pda.h

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 - 1997, 2000-2005 Silicon Graphics, Inc. All rights reserved.
 */
#ifndef _ASM_IA64_SN_PDA_H
#define _ASM_IA64_SN_PDA_H

#include <linux/cache.h>
#include <asm/percpu.h>


/*
 * CPU-specific data structure.
 *
 * One of these structures is allocated for each cpu of a NUMA system.
 *
 * This structure provides a convenient way of keeping together 
 * all SN per-cpu data structures. 
 */

typedef struct pda_s {

    /*
     * Support for SN LEDs
     */
    volatile short  *led_address;
    u8      led_state;
    u8      hb_state;   /* supports blinking heartbeat leds */
    unsigned int    hb_count;

    unsigned int    idle_flag;
    
    volatile unsigned long *bedrock_rev_id;
    volatile unsigned long *pio_write_status_addr;
    unsigned long pio_write_status_val;
    volatile unsigned long *pio_shub_war_cam_addr;

    unsigned long   sn_in_service_ivecs[4];
    int     sn_lb_int_war_ticks;
    int     sn_last_irq;
    int     sn_first_irq;
} pda_t;


#define CACHE_ALIGN(x)  (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))

/*
 * PDA
 * Per-cpu private data area for each cpu. The PDA is located immediately after
 * the IA64 cpu_data area. A full page is allocated for the cp_data area for each
 * cpu but only a small amout of the page is actually used. We put the SNIA PDA
 * in the same page as the cpu_data area. Note that there is a check in the setup
 * code to verify that we don't overflow the page.
 *
 * Seems like we should should cache-line align the pda so that any changes in the
 * size of the cpu_data area don't change cache layout. Should we align to 32, 64, 128
 * or 512 boundary. Each has merits. For now, pick 128 but should be revisited later.
 */
DECLARE_PER_CPU(struct pda_s, pda_percpu);

#define pda     (&__ia64_per_cpu_var(pda_percpu))

#define pdacpu(cpu) (&per_cpu(pda_percpu, cpu))

#endif /* _ASM_IA64_SN_PDA_H */