| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $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) */ |