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

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2#ifndef _ASM_IA64_RSE_H
   3#define _ASM_IA64_RSE_H
   4
   5/*
   6 * Copyright (C) 1998, 1999 Hewlett-Packard Co
   7 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
   8 *
   9 * Register stack engine related helper functions.  This file may be
  10 * used in applications, so be careful about the name-space and give
  11 * some consideration to non-GNU C compilers (though __inline__ is
  12 * fine).
  13 */
  14
  15static __inline__ unsigned long
  16ia64_rse_slot_num (unsigned long *addr)
  17{
  18        return (((unsigned long) addr) >> 3) & 0x3f;
  19}
  20
  21/*
  22 * Return TRUE if ADDR is the address of an RNAT slot.
  23 */
  24static __inline__ unsigned long
  25ia64_rse_is_rnat_slot (unsigned long *addr)
  26{
  27        return ia64_rse_slot_num(addr) == 0x3f;
  28}
  29
  30/*
  31 * Returns the address of the RNAT slot that covers the slot at
  32 * address SLOT_ADDR.
  33 */
  34static __inline__ unsigned long *
  35ia64_rse_rnat_addr (unsigned long *slot_addr)
  36{
  37        return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
  38}
  39
  40/*
  41 * Calculate the number of registers in the dirty partition starting at BSPSTORE and
  42 * ending at BSP.  This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores
  43 * ar.rnat.
  44 */
  45static __inline__ unsigned long
  46ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
  47{
  48        unsigned long slots = (bsp - bspstore);
  49
  50        return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
  51}
  52
  53/*
  54 * The inverse of the above: given bspstore and the number of
  55 * registers, calculate ar.bsp.
  56 */
  57static __inline__ unsigned long *
  58ia64_rse_skip_regs (unsigned long *addr, long num_regs)
  59{
  60        long delta = ia64_rse_slot_num(addr) + num_regs;
  61
  62        if (num_regs < 0)
  63                delta -= 0x3e;
  64        return addr + num_regs + delta/0x3f;
  65}
  66
  67#endif /* _ASM_IA64_RSE_H */
  68