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Annotation of 41BSD/sys/h/vmmac.h, revision 1.1.1.1

1.1       root        1: /*     vmmac.h 4.1     11/9/80 */
                      2: 
                      3: /*
                      4:  * Virtual memory related conversion macros
                      5:  */
                      6: 
                      7: /* Core clicks to number of pages of page tables needed to map that much */
                      8: #define        ctopt(x)        (((x)+NPTEPG-1)/NPTEPG)
                      9: 
                     10: /* Virtual page numbers to text|data|stack segment page numbers and back */
                     11: #define        vtotp(p, v)     ((int)(v))
                     12: #define        vtodp(p, v)     ((int)((v) - (p)->p_tsize))
                     13: #define        vtosp(p, v)     ((int)(btop(USRSTACK) - 1 - (v)))
                     14: #define        tptov(p, i)     ((unsigned)(i))
                     15: #define        dptov(p, i)     ((unsigned)((p)->p_tsize + (i)))
                     16: #define        sptov(p, i)     ((unsigned)(btop(USRSTACK) - 1 - (i)))
                     17: 
                     18: /* Tell whether virtual page numbers are in text|data|stack segment */
                     19: #define        isassv(p, v)    ((v) & P1TOP)
                     20: #define        isatsv(p, v)    ((v) < (p)->p_tsize)
                     21: #define        isadsv(p, v)    ((v) >= (p)->p_tsize && !isassv(p, v))
                     22: 
                     23: /* Tell whether pte's are text|data|stack */
                     24: #define        isaspte(p, pte)         ((pte) > sptopte(p, (p)->p_ssize))
                     25: #define        isatpte(p, pte)         ((pte) < dptopte(p, 0))
                     26: #define        isadpte(p, pte)         (!isaspte(p, pte) && !isatpte(p, pte))
                     27: 
                     28: /* Text|data|stack pte's to segment page numbers and back */
                     29: #define        ptetotp(p, pte)         ((pte) - (p)->p_p0br)
                     30: #define        ptetodp(p, pte)         ((pte) - ((p)->p_p0br + (p)->p_tsize))
                     31: #define        ptetosp(p, pte) \
                     32:        (((p)->p_p0br + (p)->p_szpt*NPTEPG - UPAGES - 1) - (pte))
                     33: 
                     34: #define        tptopte(p, i)           ((p)->p_p0br + (i))
                     35: #define        dptopte(p, i)           ((p)->p_p0br + (p)->p_tsize + (i))
                     36: #define        sptopte(p, i) \
                     37:        (((p)->p_p0br + (p)->p_szpt*NPTEPG - UPAGES - 1) - (i))
                     38: 
                     39: /* Bytes to pages without rounding, and back */
                     40: #define        btop(x)         (((unsigned)(x)) >> PGSHIFT)
                     41: #define        ptob(x)         ((caddr_t)((x) << PGSHIFT))
                     42: 
                     43: /* Turn virtual addresses into kernel map indices */
                     44: #define        kmxtob(a)       (usrpt + (a) * NPTEPG)
                     45: #define        btokmx(b)       (((b) - usrpt) / NPTEPG)
                     46: 
                     47: /* User area address and pcb bases */
                     48: #define        uaddr(p)        (&((p)->p_p0br[(p)->p_szpt * NPTEPG - UPAGES]))
                     49: #define        pcbb(p)         ((p)->p_addr[0].pg_pfnum)
                     50: 
                     51: /* Average new into old with aging factor time */
                     52: #define        ave(smooth, cnt, time) \
                     53:        smooth = ((time - 1) * (smooth) + (cnt)) / (time)

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