If a subtype id is less than 4 characters long, it should be padded with zeros.

bits	meaning
----	-------
0-7	some printable character
	to characterize the current version,
	e.g.
	0x61 (`a') if alpha release,
	0x62 (`b') if beta release.
	For official releases you will
	always find a value of 0 here.
8-15	patchlevel (0x55 for pl 88)
16-23	minor version number (0x0e for x.14)
24-31	major version number ($01 for 1.xx)

bits	meaning
----	-------
0-15	binary year ($07dd for 1998)
16-23	binary month ($0c for the December)
24-31	binary day of the month 

bits	meaning
----	-------
0-7	binary seconds
8-15	binary minutes
16-23	binary hours
24-31	day of week

The call should never return a zero in these bits, but if it does, it should be interpreted as Sunday.

bits	meaning
----	-------
0-7	binary minor CPU ID
8-15	binary major CPU ID
16-31	reserved for future definition.

The minor CPU ID interpretation depends on the major ID. For 68k series, values are as follows:

$00	68000
$0a	68010
$14	68020
$1e	68030
$28	68040
$3c	68060

bits	meaning
----	-------
0	memory protection (1 = turned on)
1	virtual memory (1 = turned on)
2-31	reserved for future usage 

1. If arg1 is a value bigger than 65535 (0xffff), it is interpreted as a tag id. The Cookie Jar is searched for such a tag, then if the tag is found, the corresponding slot value is returned or -1 otherwise.
2. If arg1 is a value between 1 and 65535, it is interpreted as a slot number, not a tag id.Then the corresponding tag id is fetched and returned or a value of -1 if the specified slot is free or does not exist at all (a slot number past the end of the Cookie Jar was specified). The first slot in the Cookie Jar is considered number 1.
3. If arg1 is equal to a zero, then the Cookie Jar is searched for the NULL cookie, then the corresponding slot value is returned.

This behaviour (where arg2 != NULL) is not implemented in MiNT versions below 1.14.8.

S_SETCOOKIE requires root euid, EACCDN is returned otherwise and no action is performed.

The call refuses to place a cookie (a value of -1 is returned) whose tag id contains a zero-byte.

If the desired address is long word aligned, longwords can be also retrieved from the supervisor area using Setexc().

0: none of hardware specific system calls are restricted. This is a 'MultiTOS compatibility' mode.

1: BIOS and XBIOS calls require root privileges; any call except Supexec() and Super() returns EACCDN if called by an unprivileged process.

2: as above, with except that Supexec() executing the user procedure doesn't enter supervisor mode, and the Super(), if called without root privileges, generates SIGSYS in order to kill the calling process.

On values bigger than a 2, the EACCDN is returned. If arg1 is equal to a -1, the current security level value is returned.

The call totally needs root privileges - user processes cannot even inquire the current security level value.

No current version of MiNT understands the concept of run levels, neither characteristics of run levels are defined. Thus the S_RUNLEVEL mode should be considered reserved for future definition.

Setting the timeslice requires root privileges.

On Ssystem(S_FORCEFASTLOAD, 0L, 0L); the program header bit will be used as before, this is actually equal to FASTLOAD=NO in MINT.CNF.

On Ssystem(S_FORCEFASTLOAD, 1L, 0L); , the program header bit will be ignored and fastload will be forced for all programs.

arg1 = -1 allows to interrogate the current state of this variable.

You need root privileges to toggle the FASTLOAD mode.

If arg1 is a positive value, it is interpreted as a new sync time value.

If arg1 is equal to -1, the current sync time value will be returned.

To be able to change the filesystem sync time you need root privileges desperately.

Any other positive value of the arg1 sets the current clock mode. On a 0 it is reset to UTC, or to local time otherwise.

Although this call will never really change the setting of the hardware clock, due to the changed interpretation the clock seems to warp; don't play around too much with it.

move.l  arg2,-(sp)
move.l  arg1,-(sp)
move.w	opcode,-(sp)
move.w  #$0154,-(sp)
trap    #1
lea     $0c(sp),sp

The S_OSHEADER opcode should be only used for fetching the TOS version number when running MiNT versions below 1.15.0 release.

You should never use Ssystem(S_TIOCMGET, ...); in own programs.

The Ssystem() behaviour does not depend on the S_SECLEVEL settings.

Any values returned by the kernel on reserved fields should be considered undocumented and no software should rely on them.

Prior to any further Ssystem() usage, your application should first check if the kernel supports this call. If it does, the Ssystem(-1, 0L, 0L); should return a zero.

Ssystem() is used and supported by the MiNT Library as of patchlevel 48.