vmbasearch36lib.c

VxWorks BSP框架源代码包含头文件和驱动

/* vmBaseArch36Lib.c - VM (bundled) library for PentiumPro/2/3/4 36 bit mode */

/* Copyright 2002 Wind River Systems, Inc. */
#include "copyright_wrs.h"

/*
modification history
--------------------
01b,10oct02,hdn  updated the documentation. (spr 82229)
01a,12jun02,hdn  written
*/

/*
DESCRIPTION:
The 36 bit physical addressing mechanism of P6 (Pentium II and III) family
processors and P7 (Pentium4) family processors are supported by this library.
This library provides the virtual memory mapping and virtual address
translation that works with the bundled VM library.  The architecture
specific VM library APIs are linked in automatically when INCLUDE_MMU_BASIC 
and INCLUDE_MMU_P6_36BIT are both defined in the BSP.  The provided APIs are 
vmBaseArch36Map() and vmBaseArch36Translate().

The 4KB-page and 2MB-page are supported.  The page size is configurable by 
VM_PAGE_SIZE macro in the BSP.  

The memory description table sysPhysMemDesc[] in sysLib.c has not changed
and only allows 32 bit virtual and physical address mapping description.
Thus the first 4GB 32 bit address space of the 36 bit physical address is used
at the initialization/boot time.  Then, the physical address beyond the 4GB 
can be mapped in somewhere outside of the system memory pool in the 32 bit
virtual address space with above APIs.

INCLUDE FILES: mmuPro36Lib.h

SEE ALSO: vmLib, Intel Architecture Software Developer's Manual

*/


/* includes */

#include "vxWorks.h"
#include "errno.h"
#include "mmuLib.h"
#include "private/vmLibP.h"
#include "arch/i86/mmuPro36Lib.h"


/* imports */

IMPORT VM_CONTEXT *	currentContext;		/* vmBaseLib.c */


/* defines */

#define NOT_PAGE_ALIGNED(addr)  (((UINT)(addr)) & ((UINT)pageSize - 1))
#define MMU_PAGE_MAP		(mmuPro36PageMap)
#define MMU_TRANSLATE		(mmuPro36Translate)


/****************************************************************************
*
* vmBaseArch36LibInit - initialize the arch specific bundled VM library
*
* This routine links the arch specific bundled VM library into the VxWorks 
* system.  It is called automatically when \%INCLUDE_MMU_BASIC and 
* \%INCLUDE_MMU_P6_36BIT are both defined in the BSP.
*
* RETURNS: N/A
*/

void vmBaseArch36LibInit (void)
    {
    } 

/****************************************************************************
*
* vmBaseArch36Map - map 36bit physical to the 32bit virtual memory
*
* vmBaseArch36Map maps 36bit physical pages into a contiguous block of 32bit
* virtual memory.  <virtAddr> and <physAddr> must be on page boundaries,
* and <len> must be evenly divisible by the page size.  After the mapping
* the specified state is set to all pages in the newly mapped virtual memory.
* 
* This routine should not be called from interrupt level.
* 
* RETURNS: OK, or ERROR if <virtAddr> or <physAddr> are not on page
* boundaries, <len> is not a multiple of the page size, the validation fails,
* or the mapping fails.
* 
* ERRNO:
* S_vmLib_NOT_PAGE_ALIGNED
* 
*/

STATUS vmBaseArch36Map 
    (
    void * virtAddr, 		/* 32bit virtual address */
    LL_INT physAddr, 		/* 36bit physical address */
    UINT32 stateMask,		/* state mask */
    UINT32 state,		/* state */
    UINT32 len			/* length */
    )
    {
    INT32 pageSize      = vmBasePageSizeGet ();
    INT8 * thisVirtPage = (INT8 *) virtAddr;
    LL_INT thisPhysPage = physAddr;
    FAST UINT32 numBytesProcessed = 0;
    STATUS retVal       = OK;

    if (!vmLibInfo.vmBaseLibInstalled)
	return (ERROR);

    if ((NOT_PAGE_ALIGNED (thisVirtPage)) ||
        (NOT_PAGE_ALIGNED (thisPhysPage)) ||
        (NOT_PAGE_ALIGNED (len)))
	{
	errno = S_vmLib_NOT_PAGE_ALIGNED;
        return (ERROR); 
	}

    semTake (&currentContext->sem, WAIT_FOREVER);

    while (numBytesProcessed < len)
	{
	if (MMU_PAGE_MAP (currentContext->mmuTransTbl,
			  thisVirtPage, thisPhysPage) != OK)
	    {
	    retVal = ERROR;
	    break;
	    }

	if (vmBaseStateSet (currentContext, thisVirtPage,
			    pageSize, stateMask, state) != OK)
	    {
	    retVal = ERROR;
	    break;
	    }

	thisVirtPage += pageSize;
	thisPhysPage += pageSize;
	numBytesProcessed += pageSize;
	}

    semGive (&currentContext->sem);

    return (retVal);
    }

/****************************************************************************
*
* vmBaseArch36Translate - translate a 32bit virtual address to a 36bit physical address
*
* vmBaseArch36Translate retrieves mapping information for a 32bit virtual 
* address from the page translation tables.  If the specified virtual 
* address has never been mapped, the returned status is ERROR.
* 
* This routine is callable from interrupt level.
* 
* RETURNS: OK, or ERROR if validation or translation fails.
*/

STATUS vmBaseArch36Translate 
    (
    void *  virtAddr, 		/* 32bit virtual address */
    LL_INT * physAddr		/* place to put 36bit result */
    )
    {
    STATUS retVal;

    if (!vmLibInfo.vmBaseLibInstalled)
	return (ERROR);

    retVal = MMU_TRANSLATE (currentContext->mmuTransTbl, virtAddr, physAddr);

    return (retVal);
    }