arch/sparc/include/asm/mpmbox.h

   1 /*
   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) */