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pda.h
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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 
14 
15 /*
16  * CPU-specific data structure.
17  *
18  * One of these structures is allocated for each cpu of a NUMA system.
19  *
20  * This structure provides a convenient way of keeping together
21  * all SN per-cpu data structures.
22  */
23 
24 typedef struct pda_s {
25 
26  /*
27  * Support for SN LEDs
28  */
29  volatile short *led_address;
31  u8 hb_state; /* supports blinking heartbeat leds */
32  unsigned int hb_count;
33 
34  unsigned int idle_flag;
35 
36  volatile unsigned long *bedrock_rev_id;
37  volatile unsigned long *pio_write_status_addr;
38  unsigned long pio_write_status_val;
39  volatile unsigned long *pio_shub_war_cam_addr;
40 
41  unsigned long sn_in_service_ivecs[4];
45 } pda_t;
46 
47 
48 #define CACHE_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
49 
50 /*
51  * PDA
52  * Per-cpu private data area for each cpu. The PDA is located immediately after
53  * the IA64 cpu_data area. A full page is allocated for the cp_data area for each
54  * cpu but only a small amout of the page is actually used. We put the SNIA PDA
55  * in the same page as the cpu_data area. Note that there is a check in the setup
56  * code to verify that we don't overflow the page.
57  *
58  * Seems like we should should cache-line align the pda so that any changes in the
59  * size of the cpu_data area don't change cache layout. Should we align to 32, 64, 128
60  * or 512 boundary. Each has merits. For now, pick 128 but should be revisited later.
61  */
62 DECLARE_PER_CPU(struct pda_s, pda_percpu);
63 
64 #define pda (&__ia64_per_cpu_var(pda_percpu))
65 
66 #define pdacpu(cpu) (&per_cpu(pda_percpu, cpu))
67 
68 #endif /* _ASM_IA64_SN_PDA_H */