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/*

/*

 * common.h -- common definitions

 * common.h -- common definitions

 */

 */

#ifndef _COMMON_H_

#ifndef _COMMON_H_

#define _COMMON_H_

#define _COMMON_H_

#define PAGE_SHIFT      12                      /* log2 of page size */

#define PAGE_SHIFT      12                      /* log2 of page size */

#define PAGE_SIZE       (1 << PAGE_SHIFT)       /* page size in bytes */

#define PAGE_SIZE       (1 << PAGE_SHIFT)       /* page size in bytes */

#define OFFSET_MASK     (PAGE_SIZE - 1)         /* mask for offset in page */

#define OFFSET_MASK     (PAGE_SIZE - 1)         /* mask for offset in page */

#define PAGE_MASK       (~OFFSET_MASK)          /* mask for page number */

#define PAGE_MASK       (~OFFSET_MASK)          /* mask for page number */

typedef enum { false, true } Bool;              /* truth values */

typedef enum { false, true } Bool;              /* truth values */

typedef unsigned int Word;                      /* 32 bit quantities */

typedef unsigned int Word;                      /* 32 bit quantities */

typedef unsigned short Half;                    /* 16 bit quantities */

typedef unsigned short Half;                    /* 16 bit quantities */

typedef unsigned char Byte;                     /*  8 bit quantities */

typedef unsigned char Byte;                     /*  8 bit quantities */

#define NULL    ((void *) 0)

#define NULL    ((void *) 0)

#endif /* _COMMON_H_ */

#endif /* _COMMON_H_ */