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 
21 struct {
22 	long prom_callback;			/* 0x00 */
23 	void (*prom_cif_handler)(long *);	/* 0x08 */
24 	unsigned long prom_cif_stack;		/* 0x10 */
25 } p1275buf;
26 
27 extern void prom_world(int);
28 
29 extern void prom_cif_direct(unsigned long *args);
30 extern void prom_cif_callback(void);
31 
32 /*
33  * This provides SMP safety on the p1275buf.
34  */
35 DEFINE_RAW_SPINLOCK(prom_entry_lock);
36 
p1275_cmd_direct(unsigned long * args)37 void p1275_cmd_direct(unsigned long *args)
38 {
39 	unsigned long flags;
40 
41 	raw_local_save_flags(flags);
42 	raw_local_irq_restore((unsigned long)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 
prom_cif_init(void * cif_handler,void * cif_stack)53 void 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