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