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
  15 static __inline__ unsigned long
  16 ia64_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  */
  24 static __inline__ unsigned long
  25 ia64_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  */
  34 static __inline__ unsigned long *
  35 ia64_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  */
  45 static __inline__ unsigned long
  46 ia64_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  */
  57 static __inline__ unsigned long *
  58 ia64_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 */