[mirror_ubuntu-bionic-kernel.git] / arch / ia64 / include / asm / rse.h

#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 */
Commit	Line	Data
1da177e4 LT	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 */