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
  14 static __inline__ unsigned long
  15 ia64_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  */
  23 static __inline__ unsigned long
  24 ia64_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  */
  33 static __inline__ unsigned long *
  34 ia64_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  */
  44 static __inline__ unsigned long
  45 ia64_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  */
  56 static __inline__ unsigned long *
  57 ia64_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 */