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dbell.h
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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) << (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
25 enum 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 };
32 
33 extern void doorbell_cause_ipi(int cpu, unsigned long data);
34 extern void doorbell_exception(struct pt_regs *regs);
35 extern void doorbell_setup_this_cpu(void);
36 
37 static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
38 {
39  u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
40  (tag & 0x07ffffff);
41 
42  __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
43 }
44 
45 #endif /* _ASM_POWERPC_DBELL_H */