$WW,1$$FG,5$$TX+CX,"Memory Overview"$$FG$

Paging is almost not used, but 64-bit mode requires it to be active.  Virtual is identity-mapped 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, don't worry.

You can create new, independent heaps by first allocating mem with $LK,"MemBlksUncachedAlloc",A="MN:MemBlksUncachedAlloc"$() or $LK,"MemBlksIndependentAlloc",A="MN:MemBlksIndependentAlloc"$(), then calling $LK,"HeapCtrlBPInit",A="MN:HeapCtrlBPInit"$() and, then, using $LK,"MAlloc",A="MN:MAlloc"$().

Memory allocated by a task will be freed when the task is killed.

Eventually, memory will become fragmented, requiring a reboot.

See $LK,"MemRep",A="MN:MemRep"$().

$FG,5$$TX+CX,"Single System-wide Mem Map"$

$FG,2$ 0x0000000000- 0x00$TX,"00006FFF",D="DD_PROTECTED_LOW"$$FG$
$ID,2$Pages marked not present so NULL ptr dereference causes a fault.
$ID,-2$
$FG,2$ 0x00$TX,"00007C00",D="DD_KERNEL"$- 0x00$TX,"000360CF",D="DD_KERNEL_END"$$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$TX,"00096600",D="DD_BOOT_HIGH_LOC"$- 0x00$TX,"00096FFF",D="DD_BOOT_HIGH_LOC_END"$$FG$
$ID,2$$FG$Boot block relocated here before loading the Kernel module, $LK,"BootCD",A="FI:::/Adam/Boot/BootCD.CPP"$ & $LK,"BootHD",A="FI:::/Adam/Boot/BootHD.CPP"$.
$ID,-2$
$FG,2$ 0x00$TX,"00097000",D="DD_MP_VECT"$- 0x00$TX,"0009702E",D="DD_MP_VECT_END"$$FG$
$ID,2$Multicore start-up vect code, $LK,"MPN_VECT",A="MN:MPN_VECT"$.
$ID,-2$
$FG,2$~0x000009F000- 0x000009FFFF
$ID,2$$FG$Extended BIOS data area.
$ID,-2$
$FG,2$ 0x00000A0000- 0x00000BFFFF$FG$
$ID,2$VGA graphics mem, marked as write-through cache.
$ID,-2$
$FG,2$ 0x00$TX,"00100000",D="DD_FIXED_AREA_BASE"$- 0x00$TX,"001845FF",D="DD_FIXED_AREA_END"$$FG$
$ID,2$$LK,"CSysFixedArea",A="MN:CSysFixedArea"$ for page tables and misc.  $TX,"128 Gig",D="DD_MAPPED_MEM_SPACE_GIG"$ of address space mapped.
$ID,-2$
$FG,2$ 0x00$TX,"00184600",D="DD_SYS_HEAP_BASE"$- 0x00$TX,"7FFFFFFF",D="DD_SYS_HEAP_LIMIT"$$FG$
$ID,2$Code Heap mem.
$ID,-2$
$FG,2$ 0x00E0000000- 0x00FFFFFFFF$FG$
$ID,2$32-bit devices could allocate memory at 0xF0000000 going up, but this is wrong, since some PCs already have devices at 0xF0000000.  No PCI devices are supported, so $LK,"Mem32DevAlloc",A="MN:Mem32DevAlloc"$() flaws are not an issue.
$ID,-2$
$FG,2$ 0x0080000000-~0x00DFFFFFFF$FG$
$FG,2$ 0x0100000000-~0x$TX,"1FFFFFFFFF",D="DD_MAPPED_MEM_SPACE_END"$$FG$
$ID,2$Data Heap mem.
$ID,-2$
$FG,2$             - 0x$TX,"1FFFFFFFFF",D="DD_MAPPED_MEM_SPACE_END"$$FG$$FG$
$ID,2$64-bit devices are allocated with $LK,"Mem64DevAlloc",A="MN:Mem64DevAlloc"$() counting bwd from $TX,"128 Gig",D="DD_MAPPED_MEM_SPACE_GIG"$, but no PCI devices are actually supported$WW,0$.
$ID,-2$
$WW,0$
				      $LK,"CBlkPool",A="MN:CBlkPool"$s $LK,"CHeapCtrl",A="MN:CHeapCtrl"$s
$SP,"",BI=1$



0000,0000,0000,0000 *NULL Protected
0000,0000,$TX,"0000,6FFF",D="DD_PROTECTED_LOW2"$		      Core 0

0000,0000,$TX,"0000,7C00",D="DD_KERNEL2"$ Kernel
0000,0000,$TX,"0003,60CF",D="DD_KERNEL_END2"$ 

0000,0000,$TX,"0010,0000",D="DD_FIXED_AREA_BASE2"$ FIXED_AREA			   AdamTask

$FG,1$0000,0000,$TX,"0018,4600",D="DD_SYS_HEAP_BASE2"$

		    sys_code_bp

						   $FG$Task




				      Core 1
						   SethTask

$FG,1$0000,0000,$TX,"7FFF,FFFF",D="DD_SYS_HEAP_LIMIT2"$
$FG,10$0000,0000,8000,0000


$FG,10$
		    sys_data_bp
						   $FG$Task
$FG,10$0000,0000,DFFF,FFFF 
$FG,6$0000,0000,F000,0000 32-bit devices

$FG,10$0000,0001,0000,0000
$FG$
						   SethTask



$FG,10$
		    sys_data_bp$FG,0$       Core n 



$FG,4$
				      Independent



$FG,6$
		    64-bit devices

0000,$TX,"001F,FFFF,FFFF",D="DD_MAPPED_MEM_SPACE_END2"$

$WW,1$$FG$* Note: There is a break in the data-heap block pool.  This has no effect except the obvious effect that fragmentation has on contiguous requests.  I can $LK,"MAlloc",A="MN:MAlloc"$() an 8 Gig chunk on my 12 Gig machine.

* Note: For systems with less than 2 Gig RAM, the code and data heap block pools are the same.  For systems with 2-4 Gig of RAM, the code heap is 1/4 of the total.  See $LK,"HeapsInit",A="MN:HeapsInit"$().

* See $LK,"Independent Heap Ctrl Example",A="FA:::/Kernel/KEnd.CPP,Independent Heap Ctrl Example"$.
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