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#ifndef _ASM_IA64_RSE_H

#define _ASM_IA64_RSE_H

/*

 * Copyright (C) 1998, 1999 Hewlett-Packard Co

 * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>

 *

 * Register stack engine related helper functions.  This file may be

 * used in applications, so be careful about the name-space and give

 * some consideration to non-GNU C compilers (though __inline__ is

 * fine).

 */

static __inline__ unsigned long

ia64_rse_slot_num (unsigned long *addr)

{

        return (((unsigned long) addr) >> 3) & 0x3f;

}

/*

 * Return TRUE if ADDR is the address of an RNAT slot.

 */

static __inline__ unsigned long

ia64_rse_is_rnat_slot (unsigned long *addr)

{

        return ia64_rse_slot_num(addr) == 0x3f;

}

/*

 * Returns the address of the RNAT slot that covers the slot at

 * address SLOT_ADDR.

 */

static __inline__ unsigned long *

ia64_rse_rnat_addr (unsigned long *slot_addr)

{

        return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));

}

/*

 * Calcuate the number of registers in the dirty partition starting at

 * BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY

 * divided by eight because the 64th slot is used to store ar.rnat.

 */

static __inline__ unsigned long

ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)

{

        unsigned long slots = (bsp - bspstore);

        return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;

}

/*

 * The inverse of the above: given bspstore and the number of

 * registers, calculate ar.bsp.

 */

static __inline__ unsigned long *

ia64_rse_skip_regs (unsigned long *addr, long num_regs)

{

        long delta = ia64_rse_slot_num(addr) + num_regs;

        if (num_regs < 0)

                delta -= 0x3e;

        return addr + num_regs + delta/0x3f;

}

#endif /* _ASM_IA64_RSE_H */