TempleOSCDV4.05.ISO

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Terry A. Davis authored and minexew committed 2018-09-08 21:47:13 +02:00
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@@ -2,7 +2,7 @@ $WW,1$$FG,5$$TX+CX,"Memory Overview"$$FG$
Paging is practically not used. 64-bit mode requires paging, however, so it is identity-mapped, virtual identical to physical. All tasks on all cores use the same page table map, just as though all addresses are physical addresses. 2 Meg page table entries are used, except the first 2 Meg, which uses 4K page tables entries. Nothing swaps to disk, either.
In TempleOS, the lowest 2 Gig of memory is called the $FG,2$code heap$FG$. TempleOS's compiler always uses 32-bit signed relative JMP & CALL instructions because 64-bit CALLs take two instructions. With signed +/- 32-bit values, code can only call a function within 2 Gig distance. Therefore, TempleOS keeps all code in the lowest 2 Gig memory addresses including what would normally be called "the kernel". Two Gig is plenty for code, don't worry.
In TempleOS, the lowest 2 Gig of memory is called the $FG,2$code heap$FG$. TempleOS's compiler always uses 32-bit signed relative JMP & CALL insts because 64-bit CALLs take two insts. With signed +/- 32-bit values, code can only call a function within 2 Gig distance. Therefore, TempleOS keeps all code in the lowest 2 Gig memory addresses including what would normally be called "the kernel". Two Gig is plenty for code, don't worry.
You can create new, independent heaps using $LK,"HeapCtrlInit",A="MN:HeapCtrlInit"$(). Then, use the $LK,"CHeapCtrl",A="MN:CHeapCtrl"$ as the 2nd arg to $LK,"MAlloc",A="MN:MAlloc"$(). See $LK,"HeapLog",A="MN:HeapLog"$() for an example.