arch/powerpc/include/asm/dbell.h

   1 /*
   2  * Copyright 2009 Freescale Semicondutor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  *
   9  * provides masks and opcode images for use by code generation, emulation
  10  * and for instructions that older assemblers might not know about
  11  */
  12 #ifndef _ASM_POWERPC_DBELL_H
  13 #define _ASM_POWERPC_DBELL_H
  14
  15 #include <linux/smp.h>
  16 #include <linux/threads.h>
  17
  18 #include <asm/ppc-opcode.h>
  19
  20 #define PPC_DBELL_MSG_BRDCAST   (0x04000000)
  21 #define PPC_DBELL_TYPE(x)       (((x) & 0xf) << 28)
  22 enum ppc_dbell {
  23         PPC_DBELL = 0,          /* doorbell */
  24         PPC_DBELL_CRIT = 1,     /* critical doorbell */
  25         PPC_G_DBELL = 2,        /* guest doorbell */
  26         PPC_G_DBELL_CRIT = 3,   /* guest critical doorbell */
  27         PPC_G_DBELL_MC = 4,     /* guest mcheck doorbell */
  28 };
  29
  30 #ifdef CONFIG_SMP
  31 extern unsigned long dbell_smp_message[NR_CPUS];
  32 extern void smp_dbell_message_pass(int target, int msg);
  33 #endif
  34
  35 static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
  36 {
  37         u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
  38                         (tag & 0x07ffffff);
  39
  40         __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
  41 }
  42
  43 #endif /* _ASM_POWERPC_DBELL_H */