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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));
}
/*
* Calculate the number of registers in the dirty partition starting at BSPSTORE and
* ending at BSP. This isn't simply (BSP-BSPSTORE)/8 because every 64th slot stores
* 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 */