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Memory Manager D'x

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git-svn-id: https://spexeah.com:8443/svn/Asuro@148 6dbc8c32-bb84-406f-8558-d1cf31a0ab0c
This commit is contained in:
kieron
2017-05-20 19:08:00 +00:00
parent c7968006c9
commit e330bc426b
8 changed files with 32 additions and 20 deletions
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3
src/kernel.pas
View File

@ -50,6 +50,9 @@ begin
isr.init();
irq.init();
pmemorymanager.init();
//while true do begin end;
vmemorymanager.init();
vmemorymanager.new_page(0);

49
src/pmemorymanager.pas
View File

@ -29,24 +29,28 @@ var
procedure set_memory_area_present(base : uint64; length : uint64; present : boolean);
var
BlockHigh, BlockLow : uint16;
FirstBlock : uint32;
LastBlock : uint32;
i : uint32;
begin
BlockLow:= base SHR 22;
BlockHigh:= base+length SHR 22;
if not present then begin
PhysicalMemory[BlockLow].Scanned:= True;
PhysicalMemory[BlockHigh].Scanned:= True;
PhysicalMemory[BlockLow].Present:= False;
PhysicalMemory[BlockHigh].Present:= False;
end else begin
If not PhysicalMemory[BlockLow].Scanned then begin
PhysicalMemory[BlockLow].Scanned:= True;
PhysicalMemory[BlockLow].Present:= True;
end;
If not PhysicalMemory[BlockHigh].Scanned then begin
PhysicalMemory[BlockHigh].Scanned:= True;
PhysicalMemory[BlockHigh].Present:= True;
FirstBlock:= base SHR 22;
LastBlock:= (base+length) SHR 22;
console.writewordln(FirstBlock);
console.writewordln(LastBlock);
if (FirstBlock > 1023) then exit;
while LastBlock > 1023 do begin
LastBlock:= LastBlock-1;
end;
for i:=FirstBlock to LastBlock do begin
if not present then begin
PhysicalMemory[i].Scanned:= True;
PhysicalMemory[i].Present:= present;
end else begin
If not PhysicalMemory[i].Scanned then begin
PhysicalMemory[i].Scanned:= True;
PhysicalMemory[i].Present:= present;
end;
end;
end;
end;
@ -63,15 +67,20 @@ begin
length:= multibootinfo^.mmap_length;
mmap:= Pmemory_map_t(address);
for i:=0 to 1023 do begin
PhysicalMemory[i].Present:= True;
PhysicalMemory[i].Present:= False;
PhysicalMemory[i].Allocated:= False;
PhysicalMemory[i].Scanned:= False;
PhysicalMemory[i].MappedTo:= 0;
end;
while uint32(mmap) < (address + length) do begin
console.writewordln(mmap^.mtype);
console.writehexln(mmap^.base_addr);
console.writehexln(mmap^.length);
console.writehexln(mmap^.mtype);
console.writestringln('');
if mmap^.mtype <> $01 then begin
set_memory_area_present(mmap^.base_addr, mmap^.length, False);
end else begin
set_memory_area_present(mmap^.base_addr, mmap^.length, True);
end;
mmap:= Pmemory_map_t(uint32(mmap)+mmap^.size+sizeof(mmap^.size));
end;
@ -100,7 +109,7 @@ begin
walk_memory_map;
force_alloc_block(0, 0);
force_alloc_block(1, 0);
force_alloc_block(2, 0); //First 12MiB reserved for Kernel/BIOS.
alloc_block(2, 0); //First 12MiB reserved for Kernel/BIOS.
console.writestring('PMM: ');
console.writeword(nPresent);
console.writestringln('/1024 Block Available for Allocation.');
@ -116,7 +125,7 @@ begin
end else begin
PhysicalMemory[block].Allocated:= True;
PhysicalMemory[block].MappedTo:= caller;
console.writestring('4MiB Block Allocated @ ');
console.writestring('PMM: 4MiB Block Allocated @ ');
console.writeword(block);
console.writestring(' [');
console.writehex(block SHL 22);