Tiberiu Chibici
852cf1bb17
==================================================== Mainly changed: FS.Initrd + (kind of) refractored VFS, bugfixed + Rewrote 'initrd' file system, fixed many problems + Working 'cat' and 'dir' console commands + Wrote 'initrd' image write application (for windows), however it may be bugged
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
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* memory-add.h
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*
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* Created on: Aug 27, 2011
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* Author: Tiberiu
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*/
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#ifndef MEMORY_ADD_H_
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#define MEMORY_ADD_H_
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#include <memory.h>
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#include <stdlib.h>
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#include <debugio.h>
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#include <array.h>
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/***************************************************
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* Paging *
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***************************************************/
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typedef uint32 Page;
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enum PageFlags
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{
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PagePresent = 0x1,
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PageWriteable = 0x2,
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PageUser = 0x4,
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PageWriteThough = 0x8,
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PageNotCacheable = 0x10,
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PageAccessed = 0x20,
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PageDirty = 0x40,
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PagePAT = 0x80,
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PageCpuGlobal = 0x100,
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PageLvl4Global = 0x200,
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PageFrame = 0xFFFFF000
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};
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typedef struct {
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Page Pages[1024];
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} PageTable;
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typedef struct {
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PageTable* Tables[1024];
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uint32 TablesPhysical[1024];
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uint32 PhysicalAddr;
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} PageDirectory;
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extern PageDirectory* CurrentDirectory;
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extern PageDirectory* KernelDirectory;
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extern void PagingInitialize(uint32 SystemMemory);
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extern void PagingSwitchPageDirectory (PageDirectory* dir);
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extern Page* PagingGetPage(uint32 addr, uint8 make, PageDirectory* dir);
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/***************************************************
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* Physical memory manager *
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***************************************************/
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extern uint32 TotalFrames;
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extern uint32 TotalMemory;
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extern uint32 UsedFrames;
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void MemPhInitialize(uint32 SystemMemoryKb);
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extern void MemPhSetFrame (uint32 frame, uint8 value);
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uint32 MemPhGetFrame (uint32 frame);
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uint32 MemPhFindFreeFrame();
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void MemPhAllocFrame(Page* page, uint8 isKernel, uint8 isWriteable);
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void MemPhFreeFrame(Page* page);
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void MemPhReserveFrames (uint32 address, uint32 length);
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/***************************************************
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* Memory heap *
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***************************************************/
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typedef struct
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{
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OrderedArray Index;
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uint32 StartAddress, EndAddress, MaxAddress;
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// bit 0: supervisor-only bit 1: read-only
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uint8 Flags;
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} MemHeap;
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extern MemHeap* KernelHeap;
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extern uint32 MemHeapFindSmallestHole (uint32 size, uint8 page_align, MemHeap* heap);
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extern int32 MemHeapCompare (uint32 a, uint32 b);
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extern MemHeap* MemHeapCreate(uint32 start, uint32 end, uint32 max, uint8 flags);
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extern void MemHeapExpand(uint32 newsz, MemHeap* heap, PageDirectory* pd);
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extern uint32 MemHeapContract(uint32 newsz, MemHeap* heap, PageDirectory* pd);
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extern uint32 MemHeapAlloc (uint32 size, uint8 isPageAligned, MemHeap* heap, PageDirectory* pd);
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extern void MemHeapFree (uint32 address, MemHeap* heap, PageDirectory* pd);
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#endif /* MEMORY_ADD_H_ */
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