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
ia64_rse_slot_num(unsigned long * addr)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
ia64_rse_is_rnat_slot(unsigned long * addr)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 *
ia64_rse_rnat_addr(unsigned long * slot_addr)34 ia64_rse_rnat_addr (unsigned long *slot_addr)
35 {
36 	return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
37 }
38 
39 /*
40  * Calcuate the number of registers in the dirty partition starting at
41  * BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY
42  * divided by eight because the 64th slot is used to store ar.rnat.
43  */
44 static __inline__ unsigned long
ia64_rse_num_regs(unsigned long * bspstore,unsigned long * bsp)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 *
ia64_rse_skip_regs(unsigned long * addr,long num_regs)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 */
67