machparm.h

来自「Ibmstb02500 miniboot 源码」· C头文件 代码 · 共 66 行

/* openbios/include/machine/machparm.h, redbios, redbios_iii_1.0 3/23/98 11:41:33 */
/*-----------------------------------------------------------------------------+
|
|       This source code has been made available to you by IBM on an AS-IS
|       basis.  Anyone receiving this source is licensed under IBM
|       copyrights to use it in any way he or she deems fit, including
|       copying it, modifying it, compiling it, and redistributing it either
|       with or without modifications.  No license under IBM patents or
|       patent applications is to be implied by the copyright license.
|
|       Any user of this software should understand that IBM cannot provide
|       technical support for this software and will not be responsible for
|       any consequences resulting from the use of this software.
|
|       Any person who transfers this source code or any derivative work
|       must include the IBM copyright notice, this paragraph, and the
|       preceding two paragraphs in the transferred software.
|
|       COPYRIGHT   I B M   CORPORATION 1995
|       LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M
+-----------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------+
|
|  File Name:   machparm.h
|
|  Function:    Machine dependent defines and parameters.  This is general
|               enough to be included in this directory structure.
|
|  Author:      Maciej Tyrlik.
|
|  Change Activity-
|
|  Date        Description of Change                                       BY
|  ---------   ---------------------                                       ---
|  18-Nov-92   Created                                                     MPT
|  26-May-94   1.00 first version after code review                        MPT
|
+-----------------------------------------------------------------------------*/

#ifndef _machparam_machparm_h_
#define _machparam_machparm_h_

#include <limits.h>

/*-----------------------------------------------------------------------------+
| Size of MBUF.  And associated defines.  CLSIZE is the number of pages to a
| cluster in a software page (page table entry), and CLBYTES is the number
| of bytes.
+-----------------------------------------------------------------------------*/
#define MSIZE           128
#define NBPG            PAGESIZE
#define CLSIZE          1
#define CLBYTES         (CLSIZE*NBPG)
#define MCLBYTES        CLBYTES
#define MCLOFSET        (MCLBYTES-1)

/*-----------------------------------------------------------------------------+
| Number of bits in a page and cluster.
+-----------------------------------------------------------------------------*/
#define PGSHIFT         12
#define MCLSHIFT        12
#define CLSIZELOG2      0
#define CLSHIFT         (PGSHIFT+CLSIZELOG2)

#endif /* _machparam_machparm_h_ */