forked from emutos/emutos
-
Notifications
You must be signed in to change notification settings - Fork 0
/
tosvars.ld
134 lines (125 loc) · 7.04 KB
/
tosvars.ld
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
* 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.
*/