LXR linux/arch/powerpc/include/asm/dbell.h

   1/*
   2 * Copyright 2009 Freescale Semiconductor, 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) << (63-36))
  22#define PPC_DBELL_TYPE_MASK     PPC_DBELL_TYPE(0xf)
  23#define PPC_DBELL_LPID(x)       ((x) << (63 - 49))
  24#define PPC_DBELL_PIR_MASK      0x3fff
  25enum ppc_dbell {
  26        PPC_DBELL = 0,          /* doorbell */
  27        PPC_DBELL_CRIT = 1,     /* critical doorbell */
  28        PPC_G_DBELL = 2,        /* guest doorbell */
  29        PPC_G_DBELL_CRIT = 3,   /* guest critical doorbell */
  30        PPC_G_DBELL_MC = 4,     /* guest mcheck doorbell */
  31        PPC_DBELL_SERVER = 5,   /* doorbell on server */
  32};
  33
  34#ifdef CONFIG_PPC_BOOK3S
  35
  36#define PPC_DBELL_MSGTYPE               PPC_DBELL_SERVER
  37#define SPRN_DOORBELL_CPUTAG            SPRN_TIR
  38#define PPC_DBELL_TAG_MASK              0x7f
  39
  40static inline void _ppc_msgsnd(u32 msg)
  41{
  42        if (cpu_has_feature(CPU_FTR_HVMODE))
  43                __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
  44        else
  45                __asm__ __volatile__ (PPC_MSGSNDP(%0) : : "r" (msg));
  46}
  47
  48#else /* CONFIG_PPC_BOOK3S */
  49
  50#define PPC_DBELL_MSGTYPE               PPC_DBELL
  51#define SPRN_DOORBELL_CPUTAG            SPRN_PIR
  52#define PPC_DBELL_TAG_MASK              0x3fff
  53
  54static inline void _ppc_msgsnd(u32 msg)
  55{
  56        __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
  57}
  58
  59#endif /* CONFIG_PPC_BOOK3S */
  60
  61extern void doorbell_cause_ipi(int cpu, unsigned long data);
  62extern void doorbell_exception(struct pt_regs *regs);
  63extern void doorbell_setup_this_cpu(void);
  64
  65static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
  66{
  67        u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
  68                        (tag & 0x07ffffff);
  69
  70        _ppc_msgsnd(msg);
  71}
  72
  73#endif /* _ASM_POWERPC_DBELL_H */
  74