%	this is a generic MMIX BIOS
                   %	it is considert to be in ROM mapped
                   %	at physical address 0000 0000 0000 0000
                   %	used with 
                   %	virtual address 8000 0000 0000 0000
                   
                   %	Definition of Constants
                   
                   %	Physical Addresses and Interrupt Numbers of Devices
                   		PREFIX	:RAM:
(0000000000008000) HI		IS	#8000
(0000000000000001) MH		IS	#0001
                   
                   		PREFIX	:FLASH:
(0000000000008000) HI		IS	#8000		physical address
(0000000000000002) MH		IS	#0002
(0000000000002000) USERHI		IS	#2000  		virtual mapped address
(0000000000000001) USERML 		IS	#0001
                   
                   		PREFIX	:VRAM:
(0000000000008002) HI		IS	#8002
                   
                   		PREFIX	:IO:
(0000000000008001) HI		IS	#8001
(0000000000000000) Keyboard 	IS	#00
(0000000000000008) Screen		IS	#08
(0000000000000010) Mouse		IS	#10
(0000000000000020) GPU		IS	#20
                   
(0000000000000080) Sevenseg	IS	#80
(0000000000000090) Timer		IS	#90
(00000000000000b0) Led0		IS	#B0
(00000000000000b8) Led1		IS	#B8
(00000000000000c0) Led2		IS	#C0
(00000000000000c8) Led3		IS	#C8
(00000000000000d0) Serial		IS	#D0
                   
                   		PREFIX	:Interrupt:
(000000000000002c) Timer		IS	44
(000000000000002d) SerialIn 	IS	45
(0000000000000030) Button		IS	48
                   
                   %	Code
                   
                   		.section    .text,"ax",@progbits		
                   		LOC	#8000000000000000
                   
                   		PREFIX :Boot:
($000)             tmp		IS	$0
                   	
                   %	page table setup (see small model in address.howto)
                   
(8000000000000000) :Main		IS	@  dummy	%Main, to keep mmixal happy
8000000000000000:  :Boot		GETA	tmp,:DTrap	%set dynamic- and forced-trap  handler
 ...000: f400xxxx
 ...004: f60e0000  		PUT	:rTT,tmp
 ...008: f400xxxx  		GETA	tmp,:FTrap
 ...00c: f60d0000  		PUT	:rT,tmp
 ...010: f200xxxx  		PUSHJ	tmp,:memory	%initialize the memory setup
                   
 ...014: fe000010  		GET	tmp,:rQ
 ...018: f7100000  		PUT    :rQ,0		%clear interrupts
                   
                   %	here we start a loaded user program
                   %       rXX should be #FB0000FF = UNSAVE $255
                   %	rBB is coppied to $255, it should be the place in the stack 
                   %	where UNSAVE will find its data
                   %	rWW should be the entry point in the main program, 
                   %	thats where the program
                   %	continues after the UNSAVE.
                   %	If no program is loaded, rXX will be 0, that is TRAP 0,Halt,0
                   %	and we end the program before it has started in the Trap handler.
                   
 ...01c: 35ff0001  		NEG	$255,1	% enable interrupt $255->rK with resume 1
 ...020: f9000001  		RESUME	1	% loading a file sets up special registers for that
                   
                   %	Dynamic Trap Handling
                   
                   		PREFIX	:DTrap:
                   	
 ...024: f2ffxxxx  :DTrap		PUSHJ	$255,Handler
 ...028: f60400ff  		PUT	:rJ,$255
 ...02c: 35ff0001  		NEG	$255,1		% enable interrupt $255->rK with resume 1
 ...030: f9000001  		RESUME	1
                   
($000)             tmp		IS	$0	
($001)             ibits		IS	$1
($002)             inumber 	IS	$2
($003)             base		IS	$3
                   
 ...034: fe010010  Handler 	GET 	ibits,:rQ
 ...038: 27000101  		SUBU	tmp,ibits,1		%from xxx...xxx1000 to xxx...xxx0111
 ...03c: da020001  		SADD	inumber,tmp,ibits	%position of lowest bit
 ...040: ca000100  		ANDN	tmp,ibits,tmp	%the lowest bit
 ...044: ca000100      		ANDN	tmp,ibits,tmp	%delete lowest bit
 ...048: f6100000  		PUT	:rQ,tmp		%and return to rQ
 ...04c: 3b000202  		SLU	tmp,inumber,2		%scale
 ...050: f403xxxx          	GETA	base,Table		%and jump
 ...054: 9e000300  		GO	tmp,base,tmp
                   
                   	
 ...058: f0xxxxxx  Table		JMP Reboot		%0	the machine bits
 ...05c: f0xxxxxx  		JMP MemParityError	%1
 ...060: f0xxxxxx  		JMP MemNonExiistent	%2
 ...064: f0xxxxxx  		JMP PowerFail		%3
 ...068: f0xxxxxx  		JMP PageTableError	%4
 ...06c: f0xxxxxx  		JMP Unhandled		%5
 ...070: f0xxxxxx  		JMP Unhandled		%6
 ...074: f0xxxxxx  		JMP Intervall		%7
                   
 ...078: f0xxxxxx  		JMP Unhandled  %8
 ...07c: f0xxxxxx  		JMP Unhandled  %9
 ...080: f0xxxxxx  		JMP Unhandled  %10
 ...084: f0xxxxxx  		JMP Unhandled  %11
 ...088: f0xxxxxx  		JMP Unhandled  %12
 ...08c: f0xxxxxx  		JMP Unhandled  %13
 ...090: f0xxxxxx  		JMP Unhandled  %14
 ...094: f0xxxxxx  		JMP Unhandled  %15
                   
 ...098: f0xxxxxx  		JMP Unhandled  %16
 ...09c: f0xxxxxx  		JMP Keyboard   %17
 ...0a0: f0xxxxxx  		JMP Screen     %18
 ...0a4: f0xxxxxx  		JMP Mouse      %19
 ...0a8: f0xxxxxx  		JMP GPU	       %20
 ...0ac: f0xxxxxx  		JMP Timer      %21
 ...0b0: f0xxxxxx  		JMP Disk       %22
 ...0b4: f0xxxxxx  		JMP Unhandled  %23
 ...0b8: f0xxxxxx  		JMP Unhandled  %24
 ...0bc: f0xxxxxx  		JMP Unhandled  %25
 ...0c0: f0xxxxxx  		JMP Unhandled  %26
 ...0c4: f0xxxxxx  		JMP Unhandled  %27
 ...0c8: f0xxxxxx  		JMP Unhandled  %28
 ...0cc: f0xxxxxx  		JMP Unhandled  %29
 ...0d0: f0xxxxxx  		JMP Unhandled  %30
 ...0d4: f0xxxxxx  		JMP Unhandled  %31
                   
 ...0d8: f0xxxxxx  		JMP Privileged		%32	% Program bits
 ...0dc: f0xxxxxx  		JMP Security		%33
 ...0e0: f0xxxxxx  		JMP RuleBreak		%34
 ...0e4: f0xxxxxx  		JMP KernelOnly		%35
 ...0e8: f0xxxxxx  		JMP TanslationBypass	%36
 ...0ec: f0xxxxxx  		JMP NoExec		%37
 ...0f0: f0xxxxxx  		JMP NoWrite		%38
 ...0f4: f0xxxxxx  		JMP NoRead		%39
                   
 ...0f8: f0xxxxxx  		JMP Unhandled  %40
 ...0fc: f0xxxxxx  		JMP Unhandled  %41
 ...100: f0xxxxxx  		JMP Unhandled  %42
 ...104: f0xxxxxx  		JMP Unhandled  %43
 ...108: f0xxxxxx  		JMP Unhandled  %44
 ...10c: f0xxxxxx  		JMP Unhandled  %45
 ...110: f0xxxxxx  		JMP Unhandled  %46
 ...114: f0xxxxxx  		JMP Unhandled  %47
                   
 ...118: f0xxxxxx  		JMP Button     %48
 ...11c: f0xxxxxx  		JMP Unhandled  %49
 ...120: f0xxxxxx  		JMP Unhandled  %50
 ...124: f0xxxxxx  		JMP Unhandled  %51
 ...128: f0xxxxxx  		JMP Unhandled  %52
 ...12c: f0xxxxxx  		JMP Unhandled  %53
 ...130: f0xxxxxx  		JMP Unhandled  %54
 ...134: f0xxxxxx  		JMP Unhandled  %55
 ...138: f0xxxxxx  		JMP Unhandled  %56
 ...13c: f0xxxxxx  		JMP Unhandled  %57
 ...140: f0xxxxxx  		JMP Unhandled  %58
 ...144: f0xxxxxx  		JMP Unhandled  %59
 ...148: f0xxxxxx  		JMP Unhandled  %60
 ...14c: f0xxxxxx  		JMP Unhandled  %61
 ...150: f0xxxxxx  		JMP Unhandled  %62
 ...154: f0xxxxxx  		JMP Unhandled  %63
 ...158: f0xxxxxx  		JMP Ignore     %64  rQ was zero
                   
                   %	Default Dynamic Trap Handlers
                   
 ...15c: f400xxxx  Unhandled	GETA	tmp,1F
 ...160: fd000005  		SWYM	tmp,5		% tell the debugger
 ...164: f8000000  		POP	0,0
 ...168: 44454255  1H		BYTE    "DEBUG Trap unhandled",0
 ...16c: 47205472
 ...170: 61702075
 ...174: 6e68616e
 ...178: 646c6564
 ...17c: 00      
                   
 ...180: f8000000  Ignore		POP	0,0
                   
                   %	Required Dynamic Trap Handlers
                   
 ...184: f400xxxx  Reboot		GETA	tmp,1F
 ...188: fd000005  		SWYM	tmp,5		% tell the debugger
 ...18c: f0xxxxxx  		JMP	Boot
 ...190: 44454255  1H		BYTE    "DEBUG Rebooting",0
 ...194: 47205265
 ...198: 626f6f74
 ...19c: 696e6700
                   
                   
 ...1a0: f400xxxx  MemParityError	GETA	tmp,1F
 ...1a4: fd000005  		SWYM	tmp,5		% tell the debugger
 ...1a8: f8000000  		POP	0,0
 ...1ac: 44454255  1H		BYTE    "DEBUG Memory parity error",0
 ...1b0: 47204d65
 ...1b4: 6d6f7279
 ...1b8: 20706172
 ...1bc: 69747920
 ...1c0: 6572726f
 ...1c4: 7200    
                   
                   
 ...1c8: f400xxxx  MemNonExiistent	GETA	tmp,1F
 ...1cc: fd000005  		SWYM	tmp,5		% tell the debugger
 ...1d0: f8000000  		POP	0,0
 ...1d4: 44454255  1H		BYTE    "DEBUG Access to nonexistent Memory",0
 ...1d8: 47204163
 ...1dc: 63657373
 ...1e0: 20746f20
 ...1e4: 6e6f6e65
 ...1e8: 78697374
 ...1ec: 656e7420
 ...1f0: 4d656d6f
 ...1f4: 727900  
                   
                   
 ...1f8: f400xxxx  PowerFail	GETA	tmp,1F
 ...1fc: fd000005  		SWYM	tmp,5		% tell the debugger
 ...200: f8000000  		POP	0,0
 ...204: 44454255  1H		BYTE    "DEBUG Power Fail - switching to battery ;-)",0
 ...208: 4720506f
 ...20c: 77657220
 ...210: 4661696c
 ...214: 202d2073
 ...218: 77697463
 ...21c: 68696e67
 ...220: 20746f20
 ...224: 62617474
 ...228: 65727920
 ...22c: 3b2d2900
                   
                   
 ...230: f400xxxx  PageTableError	GETA	tmp,1F
 ...234: fd000005  		SWYM	tmp,5		% tell the debugger
 ...238: f8000000  		POP	0,0
 ...23c: 44454255  1H		BYTE    "DEBUG Error in page table structure",0
 ...240: 47204572
 ...244: 726f7220
 ...248: 696e2070
 ...24c: 61676520
 ...250: 7461626c
 ...254: 65207374
 ...258: 72756374
 ...25c: 75726500
                   
                   
 ...260: f400xxxx  Intervall	GETA	tmp,1F
 ...264: fd000005  		SWYM	tmp,5		% tell the debugger
 ...268: f8000000  		POP	0,0
 ...26c: 44454255  1H		BYTE    "DEBUG Intervall Counter rI is zero",0
 ...270: 4720496e
 ...274: 74657276
 ...278: 616c6c20
 ...27c: 436f756e
 ...280: 74657220
 ...284: 72492069
 ...288: 73207a65
 ...28c: 726f00  
                   
                   
                   
 ...290: f400xxxx  Privileged	GETA	tmp,1F
 ...294: fd000005  		SWYM	tmp,5		% tell the debugger
 ...298: f8000000  		POP	0,0
 ...29c: 44454255  1H		BYTE    "DEBUG Privileged Instruction",0
 ...2a0: 47205072
 ...2a4: 6976696c
 ...2a8: 65676564
 ...2ac: 20496e73
 ...2b0: 74727563
 ...2b4: 74696f6e
 ...2b8: 00      
                   
                   
 ...2bc: f400xxxx  Security	GETA	tmp,1F
 ...2c0: fd000005  		SWYM	tmp,5		% tell the debugger
 ...2c4: f8000000  		POP	0,0
 ...2c8: 44454255  1H		BYTE    "DEBUG Security violation",0
 ...2cc: 47205365
 ...2d0: 63757269
 ...2d4: 74792076
 ...2d8: 696f6c61
 ...2dc: 74696f6e
 ...2e0: 00      
                   
                   
 ...2e4: f400xxxx  RuleBreak	GETA	tmp,1F
 ...2e8: fd000005  		SWYM	tmp,5		% tell the debugger
 ...2ec: f8000000  		POP	0,0
 ...2f0: 44454255  1H		BYTE    "DEBUG Illegal Instruction",0
 ...2f4: 4720496c
 ...2f8: 6c656761
 ...2fc: 6c20496e
 ...300: 73747275
 ...304: 6374696f
 ...308: 6e00    
                   
                   
 ...30c: f400xxxx  KernelOnly	GETA	tmp,1F
 ...310: fd000005  		SWYM	tmp,5		% tell the debugger
 ...314: f8000000  		POP	0,0
 ...318: 44454255  1H		BYTE    "DEBUG Instruction for kernel use only",0
 ...31c: 4720496e
 ...320: 73747275
 ...324: 6374696f
 ...328: 6e20666f
 ...32c: 72206b65
 ...330: 726e656c
 ...334: 20757365
 ...338: 206f6e6c
 ...33c: 7900    
                   
                   
 ...340: f400xxxx  TanslationBypass GETA	tmp,1F
 ...344: fd000005  		SWYM	tmp,5		% tell the debugger
 ...348: f8000000  		POP	0,0
 ...34c: 44454255  1H		BYTE    "DEBUG Illegal access to negative address",0
 ...350: 4720496c
 ...354: 6c656761
 ...358: 6c206163
 ...35c: 63657373
 ...360: 20746f20
 ...364: 6e656761
 ...368: 74697665
 ...36c: 20616464
 ...370: 72657373
 ...374: 00      
                   
                   
 ...378: f400xxxx  NoExec		GETA	tmp,1F
 ...37c: fd000005  		SWYM	tmp,5		% tell the debugger
 ...380: f8000000  		POP	0,0
 ...384: 44454255  1H		BYTE    "DEBUG Missing execute permission",0
 ...388: 47204d69
 ...38c: 7373696e
 ...390: 67206578
 ...394: 65637574
 ...398: 65207065
 ...39c: 726d6973
 ...3a0: 73696f6e
 ...3a4: 00      
                   
                   
 ...3a8: f400xxxx  NoWrite		GETA	tmp,1F
 ...3ac: fd000005  		SWYM	tmp,5		% tell the debugger
 ...3b0: f8000000  		POP	0,0
 ...3b4: 44454255  1H		BYTE    "DEBUG  Missing write permission",0
 ...3b8: 4720204d
 ...3bc: 69737369
 ...3c0: 6e672077
 ...3c4: 72697465
 ...3c8: 20706572
 ...3cc: 6d697373
 ...3d0: 696f6e00
                   
                   
 ...3d4: f400xxxx  NoRead		GETA	tmp,1F
 ...3d8: fd000005  		SWYM	tmp,5		% tell the debugger
 ...3dc: f8000000  		POP	0,0
 ...3e0: 44454255  1H		BYTE    "DEBUG Missing read permission",0
 ...3e4: 47204d69
 ...3e8: 7373696e
 ...3ec: 67207265
 ...3f0: 61642070
 ...3f4: 65726d69
 ...3f8: 7373696f
 ...3fc: 6e00    
                   
                   
                   %	Devicespecific Dynamic Trap Handlers
                   
                   		PREFIX	Keyboard:
                   
($001)             base		IS	$1
($002)             data		IS	$2
($003)             count		IS	$3
($004)             return		IS	$4
($005)             tmp		IS	$5
                   %	echo a character from the keyboard
 ...400: e0018001  :DTrap:Keyboard	SETH	base,:IO:HI    			
 ...404: 8d020100  		LDO	data,base,:IO:Keyboard	keyboard status/data
 ...408: 4002xxxx  		BN	data,1F	
 ...40c: 3d030220  		SR	count,data,32
 ...410: c90303ff  		AND	count,count,#FF
 ...414: 4203xxxx  		BZ	count,1F	
 ...418: fe040004  		GET	return,:rJ
 ...41c: c90602ff  		AND	tmp+1,data,#FF
 ...420: f205xxxx  		PUSHJ	tmp,:ScreenC
 ...424: f6040004  		PUT	:rJ,return
 ...428: f8000000  1H		POP	0,0
                   
****************** :DTrap:Screen   IS 	:Dtrap:Ignore   
********** error: relative address in location #80000000000000a0 is too far away!
(8000000000000180) :Dtrap:Mouse	IS	:DTrap:Ignore 
(8000000000000180) :DTrap:GPU	IS	:DTrap:Ignore
(8000000000000180) :DTrap:Timer    IS	:DTrap:Ignore
(8000000000000180) :DTrap:Disk     IS	:DTrap:Ignore 
(8000000000000180) :DTrap:Button   IS	:DTrap:Ignore 
                   

Symbol table:
 Boot = #8000000000000000 (32)
 Boot:tmp = $000 (30)
 DTrap = #8000000000000024 (31)
 DTrap:Boot = ? (65)
 DTrap:Button = #8000000000000180 (63)
 DTrap:Disk = #8000000000000180 (54)
 DTrap:GPU = #8000000000000180 (52)
 DTrap:Handler = #8000000000000034 (36)
 DTrap:Ignore = #8000000000000180 (64)
 DTrap:Intervall = #8000000000000260 (48)
 DTrap:KernelOnly = #800000000000030c (58)
 DTrap:Keyboard = #8000000000000400 (49)
 DTrap:Keyboard:base = $001 (67)
 DTrap:Keyboard:count = $003 (69)
 DTrap:Keyboard:data = $002 (68)
 DTrap:Keyboard:return = $004 (70)
 DTrap:Keyboard:tmp = $005 (71)
 DTrap:MemNonExiistent = #80000000000001c8 (44)
 DTrap:MemParityError = #80000000000001a0 (43)
 DTrap:Mouse = ? (51)
 DTrap:NoExec = #8000000000000378 (60)
 DTrap:NoRead = #80000000000003d4 (62)
 DTrap:NoWrite = #80000000000003a8 (61)
 DTrap:PageTableError = #8000000000000230 (46)
 DTrap:PowerFail = #80000000000001f8 (45)
 DTrap:Privileged = #8000000000000290 (55)
 DTrap:Reboot = #8000000000000184 (42)
 DTrap:RuleBreak = #80000000000002e4 (57)
 DTrap:Security = #80000000000002bc (56)
 DTrap:Table = #8000000000000058 (41)
 DTrap:TanslationBypass = #8000000000000340 (59)
 DTrap:Timer = #8000000000000180 (53)
 DTrap:Unhandled = #800000000000015c (47)
 DTrap:base = $003 (40)
 DTrap:ibits = $001 (38)
 DTrap:inumber = $002 (39)
 DTrap:tmp = $000 (37)
 Dtrap:Mouse = #8000000000000180 (74)
 FLASH:HI = #0000000000008000 (6)
 FLASH:MH = #0000000000000002 (7)
 FLASH:USERHI = #0000000000002000 (8)
 FLASH:USERML = #0000000000000001 (9)
 FTrap = ? (33)
 IO:GPU = #0000000000000020 (17)
 IO:HI = #0000000000008001 (13)
 IO:Keyboard = #0000000000000000 (14)
 IO:Led0 = #00000000000000b0 (20)
 IO:Led1 = #00000000000000b8 (21)
 IO:Led2 = #00000000000000c0 (22)
 IO:Led3 = #00000000000000c8 (23)
 IO:Mouse = #0000000000000010 (16)
 IO:Screen = #0000000000000008 (15)
 IO:Serial = #00000000000000d0 (24)
 IO:Sevenseg = #0000000000000080 (18)
 IO:Timer = #0000000000000090 (19)
 Interrupt:Button = #0000000000000030 (28)
 Interrupt:SerialIn = #000000000000002d (27)
 Interrupt:Timer = #000000000000002c (26)
 Main = #8000000000000000 (1)
 RAM:HI = #0000000000008000 (3)
 RAM:MH = #0000000000000001 (4)
 ScreenC = ? (72)
 VRAM:HI = #0000000000008002 (11)
 memory = ? (34)