1/* 2 * p1275.c: Sun IEEE 1275 PROM low level interface routines 3 * 4 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 5 */ 6 7#include <linux/kernel.h> 8#include <linux/init.h> 9#include <linux/sched.h> 10#include <linux/smp.h> 11#include <linux/string.h> 12#include <linux/spinlock.h> 13 14#include <asm/openprom.h> 15#include <asm/oplib.h> 16#include <asm/system.h> 17#include <asm/spitfire.h> 18#include <asm/pstate.h> 19#include <asm/ldc.h> 20 21struct { 22 long prom_callback; /* 0x00 */ 23 void (*prom_cif_handler)(long *); /* 0x08 */ 24 unsigned long prom_cif_stack; /* 0x10 */ 25} p1275buf; 26 27extern void prom_world(int); 28 29extern void prom_cif_direct(unsigned long *args); 30extern void prom_cif_callback(void); 31 32/* 33 * This provides SMP safety on the p1275buf. 34 */ 35DEFINE_RAW_SPINLOCK(prom_entry_lock); 36 37void p1275_cmd_direct(unsigned long *args) 38{ 39 unsigned long flags; 40 41 raw_local_save_flags(flags); 42 raw_local_irq_restore(PIL_NMI); 43 raw_spin_lock(&prom_entry_lock); 44 45 prom_world(1); 46 prom_cif_direct(args); 47 prom_world(0); 48 49 raw_spin_unlock(&prom_entry_lock); 50 raw_local_irq_restore(flags); 51} 52 53void prom_cif_init(void *cif_handler, void *cif_stack) 54{ 55 p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; 56 p1275buf.prom_cif_stack = (unsigned long)cif_stack; 57} 58