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TempleOSCDV4.03.ISO

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Terry A. Davis authored and minexew committed 2018-09-08 21:47:01 +02:00
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commit 0f1a4a5d65
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Doc/MemOverview.TXT
+3 -3
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@@ -4,7 +4,7 @@ Paging is practically not used. 64-bit mode requires paging, however, so it is
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.
You can create new, independent heaps by first allocating mem with $LK,"Mem2MegUncachedAlloc",A="MN:Mem2MegUncachedAlloc"$() or $LK,"Mem512Alloc",A="MN:Mem512Alloc"$(), then calling $LK,"HeapCtrlBPInit",A="MN:HeapCtrlBPInit"$() and, then, using $LK,"MAlloc",A="MN:MAlloc"$().
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.
Memory alloced by a task will be freed when the task is killed.
@@ -17,7 +17,7 @@ $FG,5$$TX+CX,"Single System-wide Mem Map"$
$FG,2$ 0x0000000000- 0x00$TX,"00006FFF",D="DD_PROTECTED_LOW"$$FG$
$ID,2$Pages marked not present so NULL ptr dereference causes a fault.
$ID,-2$
$FG,2$ 0x00$TX,"00007C00",D="DD_KERNEL"$- 0x00$TX,"00034E7F",D="DD_KERNEL_END"$$FG$
$FG,2$ 0x00$TX,"00007C00",D="DD_KERNEL"$- 0x00$TX,"0003460F",D="DD_KERNEL_END"$$FG$
$ID,2$Kernel module, placed here by the boot-loader, $LK,"BOOT_RAM_BASE",A="MN:BOOT_RAM_BASE"$.
$ID,-2$
$FG,2$ 0x00$TX,"00096600",D="DD_BOOT_HIGH_LOC_DVD"$- 0x00$TX,"00096FFF",D="DD_BOOT_HIGH_LOC_DVD_END"$$FG$
@@ -35,7 +35,7 @@ $ID,-2$
$FG,2$ 0x00$TX,"00100000",D="DD_SYS_FIXED_AREA_BASE"$- 0x00$TX,"001845FF",D="DD_SYS_FIXED_AREA_END"$$FG$
$ID,2$$LK,"CSysFixedArea",A="MN:CSysFixedArea"$ for page tables and misc. $TX,"128 Gig",D="DD_MEM_MAPPED_SPACE_GIG"$ of address space mapped.
$ID,-2$
$FG,2$ 0x00$TX,"00184600",D="DD_SYS_HEAP_BASE"$- 0x00$TX,"7FFFFFFF",D="DD_SYS_HEAP_LIMIT"$$FG$
$FG,2$ 0x00$TX,"00184600",D="DD_SYS_HEAP_BASE"$- 0x00$TX,"3FFE3DFF",D="DD_SYS_HEAP_LIMIT"$$FG$
$ID,2$Code Heap mem.
$ID,-2$
$FG,2$ - 0x007FFFFFFF$FG$