56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
// vmm.h
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// Author: Josh Holtrop
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// Date: 09/30/03
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// Rewritten from scratch: 12/23/03
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// Modified: 12/30/03
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#define VMM_HE_UNUSED 0 //available entry
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#define VMM_HE_FREE 1 //free section of memory
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#define VMM_HE_USED 2 //used section of memory
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#define VMM_HE_HOLE 3 //a "hole" (unmapped) section of virtual memory
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#define VMM_HE_HEB 4 //HeapEntryBlock
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#define VMM_MALLOC_GRANULARITY 4 //granularity for all memory requests
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typedef struct {
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dword base; //virtual base address
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dword size; //size in bytes
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dword attributes; //free/used/hole
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dword link; //link to next HeapEntry
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} __attribute__((packed)) HeapEntry;
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typedef struct {
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HeapEntry entry[256]; //256 HeapEntry objects = 4kb (1 page)
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} __attribute__((packed)) HeapEntryBlock;
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void vmm_init();
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void *malloc(dword bytes);
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int free(void *ptr);
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void vmm_map1(dword virt, dword physical);
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void vmm_mapn(dword virt, dword physical, dword n);
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void vmm_unmap1(dword virt);
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void vmm_unmapn(dword virt, dword n);
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void vmm_heb_init(HeapEntryBlock *heb);
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void *vmm_getFreeChunk(dword bytes);
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HeapEntry *vmm_nextHeapEntry();
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dword vmm_heapEntriesLeft();
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HeapEntry *vmm_getLastHeapEntry();
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HeapEntry *vmm_getFirstUnusedHeapEntry();
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HeapEntry *vmm_getFirstHoleHeapEntry(dword minBytes);
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void vmm_addHeapEntryBlock();
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int vmm_moreCore(dword bytes);
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void vmm_coalesceHeapEntry(HeapEntry *he);
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HeapEntry *vmm_getHeapEntryByBase(dword base);
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HeapEntry *firstHeapEntry = (HeapEntry *)0xD0000000; //this is where heap memory starts
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