OS_ReadSysInfo 6 Items (changes)
Showing changes from revision #11 to #12:
Added | Removed | Changed
OS SWI Calls
» OS_ReadSysInfo
» OS_ReadSysInfo 6
» Items
Items
| Item | OS version | Value |
|---|---|---|
| 0 | 3.80+ | Address of CamEntriesPtr |
| 1 | 3.80+ | Address of MaxCamEntry |
| 2 | 3.80+ | PageFlags_Unavailable |
| 3 | 3.80+ | Address of PhysRamTable |
| 4 | 3.80+ | ARMA_Cleaner_flipflop1 |
| 5 | 3.80+ | Address of TickNodeChain |
| 6 | 3.80+ | Address of ROMModuleChain |
| 7 | 3.80+ | Address of DAList |
| 8 | 3.80+ | Address of AppSpaceDANode |
| 9 | 3.80+ | Address of Module_List |
| 10 | 3.80+ | Address of ModuleSHT_Entries |
| 11 | 3.80+ | Address of ModuleSWI_HashTab |
| 12 | 3.80+ | Address of IOSystemType3 |
| 13 | 3.80+ | Level 1 page table pointer (L1PT) |
| 14 | 3.80+ | Level 2 page table pointer (L2PT) |
| 15 | 3.80+ | Address of top of UND stack |
| 16 | 3.80+ | Address of top of SVC stack |
| 17 | 3.80+ | SysHeapStart |
| 18 | ROL2 | Address of kernel MessageTrans block |
| 5.00+ | Address of SWI dispatch table | |
| 19 | ROL2 | Address of error semaphore |
| 5.00+ | Base of IRQ device head nodes | |
| 20 | ROL2 | Address of OS_PrettyPrint dictionary |
| 5.00+ | End of IRQ device head nodes | |
| 21 | ROL2 | Address of timer 0 latch value |
| 5.00+ | Address of top of IRQ stack | |
| 22 | ROL2 | FastTickerV counts per second |
| 5.00+ | SoundWorkSpace | |
| 23 | ROL2 | Address of vector claimants table |
| 5.00+ | Address of IRQsema | |
| 24 | ROL2 | Number of vectors supported |
| 5.27+ | ||
| 25 | ROL2 | Address of top of IRQ stack |
| 5.27+ | ||
| 26 | ROL2 | Address of SWI dispatch table |
| 5.27+ | ||
| 27 | ROL2 | Address of branch back to OS after SWIs |
| 5.27+ | ||
| 28-63 | - | Reserved for RISCOS Ltd. |
| 64 | 5.17+ | Address of SWI dispatch table |
| 65 | 5.17+ | Base of IRQ device head nodes |
| 66 | 5.17+ | End of IRQ device head nodes |
| 67 | 5.17+ | Address of top of IRQ stack |
| 68 | 5.17+ | SoundWorkSpace |
| 69 | 5.17+ | Address of IRQsema |
| 70 | 5.17+ | Address of DomainId |
| 71 | 5.17+ | Address of OS byte variables |
| 72 | 5.17+ | Address of Foreground ECF OraEor block |
| 73 | 5.17+ | Address of Background ECF OraEor block |
| 74 | 5.17+ | Base of debugger space |
| 75 | 5.17+ | Size of debugger space |
| 76 | 5.17+ | Address of CannotReset |
| 77 | 5.17+ | Address of MetroGnome (OS_ReadMonotonicTime counter) |
| 78 | 5.17+ | Address of CLibCounter |
| 79 | 5.17+ | Address of RISCOSLibWord |
| 80 | 5.17+ | Address of CLibWord |
| 81 | 5.17+ | Address of FPEAnchor |
| 82 | 5.17+ | Address of ESC_Status |
| 83 | 5.21+ | Address of ECFYOffset |
| 84 | 5.21+ | Address of ECFShift |
| 85 | 5.23+ | Address of vector claimants table |
| 86 | 5.23+ | Number of vectors supported |
| 88 | 5.29+ | Address of top of ABT stack |
| 89 | 5.29+ | PhysRamTable format (0 = addresses are in byte units, 1 = addresses are in 4KB units) |
| 90-127 | - | Reserved for ROOL |
1 Unused in RISC OS 5; returns zero.
2 Refers to OS versions released by RISC OS Ltd, i.e. RISC OS 4 & RISC OS 6.
3 Unused in RISC OS 5.23; returns zero. In previous versions of RISC OS 5 the item was supported but the value of the variable pointed to was zero.
Notes
This call was introduced in RISC OS 3.80, which supported items 0-17. Later versions of RISC OS introduced additional items. However lack of communication between different development teams has lead to values 18-23 being used for different purposes in different OS versions.
Starting with RISC OS 5.17, items 18-23 have been duplicated into items 64-69. This allows new software aimed at 5.17+ to read the values without risk of accidentally reading the wrong values when used on versions of RISC OS Ltd’s OS.
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