/* smp.h: Sparc specific SMP stuff.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */

#ifndef _SPARC_SMP_H
#define _SPARC_SMP_H

#include <linux/threads.h>
#include <asm/head.h>
#include <asm/btfixup.h>

#ifndef __ASSEMBLY__

#include <linux/cpumask.h>

#endif /* __ASSEMBLY__ */

#ifdef CONFIG_SMP

#ifndef __ASSEMBLY__

#include <asm/ptrace.h>
#include <asm/asi.h>
#include <asm/atomic.h>

/*
 *      Private routines/data
 */

extern unsigned char boot_cpu_id;
extern volatile unsigned long cpu_callin_map[NR_CPUS];
extern cpumask_t smp_commenced_mask;
extern struct linux_prom_registers smp_penguin_ctable;

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

void cpu_panic(void);
extern void smp4m_irq_rotate(int cpu);

/*
 *      General functions that each host system must provide.
 */

void sun4m_init_smp(void);
void sun4d_init_smp(void);

void smp_callin(void);
void smp_boot_cpus(void);
void smp_store_cpu_info(int);

struct seq_file;
void smp_bogo(struct seq_file *);
void smp_info(struct seq_file *);

BTFIXUPDEF_CALL(void, smp_cross_call, smpfunc_t, cpumask_t, unsigned long, unsigned long, unsigned long, unsigned long)
BTFIXUPDEF_CALL(int, __hard_smp_processor_id, void)
BTFIXUPDEF_BLACKBOX(hard_smp_processor_id)
BTFIXUPDEF_BLACKBOX(load_current)

#define smp_cross_call(func,mask,arg1,arg2,arg3,arg4) BTFIXUP_CALL(smp_cross_call)(func,mask,arg1,arg2,arg3,arg4)

static inline void xc0(smpfunc_t func) { smp_cross_call(func, cpu_online_map, 0, 0, 0, 0); }
static inline void xc1(smpfunc_t func, unsigned long arg1)
{ smp_cross_call(func, cpu_online_map, arg1, 0, 0, 0); }
static inline void xc2(smpfunc_t func, unsigned long arg1, unsigned long arg2)
{ smp_cross_call(func, cpu_online_map, arg1, arg2, 0, 0); }
static inline void xc3(smpfunc_t func, unsigned long arg1, unsigned long arg2,
                           unsigned long arg3)
{ smp_cross_call(func, cpu_online_map, arg1, arg2, arg3, 0); }
static inline void xc4(smpfunc_t func, unsigned long arg1, unsigned long arg2,
                           unsigned long arg3, unsigned long arg4)
{ smp_cross_call(func, cpu_online_map, arg1, arg2, arg3, arg4); }

static inline int smp_call_function(void (*func)(void *info), void *info, int wait)
{
        xc1((smpfunc_t)func, (unsigned long)info);
        return 0;
}

static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
                                           void *info, int wait)
{
        smp_cross_call((smpfunc_t)func, cpumask_of_cpu(cpuid),
                       (unsigned long) info, 0, 0, 0);
        return 0;
}

static inline int cpu_logical_map(int cpu)
{
        return cpu;
}

static inline int hard_smp4m_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;
}

static inline int hard_smp4d_processor_id(void)
{
        int cpuid;

        __asm__ __volatile__("lda [%%g0] %1, %0\n\t" :
                             "=&r" (cpuid) : "i" (ASI_M_VIKING_TMP1));
        return cpuid;
}

extern inline int hard_smpleon_processor_id(void)
{
        int cpuid;
        __asm__ __volatile__("rd     %%asr17,%0\n\t"
                             "srl    %0,28,%0" :
                             "=&r" (cpuid) : );
        return cpuid;
}

#ifndef MODULE
static inline int hard_smp_processor_id(void)
{
        int cpuid;

        /* Black box - sun4m
                __asm__ __volatile__("rd %%tbr, %0\n\t"
                                     "srl %0, 12, %0\n\t"
                                     "and %0, 3, %0\n\t" :
                                     "=&r" (cpuid));
                     - sun4d
                __asm__ __volatile__("lda [%g0] ASI_M_VIKING_TMP1, %0\n\t"
                                     "nop; nop" :
                                     "=&r" (cpuid));
           See btfixup.h and btfixupprep.c to understand how a blackbox works.
         */
        __asm__ __volatile__("sethi %%hi(___b_hard_smp_processor_id), %0\n\t"
                             "sethi %%hi(boot_cpu_id), %0\n\t"
                             "ldub [%0 + %%lo(boot_cpu_id)], %0\n\t" :
                             "=&r" (cpuid));
        return cpuid;
}
#else
static inline int hard_smp_processor_id(void)
{
        int cpuid;

        __asm__ __volatile__("mov %%o7, %%g1\n\t"
                             "call ___f___hard_smp_processor_id\n\t"
                             " nop\n\t"
                             "mov %%g2, %0\n\t" : "=r"(cpuid) : : "g1", "g2");
        return cpuid;
}
#endif

#define raw_smp_processor_id()          (current_thread_info()->cpu)

#define prof_multiplier(__cpu)          cpu_data(__cpu).multiplier
#define prof_counter(__cpu)             cpu_data(__cpu).counter

void smp_setup_cpu_possible_map(void);

#endif /* !(__ASSEMBLY__) */

/* Sparc specific messages. */
#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

#else /* SMP */

#define hard_smp_processor_id()         0
#define smp_setup_cpu_possible_map() do { } while (0)

#endif /* !(SMP) */
#endif /* !(_SPARC_SMP_H) */