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Annotation of xinu/h/mem.h, revision 1.1

1.1     ! root        1: /* mem.h - freestk, roundew, truncew */
        !             2: 
        !             3: #define PAGESIZE       512
        !             4: 
        !             5: struct mblock  {
        !             6:        struct  mblock  *mnext;
        !             7:        unsigned int    mlen;
        !             8:        };
        !             9: 
        !            10: /*----------------------------------------------------------------------
        !            11:  * roundew, truncew - round or truncate address to next sizeof(mblock)
        !            12:  *----------------------------------------------------------------------
        !            13:  */
        !            14: #define        roundew(x)      (int *)( ((sizeof(struct mblock)-1) + (int)(x)) \
        !            15:                                        & (~(sizeof(struct mblock)-1)) )
        !            16: 
        !            17: #define        truncew(x)      (int *)( ((int)(x)) & (~(sizeof(struct mblock)-1)) )
        !            18: 
        !            19: /*----------------------------------------------------------------------
        !            20:  *  freestk  --  free stack memory allocated by getstk
        !            21:  *----------------------------------------------------------------------
        !            22:  */
        !            23: #define freestk(p,len) freemem((unsigned)(p)                   \
        !            24:                                - (unsigned)(roundew(len))      \
        !            25:                                + (unsigned)sizeof(int),        \
        !            26:                                roundew(len) )
        !            27: 
        !            28: extern struct  mblock  memlist;        /* head of free memory list     */
        !            29: extern int     *maxaddr;               /* max memory address           */
        !            30: extern int     end;                    /* address beyond loaded memory */
        !            31: extern int     etext;                  /* address beyond text segment  */
        !            32: extern int     edata;                  /* address beyond data segment  */
        !            33: extern int     end;                    /* address beyond loaded memory */

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