usr/src/sys/h/vmmac.h

/*      vmmac.h 4.1     11/9/80 */

/*
 * Virtual memory related conversion macros
 */

/* Core clicks to number of pages of page tables needed to map that much */
#define ctopt(x)        (((x)+NPTEPG-1)/NPTEPG)

/* Virtual page numbers to text|data|stack segment page numbers and back */
#define vtotp(p, v)     ((int)(v))
#define vtodp(p, v)     ((int)((v) - (p)->p_tsize))
#define vtosp(p, v)     ((int)(btop(USRSTACK) - 1 - (v)))
#define tptov(p, i)     ((unsigned)(i))
#define dptov(p, i)     ((unsigned)((p)->p_tsize + (i)))
#define sptov(p, i)     ((unsigned)(btop(USRSTACK) - 1 - (i)))

/* Tell whether virtual page numbers are in text|data|stack segment */
#define isassv(p, v)    ((v) & P1TOP)
#define isatsv(p, v)    ((v) < (p)->p_tsize)
#define isadsv(p, v)    ((v) >= (p)->p_tsize && !isassv(p, v))

/* Tell whether pte's are text|data|stack */
#define isaspte(p, pte)         ((pte) > sptopte(p, (p)->p_ssize))
#define isatpte(p, pte)         ((pte) < dptopte(p, 0))
#define isadpte(p, pte)         (!isaspte(p, pte) && !isatpte(p, pte))

/* Text|data|stack pte's to segment page numbers and back */
#define ptetotp(p, pte)         ((pte) - (p)->p_p0br)
#define ptetodp(p, pte)         ((pte) - ((p)->p_p0br + (p)->p_tsize))
#define ptetosp(p, pte) \
        (((p)->p_p0br + (p)->p_szpt*NPTEPG - UPAGES - 1) - (pte))

#define tptopte(p, i)           ((p)->p_p0br + (i))
#define dptopte(p, i)           ((p)->p_p0br + (p)->p_tsize + (i))
#define sptopte(p, i) \
        (((p)->p_p0br + (p)->p_szpt*NPTEPG - UPAGES - 1) - (i))

/* Bytes to pages without rounding, and back */
#define btop(x)         (((unsigned)(x)) >> PGSHIFT)
#define ptob(x)         ((caddr_t)((x) << PGSHIFT))

/* Turn virtual addresses into kernel map indices */
#define kmxtob(a)       (usrpt + (a) * NPTEPG)
#define btokmx(b)       (((b) - usrpt) / NPTEPG)

/* User area address and pcb bases */
#define uaddr(p)        (&((p)->p_p0br[(p)->p_szpt * NPTEPG - UPAGES]))
#define pcbb(p)         ((p)->p_addr[0].pg_pfnum)

/* Average new into old with aging factor time */
#define ave(smooth, cnt, time) \
        smooth = ((time - 1) * (smooth) + (cnt)) / (time)