paging.h

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 $Id: paging_8h-source.html 88 2016-01-12 00:11:29Z reddawg $

*****************************************************************************************/

#ifndef _PAGING_H
#define _PAGING_H

#include <ubixos/types.h>
#include <sys/sysproto.h>
#include <sys/thread.h>

#define VM_THRD           0
#define VM_TASK           1

#define pageLength        0x00000400
#define pageSize          4096
#define pageEntries       (pageSize/4)
#define tablesBaseAddress   0xBFC00000
#define parentPageDirAddr   0x100000

#define PAGE_COW            0x00000200
#define PAGE_STACK          0x00000400
#define PAGE_WIRED          0x00000600
#define PAGE_PRESENT        0x00000001
#define PAGE_WRITE          0x00000002
#define PAGE_USER           0x00000004
#define PAGE_DEFAULT        (PAGE_PRESENT|PAGE_WRITE|PAGE_USER)
#define KERNEL_PAGE_DEFAULT (PAGE_PRESENT|PAGE_WRITE)

#define PAGE_SHIFT      12              /* LOG2(PAGE_SIZE) */
#define PAGE_SIZE       (1<<PAGE_SHIFT) /* bytes/page */
#define PAGE_MASK       (PAGE_SIZE-1)

#define trunc_page(x)           ((x) & ~PAGE_MASK)
#define round_page(x)   (((x) + PAGE_MASK) & ~PAGE_MASK)
#define ctob(x)                 ((x)<<PAGE_SHIFT)
#define btoc(x)                 (((vm_offset_t)(x)+PAGE_MASK)>>PAGE_SHIFT)


int vmmClearVirtualPage(uInt32 pageAddr);

void vmmUnmapPage(uInt32,int);
void vmmUnmapPages(void *,uInt32);
void *vmmMapFromTask(pidType,void *,uInt32);
void *vmmCopyVirtualSpace(pidType);
void *vmmGetFreePage(pidType);
void *vmmGetFreeKernelPage(pidType pid,uInt16 count);
void *vmmCreateVirtualSpace(pidType);
void *vmmGetFreeVirtualPage(pidType,int,int);

uInt32 vmm_getPhysicalAddr(uInt32);
int    vmm_setPageAttributes(uInt32,uInt16);
int    vmm_remapPage(uInt32,uInt32,uInt16);
int    vmm_pagingInit();
void  *vmm_getFreeMallocPage(uInt16 count);
void   vmm_pageFault(uInt32,uInt32,uInt32);
void  _vmm_pageFault();
int mmap(struct thread *,struct mmap_args *);
int obreak(struct thread *,struct obreak_args *);
int munmap(struct thread *,struct munmap_args *);


extern uInt32 *kernelPageDirectory;

#endif

/***
 END
 ***/

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