rs.l $c0 Space for 192 BDOS service routines G_bservice rs.w 1 Number of BIOS routines rs.l 20 Space for 20 BIOS service routines G_xbservice rs.w 1 Number of XBIOS routines rs.l 140 Space for 140 XBIOS service routines rs.b 1000 Space for aes/accessory super stack G_stackaes equ __RS Top of aes stack space G_iodev rs.b DD_size*iodevs Space for IO devices G_fm rs.b Mfm_size*num_fms Space for file manager links G_drvr rs.b Mdd_size*num_dds Space for device driver links G_initmblk rs.b mem_blksiz*2 Initial memory definition blocks G_initpth rs.b PT_alloc Initial path block G_initproc rs.b PD_alloc Initial process descriptor block G_initqdir rs.b qd_alloc Initial queue directory block G_initqbuf rs.b qb_alloc Initial queue buffer block G_size equ __RS