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tosvars.ld
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tosvars.ld
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/*
* tosvars.ld - TOS system variables
*
* Copyright (C) 2005-2022 The EmuTOS development team
*
* This file is distributed under the GPL, version 2 or at your
* option any later version. See doc/license.txt for details.
*/
/*
* The TOS system variables have been officially documented by Atari.
* They have fixed addresses in the 0x380-0x800 region, so they are only
* accessible in supervisor mode.
* Documentation: https://freemint.github.io/tos.hyp/en/bios_sysvars.html
*/
/*
* Note: this linker script fragment is included from emutos.ld.
* It is preprocessed, to allow #include, #define, #if, etc.
*/
/* ==== Start of Exception related variables ================================ */
_proc_lives = 0x380; /* validates system crash page, if 0x12345678 */
_proc_dregs = 0x384; /* saved registers d0-d7 */
_proc_aregs = 0x3a4; /* saved registers a0-a7 */
_proc_enum = 0x3c4; /* vector number of crash exception */
_proc_usp = 0x3c8; /* saved user stackpointer */
_proc_stk = 0x3cc; /* 16 words from exception stack */
/* ==== Start of System variables =========================================== */
sysvars_start = 0x400;
_etv_timer = 0x400; /* GEM event timer vector */
_etv_critic = 0x404; /* GEM critical error handler */
_etv_term = 0x408; /* GEM program termination vector */
_etv_xtra = 0x40c; /* GEM additional vectors (unused) */
_memvalid = 0x420; /* memory conf valid, if 0x752019f3 */
memvalid = _memvalid;
memctrl = 0x424; /* copy of contents of 0xffff8001 */
resvalid = 0x426; /* validates resvector, if 0x31415926 */
resvector = 0x42a; /* reset vector */
_phystop = 0x42e; /* physical top of RAM */
_membot = 0x432; /* start of TPA (user memory) */
_memtop = 0x436; /* end of TPA (user memory) */
_memval2 = 0x43a; /* validates memcntrl/memconf, if 0x237698aa */
memval2 = _memval2;
_flock = 0x43e; /* if != 0, VBL floppy routine is disabled */
_seekrate = 0x440; /* floppy seek rate */
_timer_ms = 0x442; /* time between timer calls in ms */
_fverify = 0x444; /* if != 0, verify floppy writes */
_bootdev = 0x446; /* default boot drive */
_palmode = 0x448; /* 0 = NTSC, else PAL */
_defshiftmod = 0x44a; /* default video resolution */
_sshiftmod = 0x44c; /* copy of contents of 0xffff8260 */
_v_bas_ad = 0x44e; /* screen base address */
_vblsem = 0x452; /* if > 0, the VBL routine is executed */
_nvbls = 0x454; /* number of VBL routines */
_vblqueue = 0x456; /* pointer to list of VBL routines */
_colorptr = 0x45a; /* pointer to color palette to be loaded */
_screenpt = 0x45e; /* pointer to video RAM for next VBL */
_vbclock = 0x462; /* number of VBL routines executed */
_frclock = 0x466; /* number of VBL routines processed */
_hdv_init = 0x46a; /* vector for hard disk initialization */
_swv_vec = 0x46e; /* vector for resolution change */
_hdv_bpb = 0x472; /* vector for getbpb for harddisk */
_hdv_rw = 0x476; /* vector for read/write for harddisk */
_hdv_boot = 0x47a; /* vector for hard disk boot */
_hdv_mediach = 0x47e; /* vector for hard disk media change */
_cmdload = 0x482; /* if not 0, load command.prg after boot */
_conterm = 0x484; /* attribute vector for console output */
trp14ret = 0x486; /* return address for trap #14 (unused) */
criticret = 0x48a; /* return address for critical error hndlr */
_themd = 0x48e; /* first memory descriptor block */
____md = 0x49e; /* space for additional memory descriptors */
_savptr = 0x4a2; /* pointer to BIOS save register block */
_nflops = 0x4a6; /* number of connected floppy drives */
_con_state = 0x4a8; /* vector for screen output */
_save_row = 0x4ac; /* temporary storage for cursor line pos. */
sav_context = 0x4ae; /* ptr to save area for exception processing */
_bufl = 0x4b2; /* pointers to buffer ctrl blocks for GEMDOS */
_hz_200 = 0x4ba; /* counter for 200 Hz system clock */
the_env = 0x4be; /* pointer to default environment string */
_drvbits = 0x4c2; /* bit allocation for physical drives */
_dskbufp = 0x4c6; /* pointer to disk buffer */
_autopath = 0x4ca; /* pointer to auto-execute path */
_vbl_list = 0x4ce; /* pointers to 8 VBL routines */
_dumpflg = 0x4ee; /* flag for screen dump */
_prtabt = 0x4f0; /* printer abort flag */
_sysbase = 0x4f2; /* pointer to start of OS */
_shell_p = 0x4f6; /* pointer to shell */
_end_os = 0x4fa; /* pointer to end of OS */
_exec_os = 0x4fe; /* pointer to entry point of OS */
_dump_vec = 0x502; /* pointer to screen dump routine */
_prt_stat = 0x506; /* pointer to prv_lsto */
_prt_vec = 0x50a; /* pointer to prv_lst */
_aux_stat = 0x50e; /* pointer to prv_auxo */
_aux_vec = 0x512; /* pointer to prv_aux */
_pun_ptr = 0x516; /* if AHDI, pointer to pun_info */
_memval3 = 0x51a; /* memory conf valid if = $5555aaaa */
memval3 = _memval3;
_bconstat_vec = 0x51e; /* 8 pointers to input-status routines */
_bconin_vec = 0x53e; /* 8 pointers to input routines */
_bcostat_vec = 0x55e; /* 8 pointers to output-status routines */
_bconout_vec = 0x57e; /* 8 pointers to output routines */
_longframe = 0x59e; /* if not 0, then not 68000 - use long stack frames */
_p_cookies = 0x5a0; /* pointer to cookie jar */
_ramtop = 0x5a4; /* top of TT-RAM, or NULL if no TT-RAM is present */
_ramvalid = 0x5a8; /* if equal to RAMVALID_MAGIC, then ramtop is valid */
_bell_hook = 0x5ac; /* pointer to routine for system bell */
_kcl_hook = 0x5b0; /* pointer to routine for system keyclick */
/*
* We can add any undocumented variables here, they will have fixed addresses
* and will be accessible in supervisor mode only.
*/
#if CONF_DETECT_FIRST_BOOT_WITHOUT_MEMCONF
/* any location not cleared on reset is ok */
_warm_magic = 0x6fc; /* set to WARM_MAGIC if next boot must not */
/* be considered as a first boot (reset) */
#endif
#if CONF_WITH_68030_PMMU
/*
* This is where the 68030 PMMU tree is built.
* Unless you really understand the implications, don't change this value!
*/
_pmmutree = 0x700; /* for pmmu tree on 68030 */
ASSERT((ABSOLUTE(_pmmutree) & 0xf) == 0, "error: bad _pmmutree alignment");
#endif
/*
* The sysvars region ends at 0x800.
*/