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Annotation of xinu/h/mem.h, revision 1.1.1.1

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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