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Annotation of xinu/h/mem.h, revision 1.1.1.2

1.1       root        1: /* mem.h - freestk, roundew, truncew */
                      2: 
                      3: /*----------------------------------------------------------------------
1.1.1.2 ! root        4:  * roundew, truncew - round or trunctate address to next even word
1.1       root        5:  *----------------------------------------------------------------------
                      6:  */
1.1.1.2 ! root        7: #define        roundew(x)      (WORD *)( (3 + (WORD)(x)) & ~03 )
        !             8: #define        truncew(x)      (WORD *)( ((WORD)(x)) & ~03 )
1.1       root        9: 
                     10: /*----------------------------------------------------------------------
                     11:  *  freestk  --  free stack memory allocated by getstk
                     12:  *----------------------------------------------------------------------
                     13:  */
                     14: #define freestk(p,len) freemem((unsigned)(p)                   \
                     15:                                - (unsigned)(roundew(len))      \
                     16:                                + (unsigned)sizeof(int),        \
                     17:                                roundew(len) )
                     18: 
1.1.1.2 ! root       19: struct mblock  {
        !            20:        struct  mblock  *mnext;
        !            21:        unsigned int    mlen;
        !            22:        };
1.1       root       23: extern struct  mblock  memlist;        /* head of free memory list     */
1.1.1.2 ! root       24: extern WORD    *maxaddr;               /* max memory address           */
        !            25: extern WORD    end;                    /* address beyond loaded memory */
        !            26: 

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