release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/include/asm/sn/pda.h

   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
  25 typedef 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  */
  63 DECLARE_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 */