1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
7 */
8#ifndef _ASM_IA64_SN_PDA_H
9#define _ASM_IA64_SN_PDA_H
10
11#include <linux/cache.h>
12#include <asm/percpu.h>
13#include <asm/system.h>
14
15
16/*
17 * CPU-specific data structure.
18 *
19 * One of these structures is allocated for each cpu of a NUMA system.
20 *
21 * This structure provides a convenient way of keeping together
22 * all SN per-cpu data structures.
23 */
24
25typedef struct pda_s {
26
27	/*
28	 * Support for SN LEDs
29	 */
30	volatile short	*led_address;
31	u8		led_state;
32	u8		hb_state;	/* supports blinking heartbeat leds */
33	unsigned int	hb_count;
34
35	unsigned int	idle_flag;
36
37	volatile unsigned long *bedrock_rev_id;
38	volatile unsigned long *pio_write_status_addr;
39	unsigned long pio_write_status_val;
40	volatile unsigned long *pio_shub_war_cam_addr;
41
42	unsigned long	sn_in_service_ivecs[4];
43	int		sn_lb_int_war_ticks;
44	int		sn_last_irq;
45	int		sn_first_irq;
46} pda_t;
47
48
49#define CACHE_ALIGN(x)	(((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
50
51/*
52 * PDA
53 * Per-cpu private data area for each cpu. The PDA is located immediately after
54 * the IA64 cpu_data area. A full page is allocated for the cp_data area for each
55 * cpu but only a small amout of the page is actually used. We put the SNIA PDA
56 * in the same page as the cpu_data area. Note that there is a check in the setup
57 * code to verify that we don't overflow the page.
58 *
59 * Seems like we should should cache-line align the pda so that any changes in the
60 * size of the cpu_data area don't change cache layout. Should we align to 32, 64, 128
61 * or 512 boundary. Each has merits. For now, pick 128 but should be revisited later.
62 */
63DECLARE_PER_CPU(struct pda_s, pda_percpu);
64
65#define pda		(&__ia64_per_cpu_var(pda_percpu))
66
67#define pdacpu(cpu)	(&per_cpu(pda_percpu, cpu))
68
69#endif /* _ASM_IA64_SN_PDA_H */
70