xref: /openbmc/linux/arch/powerpc/include/asm/dbell.h (revision 4800cd83)
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 extern void doorbell_message_pass(int target, int msg);
31 extern void doorbell_exception(struct pt_regs *regs);
32 extern void doorbell_check_self(void);
33 extern void doorbell_setup_this_cpu(void);
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 */
44