blob: 02830a3b0196dba7e7f658fc6b23ef55fd4d19d0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
14static __inline__ unsigned long
15ia64_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 */
23static __inline__ unsigned long
24ia64_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 */
33static __inline__ unsigned long *
34ia64_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 */
44static __inline__ unsigned long
45ia64_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 */
56static __inline__ unsigned long *
57ia64_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 */