LXR linux/arch/ia64/include/uapi/asm/rse.h

   1#ifndef _ASM_IA64_RSE_H
   2#define _ASM_IA64_RSE_H
   3
   4/*
   5 * Copyright (C) 1998, 1999 Hewlett-Packard Co
   6 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
   7 *
   8 * Register stack engine related helper functions.  This file may be
   9 * used in applications, so be careful about the name-space and give
  10 * some consideration to non-GNU C compilers (though __inline__ is
  11 * fine).
  12 */
  13
  14static __inline__ unsigned long
  15ia64_rse_slot_num (unsigned long *addr)
  16{
  17        return (((unsigned long) addr) >> 3) & 0x3f;
  18}
  19
  20/*
  21 * Return TRUE if ADDR is the address of an RNAT slot.
  22 */
  23static __inline__ unsigned long
  24ia64_rse_is_rnat_slot (unsigned long *addr)
  25{
  26        return ia64_rse_slot_num(addr) == 0x3f;
  27}
  28
  29/*
  30 * Returns the address of the RNAT slot that covers the slot at
  31 * address SLOT_ADDR.
  32 */
  33static __inline__ unsigned long *
  34ia64_rse_rnat_addr (unsigned long *slot_addr)
  35{
  36        return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
  37}
  38
  39/*
  40 * Calculate the number of registers in the dirty partition starting at BSPSTORE and
  41 * ending at BSP.  This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores
  42 * ar.rnat.
  43 */
  44static __inline__ unsigned long
  45ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
  46{
  47        unsigned long slots = (bsp - bspstore);
  48
  49        return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
  50}
  51
  52/*
  53 * The inverse of the above: given bspstore and the number of
  54 * registers, calculate ar.bsp.
  55 */
  56static __inline__ unsigned long *
  57ia64_rse_skip_regs (unsigned long *addr, long num_regs)
  58{
  59        long delta = ia64_rse_slot_num(addr) + num_regs;
  60
  61        if (num_regs < 0)
  62                delta -= 0x3e;
  63        return addr + num_regs + delta/0x3f;
  64}
  65
  66#endif /* _ASM_IA64_RSE_H */
  67