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Text File | 1996-10-06 | 13.8 KB | 497 lines

This is an incomplete list of the allocation of address space in 'zero page'. It is currently maintained by Matthew Wilcox <mrw103@york.ac.uk> and is available as ftp://ftp.barnet.ac.uk/pub/Acorn/zeropage.txt or as http://www.york.ac.uk/~mrw103/zeropage.txt. If you can't get it using either of these methods then mail me, asking *nicely*. Please mail me any corrections or additions to me so they can be incorporated into the list. I would be particularly interested in differences in other versions of RISC OS. Last updated on Mon 07th October 1996 Credits (alphabetically): Carol Carpenter for providing space on Barnet's FTP site for this document Ben Dooks for telling me the base of the Vector table & for writing VecList Nick Smith for reading RAM speed & MEMC type from zero page in !ArmSI Mark Wooding for mentioning that DDEUtils frobbed around in zero page All addresses are given in hexadecimal and refer to the start of the word containing the value. Where a range is given, it is given to the beginning of the last word in the range. These addresses were valid on my 4Mb A440 running RISC OS 3.1. None of them are guaranteed to remain in the same place between different versions of the OS. Some will definitely be different under RISC OS 3.5+. Always use the defined system interfaces in preference to direct accesses if possible. No liability is assumed for any loss or damage which may result as the result of yourself or others use or misuse of the information contained in this document. Address Contents 0 Branch Through Zero handler 4 Undefined Instruction handler 8 Software Interrupt handler C Prefetch Abort handler 10 Data Abort handler 14 Address Exception handler 18 IRQ handler 1C - FC FIQ routine 100 Address called by ROM IRQ handler routine. (&C34) 104 Bit 4 Escape condition occured 108 Value of R13_irq after last IRQ happened 10C Monotonic time 110 Byte 0 } RAM speed Byte 1 } Bit 16 MEMC1 if clear, MEMC1a if set 114 Bit 2 } used by OS_SetMemMapEntries. Not understood how. Bit 3 } 118 [has value 0. Is it unused?] 11C MemoryLimit value 120 Undefined instruction handler address 124 Prefetch abort handler address 128 Data abort handler address 12C Address exception handler address 130 Error handler address 134 Error buffer address 138 R0 on entry to Error handler 13C R12 on entry to CallBack handler 140 CallBack handler address 144 Pointer to CallBack register buffer 148 R12 on entry to BreakPoint handler 14C BreakPoint handler address 150 Pointer to BreakPoint register buffer 154 R12 on entry to Escape handler 158 Escape handler address 15C R12 on entry to Event handler 160 Event handler address 164 - 360 Page tables. Top nybble contains page protection level 364 - 560 Here be dragons. All zero, too. Unused? 564 Address of page tables 568 Highest page number 56C Total amount of RAM in machine in bytes 570 Application space 574 R12 on entry to Unused SWI handler 578 Unused SWI handler address 57C Exit handler address 580 R12 on entry to Exit handler 584 R12 on entry to UpCall handler 588 UpCall handler address 58C 590 594 598 Byte 0 Byte 1 Byte 2 Byte 3 Keyboard ID 59C 5A0 5A4 5A8 5AC 5B0 5B4 5B8 5BC 5C0 Mouse X multiplier 5C4 Mouse Y multiplier 5C8 Address of keyboard handler 5CC - 7CC The Great Swamp 7D0 Pointer to Module chain 7D4 Currently Active Object pointer 7D8 UserV (00) 7DC ErrorV (01) 7E0 IrqV (02) 7E4 WrchV (03) 7E8 RdchV (04) 7EC CLIV (05) 7F0 ByteV (06) 7F4 WordV (07) 7F8 FileV (08) 7FC ArgsV (09) 800 BGetV (0A) 804 BPutV (0B) 808 GBPBV (0C) 80C FindV (0D) 810 ReadLineV (0E) 814 FSCV (0F) 818 EventV (10) 81C *V (11) } 820 *V (12) } These vectors reserved by Acorn 824 *V (13) } 828 InsV (14) 82C RemV (15) 830 CnpV (16) 834 UKVDU23V (17) 838 UKSWIV (18) 83C UKPLOTV (19) 840 MouseV (1A) 844 VDUXV (1B) 848 TickerV (1C) 84C UpcallV (1D) 850 ChngEnvirnmentV (1E) 854 SpriteV (1F) 858 DrawV (20) 85C EconetV (21) 860 ColourV (22) 864 PaletteV (23) 868 SerialV (24) 86C *V (25) } 870 *V (26) } 874 *V (27) } 878 *V (28) } 87C *V (29) } 880 *V (2A) } These vectors reserved by Acorn 884 *V (2B) } 888 *V (2C) } 88C *V (2D) } 890 *V (2E) } 894 *V (2F) } 898 Pointer to exception registers 89C - A38 Garroting Deep A3C Byte 0 Byte 1 Byte 2 Byte 3 [referred to by ROM PaletteV] A40 - AC8 Northron Climbs ACC Current size of sprite area AD0 Current size of RAM filing system AD4 Current size of font cache AD8 Base of OS_CallEvery/CallAfter list ADC first 4 bytes of time that program was started AE0 Byte 0 last byte of time that program was started Byte 1 input file handle Byte 2 output file handle Byte 3 AE4 Bit 8 } [referenced by kernel swi exit routines] Bit 9 } Bit 10 Outstanding OS_AddCallback. Bit 16 IOEB ASIC present Bit 17 82C710 present Bit 18 LCD ASIC present Bit 19 82C711 present AE8-BE4 Program environment string BE8 BEC BF0 BF4 BF8 BFC C00 C04 C08 C0C C10 C14 C18 C1C C20 C24 C28 page size in bytes C2C C30 C34 MOV r3, #&03200000 } C38 LDRB r0, [r3, #36] } C3C CMP r0, #0 } C40 LDREQB r0, [r3, #20] } C44 ADREQ r1, &D24 } IRQ handler routine C48 ADRNE r1, &E24 } C4C LDRB r0, [r1, r0] } C50 ADD r1, pc, r0, LSL #2 } C54 LDMIA r1, {r12, pc} } C58 R12 value for device 0 vector C5C Address of device 0 handler C60 points to next handler for device 0 C64 R12 value for device 1 vector C68 Address of device 1 handler C6C points to next handler for device 1 C70 R12 value for device 2 vector C74 Address of device 2 handler C78 points to next handler for device 2 C7C R12 value for device 3 vector C80 Address of device 3 handler C84 points to next handler for device 3 C88 R12 value for device 4 vector C8C Address of device 4 handler C90 points to next handler for device 4 C94 R12 value for device 5 vector C98 Address of device 5 handler C9C points to next handler for device 5 CA0 R12 value for device 6 vector CA4 Address of device 6 handler CA8 points to next handler for device 6 CAC R12 value for device 7 vector CB0 Address of device 7 handler CB4 points to next handler for device 7 CB8 R12 value for device 8 vector CBC Address of device 8 handler CC0 points to next handler for device 8 CC4 R12 value for device 9 vector CC8 Address of device 9 handler CCC points to next handler for device 9 CD0 R12 value for device 10 vector CD4 Address of device 10 handler CD8 points to next handler for device 10 CDC R12 value for device 11 vector CE0 Address of device 11 handler CE4 points to next handler for device 11 CE8 R12 value for device 12 vector CEC Address of device 12 handler CF0 points to next handler for device 12 CF4 R12 value for device 13 vector CF8 Address of device 13 handler CFC points to next handler for device 13 D00 R12 value for device 14 vector D04 Address of device 14 handler D08 points to next handler for device 14 D0C R12 value for device 15 vector D10 Address of device 15 handler D14 points to next handler for device 15 D18 R12 value for no device D1C address of no device handler D20 points to next handler for no device D24 - E20 IRQ register A priority table E24 - F20 IRQ register B priority table F24 Base of AddCallBack list F28 F2C F30 F34 F38 F3C F40 F44 F48 F4C F50 F54 F58 F5C F60 F64 Unique Machine ID word 0 F68 Unique Machine ID word 1 F6C F70 F74 F78 F7C F80 Byte 0 Kernel flag to prevent reentering MessageTrans_ErrorLookup Byte 1 Byte 2 Byte 3 F84 F88 F8C F90 F94 F98 F9C FA0 FA4 FA8 FAC FB0 FB4 FB8 FBC FC0 FC4 FC8 FCC FD0 FD4 FD8 FDC FE0 FE4 FE8 FEC FF0 FF4 FF8 Bottom 16 bits of task handle FFC It appears to me that everything VDU related is stored after &1000. 1000 1004 1008 100C 1010 1014 1018 101C 1020 1024 1028 102C 1030 1034 1038 103C 1040 GCOL action for foreground colour [151] 1044 GCOL action for background colour [152] 1048 Graphics foreground colour [153] 104C Graphics background colour [154] 1050 Left-hand column of the graphics window [128] 1054 Bottom row of the graphics window [129] 1058 Right-hand column of the graphics window [130] 105C Top row of the graphics window [131] 1060 1064 1068 106C 1070 1074 1078 107C Amount of RAM required by current screen mode 1080 1084 1088 [referenced by RemoveCursors] 108C 1090 [referenced by RemoveCursors] 1094 1098 109C 10A0 [referenced by SetECFOrigin] 10A4 10A8 10AC 10B0 10B4 [referred to by ROM PaletteV] 10B8 10BC 10C0 Address of the start of screen used by VDU drivers [148] 10C4 [referenced by SetECFOrigin] 10C8 10CC 10D0 10D4 10D8 10DC 10E0 Left-hand column of the text window [132] 10E4 Bottom row of the text window [133] 10E8 Right-hand column of the text window {134] 10EC Top row of the text window [135] 10F0 x coordinate of the graphics origin (ec) [136] 10F4 y coordinate of the graphics origin (ec) [137] 10F8 x coordinate of the graphics cursor (ec) [138] 10FC y coordinate of the graphics cursor (ec) [139] 1100 x coordinate of oldest graphics cursor (ic) [140] 1104 y coordinate of oldest graphics cursor (ic) [141] 1108 x coordinate of previous graphics cursor (ic) [142] 110C y coordinate of previous graphics cursor (ic) [143] 1110 x coordinate of the graphics cursor (ic) [144] 1114 y coordinate of the graphics cursor (ic) [145] 1118 x coordinate of new point (ic) [146] 111C y coordinate of new point (ic) [147] 1120 Text foreground colour [155] 1124 Text background colour [156] 1128 112C 1130 [referenced by RemoveCursors] 1134 1138 113C [referenced by RemoveCursors] 1140 1144 1148 114C 1150 1154 1158 1160 1164 1168 116C 1170 1174 1178 Address of the start of screen used by display hardware [149] 117C 1180 1184 Highest logical colour number available in this mode 1188 118C 1190 1194 1198 119C 11A0 11A4 11A8 11AC 11B0 11B4 11B8 11BC 11C0 11C4 11C8 11CC 11D0 Current screen mode number 11D4 Tint for text foreground colour [159] 11D8 Tint for text background colour [160] 11DC Tint for graphics foreground colour [157] 11E0 Tint for graphics background colour [158] 11E4 Amount of memory currently allocated to the screen [150] 11E8 Highest mode number available [161] 11EC 11F0 Bit 0 [referenced by ReadVduVars] Bit 1 [referenced by ReadVduVars] Bit 2 [referenced by ReadVduVars] Bit 3 text printing direction vertical if set Bit 9 Cursor state Bit 21 ChangedBox calculation enabled if set Bit 30 [referenced by ReadVduVars] 11F4 [referenced by RemoveCursors] 11F8 11FC 1200 1204 1208 120C 1210 1214 1218 121C 1220 1224 1228 VIDC clock speed in kHz [172] 122C - 135C Treacher's Gorge 1360 x size of VDU 5 chars (in pixels) [162] 1364 y size of VDU 5 chars (in pixels) [163] 1368 x spacing of VDU 5 chars (in pixels) [164] 136C y spacing of VDU 5 chars (in pixels) [165] 1370 x size of VDU 4 chars (in pixels) [167] 1374 y size of VDU 4 chars (in pixels) [168] 1378 x spacing of VDU 4 chars (in pixels) [169] 137C y spacing of VDU 4 chars (in pixels) [170] 1380 Address of fast line-draw routine [166] 1384 Address of colour blocks for current GCOLs [171] 1388 - 159C Spoiled Plains 15A0 Byte 0 ClaimScreenMemory flag Byte 1 Byte 2 Byte 3 15A4 - 1668 Doriendor Corishev 166C ChangedBox flag word 1670 ChangedBox x coordinate of left edge 1674 ChangedBox y coordinate of bottom edge 1678 ChangedBox x coordinate of right edge 167C ChangedBox y coordinate of top edge 1680 - 3FFC Trackless wastes 4000-7FFC RISC OS scratch space