• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
p1275_cmd_direct(unsigned long * args)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 
prom_cif_init(void * cif_handler,void * cif_stack)51 void prom_cif_init(void *cif_handler, void *cif_stack)
52 {
53 	p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
54 }
55