1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * PROM library initialisation code.
7  *
8  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
9  */
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 
13 #include <asm/bootinfo.h>
14 #include <asm/sgialib.h>
15 #include <asm/smp-ops.h>
16 
17 #undef DEBUG_PROM_INIT
18 
19 /* Master romvec interface. */
20 struct linux_romvec *romvec;
21 
22 #if defined(CONFIG_64BIT) && defined(CONFIG_FW_ARC32)
23 /* stack for calling 32bit ARC prom */
24 u64 o32_stk[4096];
25 #endif
26 
prom_init(void)27 void __init prom_init(void)
28 {
29 	PSYSTEM_PARAMETER_BLOCK pb = PROMBLOCK;
30 
31 	romvec = ROMVECTOR;
32 
33 	if (pb->magic != 0x53435241) {
34 		printk(KERN_CRIT "Aieee, bad prom vector magic %08lx\n",
35 		       (unsigned long) pb->magic);
36 		while(1)
37 			;
38 	}
39 
40 	prom_init_cmdline(fw_arg0, (LONG *)fw_arg1);
41 	prom_identify_arch();
42 	printk(KERN_INFO "PROMLIB: ARC firmware Version %d Revision %d\n",
43 	       pb->ver, pb->rev);
44 	prom_meminit();
45 
46 #ifdef DEBUG_PROM_INIT
47 	pr_info("Press a key to reboot\n");
48 	ArcRead(0, &c, 1, &cnt);
49 	ArcEnterInteractiveMode();
50 #endif
51 }
52