vmware-svga/lib/refdriver/gmr.h

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/*
 * gmr.h --
 *
 *      Utilities for creating and Guest Memory Regions (GMRs)
 */

#ifndef __GMR_H__
#define __GMR_H__

#include "svga_reg.h"

/*
 * Macros for physical memory pages, in our flat memory model.
 * Physical Page Numbers (PPNs) are identity-mapped to virtual
 * addresses in Metalkit.
 */

#define PAGE_SIZE          4096
#define PAGE_SHIFT         12
#define PAGE_MASK          (PAGE_SIZE - 1)
#define PPN_POINTER(ppn)   ((void*)((ppn)*PAGE_SIZE))
typedef uint32 PPN;


/*
 * Global GMR state, read in by GMR_Init.
 */

typedef struct GMRState {
   uint32 maxIds;
   uint32 maxDescriptorLen;
   uint32 maxPages;
} GMRState;

extern GMRState gGMR;


/*
 * Trivial memory heap, used as system memory backings for GMRs. We
 * never actually free any memory, we just allocate starting from the
 * top of the binary image and we grow upward until we hit physical
 * memory which isn't present.
 */

void Heap_Reset(void);
void *Heap_Alloc(uint32 bytes);
PPN Heap_AllocPages(uint32 numPages);
void Heap_Discard(void *data, uint32 bytes);
void Heap_DiscardPages(PPN firstPage, uint32 numPages);


/*
 * Read GMR capabilities into gGMR, and Panic if GMRs are not
 * supported.
 */

void GMR_Init(void);
void GMR2_Init(void);


/*
 * Creating GMR descriptors.
 */

PPN GMR_AllocDescriptor(SVGAGuestMemDescriptor *descArray,
                        uint32 numDescriptors);


/*
 * Creating/destroying GMRs
 */

void GMR_Define(uint32 gmrId,
                SVGAGuestMemDescriptor *descArray,
                uint32 numDescriptors);
PPN GMR_DefineContiguous(uint32 gmrId, uint32 numPages);
PPN GMR_DefineEvenPages(uint32 gmrId, uint32 numPages);
void GMR_FreeAll(void);


#endif /* __GMR_H__ */