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
15static __inline__ unsigned long
16ia64_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 */
24static __inline__ unsigned long
25ia64_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 */
34static __inline__ unsigned long *
35ia64_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 */
45static __inline__ unsigned long
46ia64_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 */
57static __inline__ unsigned long *
58ia64_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 */
68