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/* smp.h: Sparc specific SMP stuff.

 *

 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)

 */

#ifndef _SPARC_SMP_H

#define _SPARC_SMP_H

#ifndef __ASSEMBLY__

/* PROM provided per-processor information we need

 * to start them all up.

 */

struct prom_cpuinfo {

        int prom_node;

        int mid;

};

#endif /* !(__ASSEMBLY__) */

#ifdef __SMP__

#ifndef __ASSEMBLY__

extern struct prom_cpuinfo linux_cpus[NCPUS];

/* Per processor Sparc parameters we need. */

struct cpuinfo_sparc {

        unsigned long udelay_val; /* that's it */

};

extern struct cpuinfo_sparc cpu_data[NR_CPUS];

typedef volatile unsigned char klock_t;

extern klock_t kernel_flag;

#define KLOCK_HELD       0xff

#define KLOCK_CLEAR      0x00

/*

 *      Private routines/data

 */

extern int smp_found_cpus;

extern unsigned char boot_cpu_id;

extern unsigned long cpu_present_map;

extern volatile unsigned long smp_invalidate_needed[NR_CPUS];

extern volatile unsigned long kernel_counter;

extern volatile unsigned char active_kernel_processor;

extern void smp_message_irq(void);

extern unsigned long ipi_count;

extern volatile unsigned long kernel_counter;

extern volatile unsigned long syscall_count;

extern void print_lock_state(void);

typedef void (*smpfunc_t)(unsigned long, unsigned long, unsigned long,

                       unsigned long, unsigned long);

/*

 *      General functions that each host system must provide.

 */

extern void smp_callin(void);

extern void smp_boot_cpus(void);

extern void smp_store_cpu_info(int id);

extern void smp_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,

                           unsigned long arg3, unsigned long arg4, unsigned long arg5);

extern void smp_capture(void);

extern void smp_release(void);

extern inline void xc0(smpfunc_t func) { smp_cross_call(func, 0, 0, 0, 0, 0); }

extern inline void xc1(smpfunc_t func, unsigned long arg1)

{ smp_cross_call(func, arg1, 0, 0, 0, 0); }

extern inline void xc2(smpfunc_t func, unsigned long arg1, unsigned long arg2)

{ smp_cross_call(func, arg1, arg2, 0, 0, 0); }

extern inline void xc3(smpfunc_t func, unsigned long arg1, unsigned long arg2,

                       unsigned long arg3)

{ smp_cross_call(func, arg1, arg2, arg3, 0, 0); }

extern inline void xc4(smpfunc_t func, unsigned long arg1, unsigned long arg2,

                       unsigned long arg3, unsigned long arg4)

{ smp_cross_call(func, arg1, arg2, arg3, arg4, 0); }

extern inline void xc5(smpfunc_t func, unsigned long arg1, unsigned long arg2,

                       unsigned long arg3, unsigned long arg4, unsigned long arg5)

{ smp_cross_call(func, arg1, arg2, arg3, arg4, arg5); }

extern volatile int cpu_number_map[NR_CPUS];

extern volatile int cpu_logical_map[NR_CPUS];

extern __inline int smp_processor_id(void)

{

        int cpuid;

        __asm__ __volatile__("rd %%tbr, %0\n\t"

                             "srl %0, 12, %0\n\t"

                             "and %0, 3, %0\n\t" :

                             "=&r" (cpuid));

        return cpuid;

}

extern volatile unsigned long smp_proc_in_lock[NR_CPUS]; /* for computing process time */

extern volatile int smp_process_available;

extern inline int smp_swap(volatile int *addr, int value)

{

        __asm__ __volatile__("swap [%2], %0\n\t" :

                             "=&r" (value) :

                             "0" (value), "r" (addr));

        return value;

}

extern inline volatile void inc_smp_counter(volatile int *ctr)

{

        int tmp;

        while((tmp = smp_swap(ctr, -1)) == -1)

                ;

        smp_swap(ctr, (tmp + 1));

}

extern inline volatile void dec_smp_counter(volatile int *ctr)

{

        int tmp;

        while((tmp = smp_swap(ctr, -1)) == -1)

                ;

        smp_swap(ctr, (tmp - 1));

}

extern inline volatile int read_smp_counter(volatile int *ctr)

{

        int value;

        while((value = *ctr) == -1)

                ;

        return value;

}

#endif /* !(__ASSEMBLY__) */

/* Sparc specific messages. */

#define MSG_CAPTURE            0x0004       /* Park a processor. */

#define MSG_CROSS_CALL         0x0005       /* run func on cpus */

/* Empirical PROM processor mailbox constants.  If the per-cpu mailbox

 * contains something other than one of these then the ipi is from

 * Linux's active_kernel_processor.  This facility exists so that

 * the boot monitor can capture all the other cpus when one catches

 * a watchdog reset or the user enters the monitor using L1-A keys.

 */

#define MBOX_STOPCPU          0xFB

#define MBOX_IDLECPU          0xFC

#define MBOX_IDLECPU2         0xFD

#define MBOX_STOPCPU2         0xFE

#define NO_PROC_ID            0xFF

#define PROC_CHANGE_PENALTY     20

#define SMP_FROM_INT            1

#define SMP_FROM_SYSCALL        2

#endif /* !(__SMP__) */

#endif /* !(_SPARC_SMP_H) */