root/include/asm-sparc/mpmbox.h

/* */

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

/* */