p1275.c

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/*
 * p1275.c: Sun IEEE 1275 PROM low level interface routines
 *
 * Copyright (C) 1996,1997 Jakub Jelinek ([email protected])
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/spinlock.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/spitfire.h>
#include <asm/pstate.h>
#include <asm/ldc.h>

struct {
    long prom_callback;         /* 0x00 */
    void (*prom_cif_handler)(long *);   /* 0x08 */
    unsigned long prom_cif_stack;       /* 0x10 */
} p1275buf;

extern void prom_world(int);

extern void prom_cif_direct(unsigned long *args);
extern void prom_cif_callback(void);

/*
 * This provides SMP safety on the p1275buf.
 */
DEFINE_RAW_SPINLOCK(prom_entry_lock);

void p1275_cmd_direct(unsigned long *args)
{
    unsigned long flags;

    raw_local_save_flags(flags);
    raw_local_irq_restore((unsigned long)PIL_NMI);
    raw_spin_lock(&prom_entry_lock);

    prom_world(1);
    prom_cif_direct(args);
    prom_world(0);

    raw_spin_unlock(&prom_entry_lock);
    raw_local_irq_restore(flags);
}

void prom_cif_init(void *cif_handler, void *cif_stack)
{
    p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
    p1275buf.prom_cif_stack = (unsigned long)cif_stack;
}