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, 07/13/04
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// Modified: 08/28/04
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#ifndef __HOS_VMM__
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#define __HOS_VMM__ __HOS_VMM__
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#include "hos_defines.h"
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#include "multiboot.h"
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#define VMM_HE_TYPES 4 //4 types of heap entries
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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/wilderness) section of virtual memory
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#define VMM_MALLOC_GRANULARITY 4 //a power of 2, granularity for all memory requests
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#define VMM_MALLOC_GRAN_MASK VMM_MALLOC_GRANULARITY-1 //mask for determining how much of a request is past granularity
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typedef struct {
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void *base; //virtual base address
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u32_t length; //size in bytes
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void *next; //link to next HeapEntry
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void *prev; //link to previous HeapEntry
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} __attribute__((packed)) HeapEntry_t;
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typedef struct {
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HeapEntry_t entry[256]; //256 HeapEntry objects = 4kb (1 page)
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} __attribute__((packed)) HeapEntryBlock_t;
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typedef struct {
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int count;
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HeapEntry_t *head;
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} HeapEntryQueue_t;
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void vmm_init();
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void *kmalloc(u32_t size);
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int kfree(void *addr);
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void *vmm_palloc();
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int vmm_pfree(void *addr);
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void *kcalloc(unsigned int number, unsigned int size);
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int vmm_map(void *virt);
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int vmm_map1(unsigned int virt, unsigned int physical);
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int vmm_mapn(unsigned int virt, unsigned int physical, unsigned int n);
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void vmm_unmap1(unsigned int virt);
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void vmm_unmapn(unsigned int virt, unsigned int n);
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#endif
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