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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $Id: mpmbox.h,v 1.4 1996/04/25 06:13:19 davem Exp $
2 * mpmbox.h: Interface and defines for the OpenProm mailbox
3 * facilities for MP machines under Linux.
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#ifndef _SPARC_MPMBOX_H
9#define _SPARC_MPMBOX_H
10
11/* The prom allocates, for each CPU on the machine an unsigned
12 * byte in physical ram. You probe the device tree prom nodes
13 * for these values. The purpose of this byte is to be able to
14 * pass messages from one cpu to another.
15 */
16
17/* These are the main message types we have to look for in our
18 * Cpu mailboxes, based upon these values we decide what course
19 * of action to take.
20 */
21
22/* The CPU is executing code in the kernel. */
23#define MAILBOX_ISRUNNING 0xf0
24
25/* Another CPU called romvec->pv_exit(), you should call
26 * prom_stopcpu() when you see this in your mailbox.
27 */
28#define MAILBOX_EXIT 0xfb
29
30/* Another CPU called romvec->pv_enter(), you should call
31 * prom_cpuidle() when this is seen.
32 */
33#define MAILBOX_GOSPIN 0xfc
34
35/* Another CPU has hit a breakpoint either into kadb or the prom
36 * itself. Just like MAILBOX_GOSPIN, you should call prom_cpuidle()
37 * at this point.
38 */
39#define MAILBOX_BPT_SPIN 0xfd
40
41/* Oh geese, some other nitwit got a damn watchdog reset. The party's
42 * over so go call prom_stopcpu().
43 */
44#define MAILBOX_WDOG_STOP 0xfe
45
46#ifndef __ASSEMBLY__
47
48/* Handy macro's to determine a cpu's state. */
49
50/* Is the cpu still in Power On Self Test? */
51#define MBOX_POST_P(letter) ((letter) >= 0x00 && (letter) <= 0x7f)
52
53/* Is the cpu at the 'ok' prompt of the PROM? */
54#define MBOX_PROMPROMPT_P(letter) ((letter) >= 0x80 && (letter) <= 0x8f)
55
56/* Is the cpu spinning in the PROM? */
57#define MBOX_PROMSPIN_P(letter) ((letter) >= 0x90 && (letter) <= 0xef)
58
59/* Sanity check... This is junk mail, throw it out. */
60#define MBOX_BOGON_P(letter) ((letter) >= 0xf1 && (letter) <= 0xfa)
61
62/* Is the cpu actively running an application/kernel-code? */
63#define MBOX_RUNNING_P(letter) ((letter) == MAILBOX_ISRUNNING)
64
65#endif /* !(__ASSEMBLY__) */
66
67#endif /* !(_SPARC_MPMBOX_H) */