xversion.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/******************************************************************************
*
*     Author: Xilinx, Inc.
*
*
*     This program is free software; you can redistribute it and/or modify it
*     under the terms of the GNU General Public License as published by the
*     Free Software Foundation; either version 2 of the License, or (at your
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*
*
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*
*
*     Xilinx hardware products are not intended for use in life support
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*     expressly prohibited.
*
*
*     (c) Copyright 2002-2004 Xilinx Inc.
*     All rights reserved.
*
*
*     You should have received a copy of the GNU General Public License along
*     with this program; if not, write to the Free Software Foundation, Inc.,
*     675 Mass Ave, Cambridge, MA 02139, USA.
*
******************************************************************************/
/*****************************************************************************
*
* This file contains the implementation of the XVersion component. This
* component represents a version ID.  It is encapsulated within a component
* so that it's type and implementation can change without affecting users of
* it.
*
* The version is formatted as X.YYZ where X = 0 - 9, Y = 00 - 99, Z = a - z
* X is the major revision, YY is the minor revision, and Z is the
* compatability revision.
*
* Packed versions are also utilized for the configuration ROM such that
* memory is minimized. A packed version consumes only 16 bits and is
* formatted as follows.
*
* <pre>
* Revision                  Range       Bit Positions
*
* Major Revision            0 - 9       Bits 15 - 12
* Minor Revision            0 - 99      Bits 11 - 5
* Compatability Revision    a - z       Bits 4 - 0
</pre>
*
******************************************************************************/

/***************************** Include Files *********************************/

#include "xbasic_types.h"
#include "xversion.h"

/************************** Constant Definitions *****************************/

/* the following constants define the masks and shift values to allow the
 * revisions to be packed and unpacked, a packed version is packed into a 16
 * bit value in the following format, XXXXYYYYYYYZZZZZ, where XXXX is the
 * major revision, YYYYYYY is the minor revision, and ZZZZZ is the compatability
 * revision
 */
#define XVE_MAJOR_SHIFT_VALUE       12
#define XVE_MINOR_ONLY_MASK         0x0FE0
#define XVE_MINOR_SHIFT_VALUE       5
#define XVE_COMP_ONLY_MASK          0x001F

/* the following constants define the specific characters of a version string
 * for each character of the revision, a version string is in the following
 * format, "X.YYZ" where X is the major revision (0 - 9), YY is the minor
 * revision (00 - 99), and Z is the compatability revision (a - z)
 */
#define XVE_MAJOR_CHAR      0	/* major revision 0 - 9 */
#define XVE_MINOR_TENS_CHAR 2	/* minor revision tens 0 - 9 */
#define XVE_MINOR_ONES_CHAR 3	/* minor revision ones 0 - 9 */
#define XVE_COMP_CHAR       4	/* compatability revision a - z */
#define XVE_END_STRING_CHAR 5

/**************************** Type Definitions *******************************/

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/

static u32 IsVersionStringValid(s8 * StringPtr);

/*****************************************************************************
*
* Unpacks a packed version into the specified version. Versions are packed
* into the configuration ROM to reduce the amount storage. A packed version
* is a binary format as oppossed to a non-packed version which is implemented
* as a string.
*
* @param    InstancePtr points to the version to unpack the packed version into.
* @param    PackedVersion contains the packed version to unpack.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void
XVersion_UnPack(XVersion * InstancePtr, u16 PackedVersion)
{
	/* not implemented yet since CROM related */
}

/*****************************************************************************
*
* Packs a version into the specified packed version. Versions are packed into
* the configuration ROM to reduce the amount storage.
*
* @param    InstancePtr points to the version to pack.
* @param    PackedVersionPtr points to the packed version which will receive
*           the new packed version.
*
* @return
*
* A status, XST_SUCCESS, indicating the packing was accomplished
* successfully, or an error, XST_INVALID_VERSION, indicating the specified
* input version was not valid such that the pack did not occur
* <br><br>
* The packed version pointed to by PackedVersionPtr is modified with the new
* packed version if the status indicates success.
*
* @note
*
* None.
*
******************************************************************************/
XStatus
XVersion_Pack(XVersion * InstancePtr, u16 * PackedVersionPtr)
{
	/* not implemented yet since CROM related */

	return XST_SUCCESS;
}

/*****************************************************************************
*
* Determines if two versions are equal.
*
* @param    InstancePtr points to the first version to be compared.
* @param    VersionPtr points to a second version to be compared.
*
* @return
*
* TRUE if the versions are equal, FALSE otherwise.
*
* @note
*
* None.
*
******************************************************************************/
u32
XVersion_IsEqual(XVersion * InstancePtr, XVersion * VersionPtr)
{
	u8 *Version1 = (u8 *) InstancePtr;
	u8 *Version2 = (u8 *) VersionPtr;
	int Index;

	/* assert to verify input arguments */

	XASSERT_NONVOID(InstancePtr != NULL);
	XASSERT_NONVOID(VersionPtr != NULL);

	/* check each byte of the versions to see if they are the same,
	 * return at any point a byte differs between them
	 */
	for (Index = 0; Index < sizeof (XVersion); Index++) {
		if (Version1[Index] != Version2[Index]) {
			return FALSE;
		}
	}

	/* No byte was found to be different between the versions, so indicate
	 * the versions are equal
	 */
	return TRUE;
}

/*****************************************************************************
*
* Converts a version to a null terminated string.
*
* @param    InstancePtr points to the version to convert.
* @param    StringPtr points to the string which will be the result of the
*           conversion. This does not need to point to a null terminated
*           string as an input, but must point to storage which is an adequate
*           amount to hold the result string.
*
* @return
*
* The null terminated string is inserted at the location pointed to by
* StringPtr if the status indicates success.
*
* @note
*
* It is necessary for the caller to have already allocated the storage to
* contain the string.  The amount of memory necessary for the string is
* specified in the version header file.
*
******************************************************************************/
void
XVersion_ToString(XVersion * InstancePtr, s8 * StringPtr)
{
	/* assert to verify input arguments */

	XASSERT_VOID(InstancePtr != NULL);
	XASSERT_VOID(StringPtr != NULL);

	/* since version is implemented as a string, just copy the specified
	 * input into the specified output
	 */
	XVersion_Copy(InstancePtr, (XVersion *) StringPtr);
}

/*****************************************************************************
*
* Initializes a version from a null terminated string. Since the string may not
* be a format which is compatible with the version, an error could occur.
*
* @param    InstancePtr points to the version which is to be initialized.
* @param    StringPtr points to a null terminated string which will be
*           converted to a version.  The format of the string must match the
*           version string format which is X.YYX where X = 0 - 9, YY = 00 - 99,
*           Z = a - z.
*
* @return
*
* A status, XST_SUCCESS, indicating the conversion was accomplished
* successfully, or XST_INVALID_VERSION indicating the version string format
* was not valid.
*
* @note
*
* None.
*
******************************************************************************/
XStatus
XVersion_FromString(XVersion * InstancePtr, s8 * StringPtr)
{
	/* assert to verify input arguments */

	XASSERT_NONVOID(InstancePtr != NULL);
	XASSERT_NONVOID(StringPtr != NULL);

	/* if the version string specified is not valid, return an error */

	if (!IsVersionStringValid(StringPtr)) {
		return XST_INVALID_VERSION;
	}

	/* copy the specified string into the specified version and indicate the
	 * conversion was successful
	 */
	XVersion_Copy((XVersion *) StringPtr, InstancePtr);

	return XST_SUCCESS;
}

/*****************************************************************************
*
* Copies the contents of a version to another version.
*
* @param    InstancePtr points to the version which is the source of data for
*           the copy operation.
* @param    VersionPtr points to another version which is the destination of
*           the copy operation.
*
* @return
*
* None.
*
* @note
*
* None.
*
******************************************************************************/
void
XVersion_Copy(XVersion * InstancePtr, XVersion * VersionPtr)
{
	u8 *Source = (u8 *) InstancePtr;
	u8 *Destination = (u8 *) VersionPtr;
	int Index;

	/* assert to verify input arguments */

	XASSERT_VOID(InstancePtr != NULL);
	XASSERT_VOID(VersionPtr != NULL);

	/* copy each byte of the source version to the destination version */

	for (Index = 0; Index < sizeof (XVersion); Index++) {
		Destination[Index] = Source[Index];
	}
}

/*****************************************************************************
*
* Determines if the specified version is valid.
*
* @param    StringPtr points to the string to be validated.
*
* @return
*
* TRUE if the version string is a valid format, FALSE otherwise.
*
* @note
*
* None.
*
******************************************************************************/
static u32
IsVersionStringValid(s8 * StringPtr)
{
	/* if the input string is not a valid format, "X.YYZ" where X = 0 - 9,
	 * YY = 00 - 99, and Z = a - z, then indicate it's not valid
	 */
	if ((StringPtr[XVE_MAJOR_CHAR] < '0') ||
	    (StringPtr[XVE_MAJOR_CHAR] > '9') ||
	    (StringPtr[XVE_MINOR_TENS_CHAR] < '0') ||
	    (StringPtr[XVE_MINOR_TENS_CHAR] > '9') ||
	    (StringPtr[XVE_MINOR_ONES_CHAR] < '0') ||
	    (StringPtr[XVE_MINOR_ONES_CHAR] > '9') ||
	    (StringPtr[XVE_COMP_CHAR] < 'a') ||
	    (StringPtr[XVE_COMP_CHAR] > 'z')) {
		return FALSE;
	}

	return TRUE;
}