mpmbox.h
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- /* $Id: mpmbox.h,v 1.4 1996/04/25 06:13:19 davem Exp $
- * mpmbox.h: Interface and defines for the OpenProm mailbox
- * facilities for MP machines under Linux.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
- #ifndef _SPARC_MPMBOX_H
- #define _SPARC_MPMBOX_H
- /* The prom allocates, for each CPU on the machine an unsigned
- * byte in physical ram. You probe the device tree prom nodes
- * for these values. The purpose of this byte is to be able to
- * pass messages from one cpu to another.
- */
- /* These are the main message types we have to look for in our
- * Cpu mailboxes, based upon these values we decide what course
- * of action to take.
- */
- /* The CPU is executing code in the kernel. */
- #define MAILBOX_ISRUNNING 0xf0
- /* Another CPU called romvec->pv_exit(), you should call
- * prom_stopcpu() when you see this in your mailbox.
- */
- #define MAILBOX_EXIT 0xfb
- /* Another CPU called romvec->pv_enter(), you should call
- * prom_cpuidle() when this is seen.
- */
- #define MAILBOX_GOSPIN 0xfc
- /* Another CPU has hit a breakpoint either into kadb or the prom
- * itself. Just like MAILBOX_GOSPIN, you should call prom_cpuidle()
- * at this point.
- */
- #define MAILBOX_BPT_SPIN 0xfd
- /* Oh geese, some other nitwit got a damn watchdog reset. The party's
- * over so go call prom_stopcpu().
- */
- #define MAILBOX_WDOG_STOP 0xfe
- #ifndef __ASSEMBLY__
- /* Handy macro's to determine a cpu's state. */
- /* Is the cpu still in Power On Self Test? */
- #define MBOX_POST_P(letter) ((letter) >= 0x00 && (letter) <= 0x7f)
- /* Is the cpu at the 'ok' prompt of the PROM? */
- #define MBOX_PROMPROMPT_P(letter) ((letter) >= 0x80 && (letter) <= 0x8f)
- /* Is the cpu spinning in the PROM? */
- #define MBOX_PROMSPIN_P(letter) ((letter) >= 0x90 && (letter) <= 0xef)
- /* Sanity check... This is junk mail, throw it out. */
- #define MBOX_BOGON_P(letter) ((letter) >= 0xf1 && (letter) <= 0xfa)
- /* Is the cpu actively running an application/kernel-code? */
- #define MBOX_RUNNING_P(letter) ((letter) == MAILBOX_ISRUNNING)
- #endif /* !(__ASSEMBLY__) */
- #endif /* !(_SPARC_MPMBOX_H) */