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/sched.h> 9 #include <linux/smp.h> 10 #include <linux/string.h> 11 #include <linux/spinlock.h> 12 #include <linux/irqflags.h> 13 14 #include <asm/openprom.h> 15 #include <asm/oplib.h> 16 #include <asm/spitfire.h> 17 #include <asm/pstate.h> 18 #include <asm/ldc.h> 19 20 struct { 21 long prom_callback; /* 0x00 */ 22 void (*prom_cif_handler)(long *); /* 0x08 */ 23 } p1275buf; 24 25 extern void prom_world(int); 26 27 extern void prom_cif_direct(unsigned long *args); 28 extern void prom_cif_callback(void); 29 30 /* 31 * This provides SMP safety on the p1275buf. 32 */ 33 DEFINE_RAW_SPINLOCK(prom_entry_lock); 34 35 void p1275_cmd_direct(unsigned long *args) 36 { 37 unsigned long flags; 38 39 local_save_flags(flags); 40 local_irq_restore((unsigned long)PIL_NMI); 41 raw_spin_lock(&prom_entry_lock); 42 43 prom_world(1); 44 prom_cif_direct(args); 45 prom_world(0); 46 47 raw_spin_unlock(&prom_entry_lock); 48 local_irq_restore(flags); 49 } 50 51 void prom_cif_init(void *cif_handler, void *cif_stack) 52 { 53 p1275buf.prom_cif_handler = (void (*)(long *))cif_handler; 54 } 55