1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * p1275.c: Sun IEEE 1275 PROM low level interface routines 4 * 5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/sched.h> 10 #include <linux/smp.h> 11 #include <linux/string.h> 12 #include <linux/spinlock.h> 13 #include <linux/irqflags.h> 14 15 #include <asm/openprom.h> 16 #include <asm/oplib.h> 17 #include <asm/spitfire.h> 18 #include <asm/pstate.h> 19 #include <asm/ldc.h> 20 21 struct { 22 long prom_callback; /* 0x00 */ 23 void (*prom_cif_handler)(long *); /* 0x08 */ 24 } p1275buf; 25 26 extern void prom_world(int); 27 28 extern void prom_cif_direct(unsigned long *args); 29 extern void prom_cif_callback(void); 30 31 /* 32 * This provides SMP safety on the p1275buf. 33 */ 34 DEFINE_RAW_SPINLOCK(prom_entry_lock); 35 36 void p1275_cmd_direct(unsigned long *args) 37 { 38 unsigned long flags; 39 40 local_save_flags(flags); 41 local_irq_restore((unsigned long)PIL_NMI); 42 raw_spin_lock(&prom_entry_lock); 43 44 prom_world(1); 45 prom_cif_direct(args); 46 prom_world(0); 47 48 raw_spin_unlock(&prom_entry_lock); 49 local_irq_restore(flags); 50 } 51 52 void prom_cif_init(void *cif_handler) 53 { 54 p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; 55 } 56